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HomeMy WebLinkAbout07 Grading_Drainage PlanO\,OLSSON ASSOCIATES Grading and Drainage Plan OXY USA WTP LP Pond 13 E/W Centralized E&P Waste Management Facility OA Project No. 013-0655 760 Horizon Drive, Suite 102 TEL 970.263.7800 Grand Junction, CO 81506 FAX 970.263.7456 www.oissonassociates.com OkOLSSON ASSOCIATES Daniel Padilla OXY USA WTP LP 760 Horizon Drive, Suite 101 Grand Junction, CO 81601 Re: Garfield County Grading and Drainage Plan Pond 13 and Storage Area Dear Mr. Padilla: August 13, 2013 Olsson Associates (Olsson) has conducted a review of the existing conditions for the preparation of the Grading and Drainage Plan. The project has been designed in accordance with the Colorado Oil and Gas Conservation Commission (COGCC) standards. The planned use of the site is a water impoundment and storage area. A Reclamation Plan has been prepared by Olsson Associates to accommodate this project. Grading and Drainage Plan 1. Site Map: The proposed site will not differ from the existing site. The existing site features are identified within the Reclamation Plan. 2. Drainage Structures: Additional design is not anticipated since the proposed site and the existing site are the same. Additional disturbance is not anticipated. 3. Topography: The attached exhibit within the Reclamation Plan illustrates the existing topography of the site. Additional grading is not anticipated. 4. Grading Plan: The existing topography is anticipated to remain. 5. Soil Stockpile and Snow Storage Areas: Soil stockpiles and snow storage is not anticipated to differ from the existing use. 6. Drainage Plan: The existing drainage patterns are not anticipated to be modified. 7. Equipment Storage Areas: A proposed use of the facility is for storage. No hazardous material is expected to be stored at the site. Best management practices outlined within the stormwater management plan referenced in the Reclamation Plan will be followed. 8. Temporary Roads: Temporary roads are not anticipated with the development. The existing infrastructure is expected to serve the site. 9. Areas of Steep Slope: The existing side slopes surrounding the site are steeper than 20% and are expected to remain undisturbed. 10. Construction Schedule: A construction schedule is not anticipated since the site currently exists. 11. Permanent Stabilization: The site is currently stabilized through the use of existing vegetation. 760 Horizon Drive, Suite 102 TEL 970.263.7800 Grand Junction, CO 81506 FAX 970.263.7456 www.oaconsulting.com 12. Erosion Control Measures: Erosion control measures are not anticipated since the site is currently stabilized. 13. Estimated Cost: Construction was under an APD. This is an existing site and no new construction is anticipated, 14. Calculations: Drainage design is not included since there are no anticipated changes to drainage patterns. 15. Neighboring Areas: The site is surrounded by oil and gas activity. 16. Stormwater Management: Stormwater management will be in accordance with the previously prepared stormwater management plan referenced within the Reclamation Plan. 17. Stormwater Management Plan: A copy of the permit is included within the Reclamation Plan. 18. Reclamation Plan: A Reclamation Plan is included with the submittal. 19. Hydraulic Calculations: Drainage design is not included since there are no anticipated changes to drainage patterns. 20. Maintenance Requirements: Maintenance requirements are discussed within the stormwater management plan referenced within the Reclamation Plan, 21. Spill Prevention Control and Countermeasures Plan: Not applicable. 22. Additional Information: None. 23. Signature Block: See below. Additional construction is not anticipated, therefore, the previously stabilized areas are not anticipated to be disturbed. If you should have any questions regarding the site observations or the documents provided please let me know. Sincerely, W.Fvr, s � I. A Z� �•i 11CC�� • 0 613 !J Wyatt E. Popp, PEKttE Olsson Associates Senior Project Engineer 760 Horizon Drive, Suite 102 TEL 970.263.7800 Grand Junction, CO 81506 FAX 970.263.7456 www.oaconsulting.com RECLAMATION AND EROSION CONTROL PLAN POND 13 GARFIELD COUNTY, COLORADO PREPARED FOR: OXY USA WTP LP 760 HORIZON DRIVE, SUITE 101 GRAND JUNCTION, CO 81505 PH: (970) 263-3668 CONTACT: DANIEL PADILLA PREPARED BY: OLSSON ASSOCIATES CONTACT: WYATT E. POPP, PE AUGUST 13, 2013 OLSSON ASSOCIATES PROJECT NO. 013-0655 ._OLSSON A 5 S 0 C J A T E S 760 Horizon Drive, Suite 102 1 Grand Junction, CO 81506 1970.263.7800 1 Fax 970.263.7456 TABLE OF CONTENTS 1. RECLAMATION PLAN a. Top Soil Management b. Seeding Procedures and Schedules c. Disturbance Area d. Cost Estimate 2. DRAINAGE AND EROSION CONTROL PLAN a. Drainage b. Erosion Control Measures LIST OF ATTACHMENTS Attachment A Top Soil Salvage Attachment B Regional Drainage Analysis Attachment C Proposed Erosion Control Figure Attachment D Weed Management Plan Attachment E Cascade Creek Stormwater Permit COR -038414 Reclamation Plan Oxy has developed a water impoundment, Pond 13, and storage area. Upon closure of the site, revegetation activities are anticipated to take no longer than forty (40) days weather permitting. Upon closure of the site, the disturbed area will be re-contoured at slopes no greater than 2:1 to catch the existing terrain. Topsoil will be replaced on the disturbed areas. The entire disturbed area will be reseeded with the following seed mixture: Mixed Mountain Shrubland, Including Oakbrush Common Name Scientific Names Form PLS I bs/acre* Elymus lanceolatus ssp. lanceolatus, Sod- Thickspike Wheatgrass Agropyron dasystachyum forming 3.4 Bluebunch Wheatgrass Pseudoroegneria spicata, Agropyron Bunch 3.7 spicatum Bottlebrush Squirreltail Elymus elymoides, Sitanion hystrix Bunch 2.7 Slender Wheatgrass Elymus trachycaulus, Agropyron Bunch 3.3 trachycaulum Canby Bluegrass Poa canbyi, P. secunda Bunch 0.6 Mutton Bluegrass Poa fendleriana Bunch 0.6 Letterman Needlegrass Achnatherum [Stipa] lettermanii Bunch 1.7 Columbia Needlegrass Achnatherum [Stipa] nelsonii, Stipa Bunch 1.7 Columbiana Indian Ricegrass Achnatherum [Oryzopsis] hymenoides Bunch 1.9 Junegrass Koeleria macrantha, K. cristata Bunch 0.1 *Based on 60 pure live seeds (PLS) per square foot, drill -seeded. Double this rate (120 PLS per square foot) if broadcast or hydroseeded. Top Soil Management Topsoil has been reutilized during the initial construction of the site for initial reclamation. During closure of the site the topsoil will be re -stockpiled so that it will not interfere with closure activities. Should the reclamation activities during the closure phase exceed forty (40) days, appropriate measures will be taken to protect all topsoil stockpiles (covering, seeding, windbreaks, etc.). Following final contouring, all disturbed areas will be covered evenly with the stockpiled topsoil. The topsoil will be heavily pocked using the excavator bucket to form an uneven soil surface complex which will aid in revegetation. Soil amendments or import of new topsoil is not anticipated. Review of the vegetation establishment will be required to determine whether soil amendments are required at a later date. (Attachment A). Seedina Procedures and Schedules As recommended grass mixture reseeding will be done in late autumn in order to take advantage of natural precipitation for the region. The reseeding rate should be doubled for broadcast application. Oxy's contractor will utilize a no -till -drill without any soil preparation other than simple grading to slope and waterbars, where applicable. It is anticipated that the disturbed areas will be returned to match the original vegetative state. Seeding will be conducted by means of drilling the prescribed seed mix according to the recommended rate. The seed will be drilled with a common range drill at a depth of 0.25 — 0.5 inch beneath the soil surface. The reseeding will be monitored