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
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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
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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
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Qellona peer #ay PW p&DW z7S g0i'DW9DWday. Nv pa Hi-. ',acL&
MhX nfiftir fib- (Qd�GF11— rLpy={Alad p5 ") N (.1vE Aran• GArT,gwrk`4W,
105op ibw Qd=-rr5=3 D 9Fd
sub su t oo Coadi ws -end ObaP3ym r1
The o=poalee evils bakes epproxiftUtely C.Md ea 61 b5p&Nl Al the pre -ea lkkV Milu YI VM *Mom # c'1ai14ye
1)em *11h jprawel, wbDfaq wd ecettered arnal betjtte8 4a 4BVM aT4lo 5 kP L This raM* ffmb tel its
u Kiadw by Immyl sand tD sandy laar-t with oweally oo4kq- wed " I;- d Grp wvvk0 611*
30% to dW% of rock mlerlel. The ra% and grovel is Ind wM 1* It1er'aF• and id m*F barer sot
r9aVm ihak gefwrMy WE grw"Itdar WvAureV4We mW moderate Raweek
The landecape bmWer rokii ing wbl reeve pheM are the 4-5 ktot aA ail,al. d a porod M6yl d % t wMet
orf rho maorea od@c of the obwgTUan trwk nwA Ixrd r:Idmoill• Rm mlaoffty deFW taTdhWrbW FWAW mbad
wbviei dayek 10-sim toils in plam bafhirW rhea wol prouidb an tffiabg imponwdo{a grin: viol VAN pmmwtt
potanitel 4lXtf1CWv warn PIa ekeEBrrr 44 ratarsly tul le Gh iha well. Tth9 irs7�ed p+eaarrre dewed affllr�5i
rourbd b3 *m EAxAwide f{W wil ba lmsw and Infiamn tl Rhrow IA'a sand 14R 1rar
S" I imb the umdWlyiNg wrWy ka n graM and GobNm eikwhtd at aid below the uottan *n 1 11-
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