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HomeMy WebLinkAbout1.06 Supporting Documents303 North Avenue Grand Junction, CO 81501 970 -244 -870; fax 870-243 -2681 Encana North Compressor Project Geotechnical Study November 12, 2004 introduction Eaith Engineers .Inc. was contracted by Enserca Engineering LLC to provide geolechnical information for the construction of a natural gas compression facility. The proposed natural gas compression facility is to be owned and operated by Encana Oil & Gas Inc. Location The proposed facility is located in the southwest of Section 30, Township 5 south, Range 95 west (Figure 1). The nearest town is Parachute, Colorado. From Parachute the site is eleven miles to the north on Garfield County Road 215. County Road 215 lays to the east of Parachute Creek. The site lies to the north of East Fork of Parachute Creek which flows into Parachute Creek nearby. The site was previously occupied by a Unocal Oil Company facility_ Remnants of foundations, storm sewers, utilities, and process facility equipment are presently on the site. Topography The site sets at 5800 feet above sea level. Mesas rise all around this area. The nearest mesa is adjacent to this location to the north. Its elevation is nearly 8100 feet above sea level. The slope of this mesa, running into the site, is steep. Slopes ranging from vertical walls to thirty- degree slopes are found. At the bottom of this slope the gr ade is more moderate. Here, at the toe of this slope, the site has been leveled. The slope of site itself runs gently to the south and more steeply to the west. Drainano The principal drainage is the East Fork of Parachute Creek. The hydraulic length of its drainage basin is more than 13 miles. At the site it flows principally east to west`. The height of the 100-year flood is unknown but should be investigated for construction purposes. Storm flow at the site will come from the east from the East Fork of Parachute Creek and, to a lesser extent, off the slope of the mesa to the north. Both of these drainages should be considered when designing the site. Drainage on site presently flows gently to 11w south and_re_steeply to-the west. Vegetation The creek area is heavily covered in trees, bushes, and grasses. The slope of the mesa is sparsely vegetated and is susceptible to erosion. This study found evidence that in the past large quantities of the adjacent slope's sediments have washed into the local area. Sediment control should be considered when designing site drainage. The site itself is overgrown in grass, bushes, and a few small trees. There are however a few large cottonwood trees that will probably be removed for site construction. The surveyors of this site were locating large trees as well as other useful information. Geotechnical Ex lr�r #ion Six boreholes were drilled on site with a CME 75 on October 28, 2004 (Figure 2). A six-inch hollow stern auger was used. The weather was cold. It rained in the morning and early afternoon. The rain turned into snow by late afternoon. Some soil samples may have slightly less actual moisture contents than was tested due to the inclimate conditions. Borehole numbers one through five were drilled to twenty feet below grade while borehole #6 was drilled to thirty feet below grade. The logs for these boreholes are found in the Appendix. The elevations of the boreholes were measured by the surveyors as follows: Borehole #1 Borehole #2 Borehole #3 Borehole #4 Borehole #5 Borehole #6 5861' SL 5809' SL 5814' SL 5809' SL (5805') 5808' SL 5814' SL Borehole #4's elevation was changed due to the drilling rig's inability to negotiate that area's muddy conditions. The bore was moved slightly to the west off of the edge of the existing foundation's pad. The change in elevation was estimated as four feet. Surface Geolo9Y The site is covered in recent sediments carried down the slope of the mesa to the north and fluvial deposits from the East Fork of Parachute Creek. In general the gravel size is larger at the surface and in greater quantity at depth. The gravel's angularity spans from angular to subrounded. It tended to be more rounded at depth. The gravels at the surface here are-mottly-strbangutarThe gravels were composed of siltstone, mudstone and shale. Shale was predominate at the surface. The shale samples tested showed to be weathered claystone. The sand fraction was also composed of sittstone, muds/one, and shale. The sand fraction appeared to increase with depth. The sand fraction had softer angularity when compared to the gravels. The fine fraction was silty and clayey. In general it appeared to be more clayey with layers of clay interbedded between the coarser sediment. The standard penetration tests (SPT) were ran mostly at 2.5', 5', 10', 15' and 20' below grade. Some intermediate SPIs were also ran. Samples were taken at most boreholes at these depths. The SPT's blow count indicated that with few exceptions the sediment beneath the site was loose, where the blow count corrected to 60% efficiency ranged from 4 to 10. The blow count refers to the number of times it takes a 140 pound hammer falling 30" to drive a 2.5" 0.D. sampler 12 ". Medium dense (corrected blow count) ranging from 10 to 30 occurred near the surface of the boreholes and the dense material occurred at the bottom of two holes (#i4 and #6) at 5785' SL. Very loose layers existed as follows: Borehole #1 Borehole #2 Borehole #6 * bgl = below ground level 10' bgl* 8' bgl 13' bgl 5' bgl 10' bgl 25' bgl 5706' St. 5802' SL 5794' SL 5809' SL 5804' SL 5789' SL The site sampling and testing appear to indicate that site soils were quickly deposited. Both flood and mudslides can be quickly deposited. The denser material appearing at depth may be a remnant of the main channel or positioned nearby the channel. Therefore one may hypothcrifze that early on the East Fork of Parachute Creek was nearer or under the site, mudslides would occur and wash off the slope of the mesa blocking the creek and pushing it Further to the south. Occasional flooding would erode portions of the mudslide and deposit the sands and gravels carried by the creek. As the creek moved away from the site, more and more fines were deposited. This phase characterized further bank depositions. These processes continued until the sediment is found as it is today. Discussion of Soil Properties A, General Site Characteristics 1. Soil Classifications: The site design soil is found at the surface nearly three feet below grade. Deep soils were considered and tested but not classified since the use of a deep foundation would not be based on classification. The 4 surface soil properties were tested using. AsTm D -2487, as follows: 25% Gravel 62% Sand 13% trines mostly clay Of that sand portion a significant clay fraction exists. The Atterberg limits (ASTM D -4318) were tested on both the sediments retained in the number 2D sieve and number 200 sieve. It was found that the number 20 sieve composed 15% of the sand fraction and that this fraction was weathered claystone. The limits for it are as follows: Plastic Limit w 16% Liquid Limit = 27% Plastic Index = 11% The claystone quickly soften upon introduction of water and was moldable with work. The number 200 sieve fraction was also tested with the following results: Plastic Limit = 20% Liquid Limit = 35% Plastic Index = 15% The number 200 sieve sediment also was moldable upon introduction of water. The 200 sieve held 23% of the sediment. Based on these tests the fine fraction of the sample should be increased by 23% + 11% which is 34 %. Given 12% in the pan there is a total adjusted fine fraction of 46 %. Since nearly 50% is retained on the number 200 sieve and the plastic limit is 15 then the soil has an ASTM designation of SC, a clayey sand with gravel or CL a sandy lean clay with gravel. Again the gravel and sand portion are fragments of shale, siltstone, and rriridstone. These are fairly soft rocks and should not be . compared to the sands and gravels found in the nearby Colorado River which tCome predominately from metamorphic rocks which are at least eight times more indurated than these soft sedimentary rocks, 2. Geologic Hazards: Sediment flows from the slope to the north of the site, unconsolidated subsurface sediments and possible sediment deposits by flash floods from the East Fork of Parachute Creek. These items should be addressed in the design and construction of the facility. 3. Potentially Unstable Slopes: The slope to the west rises more than 2300'. The individual slopes form according to their composition. More indurated siltstonos tend to form vertical slopes whereas the softer more weathering susceptible shales or ctaystones tend to form more moderate slopes ranging from 300 to 800. This slope, to the north. may fail when the soil is saturated. The shales are particularly susceptible to carrying niudflows down steep ravines during heavy rainstorms. 4, Swell Potential: The soil's plastic index (PI) at 3' below grade on borehole #2 was 15. This sample was typical of surface soil. A Pt of 15 represents a soil with low to medium swell potential. All samples tested showed no swell under load when introduced to water. 5. Consolidation Potential: The SPT tests ASTM D -1586 indicates the subsurface soils are loose. The exception is found near the surface where mechanical compaction has taken place and at deeper depths where the more gravelly soils exist. The results of one dimensional consolidation tests (ASTM 2435) also show that the soil samples can be considered unconsolidated. The results of these tests are as follows: Borehole if Depth (ft) Load (psf)* Settlerrierrt ( %) 4 20 V' 5500 10 2 2 W 1500 5 1 11 %' 2000 8 6 15' 4000 7 3 2 W 2000 22 1 3' 2000 8 *psf = pounds per square foot pcf = pounds per cubic foot The settlement noted in borehole #3 is much more than what is expected according to thai mple ow caunf -of_5_1. Therefore the sample may have become unconsolidated during the SPT test or when handling the sample_ It is expected that the settlement of the surface soil will range from 5% to 10% under a 2000 psf load. This amount of settlement is typically unacceptable. 6. Water Table: The soil was dry at surface and became more moist with depth. A free water table was found in borehole #6 and borehole #3. These are the two eastern most boreholes. The water table was found at 20' below grade (5704' SL) on borehole 46 and at 17' below grade or 5797' Sl., on borehole #3. The water table was not encountered no the other four boreholes. It maybe that a paleochannel is positioned nearby borehole ' #3 and #6 and these two boreholes are hydraulically isolated from the other boreholes_ It also maybe that the other boreholes have less permeable soil. The boreholes were not checked one day later to gauge the water table. The water table may be assumed to exist at nearly'5704' Sl_, 7 Corrosivity: All concrete and buried material should be designed to resist corrosion due to local alkaline soil. Concrete is especially susceptible to sulfate corrosion. 8. Rock Outcrops: Rock outcrops are found on the surrounding mesas. No bedrock was found on site to a depth of 30'. Area outcrops are typically shale, siltstone, and mudstone. B. Grading and Excavation Considerations 1. Potential Construction Difficulties: The site slopes down to the west. There is a possibility that fill will be required. Suitable fill material may not be found on site. In the event large quantities of fill are required, the surrounding area should be investigated for a potential source. The current source of "structural fill" is large chunky shale. This could be used for fill at depth when thoroughly mixed with finer material. This fill; is currently being excavated on site. The extent of this fill is unknown. Structural fill for the site will have to be transported to site from a gravel pit operating on the Colorado River Valley. The eastern side of the site is currently used as storage space for pipe and equipment. The western side of the site is occupied by the remnants of Unocal's old facility. On the western side, large concrete pads, tprocess equipment, foundation pads and utilities exist. Some items will be removed but some may be used on site. The concrete pads may be hammered on site and removed for use in erosion control_ They also may be buried in the subsurface away from any foundation. Likewise the existing foundation pads, constructed of shale chunks, may be mixed in with the 7 surface soils_ The geotechnical engineer should be consulted on issues regarding on site till properties and the compaction required. A low water table exists on site. The surface moisture content is low. Therefore no caving is anticipated during expected shallow excavations. 2. Suitability of Native Material for Trench gackfill and Structural Fill: The native material at the surface is classified as a sandy lean clay with gravel or a clayey sand with gravel. This type soil is unsuitable for structural till. The native material is suitable for bedding and backfrll for the appropriate situations. These situations would include gas lines, water lines, and some sower lines. 3. Compaction of Subgrades and Fills: All soil is to be compacted to 95% of the standard proctor A$TM 0 -093. The standard proctor for the site's surface soil tested to be 113 pcf at 12% moisture content. The average dry density of good stnictural fill is approximately 130 pot Retained Earth Pressures 1. Lateral Earth Pressures: The soil is a clayey type with high lateral active pressures. The design lateral load for this soil is GO psf per foot of depth. Design lateral loads consider a flat grade on the retained earth. The design lateral load is based on moist conditions for the specified soils at their optimum density. The lateral active pressure does not consider sloping backfill, surcharges or saturated soil conditions. For relatively rigid walls, as when braced by floors, the design lateral loads should be increased to 100 psf per foot of depth. The retaining structure should not consider passive pressures unless design conditions require use. In that case the typo soil's passive pressure is 210 psf per foot of depth. This value assumes a moist soil at optimum density. 2. Coefficient of Friction to Lateral friction for Movement: The coefficient of the design soil ranges from 0.3 to 1.0 considering wet to moist conditions. 3. Cohesion: The cohesion of the surface soil calculates to be 480 psf.. S 4. Backfill Compaction: The trench and wall backfill compaction should be 90% of ASTM D -698. The compaction should be increased for traffic areas. The amount and extent of such compaction should be considered on a case by case basis. D. Foundations 1. Frost Depth: The base of all foundations shall be as deep or deeper than 36' below grade. 2. Allowable Bearing Pressures: Four different methods of determining allowable bearing pressure for the surface soil were studied. The first method depends on soil classification. The type soil is classified as "SC" or "CL". The presumptive allowable bearing pressure, according to the Uniform Building Code (UBC) is as follows: Type Soil Allowable Bearing Pressure SC 1500 psf CL 1000 psf The Garfield County Building Department uses the UBC. The allowable bearing pressure was also calculated using SPT data„ This data indicated there is a weak and very loose zone at nearly 5' below grade on borehole #6. The extent of this one is unknown but should be considered pervasive. The bearing pressure calculated here was 1140 psf for a continuous footing and 660 psf for a mat footing. This same soil calculated to have a bearing pressure of 1320 psf using Terzaghi's method for a continuous footing. A less conservative method was considered using settlement analysis. A sample from borehole #2 at 2 W below grade was tested using ASTM D- 2435. That sample had a total settlement of 8,4% at a 2500 psf load. It was found that when considering a continuous footing, buried at three foot below grade and over 1' of structural fill, the allowable bearing pressure_is 1660 -psft Given -that another sample at 2 V2' below grade settled 22% at 1500 psf and 7.2% at 1500 psi for yet another sample at 3' below ground level the allowable bearing pressure is less than 1660 using settlement analysis. 9 Given the loose conditions of the subsurface and the significant clay fraction it is recommended that an allowable bearing pressure of 1100 psf is used to design continuous footings, isolated pads, column pads and 660 psf is used to design mat foundations. These values could be increased with further testing using trenches and a shear vane test (ASTM D- 2573). The allowable bearing pressure for structural fill is 2500 psf. Structural fill should be considered to carry the load to the soil at a 38' angle extending outward and downward from the edge of the footing. That extended area, under the footing, shall be considered as the total hearing area onto native soil. Deep foundation soil carrying capacities were also considered. It was found in general the soil was looser than necessary for deep foundations at most of the depths in the boreholes, However, at 5785' SL there appears to be a competent soil. In the event piers are considered a friction (downward and upward) of 750 psf shall be used and an end allowable bearing pressure of 8200 psf. Both values are calculated using site tests. The less dense nature of the soil and decreased clay contact on the wall of the pier contribute to low design values, The end bearing pressure should be neglected in the event of hole caving. Test piers should be constructed and loaded prior to overall use. Settlement could be in excess of requirements. 