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HomeMy WebLinkAboutPitkin.EH.264527300004 () (2)October 27, 2017 Cameron Lynda L. Trust C/O Craig Ragan Mountain Interiors mtninteriors.com Bryan Daugherty REHS Pitkin County Environmental Health Department 76 Service Center Road, Aspen, CO 81611 RE: AS -BUILT, Onsite Wastewater Treatment System (OWTS) — Eagle's Rise, 65 Reitschule Lane, Pitkin County SE Job No. 13098.02 Parcel No: 264527300004 Pitco EH/NR Permit No. 0010.2016.POWT Dear Craig and Bryan Pursuant to County requirements, this letter provides documentation that the new Onsite Wastewater Treatment Systems (OWTS) recently installed at the above referenced site is in compliance with the permitted design. Sopris Engineering inspected the excavations, soils, materials and the installation of the system components at various times during construction, prior to final backfill and after all installations were completed. The system constructed on site was designed and built to serve an equipment barn facility in accordance with the design recommendations and specifications delineated on the civil design plans, OWTS and Details, and the design report, by Sopris Engineering dated March 3, 2016, submitted in support of a building permit application. The design criteria and system sizing information is summarized below. An As -built OWTS record drawing is attached delineating the As - built descriptions and location of the components. Design Criteria and As -built Svstem Comoonent Installation Design and installation of the engineered OWTS with enhanced treatment was in accordance with applicable Pitkin County and the State of Colorado regulations. The Equipment Barn facility includes 1 and '/2 bathrooms for use by the caretaker employee and property residents using the facility served by the new OWTS system. The facility will be used for temporary parking of the property owner's RV units. The system was designed based on the current Pitkin County design criteria for the use of a pressure dosed sand filter (SF) system. The design is in compliance with the current County Regulation No. 43 with area calculations based on the Long Term Acceptance Rate (LTAR) for ASTM-33 filter sand per a minimum equivalent 2 bedroom design capacity. The system included the installation of a three compartment 1000-gallon concrete septic tank with a 500 gallon dosing chamber equipped with a simplex pump dosing assembly and associated piping and controls. A full pressure dosed SF system was used to provide good secondary treatment performance in the variable soil conditions. The system utilizes an Orenco Systems simplex high head pump with a Biotube vault installed in the dosing chamber of the septic tank. The OWTS field consists of a single 300 S.F. treatment/absorption sand filter (SF) bed constructed with 36-inches of filter sand below gravelless chamber spray shield units, installed to provide equal pressure distribution of effluent. The septic tank effluent is dosed to the single distribution row via an individual custom perforated pressure distribution pipe running the length of the 60 feet by 5 feet sand filter bed. This technology mitigates any potential for excessive hydraulic loading and allows for even dispersal of effluent over the entire field area. 