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Home My WebLink AboutApplication.pdf6 -D,0 -0R - Is so- GARFIELD COUNTY BUILDING AND SANITATION DEPARTMENT 108 Eighth Street, Suite 201 Glenwood Springs, Coloradof 81601 Phone (970) 945-8212 INDIVIDUAL SEWAGE DISPOSAL PERMIT PROPERTY Owner's Name OGTir kc to "^ BP ‘Q3> Permit 4 33 0 Assessor's Parcel No. This does not constitute a building or use permit. Present Address 103 Ww4B�. CkosA,e Phone 463- 5810 System Location 2383 rt (�ekuc�ke Legal Description of Assessor's Parcel No /Jl l ' c • J4 - O 1 _ oc3 SYSTEM DESIGN Septic Tank Capacity (gallon) Other Percolation Rate (minutes/inch) Number of Bedrooms (or other) Required Absorption Area - See Attached Special Setback Requirements: Date Inspector yyam�� ter-' FINAL SYSTEM INSPECTION AND APPROVAL (as installed) la- ate -Zee -7a �� cr_er� Call for Inspection (24 hours notice) Before Covering Installation System Installer Septic Tank Capacity Septic Tank Manufacturer or Trade Name Septic Tank Access within 8" of surface Absorption Area Absorption Area Type and/or Manufacturer or Trade Name Adequate compliance with County and State regulations/requirements Other - ,n Date Rv �R-O - Inspector titan /� , Cr -V1.0 RETAIN WITH RECEIPT RECORDS AT CONSTRUCTION SITE *CONDITIONS: 1. All installation must comply with all requirements of the Colorado State Board of Health Individual Sewage Disposal Systems Chapter 25, Article 10 C.R.S. 1973, Revised 1984. 2. This permit is valid only for connection to structures which have fully complied with County zoning and building requirements. Con- nection to or use with any dwelling or structures not approved by the Building and Zoning office shall automatically be a violation or a requirement of the permit and cause for both legal action and revocation of the permit. 3. Any person who constructs,alters, or installs an individual sewage disposal system in a manner which involves a knowing and material variation from the terms or specifications contained in the application of permit commits a Class I, Petty Offense ($500.00 fine —6 months in jail or both). White - APPLICANT Yellow - DEPARTMENT INDIVIDUAL SEWAGE DISPOSAL SYSTEM APPLICATION OWNER I lGrGf�4 ADDRESS I lo& I Z CONTRACTOR (Jw n o_� PHONE `,yr:r _w?„ f 0 ADDRESS PHONE PERMIT REQUEST FOR (*) NEW INSTALLATION ( ) ALTERATION ( ) REPAIR Attach separate sheets or report showing entire area with respect to surrounding areas, topography of area, habitable building, location of potable water wells, soil percolation test holes, soil profiles in test holes (See page 4). LOCATION OF PROPOSED FACILITY: // Near what City of Town /Z ?kC4h (ar6u»eic6 i& AJrx0JSize of Lot, ,,27 gimp. s Legal Description or Address C(27 G (C c c/ a 6e - WASTES TYPE: (i) DWELLING ( ) TRANSIENT USE ( ) COMMERCIAL OR INDUSTRIAL ( ) NON-DOMESTIC WASTES ( ) OTHER—DESCRIBE BUILDING OR SERVICE TYPE: —At r 1 DIA) e I,'n1i Number of Bedrooms g Number of Persons 5 ( ) Garbage Grinder j Automatic Washer ( ) Dishwasher SOURCE AND TYPE OF WATER SUPPLY: (S) WELL ( ) SPRING ( ) STREAM OR CREEK If supplied by Community Water, give name of supplier: DISTANCE TO NEAREST COMMUNITY SEWER SYSTEM: ( (7s Was an effort made to connect to the Community System? it fl .,�.,.