and reseeded as appropriate until the reclamation standards are acceptable to Garfield County Vegetation Management. The reclaimed site will be monitored for stormwater and noxious weeds. Disturbance area The project has an anticipated total disturbance of approximately 3.25 acre. (141,570 square feet). Engineer's Opinion of Probable Cost Below is a table that outlines the estimated costs associated with the revegetation of the project during final closure. There are no costs associated with the initial reclamation. The estimate is an opinion of probable cost and may vary based upon site conditions encountered or market conditions related to the unit cost. V\,OLSSON Olsson Associates A S S O C I A T E S 760 Horizon Drive, Suite 102 Grand Junction, CO 81506 REVEGETATION COST SUMMARY PROJECT: Pond 13 LOCATION: Garfield County, CO DATE: 8/13/13 Item Description (Source of Cost) Cost/ Acre Garfield County Vegetation Management $2,500 Total Acres 3.3 Estimated Total Cost $8,250 (costs have been provided by Garfield County Vegetation Management) Drainage and Erosion Control Plan The primary disturbance anticipated with the closure Pond 13 is re -grading. Topsoil will be stockpiled so that it will not interfere with closure activities. Should the construction activities during the closure phase exceed forty (40) days, appropriate measures will be taken to protect all topsoil stockpiles (covering, seeding, windbreaks, etc.). The final reclamation plans prepared by D.R. Griffin and Associates, Inc illustrate the proposed final grades. Drainage Nolte Associates prepared the Regional Drainage Analysis. The improvements associated with this project are located within the CA04 and OS18 drainage basins as described within the Regional Drainage Analysis. This project is not anticipated to significantly alter the drainage patterns or flow rates described within the Regional Drainage Analysis. Additional analysis may be warranted due to the nature of construction activity associated with this project. However, it is expected that existing drainage measures will be maintained. Deviation from the Regional Drainage Analysis is not expected, however, if site conditions dictate a deviation then a Colorado Registered Professional Engineer shall be consulted. The Regional Drainage Analysis prepared by Nolte Associates demonstrating drainage patterns for the project area is included as Attachment B. Erosion Control Measures Olsson Associates prepared a Stormwater Management Plan (SWMP) for Cascade Creek Development. It is anticipated that the project will be in conformance with Oxy's SWMP (permit no. COR038414). The Stormwater Management Plan will be revised accordingly. An exhibit demonstrating approximate locations of anticipated erosion control measures is included as Attachment C. Closure will be completed as described in the Reclamation Plan and SWMP. The recommendations associated with the Reclamation Plan and review of the Drainage and Erosion Control Plan were prepared on behalf of Olsson Associates under the supervision of: Wyatt E. Popp, PE Olsson Associates Attachment A Top Soil Salvage R.O.W. BDY. R.O.W. BDY. - NOT TO SCALE - NOTES: 1. SALVAGE TOPSOIL (BULLDOZER BLADE WIDTH) OVER TRENCH AT LOCATION AND DEPTHS IDENTIFIED ON THE CONSTRUCTION DRAWINGS OR AS DIRECTED BY THE COMPANY. STRIP SHALL BE WIDE ENOUGH TO ACCOMMODATE TRACKED BACKHOLE OR WHEELED DITCHER. 2. STOCKPILE TOPSOIL AS SHOWN OR IN ANY CONFIGURATION APPROVED BY THE COMPANY. KEEP TOPSOIL CLEAN OF ALL CONSTRUCTION DEBRIS, MAINTAIN A MINIMUM 1' SEPARATION BETWEEN TOPSOIL AND SUBSOIL PILE EDGES. 3. LEAVE GAPS IN TOPSOIL PILES AT OBVIOUS DRAINAGES. DO NOT PUSH TOPSOIL INTO CREEKS OR WETLANDS, DO NOT USE TOPSOIL FOR PADDING. k AVOID SCALPING VEGETATED GROUND SURFACE WHEN PLACING BACKFILL FROM THE SPOIL PILE. TYPICAL R. 0. W. SECTION BLADE WIDTH TOPSOIL SALVAGE NO. DATE DESCRIPTION .'� DRF CHK APR WRIFFIN&ASSOCIATES, INC. 1414 ELK ST,SUITE202 SCALE.NONE ROCK SPRINGS, WYM01 C&E Na.: 9145 (307) 362-5028 DA TE. NOTES: WITHOUT TRENCH IN ROCKY AREAS ONLY N OTE: Xool%lN%N` 5� WITH TRENCH 1. GENERALLY WHEN A LONG SEDIMENT BARRIER IS REQUIRED, SILT FENCE WILL BE UTILIZED RATHER THAN STRAW BALES AT: A. THE BASE OF ALL SLOPES ABOVE ROADS, SPRINGS, WETLANDS, IMPOUNDMENTS AND PERENNIAL AND INTERMITTENT STREAMS. B. THE DOWN SLOPE ROW EDGE WHERE ANY OF THE ABOVE MENTIONED LOCATIONS ARE IMMEDIATELY ADJACENT TO THE ROW, AS REQUIRED BY THE COMPANY. C. BETWEEN SPOIL STOCKPILES AND FLOWING STREAMS OR WETLANDS WHERE BUFFER ZONE REQUIREMENTS CANNOT BE MET. D. AS DIRECTED BY THE COMPANY 2. THE FOLLOWING SILT FENCE SHALL BE CONSTRUCTED AS FOLLOWS: A. FABRIC USED FOR THE SILT FENCE SHALL BE A "STANDARD STRENGTH" GEOTEXTILE, SUCH AS MIRAFI 10OX OR AN APPROVED EQUIVALENT. B. THE FABRIC SHALL BE CUT FROM A CONTINUOS FABRIC ROLL. C. THE HEIGHT OF THE FENCE SHALL NOT EXCEED 36". D. SPLICES SHALL ONLY BE DONE AT POSTS AND SHALL CONSIST OF A MINIMUM OF 6" OF OVERLAP WITH BOTH ENDS SECURED TO THE POST. E. POSTS SHALL BE POSITIONED A MAXIMUM OF 10' APART. F. POSTS SHALL CONSIST OF 2" x 2" WOODEN STAKES OF SUFFICIENT LENGTH TO EXTEND A MINIMUM OF 12" INTO THE GROUND. G. FABRIC SHALL BE STAPLED OR WIRED TO POSTS, A MINIMUM OF EVERY 9". 3. THE SILT FENCE SHALL BE INSTALLED AS SPECIFIED BY THE MANUFACTURER OR AS FOLLOWS: A. A TRENCH, 4" WIDE AND 6" DEEP, SHALL BE EXCAVATED ALONG THE CONTOUR. THE POSTS SHALL BE DRIVEN INTO THE BOTTOM OF THE TRENCH ON THE DOWNSTREAM SIDE OF THE FILTER FABRIC. THE TRENCH SHALL BE BACK FILLED AND COMPACTED, ENSURING 6" OF FENCE IS BURIED WITHIN THE TRENCH. B. IN AREAS WHERE THE TERRAIN IS TOO ROCKY FOR TRENCHING A 4" GROUND FLAP WITH ROCK FILL TO HOLD IT IN PLACE SHALL BE USED. SILT FENCE SEDIMENT BARRIER ACROSS ROW KEYED INTO DRIVEABLE EARTH BERM r— L— SILT FENCE DRIVEABLE EARTH BERM CONFIGURATION AT VEHICLE CROSSINGS — — — — — — — — — — - X'" MAINTAINED DRIVEABLE a I x EARTH BERM ACROSS I VEHICLE CROSSING g VEHICLE CROSSING —J I r I t PLAN NTS MAINTAINED DRIVEABLE EARTH BERM ACROSS VEHICLE CROSSING STREAM/WETLAND 1s„ PROFILE NTS DRIVEABLE BERM NOTES: A MAINTAINED DRIVEABLE EARTH BERM MAY BE INSTALLED ACROSS VEHICLE CROSSINGS IN LIEU OF SILT FENCE. BERM MUST BE TIED INTO SILT FENCE. ENDS OF SILT FENCE SHALL BE TURNED UPSLOPE WHERE IT TIES IN WITH THE DRIVEABLE EARTH BERM. DRIVEABLE EARTH BERM SHALL BE PLACED SLIGHTLY UPSLOPE OF ADJACENT SILT FENCE - 3. BERM MUST BE MAINTAINED TO ENSURE SEDIMENT TRAPPING CAPACITY. 3. C. SILT FENCES PLACED AT THE TOE OF A SLOPE SHALL BE SET AT LEAST 5' DOWN GRADIENT FROM THE TOE OF THE SLOPE T -BAR OR STAKE SNOW FENCE OR WIRE MESH (WHERE POSSIBLE) IN ORDER TO INCREASE PONDING. EVERY 10'f ARE OPTIONAL FILTER FABRIC A. SILT FENCES PLACED AT THE BASE OF SPOIL STOCKPILES SHALL EXTEND AROUND THE BASE OF THE PILES IN ORDER TO AREA TO BE PROTECTED — — — — — — — CONTAIN ANY SEDIMENTS AND/OR PREVENT FLOW -AROUND. 1d' NDN. B. UPON THE REQUEST OF THE COMPANY., SNOW FENCE, STRAW BALES OR ARE MESH SHALL BE USED IN CONJUNCTION WITH SEE DETAILS BELOW THE SILT FENCE. IF WIRE MESH OR SNOW FENCE ARE USED, THE WIRE SHALL BE ATTACHED Td THE POSTS USING WIRE TIES w OR HEAVY DUTY STAPLES PRIOR TO INSTALLATION OF THE FABRIC. THE WIRE OR SNOW FENCE SHALL BE "KEYED" INTO THE - RUQ N TRENCH AT LEAST 2' AND EXTEND UP THE POSTS TO THE TOP OF THE FABRIC. C. IF REQUIRED, A 15' GAP SHALL BE LEFT IN THE SILT FENCE TO ACCOMMODATE TRAFFIC. HOWEVER, A SECTION OF SILT _ J FENCE, OR A DRIVEABLE EARTH BERM TIED INTO ADJACENT SILT FENCE SHALL BE USED TO CLOSE THE GAP AT THE END OF EACH DAY. THE SILT FENCE USED TO CLOSE THE GAP MUST OVERLAP THE ENDS OF THE ENDS OF THE "STATIONARY" SIDE VI EW SILT FENCE A MINIMUM OF 24" AND SHALL BE "KEYED" INTO THE GROUND THE SAME AS THE FILTER FABRIC ON EITHER OF SILT FENCE SIDE OF THE GAP. N.T.S. 4, SILT FENCES SHALL BE CHECKED AND MAINTAINED ON A REGULAR BASIS. THE DEPTH OF THE ANCHOR TRENCH SHALL BE ADJUSTED IF UNDERMINED. SHOULD INSPECTION REVEAL SEDIMENT LOADING AT OR NEAR 40% CAPACITY, THE SEDIMENT SHALL BE REMOVED AND PLACED IN AN AREA WHERE IT SHALL NOT REENTER THE SILT FENCE IMPOUNDMENT OR A WATERWAY. T—BAR OR STAKE T—BAR OR STAKE FILTER FABRIC —y—FILTER FABRIC S. SILT FENCE SHALL BE REMOVED ONLY AS DIRECTED BY THE COMPANY. 