502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704- 0313 SopRis ENGINEERING • LLC civil consultants AS -BUILT, OWTS Cameron: Eagle's Rise -Equipment Barn SE Job No. 13098.02 October 27, 2017 The sewer pipes have been installed as specified with respect to design grades and other utilities. The gravity sewer pipes routed to the 3- compartment septic tank was bedded and backfilled with Class-6 base. The SF system was installed based on the design flow rate for an equivalent 2-bedroom single family residence and the LTAR rate for a sand filter. The GSF system is designed to dose small quantities of effluent across the bed for single pass treatment followed by infiltration of the heated effluent into the underlying soils. The system meets all required setbacks and was installed within the general location indicated on the plan. Our design is outlined below and delineated on the attached As -built Record Drawing plan. Sub Surface Conditions and observation A previous soil evaluation including USDS soil texture analysis was performed by Sopris Engineering in the vicinity of the building envelope to determine the design criteria. The soils were evaluated to determine the soil type, potential design hydraulic loading rate and determine the appropriate site specific treatment technology. The area within the building envelope had been previously excavated and the existing localized subsoils were exposed on the surface and along the excavated embankments to variable depths from 3 to 6 feet below the natural surface grades. During construction an additional soil evaluation was performed by the engineer with excavations observed in the specific area of the proposed treatment/absorption sand filter bed. The field is situated within an elongated strip of undisturbed land between the eastern activity envelope boundary and a landscape boulder retaining wall that forms an approximate 4-foot grade break with the previously excavated buildingidevelopment envelope. The exposed soils below approximately 6-inches of topsoil at the pre-existing natural grade consist of clayey loam with gravel, cobbles and scattered small boulders to depths of 4 to 5 feet. This native material is underlain by loamy sand to sandy loam with gravelly cobbles and small boulders containing approximately 30% to 40% of rock material. The rock and gravel is interspersed with the loamy sand to sandy loam soil matrix that generally has granular structure -shape and moderate to weak structure -grade. Another profile pit was observed by the engineer, in an excavation to the south of the proposed field, excavated to a depth of approximately 8 feet below the pre-existing natural grade that revealed consistent soils as described above with evidence of seasonal high ground water at approximately 8 feet. No evidence of free water was encountered in the treatment bed excavation during construction and is assumed to be at least 7-feet below the absorptive surface. Based on the soil evaluation the receiving soils were characterized as soil type 0 to, therefore the effective field design LTAR loading rate for the sand filter is 1.0 gal/S.F./day for a level 1 treatment system. The use of imported media has been confirmed appropriate for effective dispersal below the adjacent lower grades in the buildingidevelopment envelope. The landscape