— A site plan is required to be submitted that indicates the following MINIMUM distances: Leach Field to Well: 100 feet Septic Tank to Well: 50 feet Leach Field to Irrigation Ditches, Stream or Water Course: 50 feet Septic System (septic tank & disposal field) to Property Lines: 10 feet YOUR INDIVIDUAL SEWAGE DISPOSAL SYSTEM PERMIT WILL NOT BE ISSUED WITHOUT A SITE PLAN. GROUND CONDITIONS: Depth to first Ground Water Table Percent Ground Slope 2 TYPE OF INDIVIDUAL SEWAGE DISPOSAL SYSTEM PROPOSED: SEPTIC TANK ( ) AERATION PLANT ( ) VAULT ( ) VAULT PRIVY ( ) COMPOSTING TOILET ( ) RECYCLING, POTABLE USE ( ) PIT PRIVY ( ) INCINERATION TOILET ( ) RECYCLING, OTHER USE ( ) CHEMICAL TOILET( ) OTHER -DESCRIBE FINAL DISPOSAL BY: ABSORPTION TRENCH, BED OR PIT ( ) EVAPOTRANSPIRATION UNDERGROUND DISPERSAL ( ) SAND FILTER ABOVE GROUND DISPERSAL ( ) WASTEWATER POND OTHER -DESCRIBE WILL EFFLUENT BE DISCHARGED DIRECTLY INTO WATERS OF THE STATE? J\) D PERCOLATION TEST RESULTS: (To be completed by Registered Professional Engineer, if the Engineer does the Percolation Test) Minutes per inch in hole No. 1 Minutes per inch in hole No. 3 Minutes per inch in hole No. 2 Minutes per inch in hole No. Name, address and telephone of RPE who made soil absorption tests: Name, address and telephone of RPE responsible for design of the system: Applicant acknowledges that the completeness of the application is conditional upon such further mandatory and additional tests and reports as may be required by the local health department to be made and furnished by the applicant or by the local health department for purposed of the evaluation of the application; and the issuance of the permit is subject to such terms and conditions as deemed necessary to insure compliance with rules and regulations made, information and reports submitted herewith and required to be submitted by the applicant are or will be represented to be true and correct to the best of my knowledge and belief and are designed to be relied on by the local department of health in evaluating the same for purposes of issuing the permit applied for herein. I further understand that any falsification or misrepresentation may result in the denial of the application or revocation of any permit granted based upon said application and in legal action for perjury as provided by law. Signed C� Zo,, t � Date 54///27PLEASE DRAW AN A� C°URATE MAP TO YOUR PROPERTY!! 3 Designate North Arrow O czt N _t N w O • D Q 3 a 0 ✓ r` U i. U • "O U O C O ti v y N ievi Wcd • Y • 0 O cc e U 0 U ti tn • h N N • ti 0 U bq o2j N N N z County Road (Note the Road Nu HEPWORTH - PAWLAK GEOTECHNICAL August 22, 2007 Rick and Cassie Oger 16313 Highway 82 Carbondale, CO 81623 Hepworth-Pawlak Geotechnical, Inc. P. O. Drawer 1887 Silverthorne, Colorado 80498 Phone: 970-468-1989 Fax: 970-468-5891 email: hpgeo4@hpgeotech.com Job No. 107 0335 Subject: As -Built Evaluation of Individual Sewage Disposal System, Lot 3, Overview Subdivision, Garfield County, Colorado. Dear Mr. and Mrs. Oger: Hepworth-Pawlak Geotechnical, Inc. has observed the installation of the Individual Sewage Disposal System (ISDS) for the three bedroom residence at the subject site. The ISDS components observed include: septic tank, dosing tank, , sewer pipe, effluent pipe, cleanouts, manifold pipes, Infiltrator chambers, inspection ports and the locations of all components. Based on our observations made during our site visit on August 14, 2007, it is our opinion that the ISDS was constructed in accordance with our ISDS design dated July 31, 2007, Job No. 107 0335, except for the following: 1) No observation ports were observed in the corners of the absorption bed. We recommend that observation ports be placed in all four corners of the absorption bed; and, 2) The 1,000 gallon, two chamber Copeland Concrete septic tank proposed was replaced with a 1,250 gallon, two chamber Norwesco plastic septic tank. The Norwesco tank exceeds the minimum specifications in the design and does not compromise the integrity of the system. An As -Built site plan is provided as Figure 1. Sincerely, HEPWORTH - PAWLAK GEOTECHNICAL, INC. J Jason A. Deem Project Geologist Reviewed by: Ronald J. Uhle, P.E., C.C.E. Associate Attachments: Figure 1— As -Built