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Home My WebLink AboutOWTS Installation Observations 06.02.2020 June 2, 2020 Edward R. “Ted” White, P.E. Garfield County Public Health 108 8th Street, Ste. 201 Glenwood Springs, CO 81601 RE: Colorado Energy System – Office/Shop 1140 Devereux Rd, CO OWTS Permit No. SEPT-04-19-5702 BUI #19001,01 To Whom it May Concern: The purpose of this letter is to review the construction of the Onsite Wastewater Treatment System (OWTS) for the Colorado Energy System’s Office/Shop building constructed at 1140 Devereux Rd, Glenwood Springs, CO. Boundaries Unlimited Inc. (BUI) reviewed the septic tank, dosing pump, excavation, imported sand filter medium, and the distribution piping components of the OWTS construction on the following dates. Jan 23, 2019 Percolation tests & profile hole evaluation April 1, 2020 Verified traffic rated 1,500 gal concrete septic tank installation April 3, 2020 Verified excavation size – Sands & gravels encountered at 8’ depth April 4, 2020 Tested imported sand filter material (in place) (Weigh tickets & gradation analysis attached) April 8, 2020 Review distribution piping & gravels, verified bed elevations June 2, 2020 Verify dosing pump & control operation & sand filter bed backfill. Based on the above site inspections and tests, the OWTS appears to have been installed in conformance with the intent of the design and the current Garfield County Code. Please find attached a 24”x 36” pdf drawing of the completed construction noting actual installed components. Final ground surface grading will be completed during landscaping. I appreciate the opportunity to complete the requested review. Please feel free to contact me with any questions or for additional information. Sincerely, BOUNDARIES UNLIMITED INC. Bruce D Lewis, P.E. Project Engineer 24' X 9 ' SAND F ILTER BEDCDPHE APPROVED 1,000-GALLONTWO-COMPARTMENT PRECASTCONCRETE SEPTIC TANK W/ LOWHEAD DOSING PUMPINSPECTION PORT, TYP.5' MINPROPOSEDBUILDING1.5"Ø x 19' PVC PIPE, 3 @ 36" O.C.WITH 532"Ø ORIFICE 1' OC ALONGPIPE, FACE DOWN, CAP PIPE ENDS.2"Ø PVC PRESSURE PIPE, 36" MIN.COVER, CONSTRUCT IN PROTECTIVESLEEVE PIPE UNDER DRIVE.C/OCLEANOUT AT BUILDING2"Ø x 1.5"Ø REDUCER65.02'62.52'DEVEREUX RDAS BUILT NOTE:INSTALLED 1,500 GAL H20 TRAFFICRATED, TWO COMPARTMENT TANK W/30GPM HH TURBINE PUMP, 0.5 HP, 115VSIMPLEX CONTROL PANEL W/FLOATSAS BUILT NOTE:24"Ø CAST IRON RING &LID OVER CLEANOUTByRevisionNo.Date 923 Cooper AvenueSuite 201Glenwood Springs, CO 81601tele: 970.945.5252fax: 970.384.2833Engineer or Surveyor SealSheetClient Information:PROJECT NO.FILE NAME:Designer:Drafter:Date:N:\PROJECTS\2019\19001-Moritz Lot 11 Industrial Park Site Plan\dwg\SitePlan-New FF bdl.dwg 6/2/2020 2:40 PM NORTH9. 8. 7. 6. 5. 4. 3. ##6/2/20APLBDLsiteplan-new ff bdl.dwg19001970.456.4601Glenwood Springs, CO 81601274 Mountain Shadows Dr.Colorado Energy Systems LLCGlenwood Springs, CO 81601 ## ------ OWTS Plan Colorado Energy Systems 1140 Devereux Rd C.5005'10'Scale: 1" = 5'SYSTEM NOTES1.PERMIT #: SEPT-04-19-57022.ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH CDPHE REGULATION #43 ONSITE WASTEWATERTREATMENT SYSTEM REGULATION (OWTS), MOST CURRENT EDITION AND LOCAL AGENCY REQUIREMENTSWHICH MAY OR MAY NOT SPECIFICALLY BE NOTED ON THE DRAWINGS. THE CONTRACTOR SHALL BERESPONSIBLE FOR KNOWING AND CONFORMING TO SUCH SPECIFIC DETAILS AS ARE REFERRED TO IN THEABOVE MENTIONED REGULATIONS. THIS DRAWING DOES NOT CONSTITUTE AN OWTS PERMIT. A PERMITMUST BE OBTAINED FROM THE APPROPRIATE LOCAL AGENCY. THE ENGINEER MUST OBSERVE THECONSTRUCTED SYSTEM BEFORE BACKFILL AND PROVIDE A LETTER OF INSPECTION AS REQUIRED BY THELOCAL AGENCY. A REQUEST FOR INSPECTION MUST BE MADE BY THE CONTRACTOR AT LEAST 48-HOURSPRIOR TO THE EXPECTED TIME OF BACKFILLING.3.DEMAND CALCULATIONS (SEC.43.6.A.3.d)3.A.OFFICE/STORAGE BUILDING, TREATMENT LEVEL 2 (TL2).3.B.SYSTEM DESIGN PARAMETERS: FOUR (4) OFFICE EMPLOYEES (NO SHOWERS)+WATER CLOSET(TOILET).3.C.AVERAGE DAILY WASTEWATER FLOW (ADWF) (TABLE 6-2):3.C.1.ADWF = 20 gpd * (4 EMPLOYEES)+ 24.8 gpd * (1 WATER CLOSET (TOILET))= 104.8 gpdADWF = 50% FUTURE EXPANSION = 104.8 GPD *1.5 =157.2 gpd 4.SEPTIC TANK (SEC.43.9.B.2.d):4.A.ADWF: 158-GALLONS4.B.INSTALL A NEW 1000-GALLON TWO COMPARTMENT TANK WITH LOW HEAD PUMP4.C.THE TANK IS NOT SUBJECT TO BUOYANCY.5.ABSORPTION AREA CALCULATIONS5.A.A PRESSURE DOSING BED WILL BE USED.5.B.SOILS ANALYZED BY BOUNDARIES UNLIMITED INC (JANUARY 23, 2019) IN 8.5' DEEP TEST PIT;ENCOUNTERD 6" TOPSOIL OVER NATURAL SANDY CLAY (TYPE 4); SILTY SANDS WITH COBBLES (TYPE 1)ENCOUNTED AT 8' IN DEPTH; PERCOLATION TEST IN SILTLY SANDS AT 8' DEPTH RESULTING 6 MPI. PERTable 10-1A, USE TREATMENT LEVEL1 WITH MINIMUM 3-FOOT DEEP UNLINED SECONDARY SANDFILTER WITH LONG TERM ACCEPTANCE RATE (LTAR) OF 0.80 gpd/SF.5.C.MINIMUM SOIL TREATMENT AREA, A: A = ADWF = 157.2 = 197 S.F. LTAR 0.80 gpd/S.F.5.D.SIZE ADJUSTMENT FACTORS: PRESSURE DOSED = 1.0; GRAVEL BED = 1.05.D.1.A, adj = 197 SF * 1.0 * 1.0 = 197 SF6.THIS SYSTEM IS SIZED FOR TYPICAL DOMESTIC WASTES ONLY. BACKWASH OR FLUSHING FLOWS FORREVERSE OSMOSIS UNITES OR WATER SOFTENERS AND/OR FILTERS SHOULD NOT BE INTRODUCED INTOTHIS SYSTEM.7.CLEAN OUTS ARE REQUIRED AT THE HOUSE AND AT ALL BENDS AND AT LEAST EVERY 100-FEET BETWEENTHE HOUSE AND THE SEPTIC TANK.8.THE CONTRACTOR SHALL BE RESPONSIBLE FOR INSTALLING ALL WATER TIGHT COMPONENTS THROUGHOUTTHE SYSTEM TO PREVENT INFILTRATION.9.INSTALL RISERS AS NECESSARY TO BRING ALL ACCESS PORTS TO FINAL GRADE. PORTS SHALL ME MARKEDIF CAPS ARE TO BE BURIED.10.INSTALL 3-INCHES OF BLUEBOARD INSULATION, 3-FEET WIDE, OVER SEWER AND EFFLUENT PIPE WHEREVERDEPTH IS LESS THAN 5-FEET. UNDER NO CIRCUMSTANCES SHALL COVER BE LESS THAN 2-FEET.11.SITE PLAN INFORMATION FROM GOOGLE EARTH AND SURVEY CONDUCTED BY OWNER ON .12.LOCATIONS OF ALL COMPONENTS MAY BE VARIED AS NECESSARY AS LONG AS ALL MINIMUM DISTANCESAND SLOPES MEET THOSE REQUIRED.SOIL EVALUATION5.B.SOIL