boulder retaining wall was placed on the 4-5 foot cut bank situated approximately 4 feet west of the nearest edge of the absorption treatment bed sidewall. The relatively dense undisturbed native mixed colluvial clayey loam soils in place behind the wall provide an effective impermeable barrier that will prevent potential outflows from the system to laterally migrate through the wall. The limited pressure dosed effluent routed to the 5- foot wide field will be treated and infiltrate vertically through the permeable sand filter for dispersal into the underlying sandy loam gravel and cobbles situated at and below the bottom face elevation of the wall. Based on the conditions observed and described above leakage of effluent and/or snowmelt through the retaining wall is not expected under any circumstance. With respect to the slope, boulder size and placement the wall provides effective structural stability and erosion protection. AS -BUILT, OWTS Cameron: Eagle's Rise -Equipment Barn SE Job No. 13098.02 October 27, 2017 Design Flow The equipment bam facility capacity is based on a minimum 2-bedroom single family residence. The design flow is calculated as follows: Residence Unit— 2 bedrooms @ 2 person /bedroom = 4 persons From the Pitkin Comity OWTS Regulation; Max. Design flow (Qd) _ # of people x 75(avg. flow) gal/person/day. Gallons per day for the subject house = 75 gal/person/day Qd=4*75*=300 a The septic tank capacity required for a minimum 48 hour retention time is calculated as follows: V = 600_ gal/day * 2 =600 gallons. Intermittent Sand Filter Treatment media/ Absorption System Design Long Term Acceptance Rate (LTAR) Considering the application of regulation 43 for design of unlined sand filters: Receiving Wastewater Treatment Level 1; loading rate for sand filter is (1.0 gal./S.F./day) for the minimum 36" depth of ASTM-33 sand treatment media; Loading factors L.F.; (Table 10-2, pressure dosed application bed = 1.0) A(sf) = Qd x L.F.: A(sf) = 300 gpd x 1.0 = 300 S.F. A = Area; Qd = flow (gal/day) = 300 gpd LTAR 1.0 Gal/S.F./day L.F.1=1.0 pressure dosing LTAR = 1.0 Gal/S.F./day for ASTM-33, sand A 60' by T bed was excavated to a 4.5' depth below finish grade. The surface was scarified and backfilled with 36- inches of ASTM-33, washed concrete sand. One run of custom perforated 1.25-inch distribution lateral was installed on top of a sand layer and covered with 14 Quick-4 chambers in 1 row with 14 chamber units for use as pressure dose spray shields, as delineated on the plan. The bed is dosed from the simplex high head distribution pump system installed in the third compartment of the septic tank. The top of the sand filter layer was placed at a depth of 18-30 inches from existing natural grade. The standard Quick 4 chambers were installed over the top of the sand along the centerline. Filter fabric was then placed over the chambers and the entire minimum 5-foot wide by 60-feet long extents of the sand filter bed and backfilled with a minimum 12-inch backfill cover. The slightly mounded field was constructed with final surface grading at a minimum 6-inclies above the surrounding surface grade with a minimum 3-inch topsoil layer placed over the field surface. The bed was constructed level and generally follows the natural contour grades. The chamber row was