6IT. EROSION CONTROL STRUCTURES AT STREAM AND WETLAND CROSSING SHALL BE INSPECTED DAILY IN AREAS OF ACTIVE CONSTRUCTION. STRUCTURES SHALL BE INSPECTED WEEKLY AT INACTIVE CONSTRUCTION AREAS. STRUCTURES SHALL BE `FILL ITFILL T REPAIRED AS NECESSARY. WITHOUT TRENCH IN ROCKY AREAS ONLY N OTE: Xool%lN%N` 5� WITH TRENCH 1. GENERALLY WHEN A LONG SEDIMENT BARRIER IS REQUIRED, SILT FENCE WILL BE UTILIZED RATHER THAN STRAW BALES AT: A. THE BASE OF ALL SLOPES ABOVE ROADS, SPRINGS, WETLANDS, IMPOUNDMENTS AND PERENNIAL AND INTERMITTENT STREAMS. B. THE DOWN SLOPE ROW EDGE WHERE ANY OF THE ABOVE MENTIONED LOCATIONS ARE IMMEDIATELY ADJACENT TO THE ROW, AS REQUIRED BY THE COMPANY. C. BETWEEN SPOIL STOCKPILES AND FLOWING STREAMS OR WETLANDS WHERE BUFFER ZONE REQUIREMENTS CANNOT BE MET. D. AS DIRECTED BY THE COMPANY 2. THE FOLLOWING SILT FENCE SHALL BE CONSTRUCTED AS FOLLOWS: A. FABRIC USED FOR THE SILT FENCE SHALL BE A "STANDARD STRENGTH" GEOTEXTILE, SUCH AS MIRAFI 10OX OR AN APPROVED EQUIVALENT. B. THE FABRIC SHALL BE CUT FROM A CONTINUOS FABRIC ROLL. C. THE HEIGHT OF THE FENCE SHALL NOT EXCEED 36". D. SPLICES SHALL ONLY BE DONE AT POSTS AND SHALL CONSIST OF A MINIMUM OF 6" OF OVERLAP WITH BOTH ENDS SECURED TO THE POST. E. POSTS SHALL BE POSITIONED A MAXIMUM OF 10' APART. F. POSTS SHALL CONSIST OF 2" x 2" WOODEN STAKES OF SUFFICIENT LENGTH TO EXTEND A MINIMUM OF 12" INTO THE GROUND. G. FABRIC SHALL BE STAPLED OR WIRED TO POSTS, A MINIMUM OF EVERY 9". 3. THE SILT FENCE SHALL BE INSTALLED AS SPECIFIED BY THE MANUFACTURER OR AS FOLLOWS: A. A TRENCH, 4" WIDE AND 6" DEEP, SHALL BE EXCAVATED ALONG THE CONTOUR. THE POSTS SHALL BE DRIVEN INTO THE BOTTOM OF THE TRENCH ON THE DOWNSTREAM SIDE OF THE FILTER FABRIC. THE TRENCH SHALL BE BACK FILLED AND COMPACTED, ENSURING 6" OF FENCE IS BURIED WITHIN THE TRENCH. B. IN AREAS WHERE THE TERRAIN IS TOO ROCKY FOR TRENCHING A 4" GROUND FLAP WITH ROCK FILL TO HOLD IT IN PLACE SHALL BE USED. SILT FENCE SEDIMENT BARRIER ACROSS ROW KEYED INTO DRIVEABLE EARTH BERM r— L— SILT FENCE DRIVEABLE EARTH BERM CONFIGURATION AT VEHICLE CROSSINGS — — — — — — — — — — - X'" MAINTAINED DRIVEABLE a I x EARTH BERM ACROSS I VEHICLE CROSSING g VEHICLE CROSSING —J I r I t PLAN NTS MAINTAINED DRIVEABLE EARTH BERM ACROSS VEHICLE CROSSING STREAM/WETLAND 1s„ PROFILE NTS DRIVEABLE BERM NOTES: A MAINTAINED DRIVEABLE EARTH BERM MAY BE INSTALLED ACROSS VEHICLE CROSSINGS IN LIEU OF SILT FENCE. BERM MUST BE TIED INTO SILT FENCE. ENDS OF SILT FENCE SHALL BE TURNED UPSLOPE WHERE IT TIES IN WITH THE DRIVEABLE EARTH BERM. DRIVEABLE EARTH BERM SHALL BE PLACED SLIGHTLY UPSLOPE OF ADJACENT SILT FENCE - 3. BERM MUST BE MAINTAINED TO ENSURE SEDIMENT TRAPPING CAPACITY. LL 6 SLOPE 3 �� ` �R rp � 2-545 ENERGY EDGE OF DISSIPATER DISTURBED ROW (AS REQUIRED) PLAN VIEWS N.T.S. 1 � 1 FLOW ROCK____� ENERGY 6' DISSIPATER KEY ROCK INTO WATER BAR ROW ROW BDY. BDY, I WATERBAR EDGE OF DISTURBED ROW SLOPE ENERGY DISSIPATER I SLOPE (AS REQUIRED) ENERGY _ - DISSIPATER OR BERM PIPELINE (AS REQUIRED) I STRAW BALE 6 ENERGY .$� DISSIPATER FLOW KEY STRAW BALE INTO WATER BAR FLOW ENERGY DISSIPATER OPTIONS N.T.S. THE OUTFLOW END SHALL BE SLIGHTLY LOWER THAN THE POINT WHERE THE HAY BALES TIE INTO THE WATERBAR WATER BAR X -SECTION DETAIL N.T.S. NOTES: 1. WATERBARS SHALL BE INSTALLED ON THE RIGHT-OF-WAY AND DIRT ROADS AT LOCATIONS AND SPACINGS STATED IN THE BLM R-O.W- STIPULATIONS, CONTRACT SPECIFICATIONS, THE CONSTRUCTION DRAWINGS OR AS DIRECTED BY COMPANY. 2. WATERBARS SHALL BE ORIENTED AS SHOWN OR OTHER PATTERN AS DIRECTED BY THE COMPANY TO DIRECT THE WATER FROM THE SLOPE. 3. WATERBARS SHALL BE CONSTRUCTED AT A 2-5X 4. THE WATERBAR SHALL BE 18" DEEP (AS MEASURED FROM THE TROUGH TO TOP OF WATERBAR). THE TROUGH WILL BE A MINIMUM OF 5' WIDE ACROSS THE WIDTH OF THE ROW. 5. WHEN SO ORDERED BY AGENCY OR LANDOWNER, WATERBARS SHALL EXTEND BEYOND THE EDGE OF THE ROW AS DIRECTED BY THE COMPANY TO DIRECT WATER AWAY FROM THE DISTURBED ROW. NOTES: 6. THE OUTLET OF THE WATERBAR MUST BREAK THROUGH ANY BERMS OR CUT BANKS TO FREELY DISCHARGE ALL RUNOFF OFF THE DISTURBED ROW. 7. IF THE ROW BOUNDARY PERMITS (AND AN ENERGY DISSIPATER IS NOT REQUIRED, THE BERM AND NOT THE TROUGH SHALL EXTEND 5' BEYOND THE EDGE OF TH DISTURBANCE TO ENSURE WATER FLOWING OFF THE DISTURBED AREA DOES NOT RETURN TO THE ROW BELOW THE WATERBAR. S. TRAFFIC ACROSS WATERBARS SHALL BE MINIMIZED AND WATERBARS SHALL BE RECONSTRUCTED IF DAMAGED. 9. DURING REGULAR MONITORING, WATERBARS SHALL BE CHECKED FOR INTEGRITY PROBLEMS. IF NECESSARY, BERMS SHALL BE REPAIRED AND SEDIMENT REMOVED FROM THE TROUGH. 10. WATERBARS WILL NOT BE INSTALLED IN CULTIVATED OR IRRIGATED FIELDS. FLOW ENERGY DISSIPATER NOTES; 1, THE OUTLET SHALL CONTAIN AN ENERGY DISSIPATER IF COMPANY REPRESENTATIVE DETERMINES EXISTING VEGETATION IS NOT SUFFICIENTLY STABLE TO PREVENT EROSION. THE ENERGY DISSIPATER SHALL BE CONSTRUCTED AS FOLLOWS: IF SILT FENCE OR STRAW BALE DISSIPATOR IS USED; • OUTFALL END OF DISSIPATER SHOULD BE LOWER THAN THE POINT WHERE THE DISSIPATOR TIES INTO THE WATERBAR. • SILT FENCE OR STRAW BALE DISSIPATER SHALL BE EITHER KEYED INTO END OF WATERBAR, OR PLACED SLIGHTLY DOWNSLOPE OF WATERBAR. • PROVIDE ENOUGH AREA INSIDE 'L" TO CAPTURE AND HOLD SEDIMENT - 2. TEMPORARY WATERBARS SHALL BE INSTALLED IMMEDIATELY AFTER INITIAL GRADING, AND YNLL BE MAINTAINED THROUGHOUT CONSTRUCTION UNTIL REPLACED BY PERMANENT WATERBARS. TEMPORARY WATERBARS SHALL BE INSTALLED ABOVE STREAMS, WETLANDS, AND ROADS. ENVIRONMENTAL AND CONSTRUCTION INSPECTOR MAY REQUIRE INSTALLATION OF TEMPORARY WATERBARS ON OTHER SLOPES OR AT CLOSER SPACINGS THAN SPECIFIED BELOW IF WARRANTED BY ONSITE CONDITIONS ON A CASE-BY-CASE BASIS. 3. FOLLOWING CLEAN-UP PERMANENT WATERBARS SHALL BE INSTALLED ON ALL SLOPES AT THE SPACINGS SPECIFIED BELOW TO CONTROL RUNOFF. ENVIRONMENTAL AND CONSTRUCTION INSPECTORS MAY REQUIRE INSTALLATION OF PERMANENT WATERBARS AT CLOSER SPACINGS THAN SPECIFIED BELOW IF WARRANTED BY ONSITE CONDITIONS ON A CASE-BY-CASE BASIS. 4. TEMPORARY AND PERMANENT WATERBARS SHALL BE INSTALLED ON ALL LANDS (PRIVATE, STATE, AND FEDERAL) AT THE FOLLOWING SPACINGS; SLOPE (%) SPACING FT < 5% NONE 5-15 300' 16-30 200' >30% 100' PRIVATE & STATE LANDS SLOPE SPACING F 0-2 400' 2-5 300' 5-10 200' 10-20 100' 20+ 50' FEDERAL LANDS 5. SPACING AND OTHER WATERBAR REQUIREMENTS STATED IN THE BLM R.O.W. GRANT STIPULATIONS AND LANDOWNER AGREEMENTS, IF ANY, SHALL SUPERCEDE THE ABOVE. SLOPE SURFACE CROSS SECTION \/\ N.T.S. SPACING DEPENDS ON } SLOPE: SEE NOTES #4 AND #5 BELOW h QP DETAIL 2 N.T.S. ABUTT ADJACENT LOGS TIGHTLY i -SLOPE SURFACE EROSION/SEDIMENT CONTROL LOG ("WATTLE") 8" TO 12" DIAMETER (D) 10' TO 20' LONG 2" MIN TO 113 D BELOW GRADE 1" X 2" X 2' TO 3' WOOD STAKE OR NO. 4 REINFORCING STEEL 2' TO 3' LONG DETAIL 1 N.T.S. NOTES: " 1. EROSION CONTROL/SEDIMENT ("WATTLE") LOGS SHALL BE INSTALLED ON SLOPES AS SHOWN ON THE ALIGNMENT SHEETS, DESIGNATED IN THE PROJECT STORM WATER MANAGEMENT PLAN (SWMP) OR AS DIRECTED BY THE ENVIRONMENTAL INSPECTOR. 2. EROSION CONTROL/SEDIMENT LOGS SHALL BE MADE OF SHREDDED ASPEN, STRAW, OR SIMILAR VEGETATIVE MATERIAL FREE OF THISTLE AND OTHER NOXIOUS WEEDS AND WRAPPED IN TUBULAR BLACK PLASTIC NETTING OR OTHER APPROVED ENCLOSURE. THE NETTING SHALL HAVE A STRAND THICKNESS OF ABOUT 0.03", A KNOT THICKNESS OF ABOUT 0.055", AND WEIGHT OF ABOUT 0.35 OZ/FT. THE NETTING SHALL BE MADE OF 85% HIGH-DENSITY POLYETHYLENE, 14% ETHYL VINYL ACETATE, AND 1% COLOR FOR UV INHIBITION OR OTHER APPROVED COMPOSITION. 3. COMMERCIAL PRODUCTS THAT SATISFY THESE REQUIREMENTS INCLUDE AMERICAN EXCELSIOR LOGS, STRAW LOGS BY GREENFIX AMERICA OR STRAW WATTLES BY CALIFORNIA STRAW WORKS. 