3. Soil Weights: The soil's bulk densities wore measured and calculated as follows: Borehole # Depth (feet) Bulk Density (pcf) Moisture 1 3` 108 9' 3 2 W 90 10' 2 2 'l' 106 10' 4 20 W 96 10' 1 11 %' 110 23' 6 15' 125 1€3' The bulk density of borehole #3 represents a collapsible condition. Typically soil weights less than 90 pcf show moderate to severe settlement upon wetting and load. The other surface densities probably represent areas where the surface soils have been compacted of roadbase by truck traffic and heavy equipment. This should also be the case 10 for borehole #3 however the recent compaction apparently did not affect the density at that depth. The surface density of the recently compacted road base was also tested. it was measured at both borehole #6 and borehole #3. That data is as follows: BH # Density(pcf) Optimum Density(pcf) % Compaction 3 126 136 93 6 '124 136 92 This compacted roadhase is less than the 95% compaction specified herein. 4. Types of Foundations Costs should be compared between necessary dirt work for surface foundations and drilling piers to more than 30' below grade. The depth of piers would depend on site conditions. The surface foundations will be underlain with compacted structural fill over 1 1/2' foot of compacted earth. Surface foundations include isolated pads, spread footings, column pads and mat foundations. Isolated pads, spread footings and column pads shall be designed using an 1100 psf allowable bearing pressure. The mat foundation shall be designed using 660 psf allowable hearing pressure. These mats should be isolated from other concrete structures to allow free movement. All footings shall be reinforced per design requirements. Stemwalls should be designe f to span 13'. Reber shall be placed at the top and bottom of the sternwall. Compacted earth and structural fill is required under slabs, footings and unsupported sternwalls (grade beams). Deep foundations in the area are typically drilled in place concrete piers. Here the entire footprint of the foundation is excavated and then drilled__on a patf ra_specif €ed by -the structural engineer. The piers shall be designed as follows: Minimum Depth: 3O Minimum Diameter of Piers: 1U inches Minimum Penetration into Bedrock: N/A Minimum Deadload: N/A 11 Maximum End Bearing: NM Downward Friction Pressure: 750 psf Upward Friction Pressure: 750 psf The piers shall not be placed closer than B' apart. The first 5' of the pier shall be neglected when calculating skin friction. The pier setting depth shall be determined by the geotechnical engineer. It is probable that the depth will he approximately 30'. The holes shall be cleaned thoroughly and covered upon drilling to total depth. Concrete, specified by the structural engineer, should be pumped from the bottom of the hole via a hard line stinger or suitable alternate method. The pump flow rate should he sufficient to clean debris from the bottom of the hole and scour the walls. The tops of piers shall not be mushroomed_ Mushrooming may be eliminated by installation of short Nana tubes set to grade. The concrete shall be set in the piers immediately after drilling. A low shrink corrosion resistant concrete is recommended to prevent gaps between the pier and the hole. This allows for maximum attainable pier friction. The grade beam should rest directly over the pier and be attached to same by means of a corrosion resistant steel rod. This will allow the grade beam to move upward (or the per downward). With this system the structure may be easily leveled and repaired in the case of extreme movement. Other deep foundations that may be used are helical piers and piles. 5. Floor Systems: We believe the compacted near - surface • soils and compacted site grading fill can exhibit low movement potential. Some movement must be assumed from an Increase in moisture. A slab -on -grade floor can be used in buildings provided the owner is aware of and accepts risk of potential movement. Driveways, sidewalks and exterior slabs are also constructed as slabs -on- grade. We recommend t - • • • • -c 'tops for construction of slabs -on -grade at this site. These precautions will not prevent movement in the event the underlying soils become wetted but they tend to reduce damage if movement occurs. 1. If a structural fill is required to achieve grade then resulting suhgrade should be scarified, moisture 2 conditioned to within 2 percent of optimum moisture content and the top 8" compacted to at least 95 percent of maximum standard Proctor dry density (ASTM D -690). One foot of compacted native soil should he placed over this compacted soil, structural fill then can be used to moot grade. Structural fill soils should consist of a maximum particle sized of 8- inches, a maximum of 30 percent passing Na. 200 sieve and a maximum liquid limit of 30. Structural fill should be moisture conditioned and compacted in maximum 10 -inch loose lifts as stated above. 2. Slab -on -grade construction should be limited to areas such as building interiors and exterior flatwork. 3. Slab subgrade areas should be scarified, moisture conditioned and compacted as described in this report. 4. Slabs should be separated from exterior walls and interior bearing members with a slip joint which allows for free vertical uaroverrrent of slabs. 5. The use of slab - bearing partitions should be minimized. 6. Understab plumbing should be eliminated where feasible. Where such plumbing is unavoidable, it should be thoroughly pressure tested during construction for leaks and should be provided with flexible couplings_ Gas and water lines leading to slab - supported appliances should be constructed with flexibility. 7. Plumbing and utilities which pass through slabs should be isolated lion] the slabs. Heating and air conditioning systems supported by the slabs should be provided with flexible connections capable of at least 1.5 inches of vertical movement so that slab movement is not transmitted to the duct work. 8. Frequent control joints should be provided to reduce prolairams assoi ted with shrink-agf: and curbing: 1'he American Concrete Institute (ACI) and Portland Cement Association (PCA) recommend a maximum panel size of 8 to 15 feet depending upon concrete thickness and slump, and the maximum aggregate size. We advocate additional control joints 3 feet off and parallel to grade beams and foundation walls. 13 9, Exterior slabs should be designed to function as independent units. Movement of stabs -on -grade should not be transmitted directly to the foundations. 6. Perimeter Drains and Groundwater: All runoff water should be diverted from the building site. Gutters should be used around the perimeter of the roof. The use of v -pans and /or French drains is strongly recommended at each gutter termination. V -pans and like items should transport water away from the building for a minimum of 5' prior to release into soil E. Drainage and Irrigation 1. Permeability: The surface soil permeability ranges from 5 x 104s to 2.5 x 104 crnlsec, 2. Hydrologic Soil Group: The site soil is-a "C" or "D" type soil, which has low infiltration rates when thoroughly wet. Group "C ": Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group "D ": Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a permanent high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These suits have a very slow rate of water transmission. 3. Irrigation Practices: No planting is recommended within 5' of the perimeter of any building. Excessive watering is not recommended in any case and may lead to differential settling of the foundation or concrete flatwork. The best practice is to install a 5' concrete walk Around the perimeter of the structure, sloped 2% to the outside. This method has proven very effective in keeping water away from the foundation thereby preserving its integrity. I4 4. Grades Around Buildings: It is recommended that the grades around buildings are at least 10% for 10' extending from the perimeter of any building. 5. Site Preparation: All organic matter should be gathered and eliminated. This would include all trees, shrubs, and grasses. No organic matter should be introduced into the site's soil All topsoil should be removed and stock piled for later use if required. In the event the topsoil is relatively organic free it may be used for fill. Existing concrete flatwork should be removed and buried under roadways on site or used for erosion control, Existing "structural fill" which is composed of large shale chunks should be thoroughly mixed with soil and use for site fill. Once the site is cut to grade, and before any fill is placed, the soil should be compacted in place with a vibratory roller to 95% of ASTM D-698. All native fill and native fill mix should also be compacted to 95% of ASTM D -698. The top 1' of fill should be 1' of roadbase compacted to 95% of the standard proctor. Lesser compaction may be used in storage areas and less traveled roadway& Building sites shall be excavated to 5' below grade and at least 2' to the outside of footings. The top:6' of soil shall be compacted in place in the excavated area using a vibratory roller_ Then 1' of native soil will be placed pnd compacted in place. Then a minimum of one foot of compacted roadbase will reside onto the compacted earth. Excavation for deep foundations require excavations to 3' below grade and compaction of the top 6" of native soil. This assumes that the grade beam connecting the piers will reside below frost depth. F. Road Design The surface soils have a calculated AASI-ITO group index of 4.4 (Appendix). This group index corresponds to the following soil properties: 15 Soil Support Value - 5.5 R Value (California) - 35 CBR - 7 Modulus of Rupture (MR) - 7500 psi Su.hgrade Modulus (K value) - 100 psifin Extensive road work should consider using actual CBR values for design. The group index should be used only for preliminary design and limited road work. C values for road design are as follows: I tem Coefficient Hot Bituminous Pavement 0.44 Crushed Stone Base 0.14 Compacted Native Soil 0.07 G. Concrete Sulfate concentrations may have a severe effect on concrete which comes into contract with the soils. Type V (sulfate resistant) cement should be used for concrete that comes into contact with the subsoils. Type V cement is not always available locally. Locally available Type I I II modified cement has been used for sirnUor conditions This cement may be substituted for use if Type V is unavailable. H. Borings Lim 1. Six geotechnical bores were drilled on this site as shown on • Figure 2. Rations The content of this report is based on subsurface and surface observations made at the time of the site investigation. The content of this report is also based on laboratory testing and professional literature. Subsurface observations and lab tests results are point -site specific. Subsurface conditions often change in a site both horizontally and vertically. Therefore, depending on the amount of testing and boring performed, the resulting data and interpretation thereof may or may not represent the overall site conditions. No warranty or kepresentation either expressed or implied is included or intended in this report. Due to changes in engineering practices, this report is valid for two years. 1 6 We recommend that a qualified professional read this report and discuss any portion necessary with us in order that the proper design of the structure may be implemented. Minimum design criteria are given herein, it is the designer's responsibility to use the appropriate safety factors. We recommend that geotechnical inspections be performed, once dirtwork commences, to assure quality control and that assumptions made herein are valid. Geotechnicat Investigation ; ,• ed b' _ % y � ' �oo' A 1 il 41, ly `'� 31540 ' # i Chris Steven Russell • • �°; s.� )- 11 -01Ye Colorado Professional G .11,irs ��t� r+.r °er Earth Engineers Inc. l7 Appendix Encana North Compressor Project t.J.11f'eL•�.,.s .n t,x, ArTe.•- r.-: ut.,+ m: a., .iw.:o.r�a..?..,atif,:r.�-5..�.: Figure I Cr' x • .a8 tau :;r �;4s5s761 i :r, u1+ y, t. SIRE +:7 ^JK' you ,SIBS: J +.[FS! .CL5 vt#,, I +Olaf. wl Sint !S6' RF+I„Jn! ENCA A. L {/. C.0.4.41.6.141 U)LG n_Tjr.E vutti Mk%ca�s::sxsT+ .. V rPC+ 7 — rtrtirm11.% 1 n• J Encana North Compressor Project Figure 1 a� -cal,. w....�,.,...... 3:Vl t t U LiJa^S A r +'muu swuv-x • i,oa wthAdr' rs *dui VKTNOKa .rw a�a ltfY1G v... +r :1. w— N 4r 0 a,I 4,r ;Jet 1,f 4.3 1 :253` 7.- -»•-- Tl.0 net!. .,.t G;'Ow.9n*<n 3:1x?+2: , 11.11 Vain) Mi 0*01W M34 1v., 1446.11 1-re "t sy • ttt yyY s� w�- ri 4� AP* 3;! r ail -ttP B ..rte- 11 E". 1 Bareh L., o (1 5 5806 r Po a o_ �oo°oao b°a°oao o o�oio • 5796 + + • • 4 • • + -4 4 • i•r • r + 4 t • * 4`•41 • f - - -- 4 s • • 4 • ♦ 4• • • 41.1 • 4 + • • • }• +1`•�• • • 34/25 • • • 4 # + • 1 • • • • • • 4 • • s • • s •`144 ;4� • }• • • 4 4 • • • • • 7 • • • • • • x/91 8/8 7/8 I,2 ' 1 • • + v +!4 • # p • • • 1 4 786 .+ 4 f ++41- ‘11/5 Borehole #1 LEGEND f 4 4 1 I • • • • Brown to dark brown clayey sand with gravel. Most gravel is angular to subangular ohola with ooma shale chunks. Some gravel concentrations. Moist. light ton fine grained send, silt, and clay. Cloy lenses, Sandy grovel. Moist. Unconsolidated sandy grovel cad cloy lenses. Moist. Light brown sandy gravel. Gravel is sedimentary rack -- shale. mudstone, sittitpne, Subround to ou[ angular. Moist. Drive sample. The symbol 8/8 indicates that it required 8 blows of a 140 lb hammer falling 30 inches to drive a 2.5 inch D.D. sampler 6" and 8 blows to drive the next 6" for u total at 16 blows 12" Per A--1 Borehole Log Nncana North Compressor Project Forth Engine8rs, Inc. 3133 NAhh Arc, C•t7•WO JUficr1 , CO 81504 PHONE 070 244 -15:D3 FAx {9.'o) 243 -2685 5610 voer,r, •aa000 4 �ag O 0000.6 2/4 p0g0ga 6/10 O Ddaao-• 0 0 � no0 0o 0° °a0 0 0 0 Op0 a 0 0° 0,0,0 0, 0 5605 5800_, _ 5795 9/21 8/13 5790 4 0. 4 4 • • 4 4 i•♦ 4'4 • 4 4 .4.4 4 ♦ 4 4 4 • • 44 s a 4 • 4 • 4- • 4 • 4 4. 4 ♦ r. 4 4 • 4+• +•14.4.4 a • • • • • 4 • 4 4 4 4 4 1/3 7/7 Borehole #2 LEGEND • 4 I. 444'4.'1 • ▪ • i Brown to dark brown clayey sand wit ?i grovel, Most gravel is angular to subangulor shale with some shale chunks. Soma gravel concentrotions. Motet. Light tun fine grained sand, silt, and clay. Clay lenses, Sandy gravel. Moist, Unconsolidated sandy gravel and clay lenses. Moist. Light brown sandy gravel. Gravel is sedimentary rock -- shale, rnudstone, sittstons. Subround to subongular. Moist. Drive >sompte, The symbol 9/21 indicates that it required 9 blows of a 140 lb hammer tolling 30 inches to drive a 2.5 inch 0.0, sampler 6' and 21 blows to drive the next 6" for a total of 30 blows per 12". Borehole Log Encana North Compressor Project Earth Engineers, Inc. 30.3 North Ave. 01 o 4UNG11On, Co 01504 PFlONC (970) 2.4,4- 8703 FAX (370) 243w255I 5814 Borehole #3 LEGEND Brown to dank brown clayey and with gravel. Most grovel is angular to subangular shale with some shale chunks. Some grovel concentrations. Moist. Ught tan fine grained sand, silt, and clay. Clay lenses, Sandy grovel. Moist. Unconsolidated sandy gravel and clay lenses. Moist to wet. Drive sample, The symbol 25/28 indicates that it required 25 blows of a 140 lb hammer foiling 30 inches to drive a 2.5 inch O.D. sampler 6` and 25 blows to drive the next 6° for a total of 51 blows lair 12 ". Earth Engineers, inc. 303 North Aro. GRANO JUIICTIO)e, CO 61504 PHONE $,e 244 -•4743 FAX 970 2i.3-f2b81 5$05 V VV J'V VV vvsVVVV V V V V 4.'1.. vvv, V7v4 V VV•SV• PTV 979V V V V V V V 9V V V VT `•800 aaog° 5795 • oogaoa 00000° a 0 O a0U0a0 00a0 0 G0D0 0 574xl .0 -0-000 0 0 0Or3• 6/6 o O Q U _..._ _.� 40-0g0 5/8 23/19 Borehole #4 LE_GENf V 9v VVVV VVV Vyv.5 ,....� * e + s + 5785 ` ` ... .. • 30/40 .i' Minus shale fill. Brown to dark brown clayey sand with grave/. Most grovel is angular to subongular shill° with some shots chunks. Soma gravel concentrations. Moist. Light ton fine grained sand, silt, and clay. Cloy lenses. Sandy grovel. Moist. Unconsolidated sandy gravel and cloy lenses. foist Light brown sandy gravel. Grovel is sedimentary rock -- shale, mudstone, slltstone, Subround to subangulor. Moist, Drive sample. Tha symbol 23/19 indicates that it required 23 blow at 140 lb hammer tolling 30 Inches to drive a 2.5 inch 0.D. sainpfer 6' and 19 blows to drive the next. 6" for a total of 42 blows per 12 ". Borehole Log Ericana North Compressor Project Earth Engineers, Inc 303 North Aye. c ?1f1AD J1t cnoN, co 51504 NINE. (970) 244-00,3 FAX (970 243 -255; 5808 5788 8 /t9 Borehole #5 LEGEND • Brown to dark .brown clayey sand with grave,. Most gravel is angular to subangulor shale with some shale chunks. Some gravel concentrations. Moist. Light tan fine grained sand, silt, and clay. Clay lenses. Sandy grovel. Moist_ Unconsolidated sandy gravel and clay lenses, Moist Drive sample. The symbol 13/14 Indicates that it required 13 blows of a 140 lb hammer falling 30 Inches to drive a 2.5 Inch O.D. sampler 6" and 14 blows to drive the next 6" for a total of 27 blows per 12. ". r. Borehole Log gricanil North Compressor Project Earth Engineers, Inc 303 Niorili Avx. 45419 JJ? CII+ N. CO 51504 PHONE (570) 244. -5703 4.74.