Site Plan #tts SI0NM Glenwood Springs 970-945-7988 ® Parker 303-841-7119 ® Colorado Springs 719-633-5562 APPROXIMATE SCALE: 1 INCH = 50 FEET MINIMUM HORIZONTAL DISTANCES FIELD T0: TANK TO: PROPERTY ONES 15 HOUSE 9 TANK 6 WATER 0NES 19 HOUSE 29 SURFACE WATER 50 WATERLINES 25 DRY DITCHES 10 SURFACE WATER 50' WELLS 50 DRV D1TOHES 25" PROPERLY LINES 19 WELLS 1001 I551GAi10N DITCH 50" 951511NG 91E109 2P CUT BANKS 4% VERT, CUT HEIGHT BUILDING SEWER TO WATER LINES WELLS • ADD 8 FT. FOR EACH 100 GAL/ DAY DESIGN FLOW OVER 1,000 GAL.. /DAY. IS PROPOSED THREE BEDROOM RESIDENCE EXISTING WELL HOUSE CLEANOUT (TYP.) PARCEL C 23.51 1,250 GALLON, TWO CHAMBER NORWESCO PLASTIC SEPTIC TANK EQUIPPED WITH AN C EFFLUENT FILTER AT THE OUTLET OF THE 191..17° SECOND CHAMBER 11, ABSORPTION BED CONSISTING OF INFILTRATOR QUICK 4 STANDARD CHAMBERS CHAMBERS WIDE BY 17 CHAMBERS LONG 107 0335 Geech HEPWORTH'PAWLAK GEOTECHNICAL LOT 3, OVERVIEW SUBDIVISION AS -BUILT SITE PLAN FIGURE 1 HEPWORTH - PAWLAK GEOTECHNICAL July 31, 2007 Rick and Cassie Oger 16313 State Highway 82 Carbondale, CO 81623 Hepworth-Pawlak Geotechnical, Inc. P. O. Drawer 1887 Silverthorne, Colorado 80498 Phone: 970-468-1989 Fax: 970-468-5891 email: hpgeo4@hpgeotech.com Job No. 107 0335 Subject: Percolation Testing and Individual Sewage Disposal System Design, Proposed Residence, Lot 3, Overview Subdivision, Garfield County, Colorado. Dear Mr. and Mrs. Oger: As requested, Hepworth-Pawlak Geotechnical, Inc. has designed an Individual Sewage Disposal System (ISDS) based on the percolation rate of the subsoils for the proposed residence located on County Road 115. The data obtained and our ISDS design recommendations based on the proposed construction and subsurface conditions encountered are presented in this report. Site Conditions: The project site slopes moderately down to the south and site vegetation consists of scrub oak, sage brush and grasses. Water service will be provided to the proposed three bedroom residence by an onsite water well. The proposed residence will be a single story modular structure over a full basement. If plumbing is proposed in the basement, a lift station may be needed to pump sewage to the septic tank. Percolation Test: Percolation tests were originally conducted on June 15, 2007 to evaluate the percolation rate of the natural soils at the site. One profile pit and three percolation test pits were excavated at the approximate locations shown on Figure 1. The test holes were hand excavated at the bottom of the shallow backhoe pits and were soaked with water for 8 to 24 hours prior to testing. The percolation test results in the clay soils were not suitable for a conventional ISDS; therefore, additional tests were completed at approximately 63 to 64 inches below the ground surface in the underlying sand and gravel ONINNHid'3 ON59iSIOn July 10, 2007. The soils exposed in the profile pit consist of about 12 inches of A.1Nf?CC?n, tops oil overlying about 3.5 feet of clay. Beneath the clay, sand and gravel soils were LOOZ L 0 Nd q F� lla crl ngs 970-945-7988 ® Parker 303-841-7119 ® Colorado Springs 719-633-5.562 Rick and Cassie Oger July 31, 2007 Page 2 encountered to the depth explored. A log of subsoil conditioning encountered in the profile pit is shown on Figure 2. The soils exposed in the percolation test holes were similar to those observed in the profile pit. The average soil percolation rate is 36 minutes per inch and the percolation test results are presented on Figure 3. ISDS Analysis: Based on the subsurface conditions encountered and the percolation test results, the tested area is suitable for an ISDS utilizing the shallow soils and Infiltrator chambers. A site plan showing the proposed ISDS, existing water well, proposed