EVALUATION BY BOUNDARIES UNLIMITED INC (JANUARY 23, 2019) IN 8.5' DEEP TESTPIT; ENCOUNTERD 6" TOPSOIL OVER NATURAL SANDY CLAY (TYPE 4); SILTY SANDS WITHCOBBLES (TYPE 1) ENCOUNTED AT 8' IN DEPTH; PERCOLATION TEST IN SILTLY SANDS AT 8'DEPTH RESULTING 6 MPI. BASED ON TABLE 10-1 OF THE CDPHE REGULATION 43, THE SILTYSANDS AT A DEPTH OF 8' ARE TYPE 1 WITH A LTAR OF 0.80 GPD/SF6.NO GROUNDWATER OR BEDROCK WAS ENCOUNTERED OR OBSERVED IN THE 8.5-FOOT DEEPPROFILE PIT.SITE EVALUATION1.SITE AND SOIL EVALUATIONS WERE PERFORMED BY:BRUCE D LEWIS, PE - 19082BOUNDARIES UNLIMITED INC.923 COOPER AVE. STE 201GLENWOOD SPRINGS, CO 81601970.945.52522.EVALUATION DATE(S): JAN 23, 2019.3.SETBACK REQUIREMENTS FOR A TREATMENT LEVEL 1 (TL1) STA TRENCH/BED, UNLINEDSAND FILTER OR SEEPAGE PIT (PER TABLE 7-1) AND AN ADWF=197 GPD:3.A.SPRING OR WELL=100'3.B.POTABLE WATER SUPPLY LINE=25'3.C.POTABLE WATER SUPPLY CISTERN=25'3.D.DWELLING=20'3.E.PROPERTY LINE, PIPE OR LINED IRRIGATION DITCH=10'3.F.INTERMITTENT IRRIGATION LATERAL, INFILTRATION STRUCTURE=25'3.G.LAKE, WATER COURSE, IRRIGATION DITCH, STREAM OR WETLAND=50''3.H.DRY GULCH, CUT BANK OR FILL AREA=25'3.I.SEPTIC TANK=5'3.J.RESTRICTIVE LAYER OR GROUNDWATER (VERTICAL): 4' (TL 1, GRAVITY FEED)4.SETBACK REQUIREMENTS FOR THE SEPTIC TANK SHALL BE (PER TABLE 7-1):4.A.SPRING OR WELL=50'4.B.POTABLE WATER SUPPLY LINE=10'4.C.POTABLE WATER SUPPLY CISTERN=25'4.D.DWELLING=5'4.E.PROPERTY LINE, PIPE OR LINED IRRIGATION DITCH=10'4.F.INTERMITTENT IRRIGATION LATERAL, INFILTRATION STRUCTURE=10'4.G.LAKE WATER COURSE, IRRIGATION DITCH, STREAM OR WETLAND=50'4.H.DRY GULCH, CUT BANK OR FILL AREA=10'4.I.STA TRENCH/BED, UNLINED SAND FILTER OR SEEPAGE PIT=5'6"SANDYCLAYTOPSOIL71 2'±TOPSOIL (GRANULAR, NO CLAYS)SCREENED ROCK (12" - 212")REPLACE EXCAVATED CLAYS WITHSAND FILTER MATERIAL(IMPORT SECONDARY SAND MEDIA)EXISTING SAND & GRAVEL(6 MPI PERCOLATION RATE)10"12"6' MIN APPROXIMATELY 8'1-1/2"Ø PVC PRESSUREDOSSING PIPE, 3 @ 36" OC,W/5/32/ORIFICE SPACED 1' OCALONG BOTTOM OF PIPE, TYP.2" MIN6" MINSILTY SANDS W/COBBLESScale: N.T.S.Site & Soils Evaluation SAND FILTRATION BEDCROSS-SECTIONAPRIL 6, 2020, PERCOLATION TEST ON SURFACE OF IN-PLACESECONDARY SAND MEDIA, 7 MPI TEST PIT PROFILEJAN 23, 2019EXCAVATE DOWN TO NATIVESANDS & GRAVEL (APPR. 8')ATTACH REMOVABLE CAP ORTHREADED CLEANOUT ASSEMBLY.INSTALL MARKER IF CAP IS TOBE BURIED.FLOWFINISH GRADE4" OR 6" ØPVC RISER4" OR 6"Ø45° BEND4" OR 6" PVC WYE4" OR 6"Ø PVC SEWER LINEScale: N.T.S.Cleanout Effluent Filter(POLYLOK, INC)6"9'B R UCE D LEWISCOL O RADO LICENSEDPROFESSIONAL ENG INEER 5/26/20Scale: N.T.S.Inspection Port ATTACH REMOVABLE CAP ORTHREADED CLEANOUT ASSEMBLY.INSTALL MARKER IF CAP IS TOBE BURIED.FINISH GRADESCREENED ROCKSAND FILTER MATERIALDIVERT SURFACEDRAINAGE AWAY FROMSAND FILTER BEDMIRAFI 140N FILTERFABRIC UNDER TOPSOIL2% MIN2% MINAS BUILT NOTE:INSTALL 1,500 GAL H20 TRAFFIC RATED,TWO COMPARTMENT TANK W/ 30GPM HHTURBINE PUMP, 0.5 HP, 115V SIMPLEXCONTROL PANEL W/FLOATS1' MIN1' MIN