% 970) 243 -2455t 5814 V V V V C7 V q 5804 5794 0/3 2/2 3/2 5/7 Top Water Table 0 794 4/16 5788 5784 • • • : • • • • • • •• a a ' • • • • • •• • • • • • • + , • • , +�s + • • a • ♦ • , t • • • • • • • • • • • • • •• • • • • • • • • • • • + e • • • • • + a • • + + •$ , ♦ • + v + • • + • • • • • • • • • • • 1/1 8/42 Borehole #6 LEGEND Rood Bose. Brown to cleric brown cloycy sand with grovel, Most grovel is angular to subongular shale with some shale chunks. Some grovel concentrations. Moist. r 9 a0 tight ton fine grained sand, silt, and cloy. Cloy lenses. a o °3andy gravel. Moist. Unconsolidated sandy gravel and clay lenses. Moist to wet. Light brown sandy grovel, Gravel is sedimentary rock — shale, mudatono, siltstone_ Subround to subarlgutar. Moist to wet. Drive sample. The symbol 8/.3 indivotes that it required 8 blows of a 14) lb hammer falling 30 inchas to drive a 2.5 inch Q.D. sampler fi' and 3 blows to drive the next 6" for a total of 11 blowsr 12'. Borehole Log swsi�r —1 Encana North Col:p.1•tr6ox' Project Earth Engineers, Inc: 303 North Avx. OR N0 .311NC11OH, CO 81504 P1101( (030) 244 --9 ?03 MX on 243 -2681 e s U.S. •TANDARD. SIEVE OPENING IN INCHES U.S. STANDARD ! 6 a 3 2 i'h 1 s Yr Mfr 3 4 SIEVE NUMBERS 6 & 1© 14 t4 20 30 40 SO 70 100 14 200 HYGR0ME `ER l i; 0 i0 8C 50 AO z t [� IMMO 3 i I i ' ` 1111111111M11111111.1.111111=11111MIIIMMIMII IIII 11 1.,1! 1 i 1111M111111‘ I I\ t i 11Tt-r f i I 1 I 60 TO 30 UMIIMINIUNNIIMMINIMmw 1111111010m1111111111111111111111111mmll11.111111110" i i MOM. a0 13 �''' 9 f 1 30 100 :50 10 GRA4N SITE MICE METERS S ...40 sumnim==ammiii GRADATION CURVES 0.1 0.05 I 1 { 0.01 0.005 100 0.00i PER CENT COARSER SNE 3111" 02 CLvr P[. P1 Pt01Ec-r �stcaF.a North Comore sso; Prose Alt'. SW Sec 30 'S 60101.40 NO. 1 5�r, 14�,{1g_o4 U.S. S'ANDARD SIEVE OPESINGIN1NCI-IES ...........-...................----_....-_-....----..._.---, ,...i-.... U.S. STANDARD SIEVE NUMBERS HYDROmETER 6 4 3 2 PA 1 7/4 V2 3i 3 .4 6 8 10 1416 20 30 £0 SO 70 100140 200 • / r 1 Ic 1 ii ii r 71 i T1 " Li ri ti !, 'i t 'Hi i i -F-11' '1 1 i 1 1 -Tr-r i 1 ! , ---,-, . , , , i I ,. . , , --1.--i i. ,I I , [ ii , 1 , , , ,_,____...r......._•;_.; i 1 j Hill II "1 1 1 20 C4'-- Ui • I J 1 500 10o 50 .1 74-M , i 1- 1 •', 4 . : . 10 COIBLES i 0.5 GRAN SIZE ,1/441.1„ImETERS COAISE rim CCSAIZZ SAND Aa.b.:upo. 1 Hn i ----1 1 1 50 JIjj 70 30 0 0,05 0.01 0.005 FLT OR CLAY PER CEN COARSER D1 .hGFIT 100 _ 0.301 GRADATION CURVES KAT Vf% LI FL o 35 20 15 T pito; ttr E cane: Nor-th Compressor Project AtEA• EW Sec 30, T5S, R95W liCiqt Z. 1,4D. 1 D.6.11 11-09 -04 U.S S1hNLARD SIEVE OPENING IN INCHES 1 100 901 80 70 i1.5. STANDARD SiEvE NOmukS a a 3 2 PA i 3A 1ir 3s 3 4 & 8 10 1416 20 30 40 50 73 100 140 200 111 IIIIIIMMLIIIIM111111111111ll 11YDROMETB Ia ! 1 20 1 A Z So:.IllH11111M1.11 40 30 23 N ��l 111 113 , • ; NI 1 1 MMINININININIIIINNIMMENThum1111111 ! 1111111111 10 INIUMUNIUMNINI1 NNIIIIMINNIIIIININNONUNNI S00 I • So COSat>;S Go.Avel. Illll 11 1111.11111KMUMIMINMa I 90 sRA11q SIZE ; Uit mErER" 0.1 0.05 s, ;.3e3 70 120 0.01 0.005 b 1 �0 _DO 1 Cc CENT COARSER 61 19111E SILT OR CLAY es or PL /1 20 1 15 Nk0A T Ezcana North GRADATION CAWS DCSa,rs No. 2 O 11 '11-°OY -04 Pt 30 T5S, 12951.1- Ennerca r-ro,)cet Dote Borjng Bo, Ni, 4' - 71 sample No, Bulk Total wt in gram of sample, W = Wt in grams of material > G No. 4 sieve Sieve Openings Inches 'Millimeters U. S. Standard 6ieve Size or Number Weight Retained in grams Percent Retained. Total Partial Percent Finer by 1eiht 3.00 2.00 1.50 1.00 0,750 O. 00 0. 375 0.250 0.181 3-in. 2-In, 1-1/2-in. 25.4 1-in. 19.1 3/4-in. 0 12,7 1/2-in. 9.52 3/8-in. 6.35 No. 3 4.76 No. 4 140 0.1P 0.094 .0!.079 2.00 0.047 1.19 0.033 0.54 0.02, 0.59 0.0165 0.42 0.0117 0.297 0.0083 0.210 • 0.0059 , 0.1.0 0.0041 0,105 0.0029 0.074 3.3f 2.38 Pan No. 4 No. 8 .15 No. 10 No, 16 No. 20 No, 30 No. 40 No. 50 No. 70 328 34 51 No. 100 No. ih0 Iio, 200 Pan 364) 38 87 13 132 14 Total Weight in grumn 960 vt In eraws prtained on a sieve Partial percent retained - x 100 vt in grams of nample used fora given series of sieves lit-in grams retained on gricTe Total percent retained - a x 10./ total vt in grain of oven-dry sample For an individtml sieve, the percent finer by weieat = percent finer than next Larger sieve percent retained on individual sieve Ressrks 980 = 2 error • a Project Enser6 Boring No. 1 @ 3 -51 Total wt in grams of sample, ANN4SIS 1-5- 1 04 Date_ Sieve Opening& Inc. he 3.00 , Nt in grams of material. > Na. 4 sieve W . - ----- Weight Percent Percent Retained Retained Finer in graaa partial Total by Weight Sample No. Bulk U. S. Standard Sieve Size mfIlimota" or Number 2,00 1.r0 1.00 0. _P15.0D 0.375 0.250 0.187 0.132 0.094 o.oT9 0.047 0.033 0.023 0.0165 1-in. 19.1 3/4-in. 1 2-in. 9.52 3/8.-in. 6.35 No. 3 4.76 No. 4 3.36 2.38 2.00 1.19 0.84 0.59 0.42 0.0117 .0.008 0.210 o.0059 0.149_ O.0041 0.105 o.074 9 98,9 220 Pan No. 6 No. 8 No. 10 No. 16 27.9 29 71 No. 20 No. 30 No ho 316 40 . . No. 50 No. 70 69 3]. No. 100 No. 140 No. 200 140 17.7 Pan 104 13.2 86.7 13.3 Total wight in raze 7$9 wt in grams retained en 4 sieve Partial percent retained , X 100 " tin grOb of aample uned for a given otriea of eleven wt 'in grams retained on a sieve Total percent retained . X w_, total wt in grams of oven-dry sample For an individual sieve, the percent finer by weight = parnent finer than next larger sieve - percent retained on individual sieve Remarks 800g%789 = 21i. error Enserca Project 1)1Eptlf.Y:IT Dat.f- j2.1..L6 704_ Boring No. BN 42 3' - 5 Tote]- wt In w.-ems -4;i1mple, gnmnle No • •_ Bulk Wt iii grewls of material > No. 4 :Aeve Openings ■ Inches Millimoters 3.00 2.00 1.50 1.00 0.750 0„,00 0-375 25.4 0.250 0.V.17 19.1 12.1 9.52 6.35 4.-6 U. 0. Standard Sieve S17.e CT Number 3-in. 2-An. 1-1/2-in. 1-tn. 3/k-in. • 1/2-in. 3/8-in. Ho. 3 vo. 4 Weight Petained In grams Percent Retained Percent Finer by Wight. 7 240 24 0.132 f 3.36 0.094 2.38 0.0T2_ 2.00 0.047 1.19 0.84 0.59 0.033 0.023 0.0165 0.0117 0.42 0.o083 0,00 0.0041 0.0029 0.210 Pan No. 6 No. 3 No. 10 240 No. 16 No. 20 140 N. 30 No. 40 No. 50 Ho. 70 24.8 14.5 0.149 Ho. 100 0.105 No. 140 0,074 Ho. 200 220 22.0 Si 13 Pen 120 12.1 99.4 Total weight in grams 967 wt in grams retained on a sieve Partial percent retained - 100 wt in grama of sample used for a given aeries of sieves Total percent retaine wt in grams retained on a sieve d - X 10.1 total, lit in gxams of oven-dry sample For an individual slave, the percent finer by weight percent finer than next diarger sieve - percent retained on individual sieve Remarks 980 - 13 error P � MUM imam l iii�iit41#■�fitE■ Ei/E lu #lEffl![ i lI6 sI81f!!fi[uItiEl "�»... linknURn lunutllt�n n rlrN�mmumus Mp�lllllMOUIUM Encarta North Cc m � �flI1 l U�lUE�RU IIItwRu E �I 11 i♦ NtlR�Nill unnumalillWlinnumsamo l tN IIIiI tuum g:;I1 th: 3 1•ilw1E IMUIUi UINH MMUUltll IMIBUI ■rEM illal 111 URUIliIUlIUiIUiUn1I■tUi SMW R UIFIRUEIUiIEitlUltla U Sample Description: t UNIUMMAMUSHIMIEUIUMuulti tussommuuniusniminuis to I ;Fi Blow .. ount per 12 ": ;tl;4'; MI UU UUmUlitiliMMEttlEpli N iali i ^;T11 a E11iliutrlEMBEI lUUiilIUt S i initial ivioisture Coate I I , ' IMO U1 Nit luntEl7ilt Nu E 1 ` 'r171 } isisti■i�nl IItinnuu REI s E■ tll RRRIIUU I I T ll l; Final Moisture Conte i EEtl1lUlllllUWiEUEEE 'um ��r ~ ,rl, 1HEi■111{� UtUii(gUM UliNtlM 1Ni USIMuu linulUtttUllllilM �UI i., Bulk Density: 108 p SUNI tlNUTh urine iiiltt SUIll isi lu i eluwulEtltlu ltliw I '' Dry 9 cf EIEUIEIIIHI�plil ■iii ipluutiill lESEiu Eulitt lil 1111En t11MMIli 3, y . USIOUR 1gEmulmallli [USE1MulninitU ..ultillSIIEIR�i■ ■ELT UUiilutrMUMUIiulUUl!� alA�ltnri lii:1R#uIiEEIUUmininal i f,tllt� �r. : -rr r r s .r�. , i UiluUHI UE#E llitl UMUI vg101EiiNIONI 1EM uUUM . k . • s • .. EEIIti.uiEI llliii i][�EliiUiiiliU3EiiI11EI E ■t�N slitliffillU iEtiil■ Wiliiili■Ili ■ ■IUi1I [ i , , , . ■�am [EiJ 11111u iMUILIS fiffnlittninligililil ElIUlil4iIIIMIIIIiIIMI ii�t UMIU Uitii p9it ONIMI I IIU 1111Eii �r ,.t 1p I. E lliuUIIU u ill� 1 #ilM101001111Uii1•111UU 11111ntunillll I�IIIIi■i'kAltlf E■� 1Ea111IMin itiMUS lEgus illu tum uEEUsi II mipt i11tutlll tiJtl 4itl ��r�11ltEnutituust al lu ElIMMIMmin Ut# q itN UM iuml yU EII�1!♦ Unt ;1 U E�Etl iipl� 111 HuraM Uultlllli UMMIN ttllEU NIMMUMKEEIiEI[liiti � ilillfllpii MUMIt EMBHUSUUUMu lowniEE1 i 7 1 Y } n, .,1 if i♦! EEEii ttlil!} EE 11111111# 11 ElIEiEtUIIMlEll I�numuulinuit tiitlllilmo EtEa E ittutlilniEE illllE � t i EifE1p�{t�� li ? T3 anirilill ill 111 r t r IUSE t11/ U nItianuitiiilli iIIEI� ;g11ifi l miiillRitilini til iiif I ■ tl r 1 un ��11U iiitlel tlEliiiiiiltilIi UMUI ■IM U MR r H1 MUOUMM 1 � �Ip r 1. I + I ? �iI�E_[�IM�illi Millititiili£ti m�qy�u UUR®HNI Etiiiiiffi1 W RANI I R II [ ' IEIIIEIlliltlUlliJi�j IU W�RIR EIUUNtIUUUIi�l« EElli;ilTi#liiitll #iEill R■i�#E3 1i111ii1llliIJ11N i a® to .K. •••••• �.walwr�rrr wl1E7111Ei1#111� 4 f Nltltltlli Utiiii U�uulu U1 Ul fl 'g NR� U I US UR iilfilfiiiiq �� UM li uuttiN11lfilu" r 44 N�i t ItI Iltillliilll HMI iitli iitiliEl4R`"� [ [ ItUli I alllul UOUli U uuifE uHigUl ilil mussuiAmils UNU li { ir! Eu EERIE. RI MMIALUMIEVIIIIIION lure! I elifi I N Ui IU UtUM1 uISMU ilU NUEIE IU11 1110 UIM ,; ,Y ,s r i III IliiElitilm iii i IMAM rr* 7 1!111 flit > :Ef 1, !' I�� _ s !I !� MOM Ua # 11_Ili1WEltlliliflilitA l IEIUI tM Mr ti et ,iU IllllU inww f, MUM � [ U IIEIIU�II# �E EI'iI tliilU ��IIL�Hi�l� lNElf#tUi iNEllilili tiiir�lil �'rT;l E ri 1 :I 1 E Is I 1 UIBIIIMU uuunniiMUUUMIlltilt Ull NIIXifUlill�li�ggUEl UIIRI E i NIX E it IIUtE Ill III���EtEi111f:' 1 il1R ttiU 1 �tllllii € E �E#t1 . �lll MIME= nitlg uuuuSmllliUtitii ■�uu UUuswliirtnnu uiuusm L$ , lip ■iN� uu �U amisso lu ■sus utun ltll uiniRAlltti aEE unsu ti unuusuusuo t11A ! CIE i�tllillllill i>IR REIiIUIRNiilp� UNIT ilNIUMiilNE R ipglYilllen 11 I �SONSI IEN I MA! IN �1 Aull m muu iumis 11th■ RllIEEElUEMIUIU E illtMMIIIIWIli zHIM inurnum Um NM �U# HuI IlHlilltli UMI U IUUiItii11linualtin ililllttutuuttill io ,lull! us TEL I��ini ■i■ Nit! ■Il Uffi lil i IUMUSHIMiIMBI IUUsisumiliilFllliiilusl iN�Ei �U UEil�ltlii i1EUaUlil fl fI iltftlMUNIII 1IUMIl311111!i NNUMMU#t■it IONINORRU1111i1UI1ItIRMIIW ilUtiilli 1!■ unumu��mananam9�t#ili11ii11Hgi1n ice: unm 1 1 1 ni in own r i /MIMI ���li MOM 1111111 UM1M�1MIUMM 11 ii #WiiI MUM! 1M fiMMIUMifin ni UM N t�n 1111 NOM R�lttlftilMIM I�IMUM UNSIIIIfE IIMIit1EiINUI ■1f REIRRNtt L UI gltll UIVIMMINIM RRiUIEi RS IiNR Uii ■itiiEi UMUNU URRIU ■ININOM ■ IN Mh` NIMMI' ■UIMIHUU`U r U. . Y N i IIIi11Ut 1 N IEltiii4lt�UlU N � UUUpt i1■.; il i� '`� Eiu WU 11MIumw uilEEU7 I 111 Wiumni$ aUHM IUM11 SUMS � gp tIIili MINN int �IInUi1R4 . , r M■ I IiflglilUi# ■; E F z RUt $ r 1 URd Ui iii# . ft aumn E�� YI p I T i i iniumusli U Ia r s iiWiRUligl it l _ �I [ ■ ; . I .. ressor Project Clayey Sara With Gravel t: 18 °A gut► MU ter ~ w %o L. vl ti 13 v a ! r' r 3 -E. P s I i i i t ill UM _ IUnIiM■lailan in ',' r i a��� ) i E i Mann I E un Unainlii I /�N ! l i E r u1I111 ! unam Uu , U f 1 ifiinna , ;r BQrehpie: ▪ Ercana North Campres or Project n O111 1f1 118 Rn1ii1111mAA MU u1m r H I �� H IBUIOURIMMI ✓ P 7 iI2' _' '' Iti :: I I.111111111111A!�p IW�11�Nf •�I • Depth: + 11ii ■1 IAV>I1tl1l1111W1aRI iAli�A�A illUil ■ +r 11 U M111m[inu 111 uinulitlfi1111fi 11111W111I +, . I III E Sample Description: Salty Clay With Gravel and Sand m A11AWi1s i i1 Il +; I, Blow Count per 1'; 1.1 mina IE r I I EIMUll UMW BIM s= t l l I s i U 811111111 r- f r f s I r�Tr I E€ T I Initial Moisture Content. itiA�AiB111 AlgaiitStfl ■ in 11111�Mainil Ni11ia� 1���� 1 1 iimugnrl ism ` ! "f hariliminegruramt Imu=vni.ira .1 MUM [ Sulk Density: 110 pof mum lIUMIIMIUMIII______MIM fill Mil 111-471 waiwialionn:74f ; t i, isatillUiiiiii Er#2 L. 21•1111111411111111 An mmaurnuni MUM infiniiMiiiirelaTUillitiniiiMilliMMIlinirw""""IIMPUThilltRIAN 113111.1411 imam II UlUWUIR Unimium1MIUMIIIIIIMISIMIIIMIUMMItillUilillurmillISUgg .1.-. ,1,. ., r'it.: IL nu limanaMillaralegEranalMeWal MUM alniantininallialatanlannIUMILMInnUffl 4, .41111/01. fl1 .,u,. n f11101i 11 1 ci IM 300 �fC A ti il u- E f s iY1 E �11AI 11i#aN1 IIIII IUu Ai 1 11111 l 1! j . I IU 1 T E E r ilillilillll ++alNi A E U F r ! 1 7 I., I jA F�■;� t., r f i k a f 1 E !1!11111 ! p� Ai11111W11<itl i!W 1!t! ! tE E p : s A1A81�1 i I E E WI I UI z c t +1111'111 118tl8ia E- f +! 1! f 1M . 1 r_ ,.: I: 4 t E t € 11■ , t s I, I 1 t I r 't I E€ E f 1IIiI1A1aBmrllf II ►►U 1111 IninnfinThi -1 B p 4 i 11111!11 panr1m E t1S t, _�,•i l i t —e t Eii EE l I ri1 II1 E I1 ISB�11 s 11 ! 11 t I.•I•',„ ,,_ 1 , ____ 1 111■ -� 1 , d -r 1 . �f. r C -)1 • - 1 ' ---I -„,_I •r- te I 1l1Q11181A111111 I )11' nenstonall Volum Change 11111111111 11111 WI1I 1 118 its I I I �. . 1 r; �O r rSI itI I!il :H 1 I UI 1, f gi•7■iA�� n e s7 r a C P.I iI 01 ,iT 1,71 l;ll t L L • L I : Y , > ' Li A U C, W Gr tq !" 1r H i., `� 4 P W CO Fi . } N 1� l 1 1g 1�n �� Elm , = fun c n li. , .t , t,' p111t1111A11 Ifrllf,t UIIIIfltllnlfla ItI I if�nt,rlt M■I,r �1 r 111111I1illii I■1 � ■muIIlil,llh1 mt N 11EIu1 N I 11 I! �'��1 ! :,r .. mum ) ! Encalia North Gorrr • ressor Project l lli�lllillllillul 111111,r1IlYtfUlflN d,ICinI 1#listl$l1Rl C� 11 1 n�1 9 1"1tC,.. 1 ; Borehole: 2 sumumituniumuffiturnalmmu t1111fIttUlnitiilltl �111r91111I1111ii31 ■1,ri1N1l1111111U ■11 UM111,1119141p1r11 tl M 11111 Depth: 112' If R1 rRr ill! ■l„M,r11 innitill■it111#grfn /1 m100111 g 1[ w11WEINISIMrlrrllf 1 ! ■01 I11111110M1 1tlif■,Iunni11umllM m i ■ 1i�J MIYMIW11IM -� Sample Description: layey Sand With Gravel --- - eaum llregErr�lnl�mrf�rlr lumamme n r `J •- i I ■ lil�fllll ;llfkllil�lltlllua■■arrl,f�lt! Ilfafl( Ilf! 1g1�,i1: Blow Count per '12 . a NH,1111I11 1f9111�1n1N1I . ; !, ! 1 �f�11mmun111111111I1<■ IUM cf E ,114q'tE! k,i ll ■1r1ir7f1N1 �111IN nim om initial Moisture Conte 1: 10% ' i laniton E InffES� n ,�} f �r! { i1111f1i11u11 �� 3 r i 1M, muto 9g9 lrIfltf �m�p��uin1 1181 Iti■ > I: 1�,� it ' t irj Final Moisture Conte t: 29% 'IIMIMullildrtu ulll lmn '1 1,11 11� .91 i>1 , r1 v IN001u� 1 I!, , i i Bulk Density: 1 �� c IOWA . ;, ,;, � I ' 3 �f t r i s laff IIII Y {� nlEfll�lu11�1r1�111Ip�Eli�li ■Wi# 171M�1N� li ;. 1111.11110111110012111111111101101010100110110111110101W01101 �I 1"• i� De•is 95 11.11 i I I { nlll T �; ' Ill ti i... f'": Dry � � �■� ■�lflrnWllitl 1111inf11�111161 t■ ■113 ri ■■■RH1fN i � r y g ` �I'I; {r-r •. 1 I i '1" j "j :y ._. 11111111111011111n1i1nn�ll i� ®illnlilliEi■niil g .,11!!11 '. 11• r• I' 1 }■�•1} 3 ,411' 3 ? 4 1Y1.11111 ��111111,iillR[e11�1111■ �tlrlllilf 111111111 , u : !■011illliiii��� A,R ■It�flrq� 14 53 it 1,11fj I I[1 f �® 0 ii mmuMmlin ■NfillEitlii• I�■f 1�119 pp f m it 1. ■ ■IUUUIHI lItill�ll 1 111111 n 03.10011 10 fi11Mf# ,1,1rin iuuut lliililiIlt,■t•llinue 181 IIIIIIlIf1ii a 1 ! I ? t €t tai ,1,1!11 llnMll,itllflalifi 1 l rgillIC iIIIMitiiidl � ,rflfiulf Iillglw IfltrilntlfllliFiliilrr �i of IIILIII� , :T� , r! Its! 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I f i i . •111,111,11 rILl1111 111 11111!111, 1 Wllin:�lfl 11 in 00 1001 :::� 110111 {dill,11111�B�ltUMMU1,trlll t'H 111111121 r I filtlfIIIMIg1 1 m a n1! 1111111 101111 111 1tl1 �1t11n11111q 1111nni1i11l1191111IIIMI INNIU11111n1M1 1111111111111111111 11111 M MIIII _ 1R1i11t1 MII ■�gllf,Ilr �1t11tI111 maunuatu lltlE#EElt6iiil#�� �1>imannu unNF 1 un I 9 ! 111 11„ nniln11I11M1, tllNilll1111i91111f1E <fi#n I10R>t11l1inff 1111 DUI /11/1111 ttl�1N■u r� ll! 1111 �/rt1■111r� 1111111111111UMMIrIt MIII11U1f9illt tIII IIIIM1 1fNliii W1i1�11111111�e� � in ,RN,t1■1n1, II1111 ifilli11IMi >fitl1111111#Hiinllnf3f iUMMInwinutR1�1111MMI 111 IIt simmummugiuguiusummumunuummuumiummumnum sminamommunim 11f1NN 1t111gi10110 111111111 1 t -, ummuut I,I,ti17umiknlitUUNUMuunillg11 UIMINI- 1#1 UMUMUIUSU 11tHiiIUN lrlllll8 100m,AM111inininuarionnuniii luuna111•mmi minim 11nuu i Nl 11��11,liillffG111 ■,1IIY,r111 X111 li Il lllttlI11gqn11 1111�ilil9111111lgwlli ■11■11I iNi11�IN■Ii■ #1� fiinnilln `+I Iun 1 ! 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I : �1 r. �3 11111111 1 n1H1 t N I Mf MMIIii111i i ? 11 11 t i■n1nl1 9 i Mll ! 111E i l , I • , IInn , IIM 1II unuallul is a r1i11�j q�IS �i1IN91tt1i11 gr11 I�H�■I 11ilAA1�lflal <, ilinhilni 1 I 1 �IWU� 111 I Nfi■114 ! lWl! 1111 Ill NUR 111 ��1 U 1s R] ,D UN1 11111 INEI ! 1 1 IIUUIUUI , i T ; rf ; t s � �.r.n.os� p �' I i- � n k tr t iR I. _._._t-�N lIF7�[liif'I17� E I 1 .0 : E .� uu ouu 1 1 r. Encana Mort Camplessor Project ♦ lnumui ■r, ; ! 1111E liliEBa ItlitllUn Borehole: n�lalllln 11 1 1 �1111LIWIUMUMU1 1 1, j M UI1 v1� I 1. 1 UUU)<l1EI���IN Depth: 2 112 l ! i Blow Count per 121`' 57, I t?-� ��u initial Moisture Content 10% ,F Il uu ■ Final Moisture Content: 22% In Bulk Density: 90 pcf Dry Density: 82 pcf i 1,i IIU "•'If1 1 I I ! t 111/1111 IIII11A11Iul� `: Min Lnunamusuu koruesul ■ uiiis ii unit ;_, ? 1 ,_p,1" I 1 �T�� i ! ,E I 1 kt}� tll1 r a : i: e 1 �f 1`T`;'igI `U` M t 4 ..1 I ; 1 1 I t 1 E m11 i n ", i vu f mum_ 111, r�lMO I, r , ; ; �fs lnhIp� k .;e - -Fif �...5.., i •.. 3 11 1 1 e�.., ,�...;T 1 r•'� i� 7; , , ' 1 X 511 I ; 1 1 i (rrifTi I= , �■ 1 1-1 "�I ^! 13�.r'ta"in. #T[F'y��tUDINU INUI I x f - i ¢ _ "`i 1 I I 11 �i ,1l'11I1ii11i 11 111 + S E 3 i rE II { 3; I! i" 1 I ! 1 I I! 1 i 5 E s err! 