residence, and the minimum horizontal setback distances of site features relative to the ISDS components is shown on Figure 1. The ISDS was designed for a total of three bedrooms. All materials and installation should meet the requirements of the Colorado State Board of Health's Guidelines on Individual Sewage Disposal Systems. Septic and Dosing Tanks: A concrete two chamber, 1,000 gallon Copeland Concrete septic tank, or equivalent, will be used for primary treatment of sewage from the residence. An effluent filter will be installed on the outlet of the second chamber of the septic tank. Sewage will gravity feed from the proposed residence to the septic tank and effluent will be gravity fed to the absorption area If the septic tank access riser lids will be installed at grade, with no backfill cover, then the lids should be insulated with foam insulation board to provide frost protection. The sewer pipe inlet tee in the first chamber of the septic tank should be installed beneath the access lid of the first chamber of the septic tank so that it can be reached for service should it become clogged. The PVC handle on the effluent filter should be extended up to withinreach of the septic tank access riser lid. This will allow for easy access and maintenance of the filter. Approximately 2 feet of soil backfill cover should be placed over the top of the septic tank to allow for easy access and frost protection. For maintenance reasons deep tank installations should be avoided and we should be contacted to evaluate this ISDS design should it appear that a deep tank installation Job No. 107 0335 Rick and Cassie Oger July 31, 2007 Page 3 involving more than 4 feet of backfill soil over the top of the septic and/or dose tanks may be required. Sewer and Effluent Piping: The sewer line from the proposed residence to the septic tank should not be less than the diameter of the building drain and not less than 4 inches in diameter. Soil backfill beneath the sewer pipe must be adequately bedded and compacted to prevent settlement of the pipe. The sewer pipe should be installed in landscape areas with at least 2 feet of soil backfill covering the pipe, or the pipe should be insulated on the top and sides with 2 inch thick rigid foam insulation board for frost protection. Beneath driven surfaces we suggest Schedule 40 PVC sewer pipe should be used and the pipe should be insulated if it will be installed with less than 4 feet of backfill soil cover. We suggest the use of Schedule 40 PVC pipe between the proposed residence and the septic tank, though this is not required by local regulations. The portion of the sewer pipe extending from 5 feet outside the building foundation should have a slope of at least 2%. Cleanout pipe(s) should be installed in the sewer line adjacent from the building foundation, adjacent to the inlet of the septic tank, where the sewer pipe bends at 90 degrees or more and at least one cleanout should be installed at least every 100 linear feet of non -pressurized sewer or effluent pipe throughout its length. We recommend that a straight section of pipe be installed between the residence foundation and the septic tank. Any required 90 degree bends in the sewer pipe should be accomplished through the use of a series of 45 degree smooth elbows or a 90 degree long sweep to help prevent clogging of the pipe. Absorption Area: The soil absorption area is designed to be 782 square feet and will consist of an absorption bed consisting of Infiltrator Quick 4 Standard chambers. The bed will be five (5) chambers wide by seventeen (17) chambers long. Each chamber was given 9.2 square feet of absorption area per Colorado Board of Health guidelines. Absorption area calculations are shown on Figure 4. The