4. WHERE DESIGINATED FOR INSTALLATION ON THE ALIGNMENT SHEETS, IN THE SWMP OR REQUESTED BY THE ENVIRONMENTAL INSPECTOR, EROSION CONTROL/SEDIMENT LOGS SHALL BE INSTALLED AT THE FOLLOWING SPACINGS: PRIVATE & STATE LANDS FEDERAL LANDS SLOPE % SPACING FT < 5% NONE 5-15 300' 16-30 2DO' >30% 100' SLOPE % SPACING FT 0-2 400' 2-5 300' 5-10 200' 10-20 100' 20+ 50' 5. SPACING REQUIREMENTS STATED IN THE BLM R.O.W. GRANT STIPULATIONS AND LANDOWNER AGREEMENTS, IF ANY, SHALL SUPERCEDE THE ABOVE. TYPICAL EROSION CONTROL ! SEDIMENTCWATTLE'J LOGS NO DATE DESCRIPTION •� DRF CHK APR WRIFFIN & ASSOCIATES, INC. 1414 ELK ST., SUITE202 SCALE.' NONE ROCK SPRINGS, WY82901 C&E No.: 9167 (307) 362-5028 DATE: Attachment B Regional Drainage Analysis r OS18 I ✓ e�> 7103 6.4 55..0 r J sass s.e I OS17 V 29.6 `m i,,, _-1 790.2 9.6 • i OS20 309.9 3.8 28.6 Ah / �' I ■�� I 918.6 los ONO > _ 1021. 10.8 - 51.7 - r , ,� ■ t"ice \,-v ' .. �i U � U ON0 563.7 6.2 o 766.9 8.3 422 O . ■ GP RIBO i �� CA02 614.5 z2 .. ■ - 481.7 5.3 48.4 � 1 a c ONO G� ■ 23 COMBINED CHANNEL FLOW SUMMARY TABLE RIBO .. 47.3 9.6 ■. ■ �.. ■ 9 .i ��I % } /\ -%�// //��jt `_--���- �\ r , 637 _ AKO 511.0 5.9- L 37.4 ONO r r ' . � � ._ '. � 1y t 765. 18.3 83.5 �r � . car ■ .��' � a,n a [ pr1:P ■ '■ G- OOnt M 3, RIBO p AKO4 11 � 587 G� �� 649.5 7.7 I 36 ........ �:.• - 876.6 - ,<o 6 97 500 - -97 ■ ,� T. EE �a. � ,.m qr3, I•' I 31 1 989.8 7o.e 67.74s - I 5 4 ■ ■ AKO , 79'- ,z` AKO 7 ,n, 481.8 5.2 ) A ONO z^ - 26.3 \ 086. 123 I 79.5 L� I � .� ,�.... / � � � .�„". �. --- '-■_-- - - Combined Outfall 247.8 1143.1 Bowdish Gulch CHART 2B CH BG 01 39.4 231.7 CH BG 02 O 141.7 leo 6 43.9 w,doo 38 62 Conn Creek 54 85 CH Con 01 208.4* 166 CH Con 02 203.5* 9,COd E%AMPLE 11) 456.6* CH Con 04 66.8* 330.1 * CH Con 05 156 142.6 CH Con 06 6,000 D•a, ln.au la.o rwry 6 (2) Baker Gulch CH BAK 01 98.7 400.8 5,000 37.3 218.3 CH BAK 03 13.5 85.5 CH BAK 04 5.9 -1 9 CH Trib 01 16.6 4,000 •JS• 4 Mt 7.2 46.4 CH Tour 0 10.4 1 61.1 13Y Cascade Canyon 3 OOd IMII CH CA 01 26.2 149.6 CH CA 02 a. 123.7 CH CA 03 `I 64 111 1.0 0.4 , 120 e,dd0 I» a.. .., e. 109 •D 1w L.. !. 4, 98 e � 1,000 3, 900 3. a4 900 !Od Y 400 72 Y. 2. i 300 - aa m 2 I,0 Z aC v 200 2 i � I'a 1,5 afP%6/ 34 W W 100 � ae ¢ eon 4 o Z' Z u 42 -in 60 30 = 1.0 1.0 o d1.0 40 1W- 36 30 HW ENTRANCE W SCALE 0 TYPE a 9 33 20 111 30 tet Ylyr..uanlvn, 27 IO 131 h.p.ay s e s 7 7 r 24 .7 e 6 21 3 •sm• 121 a 131 ...Ym 4 n.r ..wr.1ry a n.. • In. 11.0 ..rn... .! .. 19 uluu ru.0o x 15 3 ,0 ! 12 HEADWATER DEPTH FOR C. M. PIPE CULVERTS WITH INLET CONTROL BVRE.V OI PVBLK ROw09 ,.n. 1393 c ONO G� ■ 23 COMBINED CHANNEL FLOW SUMMARY TABLE RIBO .. 47.3 9.6 ■. ■ �.. ■ 9 .i ��I % } /\ -%�// //��jt `_--���- �\ r , 637 _ AKO 511.0 5.9- L 37.4 ONO r r ' . � � ._ '. � 1y t 765. 18.3 83.5 �r � . car ■ .��' � a,n a [ pr1:P ■ '■ G- OOnt M 3, RIBO p AKO4 11 � 587 G� �� 649.5 7.7 I 36 ........ �:.• - 876.6 - ,<o 6 97 500 - -97 ■ ,� T. EE �a. � ,.m qr3, I•' I 31 1 989.8 7o.e 67.74s - I 5 4 ■ ■ AKO , 79'- ,z` AKO 7 ,n, 481.8 5.2 ) A ONO z^ - 26.3 \ 086. 123 I 79.5 L� I � .� ,�.... / � � � .�„". �. --- '-■_-- - - Combined Outfall 247.8 1143.1 Bowdish Gulch CH BG 01 39.4 231.7 CH BG 02 22.3 141.7 CH BG 03 6 43.9 36" 38 62 Conn Creek 54 85 CH Con 01 208.4* 911.4* CH Con 02 203.5* 892.6* CH Con 03 94.8* 456.6* CH Con 04 66.8* 330.1 * CH Con 05 31.4 142.6 CH Con 06 6.6 29.6 Baker Gulch CH BAK 01 98.7 400.8 CH BAK 02 37.3 218.3 CH BAK 03 13.5 85.5 CH BAK 04 5.9 37.4 CH Trib 01 16.6 103.1 CH Trib 02 7.2 46.4 CH Tour 0 10.4 1 61.1 Cascade Canyon CH CA 01 26.2 149.6 CH CA 02 21 123.7 CH CA 03 10.5 64 } 1 I p,.� I ■ p * FLOW RATES MANUALLY ADDED TO /2 ONO11 Z Q§ AKO ■ ESTIMATE LOWER REACHES _ ` 2ss. 151 ; t T0001 , - 1, I - a:r-aE 97.0 z c RIBA BASIN DESIGNATION 32.9 s, - v O. >� 1 920.7 10.4 _ 1 1 U " U ■■ I � st asas.4 25 YEAR BASIN FLOW (CFS) 'Ona 100 YEAR BASIN FLOW (CFS) AREA ACRES 1 - w BG04 OS16 CONO , �,� 6.2 9ssbz / OS01 �o S I- ! 'innac .5 9 _ .7BG02 a , � r�7 '�✓ 4.2 19 706.4 51 7 � � i 39 2 25 6 � /� K C , � ! / %r'!% �' � � 1' r , , � � � �� EGOS i '�- $ l 'L; i7 --- 19 429.3 4.9 s - i.. ■ ��� i /�\�� 1 ' zs, s,rir - ■ OS11 i OS12 t OS02 J ° � ` _:- -_ CHtBGOi`'- -_�_ j' YG02 - , r 948.2 - - 1 382 2 4 ° _ ._J_ 9 wtlish --. G 1cM1 - '1 _ •_ �� / .) % ,' // Mou_1,c , 505 r 27 8 1 / r r - - S ! 513.6 s.2 - _�- - _ ' / ■ 1 e .485.8 6.0 _ G f( •1 \\" 43.9 I �4 Z _ - - ^ C311zI .n ■ j. 1 24, �� � OS03' - BG01 � BG03 ' � OS14 '1 /l..,..m 928.5 1o.a 3s _ .501.2 63 �.`. ■ .,,:�� �� .: ...- 727.6ce 59.5 22, 496.9 ,: e c� R 2 27 5 ... D96w si" , 3 324. OS1 2 1 50.8 �. u y o� ♦ 4 �\ f _ * t �� OS05 ssz.a 6., r` OS07 09�,� ¢ �e - -A. ♦ 5s.t 287.8 3s -.. ^` � ,� ,g,. � ° ♦ 3t3.5 3s s.3 az ■ ■ �� ■ ■ ■�■rr ■ ■ : n 30 425.7 _ vi=e _ � i ' ::. ... __ �� 50804 - .. ;.. _. \�_.. 1 „J �'.a - ����`'7�`''�1,� "�'+�\\`�i` r \�� (C ,E `•%. ,�. �\ rL� �S. �� .�.I/ / \ n 227 REINFORCED CONCRETE PIPE CULVERT CAPACITY (CFS) PIPE DIAMETER HW/D =1.0 HW/D =1.5 18" 6.8 11.0 24" 13.8 21.2 30" 22 39 36" 38 62 42" 54 85 P442" 8" 75 125 CORRUGATED METAL PIPE CULVERT CAPACITY (CFS) PIPE DIAMETER HW/D =1.0 HW/D =1.5 18" 5.6 9.0 24" 11.8 18.5 30" 20 31 36" 32 50 42" 46 73 48" 66 100 Dlei I*..I THE ABOVE TABLES ASSUME A HEADWATER DEPTH TO PIPE DIAMETER RATIO OF 1.0 TO 1.5 AND A PROJECTING PIPE END AT THE INLET. CONSULTATION WITH A CIVIL ENGINEER IS RECOMMENDED FOR LOCATIONS REQUIRING A 36" OR LARGER PIPE CULVERT. LEGEND ■ ■ LIMITS OF DRAINAGE STUDY DRAINAGE BASIN BOUNDARY WITHIN CONN CREEK WATERSHED DRAINAGE BASIN BOUNDARY OUTSIDE OF CONN CREEK WATERSHED ....E � OU G e OS08 I --. 290.7 3.8.. 43.8 , rS iE L ,~ L✓ 5�., r� //r ���� � ,� �� ✓ Rl� r `� r 18 ���C`�\ 0 1000 2050 R0D0 - Ij S.?rhe \. y11 J 1'�1•L ��. o ' j D ..11 ,�/ '^: ��: \�� 1 1 inch = 2000 ft. S- ".( \C 7J /,,., i'. / '. F - � / _yy <i � - .. - - A'��":g; � rr�:,) A.I� � nP a� wr i � t(��� �il✓��� swR'_' - � �- 1• ' 7 DATE: 2'19'06 TIME: 41:16 AM NO. BY DATE REVISIONS: NUMCL11 v0u°NB: OCCIDENTAL OIL AND GAS CORPORATION 1 SERVER: DVS1 LAYOUT: Latl \ FORERUNNER = PATH: N:\DVB0235\CADD\CIVIL (\ ® o o x o x n T. o xNJC= OF SHEETS a DRAWING NAME: ETSD.DWG 3900S.W..S.OMB..#6oa REGIONAL DRAINAGE ANALYSIS SALE PAGE SETUP: ---- LR33W00D, co 80235 VERTICAL: 1"= x DESIGNER: #### PROJ. MGR: #### 303.968.0223 ,/+44L B E Y O N D E N G I N E E R I N G WATERSHED EXHIBIT HORIZONTAL: 1"= 2000' m " CAUTION: The engineer preparing these plans will not be responsible for, or liable for, unauthorized changes to or uses of these QX 8000 S. Chester Street, Suite 200 Centennial, 00 80112 JOB NUMBER Y peons. All manges to the peons must be in writing and must be approved by the preporer of these plans. �P' 909.220.8400 TEl 303.220.9001 FAX WWW.NOLTECOM PREPARED FOR: FORERUNNER CORPORATION DATE SUBMITTED: 12/18/06 DVB0295 Attachment C Proposed Erosion Control Figure \\— I CONCRETE � � v VA VA A ' / ae° PUMP PAD 1 n -- \\ / v_ EXISTING O vA/ A 1 vVAv�' PNSV`111 q WEST POND I / / // // IX \ \ f II AAl \ 0.96± ACRES CENTER POND AREA V A \ f \ \ TOTAL POND AREA: 213± ACRES V \ V A vv NAD 83 POSITION VAl VO VA V A F \ VA 39'32'55.0" NORTH 108'13'01.0" EAST POND 1.17± ACRES I \ / /r' SOLAR PANEL \ \ V vv vvv_— CONCRETE PAD NOTES: 1. BMPs SHOWN ARE APPROXIMATE AND FIELDSHALL CONDITIONSADJUSTED APPROPRIATELY TO X / / ////// ////////N° 2. POND INFORMATION AND DESIGN 1 \ \ \\ PROPOSED STQR`AGE PROPOSED I II I I l/ I/IIIIII I I I A VAA V A \ I V A STORAGE AREA 11 dAA v v A 1.12± ACRES I I I I II I I 11 11111j11 I III II II Il�j IIj111111 1111111 III I v vvvIAA\I II I I II��I IiII1IIII I I II III III I \ \\ 1 11 I IIIIII IIIIIIIIIIIIII Ijlliljl I \\ II 1 1 I IIII Illlillllll II II \ /� II I;I IIIIII I III /I \ I I I I II III IIIIIIII I�111 / I V I �� I I IIII I III I 1111 I I V I V �� I I I II;I II II151 II I\ I I I I III 1i 1111111 I I 11 I I I II I l i i I I I 1 1 1 1 I I I j l I I I I I I I I I I I I I 1 I/ I TI TA 1 / rs \ f I 1\ I t I I I PROVIDED BY D.R.GRIFFIN & ASSOCIATES. 3. REFER TO BMP DETAILS FOR PLACEMENT. 4. BMPs REFLECTED ON THIS PLAN PERTAIN EXCLUSIVELY TO POND CONSTRUCTION. 