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SYMBOL SAMPLE DEPTH DESCRIPTION TEST OPTIMUM MAX. DRY LOCATION (tt) METHOD MOISTURE( ?A) DENSITY(pd) �) Bore T -5 clayey sand with gravel D698 _ R 'MARK; ladk sample taken ot( auger CIVIL TECH Encana Gas Compressor Station 1 Middle Fork Compressor Station 2007 Expansion Integrated Vegetation and Noxious Weed Management Plan North Parachute Ranch EnCana Oil & Gas (USA) Inc. Photo 1. Middle Fork Compressor Station, North Parachute Ranch, January 2007. Prepared by: WestWater Engineering, Inc. 2516 Foresight Circle #1 Grand Junction, CO 81505 970-241-7076 January 2007 Middle Fork Compressor Station 2007 Expansion Integrated Vegetation and Noxious Weed Management Plan January 2007 introduction This plan is for compliance with Planning and Zoning Regulation 9.07 (13). Because the expansion takes place entirely within the existing Compressor Station site, this plan is identical to the plan submitted for compliance with Condition No. 4; parts a, b, and c; Resolution No. 2005 -85; November 7, 2005; Board of County Commissioners (BOCC, 2006), Garfield County. The plan is for the Middle Fork Compressor Station on North Parachute Ranch (NPR) on County Road 215 (Map; Figure 2, page 12). On January 4, 2007, a field inspection of the site was conducted by WestWater Engineering (WWE) biologists. The inspection identified appropriate topics for inclusion in an integrated vegetation and noxious weed management plan. Factors considered include soil type and texture, existing land management, absence or presence of listed noxious weeds and potential natural vegetation community. The site was previously a portion of an oil shale retort complex. It is adjacent to a produced water treatment facility, tank farm and staging arca for equipment, parts and supplies. High use roads surround the site. Field conditions were poor to conduct the inspection with snow covering much of the site and surrounding terrain (Photo 1, page 1). Snow cover precluded a thorough survey for rosettes of weeds that may hinder re- vegetation. WWE, biologists have spent considerable time conducting studies of sensitive plants and wildlife on other NPR projects and, as a result, are able to make recommendations in this plan which are appropriate to the site. Landscape Setting The Middle Fork Compressor Station is located on the first terrace above the East Fork of Parachute Creek at the toe of the cliffs and escarpment formed of the Green River Formation. The site is relatively flat but terrain quickly rises to rock escarpments immediately north of the complex. Medium textured Ni hill channcry loam soils are present, but were not segregated prior to industrial construction and disturbance. This series is deep, well- drained and usually derived from alluvium (NRCS, 2007). The site has an obvious colluvial component due to erosion of the escarpment. Characteristic natural vegetation includes western wheatgrass (Pascopvrant sntithii), big sagebrush (Artemesia tridentata spp.), bluebunch wheatgrass (Pseudorogneria spicata .spicata), Indian ricegrass (Aehnatherum ftvntenoider), needleandthread (flespernsliprl enmatn) and yellow rabbitbrush (Chrvsothamntts visci i/lo "is) (NRCS, 2006c). Undisturbed slopes adjacent to the compressor station were found to have predicted vegetation including sagebrush - rabbitbrush shrubland east of the site (Photo 2) and mixed salt desert shrubland on the steep slope north of the station (Photo 3). Predicted grass species were also present in low density. A native thistle, Cirsium barnebyl was found on the cut slope of the Long Ridge road approximately 100 meters above the site. This native thistle is not invasive and should not be controlled or treated. WestWater Engineering M. F. Compressor Station IVNWVIP Page 1 of 11 Photo 2. Rabbitbrush east of compressors. Photo 3. Sagebrush- rabbitbrush north of compressors. Amount of Infested Land to be Manaeed The compressor station and surrounding disturbance is approximately 9 acres and the surrounding developed and disturbed environment is an additional 18 acres. Disturbed areas immediately adjacent to the compressor station (within 10 meters) had no observable infestation of noxious weeds regulated by Garfield County on the date of inspection. Because of previous investigations in the arca, WWE biologists are aware of listed noxious weeds within 250 meters of the compressor station. The noxious weeds in the vicinity have been receiving treatment but are found in low density in most cases. Total, non - selective vegetation control is recomrncnded within the perimeter of the 3 acre compressor station for practical and safety reasons. Newer non - selective herbicides such as DuPont Sahara® are formulated to reduce migration and leaching into non- target areas and require very low amounts of active ingredient which decreases probability ofbio- accumulation in non - target species. Temporary disturbance of the perimeter is recommended to be reclaimed with the recommended seed mix and spot treated with selective herbicides or mechanical control if noxious weeds invade, all of which are described in the appropriate sections of this report. Targeted Weeds: Although not currently found on the compressor site, Table 1 lists weeds nearby and those most likely to be the subject of future control efforts within and around the site. Table 1. NPR Middle Fork Compressor Station Expansion list of possible noxious weeds. 'otnnton Name * / USDA Symbol Scientific Name Type ** Control Methods cheatgrassc BRTE Bromrrs tectoruna A Plant competitive grasses, limit grazing. chicory CIIN Cicltnr!tun lntybus P Plant competitive grasses in disturbed areas, be alert. herbicides work best on rosettes. Mowing can reduce an infestation. common burdock ARMI2 Arctium minus B Cut and dig rosettes and bolting plants, re -seed with aggressive grasses. Ilcrbicides probably necessary due to widespread infestation and large number of seed bearing mature plants. WestWater Engineering M. F. Compressor Station IVNWMP tage 2 of 11 Table I. NPR diddle Fork Compressor Station Expansion list of possible noxious weeds. Common Name *I USDA Sy ntbol Scientific Name 'Type ** Control Methods common mullein' V ETII !'encascum r/iapsis 8 same as common burdock field bindweed. COAR4 ConivIvitlu.s arrensis P Herbicides in fall, plant competitive grasses, introduce mites. houndstongue CYOF Cynaglnss„n, ofclnale 13 Re -seed with aggressive grasses, remove at !lowering or early seed, dig or grub at pre -bud or rosette stage or apply herbicides. salt cedar Tamarix ramasissiara P Repeated or historic flooding of hottomlands to prevent seedling establishment; hand pulling seedlings; spray herbicides on basal portion of stems of young, smooth barked plants, cut larger plants and treat cut slumps within 30 minutes with herbicide plus an adjuvant (remove all stems from site after cutting - they will re- sprout if in contact with soil); shade intolerant - promote growth of native riparian species that will shade out the tamarisk. Thistle, Canada CIAR4 Cirsiun, arvense P Mowing every 2 weeks over 3 growing seasons and using parasitic insects or mowing every 2 or 3 weeks followed by herbicide application in late summer or fall, with combination treatments working best, When using herbicides use a mix with two different modes of action. Re- seeding with grasses only to allow spraying only when using appropriate herbicides. Thistle, Musk Carduus anions Tillage or hand grubbing in the rosette stage, mowing at bolting or early flowering, seed head & rosette weevils, leaf feeding beetles, herbicides in rosette singe. a LC K ILU� -t Y, .otorauo ucpartmcnt of Agriculture, Bold type on Garfield County list, "State of Colorado "13" list, !State of Colorado "C" list (Sta c of Colorado, 2005). ** A— annual, 13— biennial. and P- perennial. The strategics summarized in Table 2 for annuals and biennials and in Table 3 for perennials are those found to be most effective depending on the growth habits of each species (i.e., annual, biennial, or perennial). This information is contained herein to emphasize the importance of knowing for certain the species of weeds present. Table 2. Treatment Strategics for Annual and Biennial Noxious Weeds Target: Prevent Seed Production I. 1 iand-gr+.tb till in -(pull),hoe; tultivatc rosette-stage -nod before-tlowel ing or seed maturity. If seeds develop, cut and bag seed heads. 2. Chop roots with a spade below soil level. 3. Treat with herbicide in rosette or bolting stage, before flowering. 4. Mow biennials after bolting stage, before seed set. Mowing annuals will not prevent flowering but can reduce total seed production. WeslWater Engineering M. F. Compressor Station IVNWVIP Page 3 of 11 Table 3. Treatment Strategies for Perennials Target: Deplete nutrient reserves in root system, prevent seed production 1. Allow plants to expend as much energy from root system as possible, do not treat when first emerging in spring but allow growth to bud/bloom stage. If seeds develop, cut and bag if possible. 2. Herbicide treatment at bud to bloom stage or in the fall (recommended, after August 15 when natural prccipitatiuu is prescnt). In the fall plants draw nutrients into the roots for winter storage. Herbicides will be drawn down to the roots more efficiently at this time due to translocation of nutrients to roots rather than leaves. If the weed patch has been present for a long period of time, another season of seed production is not as important as getting the herbicide into the root system. Spraying in fall (alter middle August) will kill the following year's shoots. which arc being formed on the roots at (his tine. 3. Mowing usually is not recommended because the plants will flower anyway; seed production should be reduced. Matey studies havc.shown that mowing perennials and spraying the re- growth is not as effective as spraying without mowing. Effect of mowing is species dependent; therefore, it is imperative to know the species and its basic biology. Timing of application must he done when biologically appropriate which is not necessarily convenient. 4. Tillage may or may not be effective. Most perennial roots can sprout from pieces only 1/2" - 1" long. Clean machinery thoroughly before leaving the weed patch. 5. Hand pulling is generally not recommended for perennial species unless it is known the plants are seedlings and not established plants. Hand pulling can be effective 011 small patches but is very labor intensive because it must be done repeatedly. Best Management Practices The following practices should be adopted for any construction project to reduce the costs of noxious weed control. The practices include: • top soil, where present, should be segregated from deeper soils and replaced as top soil on the final grade, • in all cases temporary disturbance should be kept to an absolute minimum, • equipment and Materials handling should be done on established sites, • disturbances should be immediately replanted with the recommended mix in the re- vegetation section. In areas with slope greater than 3 %, imprinting of the seed bed is recommended. Imprinting can be in the form of dozer tracks or furrows perpendicular to the direction of slope. When hydro - seeding or mulching, imprinting should be done prior to seeding unless the mulch is to be crimped into the soil surface. If broadcast seeding and harrowing, imprinting should be done as part of the harrowing. Furrowing can be done by several methods, the most simple of which is to drill seed perpendicular to the direction of slope in a prepared bed. Other simple imprinting methods-include-deep hand ra nd- harrowirtvaiways perpendicular to-the direction of slope. Herbicides: Herbicide treatment in fall (after approximately August 15 when natural precipitation is present) is the best method to control difficult perennials such as Canada thistle. Difficult species respond better to application of a combination of two or more chemical modes of action (biological reason for plant death) rather than one. Local certified commercial herbicide applicators report best control of Canada thistle using a combination of modes of action. it has also been found that use of two different groups of chemicals in the same mode of action can increase effectiveness on difficult species, e.g., phenoxys and benzoic acids or carboxylic acids WestWater Engineering M. F. Compressor Station IVNWMP Page 4 of 11 and benzoic acids in a mix. Some come commercially pre - mixed, e.g. Crossbow® and Super Weed -be -Gone Max® which are available over the counter. Many of' the most effective herbicides are restricted use and available only for licensed applicators. Professionals or landowners using herbicides must use the concentration specified on the label for the target species. Herbicides generally do not work better at higher concentrations. Label restrictions and formulations must be adhered to for compliance with regulations. Most herbicide applications should use a surfactant as directed on the herbicide label or other adjuvants as called for on the herbicide label. Crazing: There is no grazing of domestic animals. Evidence of grazing by mule deer, Odocoileus hentionus, is very low and not of sufficient intensity to affect reclamation. Mechanical: It is recommended senescent, seed - bearing, listed weeds be cut, bagged and disposed of in a licensed landfill. Rosettes can be cut with a shovel below the surface of the soil on plants which are not yet dormant. Even with some seed drop, cutting and bagging will greatly reduce seed release. Future need to use mechanical or other control methods should be reduced after only two seasons of cutting and bagging. Photo 4. Seed bearing burdock. Photo 6. 11oundstongue rosette. WesiWater Engineering Photo 5. Seed bearing musk thistle. Photo 1. Musk thistle rosette, M. F. Compressor Station IVNWMP rage 5 of 11 and benzoic acids in a mix. Some come commercially pre - mixed, e.g. Crossbow® and Super Weed -be -Gone Max® which are available over the counter. Many of the most effective herbicides are restricted use and available only for licensed applicators. Professionals or landowners using herbicides must use the concentration specified on the label for the target species. Herbicides generally do not work better at higher concentrations_ Label restrictions and formulations roust be adhered to for compliance with regulations. Most herbicide applications should use a surfactant as directed on the herbicide label or other adjuvants as called for on the herbicide label. (;razing: There is no grazing of domestic animals. Evidence of grazing by mule deer, Odocoileus hernionus, is very low and not of sufficient intensity to affect reclamation. Mechanical: it is recommended senescent, seed - bearing, listed weeds be cut, bagged and disposed of in a licensed landfill. Rosettes can be cut with a shovel below the surface of the soil on plants which are not yet dormant. Even with some seed drop, cutting and bagging will greatly reduce seed release. Future need to use mechanical or other control methods should be reduced after only two seasons of cutting and bagging. Photo 4. Seed bearing burdock. Photo 5. Seed bearing musk thistle. Photo 6. Iloundstungue rosette. Photo 1. WestWater Engineering ;'.4 X Iusk thistle rosette. M. F. Compressor Station IVNWMP Page 5 of 11 Alternative Methods Some noxious weeds are subject to damage from beneficial insects, included are Canada thistle stem mining beetle, Ceutorhynchus littera; Canada thistle bud weevil, Larinus planes; musk and plumeless thistle rosette weevil, Tricho.sirora/u. hot-thins: Canada thistle stem gall fly, Urophara cardui; and thistle defoliating beetle, Cussed' rubiginosa, which feeds on the foliage of Canada, musk and ['tameless thistles (Sullivan, 2004). Currently, the thistles present are not of sufficient density, in the opinion of WWE, to support populations of insect parasites. Therefore it is unlikely these insects would be helpful unless explosive spread and growth occurs in the future. The bindweed mite, Aceria nralherhae, is a microscopic mite imported from southern Europe as a biological control agent for field bindweed (Hammon, 2006). According to recent anecdotal information it may be a very effective control for bindweed, This mite may be useful for reducing field bindweed infestations which can become highly invasive in the vicinity. Another alternative method, particularly for cheatgrass infestations and poor to non- existent topsoils, is the application of vesicular- arbuscular mycorrhizal fungi (V /AMF). These fungi, mostly of the genus Gloms,. arc symbiotic with about 80% of all vegetation. In symbiosis, the fungi increase water and nutrient transfer capacity of the host root system by as much as several orders of magnitude (Barrow and McCaslin, 1995). Over- the - counter V /AMF or AMF commercial products, which are better adapted to coating seeds when reseeding and treating roots of live seedling trees and shrubs at time of planting, come in powder form and are available from many different sources. Some applicators, including a New Castle company, collect and grow local accessions of V /AMF. The latter are applied to weed patches and are reputed to greatly increase competition of native plants with Canada thistle in particular thereby affecting a non- chemical control of some noxious weeds. Re- vegetation Soil types on the property generally support many of the same species of native vegetation. The following seed mix is from the reclamation plan developed for NPR by WWE (Table 4). Table 4. Recommended seed mix for NPR lower zone disturbances. S ecies Varlet ' cultivar Arriba Seedin Rate PI.S *IAc western wheatgrass (Pasropvranna smithii) 3.0 Ibs _aectifeandthread4Erican rra_nanscous) 1.0 lbs thickspikc wheatgrass (Elrrrta s lurucevlruw, harrc olutrrs) indian ricegrass (Ache atlrerum hvnaenoides) Crilana Paloma 2.0 Ibs 2.0 Ibs bluebunch wheatgrass (Pseudarognerin spicata spicata) P7 preferred, Goldar, Anatonc or WhiIn ar 1.0 lbs scarlet globemallow (Sphaeralcea coccinea) fl 5 lhs Utah swcetvetch (Hedvsarurn boreale) 1.0 lbs cicer milkvetch (Astragu!us cicer) 0.5 Ibs Lewis flax (Linwn tewisii) Ma le Grove 0.5 lbs W estWater Engineering M. F. Compressor Station IVN WMP Page 6 or 11 Table 4. Recommended seed mix for NPR lower zone disturbances. S ecies rubber rabbitbrush (E,-icxr,neria itutrseustrs) four -wing saltbush (Atripler ecruesccns) Gardner saltbush (Atriplev gardnc'ril and /or shadscale saltbush (Atriplee con/irtifoI!al Varlet eultivar Seedin Rate 1 ,S * /Ae L0lbs Wylana I.OIbs 1.0 Ibs 'Pure Live Seed (('NI-1P, I998: NRCS, 2002; NIX'S, 2006a; NRCS. 2006b1 Total 14.5lbs Is /ac Seeding rate should be doubled for broadcast application. Preferred seeding method is hydrosecding or multiple seed bin rangeland drill with no soil preparation other than simple grading to slope and waterbars. Seed should be bagged separately so each size group of seed can be metered at the appropriate rate. Alternative seeding methods include but are not limited to: • harrow with just enough soil moisture to create a rough surface, broadcast seed and re- harrow, preferably at a 90 degree angle to the first harrow, • hand raking and broadcast followed by re-raking at a 90 dcgrcc angle to the first raking. • These are not the only means of replanting the site. However, these methods have been observed to be effective in similar landscapes. Life Cycle and Management Calendars Figure 1 is a 2 year calendar for control and life cycle of biennial thistles. Not included is mechanical control, which is cutting of rosettes below the soil surface and can be done any time during the rosette stage. Figue 1. Life Cycle and Management strategies for biennial thistles, Herbicide Application Herh, Mowing Appl. Year 1 War 2 Haitzlcr, 2006. WestWater Engineering M, F. Compressor Station IVNWMP Page 7 of 11 Table 5 is a calendar of strategies and when to undertake them specifically for Canada thistle. Table 5. Canada thistle management calendar ants ounty cooperative Extension Service. Table 6 is for other listed noxious weed species known to be present in the vicinity. Table 6. Noxious Weed Biology Species Type* Jan Feb March April Ma) tiro, July. Houndstongue B rosettes - -> probed flowering - seed set germination salt cedar' P semi- dormancy leaves emerge Common B germination rosettes burdock B = biennial; l' = perennial Shaded areas indicate best control liming. *Tamarisk control can be done at any time of year, but is easier when leaves are absent and weather is cooler. (Skate. 