absorption bed must be Job No. 107 0335 Rick and Cassie Oger July 31, 2007 Page 4 excavated to the approximate depths shown on Figure 6. Due to the shallow clay soils, it is critical that the Infiltrator chambers be placed on the underlying sand and gravel soils for the ISDS to function properly. Care must be taken during ins allation to ensure that the soils exposed in the bottom and sidewalls of the bed excavation are not compacted. Once the bed excavation is complete it should be Left open, if necessary, to allow the soils to air dry prior to placement of the chambers and distribution pipes. Once the soils have air dried, if necessary, the bottom and sidewalls of the excavation should be scarified prior to placement of the chambers and piping. The on-site soils can be used as backfill over the chambers and should be graded to deflect surface water and precipitation away from the absorption area. We recommend the soil backfill be re -vegetated as soon as possible with a suitable grass mix. It is important not to plant large vegetation or vegetation with invasive roots in and around the absorption area and manifold piping as the roots may damage piping. Combination air vent/inspection ports should be installed at each corner of the absorption bed. The ports should be constructed of 4 inch diameter PVC pipe installed into the knockouts provided on the tops of the Infiltrator chambers. The ports should extend a minimum of 8 inches above the ground surface and should have ventilated removable caps. The absorption area manifold and dishibution piping layout is shown on Figure 5. All materials used and installation methods should meet the requirements of the Colorado State Board of Health, Guidelines on Individual Sewage Disposal Systems, Revised 2000. Subsurface Drainage: No free water was encountered in the profile pit when observed on May 5, 2007 and it is our opinion that a subsurface drain will not be required. If free water is encountered in any excavations on the site we should be notified to re-evaluate the need for a subsurface drain to protect the absorption area. Job No. 107 0335 Rick and Cassie Oger July 31, 2007 Page 5 ISDS Maintenance: The on-site ISDS will require maintenance. The level of maintenance will vary with the complexity of the system and water use habits of the users. We recommend that fats, oils, bath oils, greases, paint, solids, water softener backwash solution, water from hot tubs and other constituents that can clog and foul collection and disposal equipment are not disposed of in the residence drains. The absorption area and any areas directly up gradient of it should not be watered by lawn irrigation systems or other means as the soils may become hydraulically overloaded. Septic tanks and other treatment tanks should be pumped whenever the sludge occupies 1/3 of the liquid capacity of the first chamber of the septic tank. In addition, the effluent filter should be checked for clogging at least once per year and cleaned as necessary. We recommend that an operation and maintenance manual be developed for the ISDS. The ISDS should be operated and maintained as stipulated in the manual. If you desire our services, we can prepare the operation and maintenance manual for the on-site ISDS. Limitations: This design has been conducted in accordance with generally accepted engineering principles and practices in this area at this time. We make no warranty either express or implied. The conclusions and recommendations submitted in this report are based upon the data obtained from the profile pit and percolation test holes excavated at the approximate locations indicated on Figure 1 and to the depths shown on Figures 2 and 3, the proposed type of construction, and our experience in