5. PROTECT EXISTING BMPs AND REPAIR/REPLACE IF DISTURBED. BMP LEGEND FLOW DIRECTION EXISTING STABILIZED VEGETATION DRAINAGE DITCH ,O pO ROCK RUNDOWN SEDIMENT TRAP NO RESPONSIBILITY FOR EXISTING UTILITY LOCATIONS (HORIZONTAL OR VERTICAL). THE EXISTING UTILITIES SHOWN ON THIS DRAWING HAVE BEEN PLOTTED FROM THE BEST AVAILABLE INFORMATION. IT IS HOWEVER THE RESPONSIBILITY OF THE CONTRACTOR TO FIELD VERIFY THE LOCATION OF ALL UTILITIES PRIOR TO THE COMMENCEMENT OF ANY • • below. PRIOR TO DIGGING, GRADING OR EXCAVATING FOR THE MARKING OF 3 a Z LD x� a U 00 a O y to z 0 2 UJ w W �d IY Z U) Z O U) W D_ co O N F— W O F- Q Z J a O 0_ W 0_ J (D J L O r H U) Z O U) W D_ co O N F— O F- Q O Q ? O J O M X O O O r z Z W O Z o � O U J W U - a O drawn by: DJF checked by: CDR approved by: WEP OA/OC by: WEP project no.: drawing no.: date: 06/27/2013 FIGURE 1 Attachment D Weed Management Plan OXY USA WTP LP and OXY USA INC. Subsidiaries of Occidental Petroleum Corporation Noxious Weed Management Plan August 2010 Table of Contents 1. Background 3 2. Compliance Statements 3 3. Contacts 3 4. Locations 4 5. Land Use Objectives 4 6. Weed Management Objectives and Implementation Strategies 4 6.1 Inventory and Monitoring 4 6.2 Prevention 5 6.2.1 Construction Prevention Measures 5 6.2.2 Revegetation 5 6.3 Control and Management 6 7. References 9 8. Local, State and Federal Contacts and Resources 10 NOXIOUS WEED MANAGEMENT PLAN OXY USA WTP LP and OXY USA INC Mesa and Garfield County Operations 1. Background The Colorado Noxious Weed Act (C.R.S. Title 35, Article 5.5) requires that "noxious weeds" be managed on private and public lands. The Act further declares that control of noxious weeds should use methods that are least damaging to the environment but also practicable and economically reasonable. The state requires management of noxious weeds included on one of three lists (see Appendix A): List A — designated for statewide eradication; List B — managed to prevent further spread and, for selected species, designated for eradication in large areas; and List C — of more localized concern, but for which the State will provide education, research, and biological control assistance to jurisdictions that choose to manage the species. OXY USA WTP LP and OXY USA Inc. (individually and collectively referred to herein as "Oxy"), are affiliated companies that separately own and operate certain mineral properties in the State of Colorado. This plan is intended for all Oxy operations in order to comply with all state and federal requirements including the Colorado Noxious Weed Act, Colorado Oil and Gas Conservation Act, Bureau of Land Management (BLM) and Forest Service (FS) National Invasive Weed Strategies, Mesa County and Garfield County weed standards. 2. Compliance Statements Oxy will manage all noxious weeds, as defined by the Mesa County, Garfield County or State Law (CRS 35-5.5), in all newly disturbed project areas using recommendations identified in this plan or those provided by biological consultant at the time of project specific inventories. The term, "disturbed area" includes all access roads, easements, pipelines, special purpose pits, berms, soil stockpiles, well pads, electrical and compressor stations and other structures, and other areas disturbed by project activities. Oxy will immediately report all State List A and List B populations to be eradicated and any other species slated by Mesa and Garfield Counties for eradication upon discovery to the appropriate County designee. 3. Contacts Regulatory Lead: Sean Norris OXY USA WTP LP 760 Horizon Drive, Suite 101 Grand Junction, CO 81506 (970) 263-3628 Regulatory Advisor. Daniel Padilla OXY USA WTP LP 760 Horizon Drive, Suite 101 Grand Junction, Colorado 81506 Phone: (970) 263-3637 4. Locations Oxy has active and inactive leases for gas exploration in the following areas of Mesa and Garfield Counties: • Cascade Creek (Garfield County, Colorado) • Collbran Area (Mesa County, Colorado) Oxy operates on split estate, wholly federal (both BLM and USFS), and wholly private land and lease holdings. 5. Land Use Objectives Oxy conducts natural gas exploration on lease holdings in Colorado. Land uses and types of facilities to be developed include access roads, pipelines, well pads, compressor stations, staging/storage areas for equipment and supplies, and other associated natural gas development activities. Some of the developments are short- term temporary disturbances, such as staging areas and pipelines, while the roads and well pads will be in place for an estimated 20-30 years. 6. Weed Management Objectives and Implementation Strategies The following are the overall objectives of Oxy's weed management plan. Specific actions to be taken to meet these objectives are detailed in Section 6. 1) Inventory and monitor existing noxious weed infestations using GPS or other mapping techniques and consistent field documentation; 2) Prevent new infestations of noxious weeds; 3) Implement Integrated Weed Management (IWM) to control or manage noxious weed populations; 4) Maintain weed inventory, herbicide application and mapping records; 5) Restore disturbed areas to their proper ecological function to protect native plant ecosystems and watersheds from degradation by noxious weeds. 6.1 Inventory and Monitoring Before a new site is developed, Oxy will inventory the site and adjacent areas for noxious weeds, including access roads and other probable weed ingress routes. Noxious weed locations (List A and List B species) will be collected with a GPS unit. Any noxious weed infestations found will be treated before site disturbance, if timing is appropriate. If the season is not appropriate for weed treatment, activities may proceed and the weeds will be monitored and treated during the appropriate season. Weeds on adjacent properties may be treated as appropriate with permission of the landowner. Populations of Colorado or County List A and List B species (see Appendix A) will be reported immediately to the County Weed Manager. On Federal property or for federal projects, a Noxious Weed Inventory record will be completed each time a List A or B weed infestation is inventoried (with the exception of redstem filaree and quackgrass), and the populations will be reported. Monitoring will be conducted at least once a year, early in the growing season, by Oxy staff or contractors, and in coordination with BLM or FS staff on federal lands. For most of Oxy's operation areas, monitoring will occur between May and July. All previously treated noxious weed sites will be monitored for regrowth and scheduled for re -treatment as necessary. All disturbed areas under Oxy management will also be monitored to ensure there are no new weed infestations. 6.2 Prevention The purpose of prevention measures is to preclude the introduction of new or existing noxious weeds from the project area to un -infested areas or from adjacent land into the project area. 6.2.1 Construction Prevention Measures Construction equipment entering project areas (backhoes, trackhoes, dozers, blades, rollers, lowboys, equipment trailers, etc.) will be power washed or otherwise cleaned. "Equipment" is defined as any earth moving and any other machinery, trucks or vehicles, trailers and tools. On Federal property, equipment may be inspected by USFS or BLM personnel. Pickup trucks, SUVs, vans, water trucks, and pipe trucks should also be clean but do not require inspection prior to entering federal lands. Track pads, gravel beds or rumble strips will be installed at ingress/egress points to the site to limit weed propagules from entering or leaving the site. Soils from infested areas of the project site will not be moved off site, but will be stockpiled and treated for weeds as necessary. If infested soils are moved off site, they will be kept on Oxy -managed property, monitored, and treated as necessary. Stockpiled soils will be monitored and treated to control noxious weeds. All purchased products used in development and reclamation of a site will be inspected or certified as weed -free whenever possible, including soils, rock and gravel, seeds, mulch and erosion control products. 