2004} flowering & seed set bolting -3 growth Aug Sept Oct Nov Dec flowering & seed sot senescence & semi - dormancy flowering - 4 4 rosettes seed set Commercial Applicator Recommendations A certified commercial applicator is a good choice for initial control efforts. An applicator has the full range of knowledge, skills, equipment and experience desired when dealing with Canada thistle and other difficult vegetation. A reputable local company, Julius Ag, Andy Julius, Certified Applicator's License No. 112 10, Julius Ag, 21691 -70 West Frontage Road, Debeque, CO 81630, 970 - 379 -6917 has the experience and knowledge necessary for success. Reclamation farming with multiple seed bin range drills and related equipment is also available through Julius Ag. An alternative applicator using V /AMF and other natural products locally is: Alpha Natural, Inc., 1808 Road 245, New Castle. CO 81647, 970 -9R4- 246_7, Common chemical and trade names may be used in this report. The use of trade names is for clarity by the reader. Inclusion of a trade name does not imply endorsement of that particular brand of herbicide and exclusion does not imply non - approval. Certified commercial applicators will decide which herbicide to use and at what concentration. Landowners using unrestricted products must obey all label warnings, cautions, and application concentrations. The authors of this report are not responsible for inappropriate herbicide use by readers. West Water Engineering M. F. Compressor Station IVNWMP Page 8 of I1 Jan Feb Mar Apr May June July -Aug Sep Oct Nov Dec Active Growth X X X X X X X Rio-Control {Grazing) X X Mowing X X Herbicide Application X X X X ants ounty cooperative Extension Service. Table 6 is for other listed noxious weed species known to be present in the vicinity. Table 6. Noxious Weed Biology Species Type* Jan Feb March April Ma) tiro, July. Houndstongue B rosettes - -> probed flowering - seed set germination salt cedar' P semi- dormancy leaves emerge Common B germination rosettes burdock B = biennial; l' = perennial Shaded areas indicate best control liming. *Tamarisk control can be done at any time of year, but is easier when leaves are absent and weather is cooler. (Skate. 2004} flowering & seed set bolting -3 growth Aug Sept Oct Nov Dec flowering & seed sot senescence & semi - dormancy flowering - 4 4 rosettes seed set Commercial Applicator Recommendations A certified commercial applicator is a good choice for initial control efforts. An applicator has the full range of knowledge, skills, equipment and experience desired when dealing with Canada thistle and other difficult vegetation. A reputable local company, Julius Ag, Andy Julius, Certified Applicator's License No. 112 10, Julius Ag, 21691 -70 West Frontage Road, Debeque, CO 81630, 970 - 379 -6917 has the experience and knowledge necessary for success. Reclamation farming with multiple seed bin range drills and related equipment is also available through Julius Ag. An alternative applicator using V /AMF and other natural products locally is: Alpha Natural, Inc., 1808 Road 245, New Castle. CO 81647, 970 -9R4- 246_7, Common chemical and trade names may be used in this report. The use of trade names is for clarity by the reader. Inclusion of a trade name does not imply endorsement of that particular brand of herbicide and exclusion does not imply non - approval. Certified commercial applicators will decide which herbicide to use and at what concentration. Landowners using unrestricted products must obey all label warnings, cautions, and application concentrations. The authors of this report are not responsible for inappropriate herbicide use by readers. West Water Engineering M. F. Compressor Station IVNWMP Page 8 of I1 LITERATURE CITED Adams County Cooperative Extension Service. 2001 Managing Canada thistle. Colorado State University Cooperative Extension. Brighton, CO. 2 pp. Barrow, J.R., and Bobby D. McCaslin. 1995. Role of microbes in resource management in arid ecosystems. In: Barrrow, J.R., E.D. McArthur, R.E. Soscbce, and Tausch, Robin J., comps. 1996. Proceedings: shnibland ecosystem dynamics in a changing environment, Gen. Tech. Rep. INT- GTR -338. Ogden, UT: USDA, For. Scrv., Intermountain Res. Sta., 275 pp. BOCC. 2006. Garfield County zoning resolution of 1978, amended October, 2006. Board of County Commissioners, Building and Planning Department, Glenwood Springs, CO, 78 pp. CNI -1P. 1998. Native Plant Re- vegetation Guide for Colorado. Caring for the Land Series, Vol. III, Colorado Natural Heritage Program, State of Colo., Div. Parks and Outdoor Rec., Dept. Nat. Res., Denver, CO, 258 pp. Hammon, Bob. 2006. Managing Field Bindweed with the Bindweed Mite Acer•iu malherboe. Cooperative Extension Service, Colorado State University, Fort Collins. URL: http: / /www.coopext.colostate.edu /1 RA /PLANTS/ index. html #http: / /www.coopcxt.colosta te. eduJTRA /PI.AN1"S /hindweedmitc.htnil Hartzler, Bob. 2006. Biennial thistles of Iowa. ISU Extension Agronomy. URL: http://www.weeds.iastate.edu/mgmt/2006/iowathistles.shtml NRCS. 2002. Plant suitability and seeding rates for conservation plantings in Colorado. Natural Resource Conservation Service, Technical Note No. 59 (rev), USDA, CO Field Office, Lakewood, CO, 6 pp. NRCS. 2006a. The PLANTS Database (blip: / /plants.usda.gov). National Plant Data Center, US Department of Agriculture, Baton Rouge, LA 70874 -4490 USA. NRCS. 2006b. Plant guide blue flax. US Dept. Agriculture, Plant Materials <http: / /plant- materials.nres.usda.gov!>, 4 pp. NRCS. 2006c Web -SaiI Survey, US Dept. of Agriculture. URL: ( http : / /websoilsurvey.nres.usda.gov) NRCS. 2007. Nihill series official description. (http://www2.11w,nrcs.usda.gov/osdidat/N/N1HILL.html) Sirota, Judith, 2004. Best management practices for noxious weeds of Mesa County. CSU Cooperative Extension Tririver Area. Grand Junction. 4 pp. WestWater Engineering M. F. Compressor Station IVNWMP Page 9 of 11 State of Colorado. 2005. Rules pertaining to the administration and enforcement of the Colorado Noxious Weed Act, 35-5-1-119, C.R.S. 2003, Department of Agriculture, Plant Industry Division, Denver, 78 pp. Sullivan, Preston, G. 2004. Thistle control alternatives. Appropriate Technology Transfer for Rural Areas, National Sustainable Agriculture information Service, Fayetteville, AR, 9 pp. WestWater Engineering M. F. Compressor Station IVNWMP Page 10 of 11 Wildlife Assessment Middle Fork Compressor Station Expansion North Parachute Ranch Garfield County Special Use Permit Application Photo 1. Middle Fork Compressor Station Expansion from entrance looking southwest across facility. Prepared for: EnCana Oil and Gas (USA) Inc. Prepared by: WestWater Engineering Inc. 2516 Foresight Circle #1 Grand Junction, CO 81505 970 -241 -7076 Middle Fork Compressor Station Expansion North Parachute Ranch Wildlife Assessment Garfield County Special Use Permit Application Introduction The EnCana Oil and Gas (USA) Inc. (EnCana), Middle Fork Compressor Station Expansion is located in SW'/ SW %a Section 30, T5S, R96W, 6th PM of EnCana's North Parachute Ranch (NPR), aerial photo, Figure 1, page 6. The site was previously a portion of an oil shale retort complex. It is adjacent to a produced water treatment facility, tank farm, and staging area for equipment, parts and supplies. High use roads including County Road 215 and the Long Ridge Road surround the site. Field conditions were poor to conduct the inspection with mid - winter snow covering much of the site and surrounding terrain (Photo 1, page 1). Significantly, south facing slopes, of value to wintering wildlife, are snow free as seen in the Photo 1. EnCana has voluntarily made commitments to manage and conserve wildlife populations and habitat on NPR. EnCana's commitments to environmental management include voluntary inventories of sensitive natural resources on NPR to identify potential impacts of natural gas development. As a result, WestWater Engineering (WWE) biologists have spent many days in the project area in 2005 and 2006 completing wildlife surveys, inventories and assessments. During those surveys, biologists have noted occurrence of many important species of wildlife. Photo 2. Down - valley from east end of site. Photo 3. Across valley from east end of site. Site Inspection and Survey The perimeter and adjoining lands were surveyed for vegetation communities, soils and wildlife. Colorado Division of Wildlife, Natural Diversity Information Source was also consulted for documentation of wildlife occurrence in the vicinity of the compressor station (Table 1). WestWater Engineering Page 1 of 6 pages 2/2/2007 Table 1. Wildlife Occurrence Checklist for Middle Fork Compressor Station Expansion, NPR Common Name Scientific Name Occurrence Abundance - Western Chorus Frog Pseudacris iriseriata ^Known to occur Fairly Common American Crow Corvus brachyrhynchos Known to occur Fairly Common American Dipper Cinclus mexicanus Known to occur Uncommon American Goldfinch Carduelis trislis Known to occur Fairly Common American Kestrel Falco sparverius Known to occur Fairly Common American Peregrine Falcon Falco peregrinus anatum Known to occur Rare American Robin Turdus migratorius Known to occur Common American Tree Sparrow Spizella arborea Known to occur Unknown Bald Eagle Haliaeelus leucocephalus Known to occur Unknown Bewick's Wren Thryomanes bewickii Known to occur Fairly Common Black - billed Magpie Pica pica Known to occur Common Black- capped Chickadee Poecile atricapillus Known to occur Fairly Common Brewer's Blackbird Euphagus cyanocephalus Known to occur Common Brewer's Sparrow Spizella breweri Known to occur Common Brown Creeper Certhia americana ^Known to occur Uncommon Brown - headed Cowbird Molothrus ater Known to occur Common Bushtit Psallriparus minimus Known to occur Uncommon Canada Goose Branta canadensis Known to occur Common Canyon Wren Catherpes mexicanus Known to occur Uncommon Chipping Sparrow Spizella passerina Known to occur Common Clark's Nutcracker Nuci ra • a columbiana Known to occur Fairl Common Common Raven Corvus corax Known to occur Fairly Common Cooper's Hawk Accipiler cooperii Known to occur Uncommon Dark -eyed Junco Junco hyemalis Known to occur Common Downy Woodpecker Picoides pubescens Known to occur Uncommon Field Sparrow Spizella pusila Known to occur Unknown Golden Eagle Aquila chrysaetos Known to occur Uncommon Great Horned Owl Bubo virnianus Known to occur Uncommon Green - tailed Towhee Pipilo chlorurus Known to occur Common Green - winged teal Anas crecca Known to occur Fairly Common Hairy Woodpecker Picoides villosus Known to occur Uncommon Juniper Titmouse Baeolophus griseus Known to occur ✓Fairly Common Lessersioldfinch Carduelis - psaltria — Known-to-oeeur Fairly-Common Long -eared Owl Asio alus Known to occur Uncommon MacGillivray's Warbler Oporornis tolmiei Known to occur Fairly Common Mallard Ana platyrhynchos Known to occur Common Mourning Dove Zenaida macroura Known to occur Common Northern Flicker Colaples auralus Known to occur Fairly Common Norther harrier Circus cyaneus Known to occur Uncommon Northern Pygmy -Owl Glaucidium gnoma Known to occur Rare Pine Siskin Carduelis pinus Known to occur Common Pygmy Nuthatch Sitla pygmaea Known to occur Rare Red Crossbill Loxia curvirostra Known to occur Uncommon Red- tailed Hawk Buteo jamaicensis Known to occur Uncommon WestWater Engineering Page 2 of 6 pages 2/2/2007 Table 1. Wildlife Occurrence Checklist for Middle Fork Compressor Common Name Scientific Name Occurrence Abundance Greater Sage Grouse Centrocercus urophasianus Known to occur Uncommon Sage Sparrow Amphispiza be11i Known to occur Uncommon Sage Thrasher Oreoscoptes montanus Known to occur Uncommon Sharp- shinned Hawk Accipiter striatus Known to occur Uncommon Spotted Towhee Pipilo maculatus Known to occur Common Swainson's Hawk Buteo swainsoni Known to occur Uncommon Vesper Sparrow Pooecetes gramineus Known to occur Common Western Bluebird Sialia mexicana Known to occur Rare Western Kingbird Tyrannus verticalis Known to occur Fairly Common White- breasted Nuthatch Sitia carolinensis Known to occur Fairly Common White - crowned Sparrow Zonotrichia leucophrys Known to occur Fairly Common Wild Turkey Meleagris gallopavo Known to occur Uncommon American Elk Cervus canadensis Known to occur Abundant Bobcat Lynx rufus Known to occur Common Common Muskrat Ondatra zibethicus Known to occur Common Common Porcupine Erethizon dorsalum Known to occur Uncommon Coyote Canis latrans Known to occur Abundant Deer Mouse Peromyscus maniculatus Known to occur Abundant Mule Deer Odocoileus hemionus Known to occur Abundant Fence Lizard Sceloporus undulalus Known to occur Common Racer Coluber constrictor Known to occur Uncommon Western Terrestrial Garter Snake Thamnophis elegans Known to occur Fairly Common Bold face indicates known occurrence on site or nearby. Other Occurrence is for Garfield County in similar habitat prior to land disturbing construction, * *Abundance is for where found in Garfield County, not necessarily this site. The list of wildlife species which could be expected to be observed on or from the site prior to industrial development is presented in Table 1. While the list may not be comprehensive or complete, it does serve to illustrate wildlife diversity. Species in bold type have been observed by WWE biologists either on the day of inspection or previously within 1,500 meters of the compressor station site. County data obtained from the Colorado Division of Wildlife County Species Occurrence database was modified by WWE biologists for the Middle Fork Compressor Station site (CDOW, 2007). Modifications were based on the vegetation communities presently adjoining the site and potential wildlife using those vegetation communities, not only at the time of year of the survey but for any time during the annual life cycle of the species listed. Discussion The affected landscape is a convergence of several landforms resulting in diversity of vegetation communities. A greater than expected diversity of vegetation communities results in greater wildlife diversity. The open, formerly big sagebrush -grass meadow (e.g. Artemesia tridentata spp. /Elymus spp.) between the East Fork and Middle Fork of Parachute Creek lies between narrowleaf or Fremont cottonwood riparian woodlands (Populus angustifolia or P. fremontii/Acer negundo), which are found on both streams south and west of the site. Spruce -fir woodlands (e.g. Picea engelmannii /Abies lasiocarpa) and mountain shrublands (e.g. Quercus WestWater Engineering Page 3 of 6 pages 2/2/2007 gambelii /Amelanchier utahensis) on steeper, rugged slopes provide multiple uses for many species and include escape cover for mule deer and nesting habitat for important raptors and many of the species mentioned in Table 1. A fifth vegetation community, salt desert shrubland, Atriplex confertifolia /Stipa comata, is also found adjacent to the site and is lowest in value of all vegetation communities