completed with standard end caps installed at both ends. A piezometer monitoring well pipe riser with threaded cap was installed near a corner of the field and extended down to the excavated surface depth at the bottom of the placed sand. Inspection port risers were installed on both ends and an additional riser was installed on the end cap above the ball valve installed at the end of the distribution lateral. AS -BUILT, OWTS Cameron: Eagle's Rise -Equipment Barn SE Job No. 13098.02 October 27, 2017 OWS Operation and Maintenance All components of the engineered OWTS shall be inspected on a regular basis and be properly maintained. The responsibility for repair and maintenance of the system will remain with the property Owner. The owner shall retain the services of qualified personnel to inspect the OWTS and to perform all maintenance and repairs necessary to ensure that the system is in good operating condition and is in compliance with the manufacturer's performance requirements. The operating components of the OWTS should be inspected every six months by a qualified maintenance or service provider. The tank, absorption field, pump assembly and other system components should be visually inspected bi-annually for debris, damage, leaks, or other potential problems. In general, for a properly utilized system, septic tanks should be pumped every 3 - 5years. The effluent filter should be cleaned every six months and at the time of pumping. Absorption fields should be maintained with suitable vegetative cover and kept free of root invasive plants. Positive surface drainage away from the absorption field should be maintained. If you have any question or need any additional information, please call. Sincerely, SOPRIS ENGINEERING, LLC J Paul E. Rutledge Design Engineer 264527300004-OWTS Final Completion Letter - 2017-10-27 6ENERrr1L NCIT£S: r �. h 'T D 3--00WMU0ff 1000L-one CCINCRE7E sEPrW TAW I x WTH (3) 2-4' OUSSEW FG MSMS 071i LW AT TW S�TJRFiIVE-1 Ir TALC OF4AW &0 RW OMPLEX fFnUENT PLWP ANY 7 : .yry �•*.411I `, 1IIII .N�E RM 1.2S SCWD-40 7RAAPSPORT WD&P ej CL-8 ABC & JW5TAf1KQ TIC I I I l qq LOW ORM SACK TO TAW, 11 111 � r� � •f � I II�� F>wRS7.d= R" CtWTROLBi W YE OF V7E W H MK 9 ,+J W \ I ffF� l_ 1L v i��yl �-y,�Uy,�;.��y� {y��[ � FROM L94AFR6ROUND El [A}I LM�I,L+y TAW Jr"y7�T1.7�7JL.e� 771 iL{e�L FIff1C�-7�, SEWAGE QP�ANa r O ;l'{F7f4 T 1 -P PVC S>10-40 M1# M.47€D PIPE �1l6N LATERAL W1 5 }IT IfLEl74Ydr R� � ,7G R�VL �f�4 ��'l + �7'{•C�IP''�J��yTHEp{ rJ1�1 yy S.+�Jy0 :,�'JI�}PAC 7SE�"t�J'RpE��F iLy'1J 1;ARE 7S7�7AALE�S`y + •'t 4�M MU Wf'IE ED J) -! 0 OtLOCX WJ I f �L rf L �-el7 J I & � A-5 r W7� /ED � y �th J�0*NWAR.D AT BOTH J29} ALLOMNG DRIIIf�'�IVE OF OUr OF PPE i rr 4! .LGY �! i4ii5 Fire rR Y IILAT ~IR r '' • 1 5€II I l Y # r FFE;DU+I�J� R SrAL.I.M ti+yr'Sr ;` F JdiMM JX= Aj$Wr04/7REAn0Tr SW W1 14 WOK-4 d1R II RDW WSTALLM AT V61a, MADE r-L44EW.W F6IR €iLeVAL P1VS554lrM J fR T76mL CHAMBERS INSTALLED OVM A W" FILTER S4W LAYM EXXCAVATED 0.1Y RAT rW CLA %EY LOAK SOFL.S 70 A J:IE qW OF 4,5-nET WTO WERE B.ACKFUED FFFTT1 A AM Ire' OF III+ 7nE EXCAVATED WR MVM 41" TI•tME MP OF N EUEVA Milk APARM � VE +;=T i�R: { RV SANfTARY .h'OVK -UP Q . _ C0NNEC7?GW PORT 2 FICA' CLAN OUT ' IV SAMTARY I'fCOK UP -3/4 CONAE=T M low- - - --- %%% f i �3 � r hh 3� r+ f� %%- L 04STA � JrTI 41, AISIR