6.2.2 Revegetation The goal of reclamation and revegetation of a site after disturbance is timely establishment of a desirable plant community and prevention of noxious weed infestation. "Timely" is defined as "by the end of the second year of project completion" (BLM 2007). Elements of successful revegetation include the use of topsoil that was set aside during construction and kept weed -free; reseeding with appropriate species to establish plant cover, and stabilization of the soil surface with the appropriate mulches, tackifiers, and erosion control products as needed. Plans for revegetation and reclamation of disturbed areas are site-specific, and will include a plant list, method of seeding, how seeding success will be determined and how the revegetated area will be monitored. Most private landowners request re -seeding with common pasture grasses, including timothy, (Phleum pratense), brome grasses (Bromus or Bromopsis), orchardgrass (Dactylis glomerata), and oats, tricale, rye, or wheat as an annual covercrop. USFS and BLM seed mixes are compiled on a site-specific basis, according to elevation and existing vegetation community on the site. Non-native, non-persistent sterile grasses may be used to provide ground cover for soil stabilization and weed suppression during temporary reclamation on both private and federal land. See Appendix C for a sample Oxy Revegetation and Reclamation Plan. Certified weed seed free straw, hay, mulch, seed or other materials will be used for soil stabilization and/or revegetation purposes (Colorado Department of Agriculture certified inspector to State standards). Seed tags will be available for inspection upon request of the Inspector. Topsoil that is stock piled for more than one year will be seeded according to above standards at the earliest practical time to reduce the possibility of noxious weed establishment. Revegetation efforts will be monitored annually until successful establishment of desirable or intentionally planted seed or plants is confirmed. Noxious weeds found in revegetation will be documented, and managed per guidelines in this Weed Management Plan. 6.3 Control and Management A comprehensive multi -strategy approach utilizing IWM will be employed to detect, map, treat and control noxious weeds. Treatments will include herbicide, cultural, mechanical, revegetation, and biological control alone or in combination as necessary for efficient weed control. On Federal lands, control and management methods (including herbicide use) will be verified and approved with the appropriate land management agency representatives. Activities on BLM lands in Colorado requires submittal of a "Pesticide Use Proposal Form" (BLM 2007). The accompanying treatment tables describe the management methods, rates, and timing of control measures for specific targeted weeds (see Table 1 and Table 2). Treatment application records will be retained by Oxy and available for inspection by contacting personnel listed in Section 3.. Table 1. Weed Management Methods Herbicide Adjuvant or Target Weed(s) Management Recommendation Surfactant Timing of Method(s) Control Product/Ratet & Rate Chamomile, Herbicide, picloram or Nonionic Pre -flower, scentless mechanical, clopyralid, as per surfactant, as early season cultural label per label (Matricaria perforate) Houndstongue Herbicide, picloram or Nonionic Pre -bud or mechanical, picloram + 2,4-D, surfactant, as rosette stage (Cynoglossum cultural as per label per label (early spring) officinale) Knapweed, Herbicide, 1)clopyralid Nonionic Fall Russian cultural plus2,4-D, or surfactant, as 2)clopyralid plus per label (Acroptilon triclopyr or repens) 3)picloram, as per label Knapweed, Herbicide 1)clopyralid Nonionic Rosettes in fall spotted plus2,4-D, or surfactant, as or early spring 2)clopyralid plus per label (Centaurea triclopyr or maculosa) 3)glyphosate, as per label Moth mullein Herbicide, Dicamba or Nonionic Rosettes in fall mechanical, chlorsulfuron, as surfactant, as or early spring (Verbascum cultural per label per label blattaria) Oxeye daisy, Herbicide, Clopyralid or Nonionic Early, young (Chrysanthemum mechanical, metsulfuron surfactant, as growth leucanthemum) cultural methyl, as per per label label *Sulfur cinquefoil Herbicide, 1)picloram or Nonionic Spring or fall mechanical, surfactant, as (Potentilla recta) cultural 2)metsulfuron per label methyl, as per label *These are small population or individuals that have been treated in the area, and will be monitored; all others are large and widespread populations tHerbicides that are preferred for control are numbered as 1, if not numbered, there is no preference Herbicide Adjuvant or Target Weed(s) Management Recommendation Surfactant Timing of Method(s) Control Product/Ratet & Rate *Tamarisk, Salt Herbicide Triclopyr, as per Nonionic Basal spray on cedar label surfactant, as young plants, per label cut and treat (all Tamarix sp.) stump on older plant. Thistle, bull Herbicide, Clopyralid or Nonionic Rosette stage, mechanical, picloram, as per surfactant, as spring or fall (Cirsium vulgare) cultural label per label Thistle, Canada Herbicide, 1)clopyralid Nonionic Early bud stage cultural plus2,4-D, or surfactant, as or fall rosettes (Breea arvense) 2)clopyralid plus per label triclopyr or 3)glyphosate, as per label Thistle, musk Herbicide, 1)2,4-D or Nonionic Rosette stage, biological, surfactant, as spring or fall (Carduus nutans) mechanical, 2) clopyralid plus per label cultural 2,4-D or 3)glyphosate, as per label Thistle, plumeless Herbicide, Clopyralid or Nonionic Rosette stage, mechanical, tricloram, as per surfactant, as spring or fall (Carduus cultural label per label acanthoides) Thistle, Scotch Herbicide, Picloram or Nonionic Rosette stage, mechanical, dicamba, as per surfactant, as spring or fall (Onopordum cultural label per label tauricum) *These are small population or individuals that have been treated in the area, and will be monitored; all others are large and widespread populations tHerbicides that are preferred for control are numbered as 1, if not numbered, there is no preference Table 2. Biological, Cultural, or Mechanical Methods to be Used Practice Target Weed(s) Seeding with approved seed mix to revegetate All weeds above, but especially important for those that disturbed land, including a combination of fast list cultural as a control method in Table 1. growing and long-term species (see revegetation plan). Removal of small infestations by pulling or hand Houndstongue, bull thistle, musk thistle, plumeless grubbing at any stage. thistle, scotch thistle Repeated mowing during bolting pre -flowering All thistle species stage; cutting, bagging and removal of flowering heads if already in flower Introduce biological control approved for specific Those with biological listed as a control method in Table weeds in very large infestations, after agency 1 have approved bio -controls. approval. 7. References Bureau of Land Management, 2007. Noxious and Invasive Weed Management Plan for Oil and Gas Operators, Glenwood Springs Energy Office, Colorado. Colorado Department of Agriculture. 2008. Noxious Weed Lists. Available: http://www.colorado.gov/cs/Satellite?c=Page&cid=1174084048733&pagename=Agricult ure-Main%2FCDAGLayout Mesa County, Colorado Noxious Weed Management Plan, Adopted November 30, 2009. Garfield County Weed Management Plan, Resolution No. 2002. 8. Local, State and Federal Contacts and Resources Glcmr-Qod S1xiAgc BUvTFncrgy Oflicc Fcologs;x &-mid Jmacyr;,,ir l#L.�T W Ecd7sian9�cnl�tt Spcct� � , ` Brill BI'enucumm Sixuk-v T cr 2411 Seulil CTsaud Ar =ua, Suitt: 141 -131-7 H rk)4d Glenwood Srniaar, C0 331601-d180 Gtmd?mictim, C0 S1506 PiLoac: (q70) 931-52-4 phone- (97t1) 2'1.1-3004 Foix, (9701947-5-767 Fay€, f970! 