present (Lindauer, et al., 1982). Within the overall landscape, this site is currently of low value to most wildlife species listed. Occasionally wildlife wanders through, around or passes over the site. Grazing by mule deer or elk on perimeter vegetation is possible during moments with low human activity in the immediate vicinity. Very limited, insignificant grazing by mule deer was evident at the time of inspection. Most evidence was of mule deer wandering through, i.e., tracks. Similar habitat to that which has been developed is in fair to good supply locally. Although several well pads and small and large pipelines are presently mixed throughout the local landscape, wildlife has been observed to be habituated to the current level of human activity in the area. Observations of wild turkey, mule deer and bald eagle activity during heavy periods of human activity have been made. During times of peak human activity, numbers of wildlife will be reduced in the immediate vicinity. Although wildlife, including megafauna, has obviously habituated to the level of activity, wildlife use is generally diminished by the existence of the facility and surrounding developed environment. Relatively normal use is not excluded in nearby, undisturbed terrain and habitat. Wildlife Mitigation and Management Recommendations Improve undisturbed sagebrush shrublands. Greater than 99% of the Middle Fork Compressor Station Expansion site is developed. It is a relatively small site, nine acres around the compressor station and electric substation and 18 acres of adjacent high -use staging and storage compared to the surrounding landscape of NPR of 44,000 acres. One strategy to mitigate for the loss of wildlife habitat from development of the site is to improve nearby unaffected sagebrush vegetation communities. Different practices to treat target vegetation communities can be employed. Sagebrush vegetation community improvement is being done under the direction of WWE biologists on several hundred acres on parts of NPR essential for greater sage grouse. Mule deer, elk and many other sagebrush related species also benefit from treatment targeted for a specific species, e.g. brewer's and vesper sparrows, sage thrasher and-mountain-bluebirds. Mitigation treatment practices include mechanical removal of invasive pinyon pine (Pinus edulis) or Utah juniper (Juniperus utahensis) and chopping, grinding or mowing a portion of the older, more senescent sagebrush and other deciduous shrubs (e.g. serviceberry, Amelancheir alnifolia, Gambel oak). Another typical practice is removing or significantly reducing all or a portion of domestic livestock grazing, Minimize footprint of temporary disturbance. Reduce to the minimum level possible all soil disturbing activities. Park construction vehicles on previously disturbed lands during construction to further reduce temporary disturbance. WestWater Engineering Page 4 of 6 pages 2/2/2007 Re- seeding. Temporary disturbances on site have been recommended to be re- seeded with native grasses, forbs and shrubs as well as one introduced legume that is highly wildlife - desirable and non- bloating (WWE, 2007). There is not enough space to be re- seeded to affect wildlife use. However, reducing the potential for noxious weeds is a positive measure for wildlife. Fence Maintenance. The perimeter fence should be maintained in a way to reduce the potential for entrapment from entangling in the fence. Any unnecessary fence is recommended to be removed to reduce potential wildlife entrapment in severe winters. Surface Water or Fluid Ponds. Any surface pond containing fluids potentially lethal for wildlife should be protected by flagging, netting or other means sufficient to deter use by birds or other wildlife (Institute for Land Rehabilitation, 1978). REFERENCES CDOW. 2007. Wildlife species occurrence. State of Colorado, Dept. of Nat. Resources, Colorado Division of Wildlife, Denver at http:// ndis. nrel .colostate.edu /wildlife.asp. Institute for Land Rehabilitation. 1978. Rehabilitation of western wildlife habitat: A review. FWS /OBS 78/86. Utah State Univ., Logan for: Dept. Int., Fish and Wildlife Service Office of Biological Services Contract No. 14 -16- 0008 -2110, Fort Collins, CO, 238 pp. Lindauer, I.E., C.E. Olmsted III, W.A. Kelley, and W.F. Grey. 1982. Terrestrial ecosystems of northwest Colorado: an annotated bibliography and vegetation classification. State of Colo., Dept. Nat. Res., Div. Wildlife., Eco. Services Section, Denver, 123 pp WWE. 2007. Middle Fork Compressor Station Expansion integrated vegetation and noxious -weed management plan. EnCana Oil & Gas (USA) Inc., Parachute, CO, 11 pp. WestWater Engineering Page 5 of 6 pages 2/2/2007 HFP ACOUSTICAL CONSULTANTS INC. February 13, 2008 Mr. Preston Nelson EnCana Oil & Gas (USA) Inc. 2717 County Road 215 Parachute, Colorado 81635 Re: Environmental Sound Level Measurement Survey Phase III Middle Fork Compressor Station - EnCana Oil & Gas (USA) Inc. Garfield County, Colorado HFP File No. 6216 -2 Dear Mr. Nelson: Per your request, HFP Acoustical Consultants Inc. (HFP) has conducted an environmental sound level survey for the Middle Fork Compressor Station in Garfield County, Colorado. The survey results confirm that the existing facilities are in compliance with the Colorado Oil and Gas Conservation Commission (COGCC) noise regulations. The attached summary sheet can be a standalone document that you can submit to the county. Please review it and let us know if you have any comments. Notes: Section 802(c)1 of the COGCC regulation states the following: Noise levels from oil and gas facilities located on surface property owned, leased or otherwise controlled by the operator shall be measured at three hundred and fify (350) feet or at the property line, whichever is greater. The property lines are the greater distance in this case, so those are the sound levels reported in our data sheet. We have noise data collected closer to the units, and can supply that upon request. In anticipation that Garfield County would ask for sound levels at nearby residential locations, we have also included measurement data collected near the two closest houses. The houses are over five miles from the compressors, and the regulations suggest that this condition might qualify as "light industrial" (70 dB(A) daytime and 65 dB(A) nighttime) under Section 802(c): In remote locations, where there is no reasonably proximate occupied structure or designated outside activity area, the light industrial standard may be applicable. This concludes our currently authorized service. Please call with questions or comments. Sincerely, HFP ACOUSTICAL CONSU.o�L T ANTS INC. Ronald R. Spillman, P.E. Attachments: Garfield County, Colorado: Environmental Sound Level Survey Report Map 1 6001 Savoy Drive, Suite 115 Phone: 713.789.9400 #1140, 10201 Southport Road S.W. Phone: 403.259.6600 Houston, Texas 77036 Fax: 713.789.5493 Calgary, Alberta, Canada T2W 4X9 Fax: 403.259.6611 l HFP Acoustical Consultants Inc. 6001 Savoy Drive, Suite 115 Houston, Texas 77036 1713) 789 -9400 Page 1 of 1 Client: EnCane Oil & Gas (USA) Inc. Project: Middle Fork Compressor Sta. Location: Garfield County, Colorado Report: Tim Simmons Date: 2/13/2008 GARFIELD COUNTY, COLORADO: ENVIRONMENTAL SOUND LEVEL SURVEY REPORT General Information Sound levels were measured at four locations as near as possible to the property lines at the EnCana Middle Fork Compressor Station site. In addition, measurements were made near the two residences closest to the compressor equipment. Map 1 shows the measurement locations. GPS coordinates are given below. The sound survey was conducted to determine if the compressor station is currently in compliance with COGCC noise regulations. The area is designated as "Residential/Agricultural/Rural," and as such is subject to allowable noise limits of 55 dB(A) during the 7am to 7pm period and 50 dB(A) during the 7pm to 7am period. The compressor station was completely inaudible at all of the property -line and residential positions. The measured sound levels were under 50 dBA at all locations except P4, where a nearby drilling rig was the dominant sound source. These measurements show compliance with the daytime and nighttime limits. EnCana ran as many compressor units as possible during the sound level testing. Four of five 7500 hp electric -drive units were running. Thus 30,000 hp out of a total of 37,500 hp was in operation. Using a conservative adjustment factor of 10 log (37,500/30,000) = 1 dB, we would anticipate that the total station noise contribution would have been approximately 1 dB(A) higher if all five compressors could have been run simultaneously. However, because the compressor station was completely inaudible at all of the property -line and residential measurement locations, it would be unnecessary and inappropriate to add this adjustment to the measured environmental sound level values. Due to contamination from traffic noise in some measurement areas, the durations of the readings ranged from 30 seconds to 5 minutes. All measurements were sufficient to properly characterize the environmental sound conditions while minimizing traffic interference. Environmental Sound Conditions at Each Measurement Location Sound Level, # Audible sound sources P1 37.5 _ Nearby ddlding rig. Compressor station inaudible. P2 45.9 Nearby drilling rig. Compressor station inaudible. P3 35.3 Drilling rig and birds. Compressor station inaudible. P4 56.8 Nearby drilling rig. Compressor station inaudible. Rf 41.8 Distant traffic. Compressor station inaudible. R2 42.8 Distant traffic and nearby drilling rig. Compressor station inaudible. Weather Conditions Temperature 15 - 19 degrees F 39° Humidity Wind Dir 60 -70 ENE 108° 02' 21.5" Wind Speed 0 -7 mph 13:31 Sky overcast Snow, approx. 3 -5ft., top surface granular 108° 06' Ground P2: Property line, 8000 ft NORTH of compressors P3 I1 Larson Davis Sound Level Meter, Model 824, SN A0917. Current lab certification. Field calibrated before/after. 1 Bruel & Kjaer 4231 Calibrator, SN 1759705, with current laboratory certification Measurement Equipment Measurement Location Information # Date and Time North West Description P1 2/7/2008 12:02 39° 35' 10.5" 108° 02' 21.5" P1: Property line, 18300 ft EAST of compressors tau distances are approximate/ P2 2/7/2008 13:31 39° 36' 08.0" 108° 06' 18.1" P2: Property line, 8000 ft NORTH of compressors P3 217/2008 13:45 39° 35' 21.0" 108° or 49.6" P3: 8200 ft WNW of compressors (property line is farther west, inaccessible) P4 2/7/2008 18:54 39' 34' 29.2" 108° 06' 35.0" P4: Property line, 2700 ft SOUTH of compressors RI 2/7/2008 19:08 39° 30' 35.3" 108° 07' 34.1" RI: Nearest residence, 5.0 miles SOUTH of compressors R2 217/2008 19:18 39° 29' 56.6" 108° 07' 16.2" R2: 2nd nearest residence, 5.7 miles SOUTH of compressor EnCana MFCS Phase III_Sound Survey Report ytxls V1 1018101 HFP Acoustical Consultants Inc. Houston - Calgary MAP 1 EnCana Di! & Gas (USA) Inc. North P ath teanJ Story C,sk,, nerd don ' 4, :it:‘!„." • 1111. North Parachute Ranch (NPR) Reclamation Plan 1:t?■ " • F ^ *14'. • ' TABLE OF CONTENTS IN I RODUCTION ... 1 BACKGROUND .. 1 Climatic Zones within the NPR 1 Upper Zone ' Middle Zone ? Lower Zone 3 RECLAMATION CHALLENGES AND AVOIDANCE RECOMMENDATIONS 5 RECLAMATION CONSIDERATIONS.. 5 Timing of Re- vegetation Work.._ 5 Topsoil Handling •••• 6 Use of Fertilizer 6 I,se of Mulch 7 Use of Certified Seed 7 Harvesting Local Seed ........ 7 Seed Testing 8 Inoculation of Legumes 8 Inoculation of Sterile Suils .............................. S Determination of Pure Live Seed (PLS) ratio. 8 SEED MIX] LRE RECONINIENDATIONiS.. 9 Reclamation Monitoring 11 Weeds 12 REFERENCES 16 INTRODUCTION This document is a reclamation guide for use in restoration of hinds on Encana's North Parachute Ranch. where oil and gas development activities have disturbed the surface by the construction dwell pads. roads. and pipelines. Encana has asked WestWater Engineering to provide recommendations that will facilitate initial re-vegetation and re- establishment of natural succession of native plant species. This plan is based on the combined knowledge of WestWater's biologists (Michael W. Klish, Rusty Roberts and Bill Clark), who have personal experience in the project area vicinity that spans more than 30 years each, and available literature provided in the reference section. Eneana's land use objective for the North Parachute Ranch is to re- establish a self - sustaining vegetation cover integrated with the surrounding ecosystems. The plan is a "working document" and subject to amendment and revision based upon new information and changes in land use at NPR. The recommendations included herein apply to disturbances on upland plant communities. Recommendations for wetland habitats are not included as disturbance to these plant communities are expected to be minimal. This document provides recommendations for the t'ollowMg major subject areas: (I) Reclamation Challenges and Critical Arca Avoidance (2) Reclamation (3) NPR Seed Mixtures (4) Reclamation Monitoring BACKGROUND Climatic Zones within the NPR There are three climatic zones within the NPR and are referred to as the Upper, Middle and Lower Zones. Similar precipitation patterns, soils and plant corntnunities exist within the three zones. The Upper Zone consists of lands above the rimrock escarpment of the Roan Plateau at elevations between 7,500 to 5,500 feet; excluding slopes greater than 20 %, south facing areas. The Middle Zone consists of lands between the escarpment of the plateau to the toe of the slope along the valley floors at elevations between 7,500 and 6,000; including steep, south facing slopes above 7,500 feet, The Lower Zone consists of the lower terraces and ltloodplains along the valley bottoms of the major drainages below elevations of 6,000 feet. The location of NPR is shown on Figure l (attached), a 2005 aerial photo showing the general locations of the Upper, Middle and Lower Zones. NPR Reclamation Plan 1 May 2006 Upper Zone The Upper Zone receives 16 to 25 inches of annual precipitation. A majority of the annual precipitation is received duffing non-growing season (late fall: v +inter). Primary- plant communities in the [Upper Zone are Mountain Big SagebrusluWheatgrass and Upland Deciduous ShrubliVheatgrass ahrublands with sinaller occurrences of Aspen and Douglas Fir forests and riparian shrub. tree and wetland habitats. The plant communities in the Upper Zone have the greatest diversity of plant species. Most of these: specie have adapted mechanisms for establishment and survival in the presence of the competition exerted by other species in the community. These communities are dominated by short -lived cool season bunch grasses, which are an important Rector in providing interspaces for establishment and maintenance of forts and shrubs within the community. Some of the major species in the Upper Zone are listed in the following table. Major Native Plant Species within select Upper Zone Forbs Plant Communities Shrubs Grass /Grass like Letterman Needlegrass Mountain Lupine Mountain Big Sagebrush Colombia Needlegrass Silky Lupine Rocky Mtn. Penstemon Antelope Bitterbrush Mountain Snowberry Low Kabbitbrush Slender Wheatgrass Mountain Brome Watson Penstemon Nodding Brome , Sulphur Buckwheat American Vetch Utah Serviceberry Green Needlegrass Gambel's Oakbrush Idaho Fescue Western Yarrow Chokecherry Elk Sedge Many- Flowered Phlox Red Elderberry Basin W ildrye Arrowleat balsantl'oot Blue Wildrve Upper Zone Summary Soils within this zone are primarily loam textured soils within the Parachute - Rhone- [rigui series. These soils are mostly well - drained, cool soils with dark - colored, organic -rich surface layers derived froin shale and sandstone. Soil textures above the nrn are generally loarn with loam to clay loam sub -soils and range in depth from <20 "on ridges to X60" in swales. All of the upland soils above the rini are in low to medium erosion classes (BLM, 2004, Fox, et al., 1973). Middle Zone The Middle Zone receives 13 to 14 inches of annual precipitation. A majority of the annual precipitation is received during non - growing season (late fall,'winter). A significant portion of this zone consists of unstable slopes that are relatively barren of any vegetation. According to Fox, et al., 1973, these barren slopes are fairly erosion resistant if undisturbed. Primary plant communities on more stable slopes are Eiunchgrass Forb Open Grassland, Upland Deciduous Shnib- W'heatgrass shnihland.. Pinyon;Juniper woodlands and Douglas Fir forests. These communities are dominated by cool season bunch grasses. NPR Reclamation Plan 2 May 2006 Major illative Plant S ecies within select Middle Zone Plant Communities Grass /Grass like Forbs Shrubs Bluebunch Wheatgrass Fringed Sage (Half-Shrub) Watson Penstemon Utah Servicebcrry Mountain Big Sagebrush Indian Ricegrass Thickspike Wheatritrass Sulphur Buckwheat Antelope Bittcrbrush Mountain Mahogany ('ramh eI'c (iakhncsh Green Needlegrass Western Yarrow Junegrass Lewis 1-lax Basin Wildr-ye Silky Lupine Utah Sweetvetch Mountain Snowberry Low Rabbi thrush talk Sedge 4liddte Zone Summary The area below the rim encompassing the cliffs, talus and steep colluvial slopes at the base of the cliffs are derived from the Green River shale. Below the cliffs and talus is a zone of soils formed from col luvium and Wasatch formation. Soils are shallow, poorly developed and there arc many rock outcrops