the area. Our findings include interpolation and extrapolation of the subsurface conditions identified at the profile pit and percolation test holes and variations in the subsurface conditions may not become evident until excavation is performed. If conditions encountered during construction appear different from those described in this report, we should be notified at once so re- evaluation of the recommendations may be made. Based on site reconnaissance, it is our opinion that the designed location of the ISDS does not violate any setback requirements of the current Colorado State Board of Health Guidelines on Individual Sewage Disposal Systems ISDS regulations. We recommend that the position of the ISDS components, proposed residence, existing water well and Job No. 107 0335 Rick and Cassie Oger July 31, 2007 Page 6 setback requirements be verified in the field by a Professional Land Surveyor licensed in the State of Colorado. Garfield County requires that an As -Built evaluation of engineered ISDS designs be performed by the ISDS engineer. We should be contacted to perform the ISDS As -Built evaluation the day before you are ready for the evaluation. Prior to evaluation, all ISDS components should be installed including: sewer pipe, effluent pipe, septic and dosing tanks, effluent filter, inlet and outlet tees, Infiltrator chambers and distribution piping. No components of the ISDS should be backfilled prior to our performing the ISDS As -built evaluation. Please contact us for any necessary revisions or discussion after review of this report by the Garfield County Environmental Health Department. If you have any questions, or if we may be of further assistance, please let us know. Sincerely, HEPWORTH - PAWLAK GEOTECHNICAL, INC. Jason Deem Project Geologist Reviewed by: 28161 ',gyp 7aS(o2,: Ronald J. Uhle, P.E. C.C.E. %,"9;9/0NAi*.NG\c Associate , j� Attachments: Figures 1 through 6 cc: Lou Eller Job No. 107 0335 APPROXIMATE SCALE: 1 INCH = 50 FEET LEGEND' P1 A PERCOLATION TEST HOLE PROFILE PIT MINIMUM HORIZONTAL. DISTANCES FIELD TO. TANK TO: PROPERLY LINES 10 TANK 5 HOUSE 20 WATER LINES 25 SURFACE WATER 55 DRY DITCHES 25" WELTS 105" IRRIGATION GITCEI 55" 52051150 FIELDS 25 CUT RANKS 40 VERT, CUT HEIGHT HOUSE WATER LINES SURFACE WATER DRY DITCHES WELLS PROPERLY LINES BUILDING SEWER TO WATER LINES WELLS 15°0155 15 50' 15 " ADO 8 ET FOR EAC11100 GAL./ DAY DESIGN FLOW OVER 1.000 GAL./DAY. M��// ��ECSPdO�� PROPOSED THREE BEDROOM RESIDENCE CLEANOUT (TYP.) PROPOSED 1,000 GAI LON, TWO CHAMBER COPELAND CONCRETE SEPTIC TANK EQUIPPED WITH AN EFFLUENT FILTER AT THE OUTLET OF THE SECOND CHAMBER EXISTING WELL HOUSE PARCEL C PROPOSED ABSORPTION BED CONSISTING OF INFILTRATOR QUICK 4 STANDARD CHAMBERS 5 CHAMBERS WIDE BY 17 CHAMBERS LONG 107 0335 Ge~Beech HEPWORTH-PAWLAK GEOTECHNICAL LOT 3, OVERVIEW SUBDIVISION ISDS SITE PLAN FIGURE 1 0 N 0 0 5 10 LEGEND: •.0.' NOTES: PROFILE PIT TOPSOIL; organic sandy silt and clay, moist, black. WC=14.2 DD=108 -200=67 CLAY (CL); sandy, with gravel and scattered cobbles and boulders, stiff, moist, red. 0 10 SAND AND GRAVEL (SM -GM); slightly silty, with cobbles and boulders, dense, slightly moist to moist, reddish brown. 2" Diameter hand driven liner sample. 1. Exploratory pit was excavated on May 5, 2007 with a Linkbelt 240 trackhoe. 2. Location of exploratory pit was measured approximately by pacing from features shown on the site plan provided. 3. Elevation of exploratory pit was not measured and the log of exploratory pit is drawn to depth. 4. The exploratory pit location should be considered accurate only to the degree implied by the method used. 5. The lines between materials shown on the exploratory pit log represent the approximate boundaries between material types and transitions may be gradual. 