244-x0'83 Beth SrznuznlaQ;'t'Cb9m,a�oti- ntttrle_tnb2x's�'blux,tr3v Uxfi-ld C'Quary 4 egetimau-%Aumgexrem Mesa COLmty PeSr ansa Weed lnspectot Stsvc Antlioay AL&Tll si-roT5 P.0 Box 4' 5, ©laS CR 333A PC - Box 5087 Rifle CO 81650 OLMILd Ju❑ctim, C0 915t1� rt]98 Pluaue: ( 73IG=i-S GUI lr],Q11e� (970)255-7120 F x. ,'9741625-S627 Fax, (971D) 2A3-3519 S313T1_'dny `�l`z31't121C1-COIIIlCV,C{rih ILA40 iS mta@rm%8=11,11y 115 c oloraclo state University C OOPCra.titc Ixtcrlsion SCSvxcc C'olasado Suite Lnivusirq Congcutivc Extcusian'.Ser icc GafficldCouary mcsa ( OIU1 ty ICIQI Ras1mvdA-vcnIlc.F_OBax 111: :775H-.vy. SIl Rii7e_ CO 916s0-1117 Gnv,d Junctiion, C0 31503 Plione_ (9700 25-3969 Pllane. M701_144-183al Email: garrieid:4,L-a al.ostate eau Colorado Weed Mant��ent Ai isoL4ation Colt ra deo Dep7IiID2al of r'42mulrare PLone: 1 303 ) —,)9-79§9 Dvvisiof1 of l?1E111i Industry ZS'R'R'C4S'1L12,.Q1'� Biological Cont1-ol Secfion P.O. Box 4 'U PalisaTlc. CO 81.526 Photic +9706 a 4-7916 Colorado 39eparmenr of Aviculint- StAl Wefld courdinw}vr N kmaouS Wm -d Pro D1t ISIOn Of C0115erVEItiaO SCMCeS 700 1'.> iphAg 5h'ett.. Suite 4000 LaL-e'a'ood, Cil 80215AS94 Fhonc_ 0303)239-418' WCII 5110: iN'+l'!.i}±z.StatC.0ShlA5fI371+1�eC[ilYSi'CC��ttrl7l Appendix A Colorado Noxious Weed List List A- Statewide Eradication African rue (Peganum harmala)" Myrtle spurge (Euphorbia myrsinites)GM* Camelthorn (Alhagi pseudalhagi)GM` Orange hawkweed (Hieracium aurantiacum)GM* Common crupina (Crupina vulgaris)GM` Purple loosestrife (Lythrum salicaria)GM* Cypress spurge (Euphorbia cyparissias)GM* Rush skeletonweed (Chondrilla juncea)GM* Dyer's woad (Isatis tinctoria)GM' Sericea lespedeza (Lespedeza cuneata)GM* Giant salvinia (Salvinia molesta)GM` Squarrose knapweed (Centaurea virgata)GM* Hydrilla (Hydrilla verticillata)GM* Tansy ragwort (Senecio jacobaea)GM* Meadow knapweed (Centaurea Yellow starthistle (Centaurea solstitialis)GM* pratensis)GM* Mediterranean sage (Salvia aethiopis)GM* Medusahead (Taeniatherum caput- medusae)cM List B -Prevent Further Spread Absinth wormwood (Artemisia Musk thistle (Carduus nutans) absinthium)GM* Oxeye daisy (Chrysanthemum leucanthemum)G* Black henbane (Hyoscyamus niger)" Perennial pepperweed or tall whitetop (Lepidium Bouncingbet (Saponaria officinalis)* latifolium)GM* Bull thistle (Cirsium vulgare)` Plumeless thistle (Carduus acanthoides)GM* Canada thistle (Cirsium arvense)* Quackgrass (Elytrigia repens) Chinese clematis (Clematis orientalis)GM' Redstem filaree (Erodium cicutarium) Common tansy (Tanacetum vulgare)` Russian knapweed (Acroptilon repens)GM* Common teasel (Dipsacus fullonum)* Corn chamomile (Anthemis arvensis)` Cutleaf teasel (Dipsacus laciniatus)* Dalmatian toadflax, broad-leaved (Linaria dalmatica)* Dalmatian toadflax, narrow -leaved (Linaria genistifolia) M* Dame's rocket (Hesperis matronalis)` Diffuse knapweed (Centaurea diffusa)GM* Eurasian watermilfoil (Myriophyllum spicatum)* Hoary cress or whitetop (Cardaria draba)* Houndstongue (Cynoglossum officinale)* Leafy spurge (Euphorbia esula)GM* Mayweed chamomile (Anthemis cotula)* Moth mullein (Verbascum blattaria)' Russian -olive (Elaeagnus angustifolia)* Salt cedar (Tamarix chinensis, T.parviflora, and T. ramosissima)' Scentless chamomile (Matricaria perforata)* Scotch thistle (Onopordum acanthium)* Scotch thistle (Onopordum tauricum)" Spotted knapweed (Centaurea maculosa)GM` Spurred anoda (Anoda cristata)' Sulfur cinquefoil (Potentilla recta)M' Venice mallow (Hibiscus trionum)* Wild caraway (Carum carvi)" Yellow nutsedge (Cyperus esculentus)M" Yellow toadflax (Linaria vulgaris)GM* List C -Localized Concern Chicory (Cichorium intybus)G Common burdock (Arctium minus)G Common mullein (Verbascum thapsus) St. Johnswort (Hypericum perforatum) Downy brome or cheatgrass (Bromus tectorum) Field bindweed (Convolvulus arvensis) Halogeton (Halogeton glomeratus) Johnsongrass (Sorghum halepense) Jointed goatgrass (Aegilops cylindrica) Perennial sowthistle (Sonchus arvensis) Poison hemlock (Conium maculatum) Puncturevine (Tribulus terrestris) Velvetleaf (Abutilon theophrasti) Wild proso millet (Panicum miliaceum) G - Immediately report this noxious weed species to the Garfield County Weed Manager when found in Garfield County. M - Immediately report this noxious weed species to the Mesa County Weed Manager when found in Mesa County. . - These noxious weed species will be mapped and inventoried to meet BLM and FS requirements. Appendix B Excel Spreadsheet Components and Example Tables for Pesticide Reporting The Excel spreadsheet table will contain the data fields listed below. This information should have been recorded on Noxious Weed Inventory and Pesticide Application records completed during the field season. The Excel spreadsheet will contain a new entry for each weed inventory and/or pesticide application. Infestation Number (IN #): Needed when List A or List B species (with the exception of redstem filaree and quackgrass) are inventoried and treated. This is the unique number or code associated with each weed infestation. Date: Date of the weed inventory and/or treatment Observer/Applicator (Obs/Appl): Person conducting the inventory and/or applying the herbicide. Weed Name or Bare Ground: Common name of the weed. If it was a bare ground treatment state as such. UTM Easting (UTM E), Northing (UTM N) and Zone (Z) (should always be in NAD 83) or use Lat and Long if preferred. Be consistent with which one is used. Infested Acres (Inf Acres): List how many acres are covered with the weed. Density (Dens) i.e. Cover: L= Low (less than 5% total canopy cover) M = Moderate (5% - 25% canopy cover) H = High (more than 25% canopy cover) Surface ownership (Own): BLM, FS or private Herbicide Trade Name (Tr Name) or Treatment Method — if a manual or biological treatment state as such. Chemical Names (Chem Name) — Only needed when using an herbicide with multiple active ingredients or when using a mixture of chemicals. For example, if using Sahara DG which has two active ingredients, imazapyr and diuron, enter the first two letters of each active ingredient. e.g. im + di. See Excel spreadsheet example. Application Rate (Pounds Active Ingredient (A.I.)/Acre or Pounds Acid Equivalent (A.E.)/Acre): For those herbicides with multiple active ingredients, multiple columns for the application rates are provided. Application rates should be entered in the same order chemical names are entered. For example, for Sahara DG, the A.I./acre of imazapyr would be entered in the first Application Rate (AR #1) column. The A.I./acre of diuron would be entered in the second Application Rate (AR #2) column. If an additional chemical was used in the mix it would be entered in the third Application Rate (AR #3) column. Total Pounds Active Ingredient (A.I.) or Acid Equivalent (A.E.) Applied: For those herbicides with multiple chemicals, multiple columns for the pounds of A.I./A.E. are provided. Pounds of A.I./A.E. should be entered in the same order chemical names are entered. For example, for Sahara DG, the pounds of A.I. of imazapyr would be entered in the first Total Pounds A.I./A.E. (Al AE #1) column. The pounds of A.I. of diuron would be entered in the second Total Pounds A.I./A.E. (Al AE #2) column. If an additional chemical was used in the mix it would be entered in the third Total Pounds A.I./A.E. (Al AE #3) column. Acres Treated: This should equal the Total Pounds A.I./A.E. divided by the Application Rate in Pounds A.I./A.E. Example of a Table for Reporting Total Pounds Active Ingredient Applied and Total Acres Treated by Chemical Type Application Rate Chemical(s) Acres Treated Total Pounds A.I. or (lbs. A.I./acre A. E. or lbs. A.E/acre) metsulfuron methyl .056 20.7 1.16 metsulfuron methyl .075 1.7 .13 Total acres and # 22.4 1.29 a.i. Metsulfuron methyl .125+1.87 .07 .009+.0135 + 2,4-D Total acres and # .07 .009+.0135 a.i. clopyralid + .285+1.5 5.0 