and badlands. Badlands are steep, nearly barren areas dissected by many ephemeral drainages. Badlands of the Wasatch Formation content and are calcareous. Lower Zone Soils on the upper slopes of this zone have a thin, organic -rich surface layer and little development of soil horizons. Soils on lower slopes are shallow to moderately deep and are well - drained. Surface texture is loam, clay loam, or silty clay loam with variable amounts of gravel, cobbles and boulders, talus slopes and colluvial slopes below rock outcrops. Soils are moderate to highly alkaline. Sub -soils usually have higher clay Erosion hazard is usually severe (BLM, 2004). The Lower Zone receives 10 to 13 inches of annual precipitation. A majority of the annual precipitation is received during non- growing season (late fall 'winter). This zone contains some of the most arid sites. Primary plant communities in the Lower Zone on benches and terraces are Wyoming Big Sagebrush.'Wheatgrass shrublands grading to salt desert shrubs like fourwing saltbush or shadscale on the most arid sites. The tloodplain communities include Basin Big Sagebrush,'Grcasewood shrublands on old floodplain terraces and streantside riparian woodlands with cottonwood or box-elder habitats. Cool - season bunchgrasses or cool- season sod - forming grasses or both dominate plant communities in the Lower Zone. NPR Reclamation Plan 3 May 2006 Major Native Plant S ecies within select Lower Zone Plant Communities Grass /Grass like Forbs Shrubs Western Wheatzrass ' Floods Phlox Wyoming Big Sagebrush Basin Big Sagebrush Indian Ricegrass Scarlet Globemallow Needle-and-1 hread brass Utah Sweetvetch Greasewood Bottlehtvsh Squirreltail Silverleaf Lupine Rubber Rahhithrush Junegrass Lewis Flax Antelope Bitterbrush Sandberg Bluegrass Longleaf Phlox Low Rabbitbtush Rluehunch Wheararass Thickleaf Penstemon Broom Snakeweed Basin VvIldrye Winterfat Sandbar willow Shadscale Saltbush Peachleaf willow Four Wing Saltbush Riparian Ilabitat in the Lower Zone Streams are narrow and low and h igh points in the annual hydrograph are widely divergent. Riparian plant communities below the cliffs arc deciduous woodlands on lower stream terraces and floodplains dominated by Fremont cottonwood at tower elevations and narrowleat and box - elder at higher elevations up to the escarpments. Mature box -elder woodlands with a dense understory of shrubs including river birch, alder and red -osier dogwood dominate the tower West Fork immediately below the West Fork Falls. The East Fork woodlands may include Douglas fir. Woody plant diversity is greatest in undisturbed riparian habitat in this zone. Major Native Plant Species within select Lower Zone Riparian Communities Grass /Crass like Forbs Shrubs/Trees Inland salterass Western white clematis Fremont cottonwood Foxtail barley Marsh -elder Narrowleat cottonwood Arctic rush Wild licorice Box -elder Switchgrass Wild mint Black chokecherry Western Wheatgrass Brook cinquctoi l Skunkbush sumac Prairie cordgrass Canada goldenrod Wood's rose Golden currant Sandbar willow Peachleaf willow Bebb-willow Lower Zone Summary Soils in the lower Lcnte are calcareous, moderate to strongly alkaline, some highly saline, Wants and silty clay loams on benches, terraces and alluvial fans. Floodplain soils are sandy loam or loam stratified with sand, gravel or cobbles derived from shale or sandstone. Soils formed in the alluvium are derived from sandstones, shales and marls and appear on benches, terraces, alluvial NPR Reclamation Plan 4 May 2006 fans and tloodplains in the Lower Zone. Surface texture ranges horn loans and sandy Ioarn to clay loam with sub -soils of sandy loan] to clay (Fox. et. al 1973 and f3LM, 2004). RECLAMATION CH.tLLE\CES AND AVOIDANCE RECOMMENDATIONS North Parachute Ranch presents extreme reclamation challenges from a broad array ofclirnate and gcomorphoiogieal factors inherent to the site. These factors often act synergistically and increase the negative effects exponentially. These factors include: • Steep slopes and potential for soil movement. • Effective soil moisture issues including timing of seeding to coincide with natural precipitation. • Difficulty in re- contouring to blend with extreme slopes of natural topography. • Thin soils due to infertility from slope, exposure and soil source materials. • Slumps (instability, difficulty in holding slopes). • Difficulty preventing establishment of noxious weeds in disturbed land. • Riparian areas especially those dominated by mature cottonwoodsibox- eider•:shrubs (due to wildlife and water quality value and long -term needed to establish large trees). Such areas, ifdisturbed, are fiery likely to require rirore time and expense to effectively reclaim]. For example, riparian woodland and shrubland disturbances may require installation of live plant materials in the form of containerized trees and shrubs. Installation and three years of careful oversight and watering of these woody species to insure survival is far more costly than disturbance on sites, which can be successfully re- seeded. In addition to susceptibility to erosion and sediment problems. difficult, listed noxious weeds also present a reclamation challenge of huge proportions. For these reasons, it is recommended livestock grazing be postponed indefinitely. Canada thistle on the West Fork and houndstongue on the East Fork seriously threaten riparian plant communities. Both problems are exasperated by grazing of livestock upstream from NPR property. Prudence suggests reducing the problem as much as passible and one technique for slowing the spread of invasive weeds is to remove livestock. Livestock decrease native plant abilities to compete with invasive species. Livestock can physically move weed seeds around the property in their coats or by ingesting and excreting viable weed seeds. RECI.A\IATION CONSIDERATIONS This section provides recommendations for actions that should be taken in conjunction with seeding of sites undergoing reclamation. Timing of Re- vegetation Work Tithing of re- vegetation is critical to the success of the work. Replacement of topsoil should occur just prior to re- seeding to prevent early germination and establishment of highly competitive annual weeds. In nearly all cases, re- vegetation should occur as quickly as possible NPR Reclamation Plan 5 May 2006 after topsoiling, in order to maintain soil nutrients and microbe levels, discourage weed invasion. and control erosion. Re- seeding should be timed to coincide immediately prior to the season of greatest precipitation, late fall. winter. Seed of many native plant spe=cies require a period of freezing temperatures prior to germination which ensures the seed wil l germinate in spring when soil moisture conditions are optimum for establishment and survival of the seedling. Also, several native species, such as big sagebrush. begin their slow germination process under snow cover. Ideally, topsoil replacement should occur in late August and September followed by re- seeding in late September to early Decetnber prior to freezing soil surface. if re- vegetation occurs too early, seeds are subjected to unnecessary exposure to seed predators and spoilage. If it occurs too late (spring planting), seeds and plants may encounter insufficient moisture to germinate or to survive after germination, and will be faced with higher competition from annual weeds. Topsoil Handling Proper handling and storage of topsoil is critical to successful re- vegetation, especially in the case of re- establishing important native plant species on disturbed areas. The topsoil contains soil microbes (bacteria, micorrhiza, invertebrates) and seed banks of viable seed for the native plants present on the site. Many native plant species depend upon the activity of soil microbes for germination in some instances and for establish and survival of most seedlings. Topsoil is usually stripped from a site and stored in the smallest place possible in deep, unstable piles. Stockpiling topsoil in deep, unstable piles for long periods (over 30 days) results in the loss or limitation of topsoil microbes and viable seed. This is especially so where soils are stockpiled more than several feet in height and biological activity is diminished from lack of oxygen. Topsoil should he protected from erosion and weed invasion. Topsoil should he stockpiled in piles no deeper than 2 feet with stable slopes and be positioned to minimize exposure to wind and water erosion. Topsoil piles stored for longer than 30 days should be immediately seeded to provide cover to reduce erosion. provide competition for weed species, and to maintain viability of the soil fungi and microbe communities. Several fast germinating sterile cover crops ("Regreen" and "Quickguard ") are commercially available that should be used for short period storage oftopst iI. Topsoil stored for more than one growing season should he seeded with one of the recommended seed mixes based upon the zone the site is in. Using the recommended seed mixes on long-term storage piles will help maintain biological activity and provide a seed bank of viable seed. if long -term stockpiling or deep stockpiling can not be avoided, application of micorrhizal inoculants (see section below) may be beneficial. Use of Fertilizer Use of fertilizer should not be used in the reclamation of arid or semi -arid sites. These areas are typically at high risk of invasion by exotic annual weeds, almost all of which are favored by higher levels of nitrogen. Native western species are well adapted to the low fertility of soils in these areas. There are many cases of severe weed infestations, which are directly attributable to NPR Reclamation Plan 6 May 2006 addition of nitro�tten. In addition to the considerable cost incurred, the routine use of fertilizer may well trigger problems with undesirable annual invaders, which can be essentially impossible to correct. Use of NIulch Mulch should be used only where there are specific indications for its application, and not as a routine element in reclamation. It may be useful in wetter areas or on extremely steep areas where severe erosion potential exists. On drier upland areas there are a number of potential prubleuns. These include: wicking (A-soil moisture leading to increased evaporation, alteration of carbon: nitroizen ratios, attraction of rodent and invertebrates to seed and seedling predators, and plant competition from grain or weed seeds in the mulch. VYhere mulch is used, it is imperative that it be retained either by mechanical crimping, application of a tackifier, or with netting. Thew materials and the time required for their application add substantially to reclamation costs. Use or Certified Seed The two types of certified seed are "Blue Tagged Certified Seed" and "Yellow Tagged Source Identified Sccd ". Certified Seed ( Blue Tag): Seed Certification is the means of maintaining the pedigree (genetically pure seed{ of a specific variety of seed. Each state has a seed certifying agency or crop improvement association that certifies seed. Blue Tagged Certified Seed must meet high purity and germination standards and have a low weed content. usually Tess than 0.25 percent. Blue tagged certified seed can not contain any prohibited noxious weeds of the state of certification Many native species are now avnil,thle3 in certified cultivars and in most cases the certified cultivars are lower cost. Source Identified Seed (YeI ow Tag): There is a strong marker for native plant materials, but there may nut be certified ecotypes available due to a lack of breeding, low supply, or high cost to produce, or unreliable demand. In most cases, native plant material should be acquired from harvest areas with the same or higher latitude of the area of intended use. State seed laws only require that the actual state of on sin be on the label. To receive seed from the area you designate, it is advisable to request "Source Identified Seed" in order to ensure that a certification agency has verified the exact location from which the seed was harvested. Source Identified certification is in place in Colorado, New Mexico, Utah, Wyoming and Montana. Yellow tags do not guarantee that the seed is tree of noxious weeds. Buyers should refer to the vendor's label for analysis and weed content, or better yet, test the seed themselves. Harvesting Local Seed Plant species commonly display considerable site adaptation and variability. Thus seed collected far from its eventual planting site often does less well than seed of the same species collected closer to the planting site. Most professional seed suppliers record the collection site, and it may be possible to choose seed that is from locally adapted plants. l f such seed is not available, the possibility of contracting with collectors to obtain local seed should be investigated. NPR Reclamation Plan 7 May 2006 Seed Testing Testing seed is the only way to insure the quality of the seed (purity and viability) and that no undesirable species are present. Purity tests will show the percentages of crop, weed and inert matter (material other than seed such as stems or chaff}, and show if the percentage of each species in the mix meets the standards ordered. The teams germination and viability are sometimes used interchangeably, but do not have the same meaning. A germination test will determine how seeds perform under favorable conditions; however, some seeds are dormant and do not genttinate even though they are still alive. Dormant seeds have the potential to germinate if dormancy is broken, usually through time and,or physiological stitnulus. A viability test will show the sum of the percent germinated and percent dormant seeds in a seed lot, providing information on the potential germination of the lot. Proper seed sampling is very important. The test results received can be no better than the sample sent in. Samples should be sent to a seed lab that tests according to the standards established by the National .Association of Official Seed Certification Analysts. Inoculation of Legumes Most legume seeds should be treated with commercially available Rhiaobitort inoculants to ensure that they are able to make best advantage of their capabilities for nitrogen fixation. Legumes included in seed mixes are: American Vetch, Cicer's Milkvetch, Saintbin, and Utah Sweetvetch. Inoculation of Sterile Soils Arbuscular mycorrhiza (fungi) are components of live topsoil and form symbiotic relationships with plant roots. There are two types and they are especially critical for plants in infertile soils or drought prone areas such as those found on NPR. In most cases on NPR, endomycorrhiza should be used to inoculate the soil since this is the type of fungi that associates with herbaceous and broadleafed woody plants. If coniferous species such as pinyon pine, Utah juniper, or Douglas fir are prescribed in reclamation, an ectomycorrhizal fungi would also be desirable. improperly stored topsoil and areas with little or no topsoil should be treated with commercial mycorrhiza ( Barrow, 1995). Mycorrihizal inoculants are available in two forms' as a granular form for application during seeding, and as a powder for coating of seeds prior to seeding. Granular forms are typically applied at a rate of 20 Ibstacre and powder inoculents are applied to the seed at a rate of 1 Ibsiacre. Vv1 en broadcast seeded, the granular form must be incorporated into the soil with seed by harrowing. Determination of Pure Live Seed (PLS) Ratio Before a seed application rare can be determined it is necessary to determine the percentage of pure live seed (pis) in the supplied seed. Seed may contain weed seed, seed of other species, chaff, sand, and other inert material, and broken seeds. PLS equals the percent purity times the percent germination. Most species are sold on a PLS basis, with the price adjusted accordingly. When given a choice between buying on a PLS or bulk basis, PLS is always preferable. Less NPR Reclamation Plan 8 May 2006 expensive seeds with lower purity and germination may actually cost more or) a PLS basis that: more expensive seed_ SEED MIXTURE RECOMMENDATIONS I he following seed mixtures include native grasses that l) provide good soil protection, 2) are not overly competitive to allow native fork, and shrubs to repopulate disturbed areas, and are commercially available m quantities for small acreage projects. Mountain big sagebrush is not included in the mixture as it is expected to repopulate disturbance from undisturbed stands (anticipated disturbances are small - linear) Savehratsh also requires a different seeding strategy (broadcast on frozen soil or on early snow cover). Activities that result in removal of areas greater than 5 acres ofsagebrush, and are not within 100 feet or-sagebrush to provide seed source may need to have sagebrush included in the seed mixture. Recommended Seed Mix for Upper Zone Disturbances S ecies Slender Wheatgrass Varle (enitivur San Luis Seeding Rate (PLS *!Ac) 3.0 lbs Mountain I3rome Garnet 2.0 lbs Noddine Bronze 2.0 Ibs Idaho Fescue or I ettcrm:an's Needleerass 1.0 lbs Irulti( Rocky Mtn. Penstemon 1.0 Ibs Cicer iv1ilkvetch 1.0 Ibs Utah Sweetvetch 1.0 Ibs Western Yarrow 0.5 lbs American Vetch i 1.0 Ihs 2.0 lbs Antelope Bitterbrush *fire Live Seed Total 14.5 tbs/pls /ac NPR Reclamation Plan 9 May 2006 Recommended Seed Mix for Middle Zone Disturbances Species Variety (eii?tivar) Seeding Rate (P1.S4 /-Ac) Strider Wheatgrass San Luis Bluebunch Wheatgrass or P -7 preferred, Goldar 2.0 lbs Beardless Bluebunch Anatone, or Whitmar Thickspike Wheatgrass Critana Indian Riec_rrasti Ri!mock Rocky Mtn. Penstemon Utah Sweet‘ etch 3.0 lbs 2.0 lbs Western Yarrow Cicer Milkveteh American Vetrh 1.0 Ibs 1.0 lbs 1.0 lbs 0.5 lbs 1.0 lbs 1.0 1hs Antelope Bitterbrush 1.0 lbs Mountain Mahogany 1.0 Ibs Four -wing Saltbush Rincon 1,0 lbs *Pure Live Seed Total 15.5 lbs pls/ac Recommended Seed Mix for Lower Zone Disturbances Variety (cuitiwar) 1 Seeding Rate (PLS * /d0 Species W estern Wheatgrass Needle- and - Thread Grass Arnba 3.0 lbs 1.0 Ibs Thickspike Wheatgrass Indian Ricesrass Critana Rimrock 2.0 lbs 2.0 Ihs Bluebunch Wheatgrass or Beardless Rlrtehunch hpirbs Scarlet Globetnailow Utah Sweetvetch Cicer Niilkvetch I.cwi.; F1i�c P7 preferred, Goldar, Anarnne or Whitmar 1.0 lbs 0.5 ibs 1.0 Ibs 0.5 Ibs 0.5 Ibs Rubber rabbitbrush Four -wino Saltbush Gardner Saltbush and/or Shadscale Saltbush *Pure Live Seed NPR Reclamation Plan W ana I0 1.0 lbs 1.0 Ibs 1.0 lbs Total 14.5 lbs . ls!ac May 2006 Recommended Seed Mix for Lower Zone Ri arian Disturbances Species Crusvoi western titheatgrass ! Variety (cultivar) 1 Seeding Rate (PLS * /Ae) Arriba 3.0Ibs. Blueburich Wheatgrass P -7 2.0 Ibs. Basin \Vildrye tilagnar 2.0 Canby R°tiezrass y.._._ Canhar 0.5 Western N.ar-rotk. ? 