WE " � f PONT AT END CAP PME7RARM OW.) Ar - _ - WTAL1ED .A 4* AltM PW ON QTIR -- "- -- PARM ENE; CAP PENE ATIC A90W f _ -. P RS A �T TXW LATERAdkr L r _ " _ 10 0 CIS 40 _ to �AUMS - � _ - _ � f RXIf 4P GRAWTY SEW IM _ - f �. A dr Ar 04 1 inch a YG ft. k ' _ � � � - -- - - •fig r __ - -- FXMMC WATER S1."LY WRL tICAJM W FXCIF�5$ OF a00' iKs FROM PROP= OVIS FIELD � ll I• 1 TJyiUX) SOM A" PJF7.rAiff R GRKXM V ATM AfmTOTI'Wc K01 ANSTALLEV TO 19OT 4W OF EXCAMA OMMLED ONAMM END CAP EACH EW CFLUNIER rwvrr' . M` GUVITY SEWER U E INV-SD" 17 4XISTI�1G'&WE QUICK-4 INFILTRATORS INS .. 9MAI • INSPECTION PM USED FORSPRAYSHIBM #" GROkArrSMERLINE INSTAILLEDONfN6 . . . . . . IN d4�! . . . . . . . . . . . . F . . . . . . . . .. GAtI} . . . . . 1 r Lt ST011AFIEWG ATED DL ERIBLfTl M RNL2 EU GRADE PIPE ' J IN'.. 8D"'51a = 4 •s. y - - - - - - :RA-ffVE YEY L1]iMh� --� x . . TO4'•E'DIE EXG tIX . . . . UNE INATIVE VEL1'rSANUy 3V BJM OF FILTER SAND IWO &LLLON THREE Rl CIDEB4F5 R 43 Li ry ''r r T,7,' •� ati q� 0*(* LLEA pf• dLO A.1101%1 F O41 �w 0+30 EQ BARN SEPTIC ALIGN PROFILE I�1I5�I6A.iDC i'-Q' 0".., F' DEEP OMMIYL PAD It FAW I ftD -emwtc UW ]ADO 1+26 V&MM' org AERAIMSMZOW RLL LAVER OF ALA1iIE SM ILIm W40 9038 1000 Gsllorl Top Seam Thre Compa1'#Frt1ent Item Mth l igb Head Pump 1001�T�CF-HH �y aao �.IIo.L Tom �I�,ti.} TOP Ar view *vow an 4■u i+' A2u + 1r "'r" ■v■ r� ell L - Fr * tb yd,z {�5F,tio • e.oao F19 r arr:rra � dr Ar 6■3 + r.rc a w rro ,.,or,■z =a_ 4�ti�bm L 7-•1-I i W +MIrM rK - 4" rtr rl ■�rl RMi rR Yd�� tYt Y-1O ^I —I,,— *RG iC IYF I—Z tb& � peat mI— r� rYrM fir + Nwi OP-1- es IR -•-•-I cwyLx�� _ l NNW Y 1)41 dgm r Y1h Y{r■� p�Y � ■�LFr iv+n rrY{tJ� Filc 1� 07 M #1 5412r V*44 . z,rtw r Section IX-rr a -o" rView r-v je d - i Jr - F ■ LPM * 1"NMI ~Quftkp"4 ortr 41'-+r ■ tiarirrtivr#~rarnttMa aft ffmm • carWf" 4w4mon bolt N&0A %Wftvd mopes 'SSwvzei awdracts a+,dMrib is rim 7armrtia' p49-4 q If—, V----MEC-3 !41 DT.3Jly MMI Wd#L If• Itl�� F �• �• wl y ...1 LdLjR wIR ■11i tid LAY YiL d1Y1 r.rd 1 ■ rq-k rvo W hd,- "I we xr 1�Le W re #AF sd 372 w -{3 p+ 1" rd 51M b■ ff= rP FYM hm 004217 4WWP � (min 3"M � iT.Ti.TrT i � #fitMR7DItrQ11 pwodm. T71+I�Tr1~1'' iFrr ; 44WbAc ,YYYYR� asrt - r - ef SYSTEMS UESlGINED FUR RESIDENTIAL SE W.3E TREATMENT SMALL ONLY RE]G&V� SMw $IE} DEaRADA9LE wAsru POR TREIATMEAT IAR O DIGPCft94 A& Aft OOWATIE]LE W}TIN THOSE EII❑LCkGICAL IREA314 WF PROCESSES INDICATED IN THE: SLIEWITFED IDESIGPJ. (T 1S REDOWEJNDED THAT ANY POTENTIAL RV D#1tVr NG 81101-RD BE PeRFORNED AT AN ALFTHCM ZED FtV E)UL P:8TATIi0t} PifiIDR TOA TEMPORARY RVCGININECTION TO A SEWA-0F,S14MAM OWE ROUTED TD A SEPTIC TAHK ASSCCh4TED V" A IPER6iTTED aNT& ANY INTERNT TENT SUPPLEMENTARY Di80HIARX OF :SeWAOETOftiSEPMTIAwM ET FROM ANAUXLMRY50UIRCEsH L.LHOTCoNmimAtNYToxic MON 4910-DWMMADU ADDITIVES AND SH&L N INTRODUCED INITIALLY AT A YRIGILLE TREK THE LAST 5C%OF ELAM WATER VfOLIALE DISCHARGED AT A< RATE BELOW 70 GPM. UR NR No CIRCLMIDTAWX Dki1 U IAHY ETIHYLENE OILY= OR OTMR L'OWISU STANCE, OF ANY CONCIrKITRAITIOW.IRE aI CHAROEO INTO SEP-11CTANK OEM W-0-1101 FLOOR aox r fffpfpr�aW �&-M& bR AP W EOML t9L4CrF3NL50J d- DEPTHS GIkkWJ�< ra�S!