1.43+7.60 2,4-D Total Pounds A.I. or A.E. metsulfuron methyl 1.29 Clopyralid + .185 + 1.0 1.6 .3+1.6 2,4-D 2.37 Total acres and 6.6 1.73+9.2 # a.e. Example of a Table for Reporting Total Pounds of Active Ingredient Applied by Chemical Type Chemical(s) Total Pounds A.I. or A.E. metsulfuron methyl 1.29 2,4-D 9.21 clopyralid 2.78 glyphosate 2.37 Appendix C Sample Revegetation and Reclamation Plan The proposed facility will be in operation for an anticipated period of approximately during development and production of OXY's natural gas production operations. Upon termination of the development and production activities, the facility will be reclaimed, as outlined below: • All equipment and structures will be removed. • OXY will remove all safety and storm water BMPs, and other surface objects from the premises. • OXY will restore the site to pre -facility conditions by re -contouring and re - vegetating the site. Top soil will be redistributed across the site and will be reseeded with an approved seed mix (see attached seed mix recommendation). • OXY will monitor the site to ensure that 70 percent of the pre-existing vegetation is achieved, per the requirements of the area wide CDPHE Stormwater Permit for Cascade Creek and Collbran Developments. Seedbed Preparation and Slope Reconstruction: Cut and fill slopes will be backfilled and re-contoured to a slope of 3:1 — 2.5:1 or less in instances where necessary to match the existing natural contours. Following final contouring, all backfilled or ripped surfaces will be covered evenly with topsoil. Re - contouring should form a complex slope with heavy pocking. In areas with slope greater than 3 percent, imprinting of the seed bed is recommended. Final seedbed prep will consist of scarifying/imprinting the topsoil prior to seeding. 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 will 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 raking and harrowing, always perpendicular to the direction of slope. All compacted areas will be ripped to depth of 18" with max furrow spacing of 2'. Where practicable, ripping will be conducted in two passes at perpendicular direction. Topsoil: Following final contouring, all backfilled or ripped surfaces will be covered evenly with topsoil. The topsoil in the cut slope on the back of the pad will be heavily pocked using the excavator bucket to form an uneven soil surface complex which will aid in revegetation and help with slope stabilization. The fill slope, and remaining disturbed, and reclaimed areas will be track walked to aid in revegetation and slope stabilization. In areas that may not have been disturbed during the reclamation process or areas of suspected compaction that will be reseeded, measures will be taken to loosen and spread the topsoil. These measures may include scarifying the soil by racking or harrowing the soil. Seed Mix: Seed mix used for reclamation will be taken from the attached seed mixtures. Seeding Procedures: For best results and success, the recommended grass mixture reseeding should be done in late autumn in order to take advantage of natural precipitation for the region. The reseeding rate should be doubled for broadcast application. Preferred seeding method is multiple seed bin rangeland drill with no soil preparation other than simple grading to slope and imprinting and waterbars, where applicable. Alternative seeding methods include, but are not limited to: • No -till -drill (no soil preparation required); • harrow with just enough soil moisture to create a rough surface, broadcast seed and reharrow, preferably at a 90 degree angle to the first harrow; • hydro -seeding (most economical in terms of seed cost); and • hand raking and broadcast followed by re -raking at a 90 degree 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. The prepared soils will be seeded (weather permitting) no more than 24 hours following completion of final seedbed preparation. The seeding will be conducted by means of drilling the prescribed seed at prescribed seeding rate. The seed will be drilled with a common range drill at a depth of 0.25 — 0.5" beneath the soil surface. The seed will be drilled horizontally across the pad faces and perpendicular to the track walking when possible. When slope gradient less than 2.5:1 exists and drilling is not possible from a mechanical and safety standpoint the soils will be broadcast seeded at twice the prescribed amount. The reseeding will be monitored and reseeded as appropriate until the reclamation standards detailed above are met. Attachment E Cascade Creek Stormwater Permit COR0038414 STATE OF COLORADO John W. Hickenlooper, Governor Christopher E. Urbina, MD, MPH Executive Director and Chief Medical Officer Dedicated to protecting and improving the health and environment of the people of Colorado 4300 Cherry Creek Dr- S_ Denver. Colorado 80246-1530 Phone(303)692-2000 Located in Glendale, Colorado httP://WWWrcdphe,state,co.us .lune 21, 2012 Laboratory Services DiviSion 8100 Lowry Blvd. Denver, Colorado 80230-6928 (343)692-309D Doug Weaver, Ops Mgr & Attorney -in -Fact Oxy USA WTP LP 760 Horizon Dr Ste 101 Grand J unction, CO 81.506 RE: Renewal of Permit/Certification OF'Cpl� o * Kv IN ' 1876 Colorado Department of Public Health and Environment Administrative Continuation For: Cascade Creek Common Plata of Development Located at: 13 Mi N of Debeque (See map in file), Debeque, Garfield County Permit No.: COR038414 Dear Mr. Weaver; The Division has received an application to renew the above perm it/certif cation. It has been determined that there is sufficient information to make this permit/certification eligible for renewal. More information may be requested by the Division as progress is made in developing a new permit/certification for the above listed facility. This information must be made available to the Division when requested to complete the permit process. The Division is currently in the process of developing a new permit or master general permit and associated certification for the above permitted facility. The development and review procedures required by law have not yet been completed. When the discharge permit issued to you for your facility expired on .lune 30, 2012 your permit is administratively continued and remains nit etTect under Section 104(7) of the Administrative Procedures Act, C.R.S. 1973, 24-4-141, et see { 1482 rep[. vol. 10) until the new permit/certification is issued and effective. All effluent permit teens and conditions in your current permit will remain in effect until your new permit/certification is issued and effective. PLEASE KEEP THIS LETTER WITH YOUR PERMIT AND SWMP TO SHOW CONTINUATION OF PERMIT COVERAGE. Sincerely, I Debbie 3essop Permits Section WATER QUALITY CONTROL DIVISION xc Permit File STATE OF COLORADO COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT WATER QUALITY CONTROL DfVISION TELEPHONE: (303) 692-3500�f 1 876 CERTIFICATION TO DISCHARGE UNDER CDPS GENERAL PERMIT COR -030000 STORMVATER DISCHARGES ASSOCIATED WITH CONSTRUCTION Certification Number COR038414 This Certification to Discharge specifically authorizes; oxy USA WT"P LP LEGAL CONTACT:. Heidi Reed, Sr. RHS Aduisor Oxy TSA WTP LP 2754 Compass give Ste. 170 Grand Junction, CO 81506 Phone # 9701263-3609 ifrey&ordeonip. corn LOCAL CONTACT: Joanna Fry,, Phone # 9701263-7800 heidi reed oxy- tarn During the Construction Activity: Gas/Oil Field Exploration and/or Development to discharge stortnwater from the facility identified as Cascade Creek Development which is located at: 13 miles north of Debeque, map in file Debeque, Co 81630 Latitude 39134145, Longitude 108/14/10 In Garfield County to: Cascade Creek -- Colorado River Anticipated. Activity begins 07101/2005 continuing through 05/1712047 On 5 acres (5 acres disturbed) Certification is effective: 07/01/2007 Certification Expires: 06/30/2412 Annual Fee: $245.00 (DCI NOT PAY NOW — A prorated bill will be sent shortly.) Page 1 of 22