6. No free water was encountered in the pit at the time of excavating. Fluctuation in water level may occur with time. 7. Laboratory Testing Results: WC = Water Content (%) DD = Dry Density (pcf) -200 = Percent passing No. 200 sieve a) u_ s Q 0 0 107 0335 Ge'-`c�itech HEPWORTH-PAWLAK GEOTECHNICAL LOT 3, OVERVIEW SUBDIVISION LOG OF PROFILE PIT FIGURE 2 • TIME (min) 15 15 15 15 15 DATE PRESOAK FROM 7/9/2007 HOLE NO. 1 JI FALLRATE (in)... I (min/in)_...�. TIME 1/2 1/4 1/2 1/2 15 30 60 30 30 TO 7/10/2007 DIAMETER (in): ( 9 TOTAL d_.__........,. ..DEPTH (in):i 54 .� WATER DEPTH ATSTART (in):j 4.1/4 1 TYPE OF SOIL: Sand and Gravel AVERAGE RATE (min/in) = 40 HOLE NO 2 i FALL—1 RATE (min) ..... _. _._ (in) _1 (min/in)MEN `._._....__._DIAMETER (in): 9 TOTAL DEPTH (in): 54 WATER DEPTH AT START (in): 4 1/2 TYPE OF SOIL: Sand and Graeei AVERAGE RATE (min/in) = 9 TIME FALL (min) (in) (min/in) 15 15 15 15 15 1/2 1/4 1/4 1/4 15 30 60 60 60 DIAMETER(in):i 9 TOTAL DEPTH (in): 54 WATER DEPTH AT START (in): 5 TYPE OF SOIL: Sand and Gravel AVERAGE RATE (min/in) = 60 SOIL PERCOLATION RATE (min/in) = 36 LREMARKS: SOIL PERCOLATION RATE DETERMINED BY AVERAGING f LAST 3 READINGS OF EACH TEST HOLE. (— LOCATION OF TEST HOLES: SEE FIGURE 1 1_._.- ... I 107 0335 Ge Ptech HEPWORTH-PAW LAK GEOTECHNICAL LOT 3, OVERVIEW SUBDIVISION PERCOLATION TEST RESULTS FIGURE 3 ISDS ABSORPTION AREA CALCULATIONS In accordance with the Colorado State Board of Health' s Guidelines on Individual Sewage Disposal Systems, Revised 2000, the absorption area was calculated using the following equation: A _ Q(t's) 5 Where: A = absorption area in square feet Q = design flow t = soil percolation rate in minutes per inch = 36 constant = 5 Q = (bedrooms)(2 persons)(75 gallons)(1.5) Where: 75 = (constant) estimated average gallons of flow per day per person 3 = number of bedrooms 2 = (constant) estimated persons per bedroom 1.5 = (constant) design flow if 150% of average daily flow Q = 450 gallons per day A = 810 square feet Per Colorado State Board of Health ISDS Regulations, a reduction in the size of the absorption area of up to 40% will be allowed for use of Infiltrator Quick 4 Standard chambers in a bed configuration. Absorption Area = 486 square feet The absorption area will be increasted by 20% for use of a garbage grinder and an additonal 40% for use of an automatic clothes washing machine for a total increase of 60%. Minimum Absorption Area = 778 square feet Absorption Area per Chamber = 9.2 square feet Minimum Number of Chambers= 85 chambers A bed consisting of five (5) chambers wide by seventeen (17) chambers long will be used for a total of 782 square feet of absorption area. 107 0335 Ge Ptech HEPWORTH4PAWLAK GEOTECHNICAL LOT 3, OVERVIEW SUBDIVISION ABSORPTION AREA CALCULATIONS FIGURE 4 4 INCH DIAMETER PVC PIPE SLOPED AT 1% MIN. TO DRAIN TO ABSORPTION AREA MANIFOLD 4 INCH DIAMETER 1 I I PVC PIPE MANIFOLD 0 o INFILTRATOR END PLATES PIPING INSTALLED LEVEL INFILTRATOR QUICK 4 STANDARD CHAMBERS FIVE CHAMBERS WIDE (5) BY SEVENTEEN (17) CHAMBERS LONG INSTALLED LEVEL 4 INCH DIAMETER PVC VENT PIPE INSTALLED INTO KNOCKOUTS 7 PROVIDED IN INFILTRATOR 0 o CHAMBERS 107 0335 1—i Ge Ptech LOT 3, OVERVIEW SUBDIVISION PLAN VIEW OF ABSORPTION AREA FIGURE 5 HEPWORTH-PAWLAKGEOTECHMCAL APPROXIMATE EXISTING GROUND SURFACE GRADE COVER SOIL TO DEFLECT SURFACE WATER RUN-ON AND RUN-OFF. INFILTRATOR QUICK 4 STANDARD CHAMBERS EXCAVATE TO A MINIMUM OF 4.5 FEET BELOW THE EXISTING GROUND SURFACE SO THAT INFILTRATOR CHAMBER ARE PLACED ON THE SAND AND GRAVEL SOILS LEVEL AND SCARIFY EXCAVATION SURFACE PRIOR TO PLACEMENT OF CHAMBERS 107 0335 Ge Ptech HEPWORTH-PAWLAK GEOTECHNICAL LOT 3, OVERVIEW SUBDIVISION CROSS SECTION OF ABSORPTION AREA FIGURE 6