0.5 Utah Swectvetch i 1.0 t) s Searle{ (?Iohcmallow 1.0 Fourwini, saltbush Skunkbush Sumac 0.5 *Pure Live Seed Total 11.0 lbslplslacre Attached as an Appendix is the table Reclamation Seed Mix Preferred Species for North Parachute Ranch Plant Communities, EnCana ()il & Gas (USA) Inc. listing potential species suitable for reclamation work on NPR. The list is provided to account for site diversity, unstable prices and ar,ailability of plants useful for reclamation. The table can be used to replace a single, unavailable species or to develop a complete seed rnix. Of great importance is the soil texture adaptation information in the Appendix. Species with wide ranges of tolerance (i.e., species with adaptation ratings of mostly twos .and threes) should be selected whenever possible. It is necessary to adjust the total number of seeds planted per square foot to precipitation, soil moisture and texture. slope and aspect. In the Lower Zone and riparian terraces fewer total seeds per square toot will likely yield better results if seedling plants are not over - whelmed by total numbers of plants. In the Middle Zone of NPR, more seeds can be planted due to generally higher precipitation and better soils in localized areas, while Upper Zone precipitation and deeper soils will successfully sustain h igher numbers of seedlings per square foot. Grasses have consistently performed Netter than tbrhs or shrubs in land reclamation. More species of grasses should be in a rnix than forbs or shrubs except in the case of shrub -only plantings. Species selected and the number of seeds per square foot allocated to that species are based on soil, zone. and experience in similar situations with other plantings. Generally, Lower Zone and riparian area recipes should have fewer species of plants in the mix, e.g. three grasses, one Curb and one shrub for a total of five species in the mix. Middle Zone mixes should have a moderate number of-species of-plants-in a mixe g. - four - grasses, -two- forbs and -ne- shrub - species for a total of seven species in a mix. Upper zones can have as many as nine species in a mix including four grasses, two or three forbs and two or three shrubs. Reclamation Monitoring Success of revegetation should be judged on the of ectiveness of the vegetation for the post - developnten: land use of the property, and the extent of cover compared to the cover occurring in natural vegetation of the area. Projected cover of desirable species should be based an cover NPR Reclamation Plan I I May 2006 tneasured in undisturbed reference areas t not including non- native, invasive species such as noxious weeds). A Natural Reference Area for each zone should be established in order to measure the success of reclamation. Transects would be established in each zone establish for representative plant communities to enable biologists to determine if desirable species have been successfully established. and if they provide sufficient aerial cover to adequately protect the site from erosion and invasive weeds. Reclamation Monitoring will provide evidence of whether a self - sustaining plant community has been established and whether vegetative processes such as reproduction and seedling establishment are occurring. Transects in late spring and late summer will provide identification and contribution ofmost if not all dominant plants found on NPR (Ferchau, 1973). Monitoring results can be compared to studies conducted for oil shale projects in the I970's. Ferchau, 1973 covers the ExxonMtobil property adjacent to much of NPR lands. Environmental studies conducted on NPR by previous owner Union Oil of California should be located and could serve as reference information. Weeds The need to cooperate with adjoining landowners. especially those upstream, to reduce and control invasion of noxious weeds is imperative. Two species, Canada Thistle and Houndstongue are currently invading undisturbed NPR lands on the East and West Forks of Parachute Creek from adjoining private and public lands. Encana needs the cooperation and assistance from adjoining landowners to control this serious problem. A separate integrated vegetation and noxious weed management plan listing and locating all known populations of noxious weeds on NPR is in preparation. NPR Reclamation Plan l? May 2006 Represcntariv.; views of current conditions reflect the diversity of plant communities on NPR. Upper Zone Ridgstop Shruhlands Lower Zone Benches East Fork Parachute Greek Riparian NPR Reclamation Plan Middle Zone cliffs, coiluvium, harsh slope and aspect Riparian Woodlands Below West Fork FaIIa. 13 May 2006 Cross Reference of Names of Plant Species used In Document Common Name I Scientific Name Basin +,l ildrye Levrrtus cinereus Bluebunch Wheatgrass, 64ardless Pseruloroegnerra sprcalo ssp. in €rmis Biuebunch Wheatgrass. Bearded Pseudoroegneria spicata ssp. sprcatcr Blue Wildrye Elvrnies glaucus Botticbrush Squirreltail Canada thistle Columbia tieedlerass Lik Sedze Green Needlegrass Houndstottgue Elvmus €l inoides Cirsium arvense Achnatherum nelsonii sap. krei Curd geyeri Nassella viricltrla Idaho Fescue Indian Ricegrass Letterman Needle:grass Mountain i3rome Needle & Thread Grass Nodding Brom Prairie Juncgrass Cynoglossum ofJ'Icinale Fesruca ldahoensis Achnatherarm hrmenoide,s 4chnatherum leuermanii Bromus marginatus Sandberg Bluegrass Slender Wheatgrass Thickspike Wheatgrass Western Vhcatgrass fiesperosli�?a coinata ssp. comata Bromus anomalies Kaeleria cristara Poa sandbergii American Vetch Arrowleaf Balsamroot Cicer Milkvetch Fringed sagebrush (half-shrub) Lewis Blue Flax Longleaf Phlox Elymus trachvcaultts ssp. trachvcaulus Elymus lanceolalus ssp. lanceolatus Pcr.scojwrurn sniithii 'i Y�ietAie6q.�ivafcidlfr'awt Vicia americana Balsamorrhl_a sagitata Astragalus deer ,1 rtemisia frigida Lamm lewi sii Many - flowered Phlox Mountain Lupine Rocky Mountain Penstemon Satnfoin Scarlet Globeniallow Phlox longivlia Phlox mulriflora Lupintes argenteus ssp. rubricaulis Penstemon strictus Onobrychis vieiijvlier Sphaeralcea coccinea Scarlet Indian Paintbrush Castilleja rnlnlara Silky Lupine Lupinirs serleetrs Silverleaf Lupine Small Burnet Lupinus argenteus Sanguisorba minor Sulfur Buckwheat Thickleaf Penstemon Utah Sweetvetch Watson Penstemon Western Yarrow Eriogvnum umbellatum µPensternon pachvphvllu.s ffedvsorum boreale Penstemon wasionil ,ichillea lanu!osa NPR Reclamation Plan 14 May 2006 Westin Yarrow A \•- irtrinur Indian Pair! brusl Shrubs ,4chilleci millejuliirm ssp. uceidentalis C'trslilleitt Iinaritretnliri Antelope l3rtterbrush l'urshut truleniata Big Sagebrush, Basin ,4rlemisia tridenk.tto csp. tritlrntt t a Big Sagebrush, Mountain ,4riemisict rridentaia ssp. tiwsevana Big Sagebrush, Wyoming .4rtemisia tridenrata ssp. wvoiningensis Broom Snakeweed Xurrihwcephaltin sarothrae I Chokecherry Prunus virginiarra Four -wing. Saltbush Arriples carrescens Garnbel Oak Qitercu c gurnbefii Gardner Saltbush ,4tripler gardneri Chri sorhamnus viscidijlorus Low Rabbitbrush Mountain Snowberry Svinphoricurpas oreophilus Red Elderberry Sarnbucus racernosa Rubber Rabbitbrush Ericameria nauseous ssp. nauseosus Rhus trilobata ssp, trilobata - Skunkbush Sumac Shadscale .4triple:r c•onfert folic: Utah Serviceberry Amelanchier utahensis _ ,Vintertat !1racehortinnikrS4 -ia / nat cr lrtca Box Elder Douglas Fir .ulcer negunda Pseudotsuga merr_esii Narrow leaf Cottonwood Populus «ngusu_jolict NPR Reclamation Plan 15 Nlay 2006 REFERENCES Alstatt. David K. 2003. Soil Surrey of Douglas- Plateau Area, Colorado, Parts ot'Garfield and MCsa Count >. US Dept. Ag., NRC S, 355 pp., 46 Map sheets. Barrow, J.R.. and Bobby D. McCaslin, 1995. Role of microbes in resource management in arid ecosystems. In: Barrow, J.R.. E.Q. McArthur, R.E. Soscbce. and Tausch, Robin J., comps. 1996. Proceedings: Shntbland ecosystem dynamics in a changing environment. Gen. Tech. Rep. [NT -OTR -338. ()_den, UT: USDA, Forest Service., Intermountain Res. Sta.. 275 pp. Colorado Natural Areas Program. 1998. Native Plant Re- vegetation Guide for C'olorado. Caring for the Land Series. Vol, [I[. State of Colo., Division of Parks and Outdoor Rec.. Dept. Nat. Res.. Denver, 25S pp. Ferchau, Hugo, 1973. 'Vegetative Inventory Analysis and Impact Study ot'the Parachute Creek Area, Outfield County. Colorado, ('hap. VI In The Colony Environmental Study, Parachute Creek. Garfield County. Colorado. Vol. Ill, Thome Ecological Institute, Boulder. 77pp. Fox. Charles J.. HD. Burke, .I.R. Meiiman, and .1.1.. Retzer, 1971. Sc,il.s Inventory Analysis and Impact Study of the Colony Property -- Garfield County, CO. Chap. 111, In: The Colony Environmental Study, Parachute Creek, Garfield County, CO., Vol. 111. [home Eco. Inst., Boulder, 52 pp Granite Seed Company, 2004. Granite Seed Catalog. Granite Seed Company, 1697 West 2 100 North, Lehi. UT 84043, 89 pp. N1cNab, W.1-1. and P.E. Avers. 1996. Ecological Subregions of the United States. USDA Forest Service. http:'.•w•wvy.fs.fed.us . landpubs'ecoregions:. Washington. D.C. Scrota, Judith. 2003. Best management practices tier the noxious weeds of Mesa Count), Colorado. Tri River Area, CSU C'oop.Ext., Grand Junction, CO. World wide web publication at: http:; www. colostate. edu, Depts. CoopExt .'TRAlindex.html4rnain.htntl USDA, MRCS. 2006. The PL.t.VT.5 Database, 6 March 2006 tiny: pI.iti •.�«yl e.�,�_). \,I ii1i7:cI [Toot Dahl Baton Rouge. LA 70874 -4490 USA. NPR Reclamation Plan 16 May 2006 Reclamation Seed This table is provided for tlexibili determine the zone which will est or 6 species fur Lower Zone, 35 f Next, determine the species multi and allocate the number of seeds following manner: Grass A = K Shrub G = 5 seedsift`, Shrub !I = Appendix A ix Preferred Species for North Parachute Ranch Plant Communities, h.nCana Oil & Gas (USA) Inc. y in the field to adjust seed mixes to site conditions, cost and availability. "1'o create a custom seed mix for NPR, first blish the total number of species in the mix and total number of seeds /ft- targeted for the zone, i.e., 25 Seed!Itt' and 5 r Middle Zone, and 50 seed,/ & and up to 9 species for Upper Zone (see recommended seed mix section of report). c desired number of seeds urtllat species in the mix. For example:, in .a mix for the Lipper Zone, scleei t or 9 species (each species desired in the,seed mix. (For example, in a 50 seed/ft- seed (nix, each species could he allocated in the eds/ft2, Grass Fi - 8 seeeds/1r, Grass C = 7 seeds/ft-, Gras D - 7 seeds/ft�. Fort Li = 5 seeds/ft', Forh F = 5 seeds/112, seeds!tt' ). Then, use the following formula: "Target no. seeds/ft' (e.g. 5t) = No. seeds ofeach species X 43560 (tt' /ac_) = total no. seeds of each species /ac Total no. seeds ofeach sp cies /acino. seeds /Ih. of that species - Total lbs. of ITS of the species in the mix /ac Continue for each species, Then, add lbs of PLS of e•• ch species = "Total Lhs. of Vlixiac For percent by species in ix, Total Ibs. of each species/Total lbs. of seed (nix - Percent ofeach species m mix. C►nmrr Vamea Botanical rYuntt Ctlltivatrs" Soil 'Texture Adaptation' Coamtentsoahabits, suns, Other factors Sreds/Lb, Cust;lb. NO. 'l.ti'FI. Lbs. P{, Acre /.,in Mit 't•bdtit little needed Seedsiti.'Seedsll.".eedsrri.' Ay 2511211 rata, (a.tSiFi' total fu' Soil-t" 'rrr.;tl C MC M :MI; F Grasses Indian ricegrds s �irlinadieriutt rl ionvrlrrlt es Nefpar 3 3 3 1 t) 2" Waffling depth iri sandy sail 141.1((}() r , Gloria Rirnreek Desert Sleetilebrass Ac hnuil,eram .v )t cin.scorr 2 3 3 1 0 15O.01X) _. Mountain drone lfromirs nruri u ulrrs hkurirar ll I 3 3 I Short lived 40,04X) (;amet Thickspike whratgrass klytarrs !tau Bert inured er /twin Uannuck _ 3 3 _ tl Strurtigly rhiA nt.. lung lived. sod forming 154,000 (•rltana Schwenditnar Inland saltgrass /)isrichliv . jn atrr Suter Primer; Pryor 0 U (1 1 1 2 2 3 3 3 ; 2 3 ? 0 I•ur struttgly s. liiic %ices Strongly rllitunic., tlrulr�hl talcrztnt Shun-111+W 520.000 15h.111►tt 159.000 Slrearlbank wheatgrtss h /iwury kinc•enicaux E,vcunrrr iphilu.e b ermes t. !Tachycardia Slender Whealgraas Revenue San Luis r.—__ i Common Name Botanical Cultivate Soil Texture Adaptation(' Comments on Habits, Soils, Other betars 4rrdYll.b, Until .b. u. -- '1'bd at time needed -- txdsrti.' a 251F't1 t'vrat S l ___ r- i.bs. PI Si Acre h. in Nlis •ed%;ti' ar'3511=1 a (tt ' .ecsift.' r, 't)/Fr ,, (',a1 nnira Redondo 1 3 3 2 () Itin soils, precip. 550,{1111) NI Idaho Fescue re rlicui hid rr�r)»i, ii.>a�ph BR 3 _' 450,01)0 1 15,00U Needle add Itircad tier rz+wi a -. cantata June grass Ku•ieriu n r c ) ff i r M i l l - 0 ® O M M I 0 2, 31' ,400 IMMEIMErreifs - -- Eiriffiriiii 0 011111111 .I railhead 13{0.001' ® Arriba L Barton 0 IIII w od ti ,r+nit 1 10,0001 — _-- (Mlicta Mom/pi/ix lama 0 arm x�u,a, su l 159,1713'! •- urrnira� ut btutcli 47U•Ulii) . V Viva t:arvu sis Iii biucrass )fa Sherman 1 3 1 212i2,U(1U Carib Wu _raa, 3 2 1 - tU "pr�-t:ip 426,000 _ Mullen_ra» ��0- 3 3 2 X90,000 Stinker bI -•rass Pus sr cc -©® ® ©Q lo- .wi • 925,(xtu 13cardkss blunbunch where zrass Pseinluruc meta .y)ieation ine a ®11111©11 0 0U" prrwit„ sod forming I t 7,1(0 1111 MIN l3Iuebunch whcatgrass N.►etrdiuuc' nN)i) Si7ic'UIln1) a heat m AnaIUne IIIMMIllal ' -14" prccip., P -7 widely �� p ' — ®- =�_� _—EM_ — MIIIIIMIIIIIIIIIIIIMIREEMI l3uulrbrusk uirrcttail 1'-7 1 iro kk% 4aladu Elan 1111111911313111111=1 - S •)rubuIU' r kind,. © 3 2 1 Ell l U "',recap. Warn season 529 8,cldo IIIIIIIIMMIIIMIIIIIIMMIIII 11.111_ Il'orbs W. Yarrow .4c•Irilleu mil juiicrnr ,. uc,rident )as 2 EMI 1 0 ut adapted to tine wits Cicer milk vela Aso-walla Lutam. i 2 ! 3 2 1 on-hkw11Rg legume 145,000 Monarch ME II ■ Atrowleafbalsatnrooi Balsoourlriza , oggitrula ME 0 EDO ut etlalnt<d w titre t" oar�e urih Illn Sulphur flower Buckwheat fSriogru))nn to !u- llulxnr 2($) (H1U 11111 ■■■�aa ®a I ®- _ Common N2mIw $ularriea! )Monte Cultivarx" Soil Text ure Ada tatwn` P Comrneets un Habits. Sails, Other factors Seedsll.b. ('o tfl.b. NO. PI.S"/h t,2 I.bs. • I'I >1 ite.TV /o in MIL Tbd at SeedWtt. 2 time !tr, ?S; hl' needed rot al ' - ds/ft.' rr i51P1' lbial Si ds/tt.' . 4r. ilY /ft' 1 utal EMI Mi; t' 0 ®®01111 titue flax L ri 1'nisi/ A y>ar 293.uoo Prairie Astir. Nathan nthe ra ranting rurrcrtc r VIKr ? 3 2 496,000 linral "tia14110111 Uutrl rvrkiv tin: Wahl l;sks 0 2 3 unbtaining Icguric 30. )00 Rrniont - Rock Mtn. Penstetnon Pru.ilemon •sfriches Randers l () 592,000 55,I)0;) 500,000 Small burnett .Sangttisurhu guitar I)clar nom 3 flU 3 1111 3 2 El Namor-American 0 1 onbluacut_ Ie'urae lion lived, good 4rcen Scarlet _lubcnwllow Hairy vetch •street - ruler( coc•cinecr Viola vi liisa vetch Vfivam rita nr na 3 2 on- bk►a me, legume 33,000 Shrubs Basin big sagcbrust Arrrnrrsi :e t ielrnreuu rrideu crru 3 2 4) 2,500,000 Mountain big sagebrush A. t. tom Yana I lubblc Creek 0 Z 3 2 u 2,500,0x0 Cherry Creek Wyoming big sagcbi'ish A. f. wivm rtgenxix Gordon Creek 0 3 3 I 0 2,500,000 Fourwing salibush Ahrplex c• iek eats 3 3 3 3 1 52,000 Shadscale Atri,ler crrr eel, olio 0 2 3 3 1 64,900 Garthiersaltbush AIriplerg r rieri 0 l 2 3 2 111,5to Curt-leaf rain mahogany Cercuc•arpu' lezlifolrtcs 0 2 3 2 0 30,000 Rubber rtbbttbntsh f.ficantowr fiat seavur.sjp. 2 3 3 3 2 41/0.000 Low rabbitbrush (.'hrvsoth mates visricfif eras I 3 3 2 1 782,000 W intertat Kraschenirtrrik via homy Hatch 2 3 3 2 1 56,700 Skunkbush sumac Rimy rriluhut trilohuru 3 3 3 I 0 _ N J 300 15,000 ___ =II _ - ___, aitterbntsh Purshia tr entata La rn 1 3 3 2 0 . "Species so mark %i are introduced, 11 1eCultivars are a variety of aplant veluped from a natural species and maintained ttndercullivaiiun while retaining distinguishing characteristics. C'ultivars may or ntay not be �n production and ate therefore unavai abile. ( Soil Texture adaptation. C- coa , MC - moderately coarse, M = medium, MF = moderately tine. F -= line. 0 = not adapted, I - marginal, 2 - average, 3 = best ((irdnite Seed, 2004). 9Pure Live Seed per square font d 'red in planting for the species selected. Target number of total seeds/112 is 25 /ti' fur Lower Zone and riparian zone. 35 /11' for Middle lone, and 5Wtl' total for Upper Zone planting ' Cool season and bundt grass un otherwise noted in comments ( i.e. *xi titrming or warm season). oitlars are native.