` a CIF tMILM FRWE ii WK. SAW SFI UOT E N d 4' RISER -V TRUE WYE 4r SEYNX LMft srrNr'xet' ME - TWO -VI AY SEINER CLEAN OUT DETAQ L N,T,5 KADVE SM SELECT &WXML LrYC]G 1J11F11L1<iG4TQR -OR RJiit J�IO&FM5fiRV sNZ 05 O H0M EM'EIFI'2' 4L0W >1iF 7IOP LIT PWE 3E' TYPKA YARD LW($CAftDF1 IQIR AGGREATF PAVED AM FACE J i. - �k4r 19LUE BOARD JF rid MITT. OIEPTM CF COMER 15 LESS THAN 3' EXCAVATE MAT EP"L CONLOACFED 1­091)% *STANDARD PRGGT47R 4' � CL,435 6 RL44D ROM j" TRE DR— 126 OR APE PIPE N.-.5. i_ TK EWE RSSHOWN ON THE PLO" AND 7HE DETAILS WERE DESIGNED SY 5MLS ENINCERING. Z. THE PRDRI ME13 LOT COMDI m)m & FLAT INFORMATION WAS RT SOPRIS ENGINEERING 3- OWNER NAME AWE] AODRES-Cam**wr LyWa6 L Trust Eagle'sRarer0 RvAwfiL4 Lane, FFLbrrCOWNY d. P EL%(IMDW- 2764527 & THE OWTS WAS COraIYMCTED 1W- Wslums Compartyl,1i7$ Cunt ' RoMd 1ST 611lar+►wow Sprkm Co Bi{41�Ir1Fb��relrr5rebertlperrk.nrt� fi. R[1f1 UN 0G R n EHMR Permit Nm 00i0-2UICPMT OWT5 SYSHW AS MNS'T11kJE•M N0ISS 1- ALL MATERIA(S 00 INS7AlLLAMON WN1POMAS TO STATE AND cOumTT oNsi-re wA&TEwA-1rER TREATMENT S'Y5TEM(-UVV S}REGULATIMS6 2, AM 5EWBt LINES INSTALLEOWM SCH 41D FWC PIPE AND INSPECTION Pom U5E WERE 5DR-35- 3, INSTALLED A TWWo-WAY CLEM ourOI9 THE 5ERME LRE FROM THE HOUSE. M. THE 5EFTlC YANK WAS INSTALLED LEVEL ON COMPACTEDCLASS E BASE MATERIAL OWERLnNG NATIVE CMPACrM ML INSTAMIBD WATERT1Giii RSER5 VM'H Al1:1:E55 LIDS ATTHE FINISHED SURFACE 13KADE. THINK WAS BACKFILLED WJ'T11 SUR ABLE NATIVE 5R L FEE OF BOULDERS $ ,kDCK IN OUM'SS OF 3" DUL S. SANITARY MI`F E 1EE 1145TAr k ED OM THE SEPTIC TAINK IMLIET iND OUTLIET PLUME IN PcarnCIN TO ALLDW EASY INSPELMON AND MAINTENANa OF7At1K "tCPM THE TANK JhGCES* . EL THE CONTRACTOR rNSTALLED9EWEiRLINES, SEPTIC TANK AND P4ERS WATER71GHT, ALLIyLI_ImelN6 FIXTURES AND ChVT5 COMPONENTS SHALL BE hdA IRITAIHEO TO AVOID SURFACE OR QFWUMMATER FROM ENTERANG THE 5TSTEM AND TO PENT LEAKA E FROM THE SYSTEM- IN-HOUSE PLUMBiNIG FIX7U ES SHALL DE t1 AINTAIN20 TO MWNT EXCESS WA7EFL FiWA+I VVERIG THE SEPTIC SYSTEM. 7. 'THE DFMPOESNS AND R+ = LLlIC 'N O14 THE PLAN INDICATE GENERAL tM71ON AND DIMENSIONS 13YM OJWPOMENT& JAL THE 3F TREAJAiEINTjA10ORF nDN TRENCH WAS EW-AVATED TO LEVEL GRADE IN NATIVE FAR-DL TK MNCH 00rOM AND SIDEWALU *M SCMIF1ED. A 741E LEACHING CFIWtMFIEf 5 WME INSTALLED LEVFL WM A MINIMUM -DU1ER OF 12-1NGHES OVFRLYiNG 36 INCHES OF FILTER SdINDL 1ik END M WRTFM iN PO how PORTS WERE INSTALLED ON THE END CHAMBERS IN EACH TRENCH. 11, YLi TIC+1L INSPECTION POM Y4EfI:E INSTALLED RUM THE PRIE MARKED HOLE ON THE TOP OF EACH END CHAMISER END CAP. ('T'1'F_ 9OTH ENDS OF EACH R(3WP TH E PORTS HAVE RIPE CAPS INSTALLED AIBD A GRAOE- 12, IN57AILiATION OFLFACHW6 E ipIERS ISLN CONPORMANCEWr H71IE MMUFACTURES INSTALLATION INSTRUCTION & 13. 7HE AgSO ON FIELD SJURFAM WEME SUGHT0 Rr ORJNDED TO IDIVERT SURFACE DRAINME i%Wal' FRGM THE RELD. IA. THE E1+ITIRE AJSOWnON FIELD SUFLFAC4 HAVE IWEN SFE13ED AND MULCHEOTO RE M7AIKfiH VEGETATED COVER- 15. THE AH5CRFTI N FIELD WERE INSTALLED PER THE RJECOARED-*78Ii4CK DISTItiNCES: 1-0 FEET FWM ANY PINOREITTYLINE, 25 FEET FROM AUY POTABLE WATER SUPPLY (LINE_ 20FEETFPDM WY OCCUPIED DWELLING. 100FEE7 FROM ANY WELL, SPMG 0111 057ERr#, 50 FEET FROM ANY STREAM OR WATER COURSE. 0 "a!00 Caiou"xM off S InBtsRaLlon - f an VWrS wlLh a mldmum 2 M ea3pa2iEy. Frond ft nyryl� *Wkv 89M ftgumm 45L MieirriuthpdoL&gdr4 bmebd bet 2 h8drnd-4 per -hors Qellona peer #ay PW p&DW z7S g0i'DW9DWday. Nv pa Hi-. 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