HomeMy WebLinkAboutSubsurface Investigation.pdfAugust 20, 2013 PO 80. 2844 Glenwood 5prlng~CO 81602 Ph 970-618·5033 FIX 303-216·2796 Brent and Cara Maiolo maioloconstruction@gmail.com Subsurface Investigation and Onsite Wastewater
Treatment System Design 2-Bedroom Residence + Future I-Bedroom Detached Dwelling Unit Mesa Street Garfield County, Colorado Brent and Cara, Project No. C I 047 ALL SERVICE septic, LLC
performed a subsurface investigation and an onsite wastewater treatment system (OWTS) design for the subject residence. The property is located outside of Carbondale, in an area where
OWTSs and wells are necessary. SITE CONDITIONS The property is currently undeveloped and relatively flat. A proposed 2-bedroom, single-family residence is planned. A I-bedroom detached
dwelling unit may be constructed in the future. There is a well located on the west side of the property. The Roaring Fork River runs to the northeast of the property. A ditch, partially
enclosed in a culvert, runs along the east property boundary. SUBSURFACE The subsurface was investigated by digging one 8-foot profile pit and one 4-foot profile pit. A soil sample was
taken from approximately 2.0 to 3.0-feet below grade. A gradation analysis and hydrometer analysis was run hy CTL Thompson and results are detailed in a report dated August 8, 2013,
Project No. GS05782-300. The materials encountered in the profile pit consisted of 6-inches of topsoil, underlain by reddish brown, dense, silty sand with small cobhles to 2.0-feet,
underlain by light brown, loose, sand to 3.0-feet, underlain by brown, loose, gravelly silty sand with stacked cobbles 4 to 8-inches in diameter to a maximum depth explored of 8.0-feet.
No bedrock or groundwater was encountered. The gradation performed by CTL Thompson shows the soil consists of II % gravel, 61 % sand, 20% silt and 8% clay. The USDA soil type is classified
as Silty Clayey Sand. A long term acceptance rate (LTAR) of 1.2 gal/sq. ft will be used to design the OWTS.
Page 2 July 17,2013 8-foot profile pit DESIGN SPECIFICATIONS The OWTS design is based on 3-bedrooms. An average daily wastewater flow of 450 GPD will be used. The installation must include
a 1000-gallon, two-compartment septic tank with a Biotube® pump vau lt and an Orenco® PF5005 pump in the second compartment. Other equivalent pump alternatives may be considered. Effluent
will be pumped through a 1.5-inch diameter pump line to a 12.8' x 33 ' bed with three rows of eight Eljen® GSF A42 Modules. Modules will be placed on 6-inches of concrete sand. A 1.25-inch
diameter manifold will distribute effluent to three 1.25-inch diameter lateral distribution lines with 31l6-inch holes, every 4-feet, facing up with the last hole facing down for drainage.
The 1.25-inch diameter lateral lines will be placed in a 4-inch diameter line with holes at 4 and 8 o'clock the entire length of the eight A42 Eljen® GSF Modules. The 4-inch line will
be placed on each row of modules, 4.2-feet on center, with 6-inches of concrete sand on each edge of the bed. The component manufacturers are typical of applications used by contractors
and engineers in this area. Alternatives may be considered or recommended by contacting our office. Construction must be according to Garfield County Sewage Disposal Regulations, the
Individual Sewage Disposal (lSDS) Pennit provided by Garfield County Building Department, and this design. REVEGETATION REQUIREMENTS An adequate layer of good quality topsoil capable
of supporting revegetation shall be placed over the entire disturbed are of the OWTS installation. A mixture of native grass seed that has good soil stabilizing characteristics (but
without taproots), provides a maximum transpiration rate, and competes well with successional species. No trees or shrubs, or any vegetation requiring regular irritation shall be plated
over the area. Until vegetation is reestablished, erosion and sediment control measures shall be implemented and maintained 011 site. The owner of the OWTS shall be responsible for maintaining
proper vegetation cover. OPERATION INFORMATION AND MAINTENANCE The property owner shall be responsible for the operation and maintenance of each OWTS servicing the property. The property
owner is responsible for maintaining service contracts for manufactured units, alternating absorption systems, and any other components needing maintenance. Geo-fabrics or plastics should
not be used over the drain field. No heavy equipment, machinery, or materials should be placed on backfilled drain field. Livestock should not graze on the drain field.
Page 3 Plumbing fixtures should be checked to ensure tbat no additional water is being discharged to OWTS. For example, a running toilet or leaky faucet can discharge hundreds of gallons
of water a day and harm a drain field. The homeowner should pump the septic tank every two years, or as needed gauged by measurement of solids in the tank. Garbage disposal use should
be minimized, and non-biodegradable materials should not be placed into the OWTS. Grease should not be placed in household drains. Loading from a water softener should not be discharged
into the OWTS. No hazardous wastes should be directed into the OWTS. Mechanical room drains should not discharge into the OWTS. The OWTS is engineered for domestic waste only. ADDITIONAL
CONSTRUCTION NOTES If design includes a pump, air release valves and weep holes should be installed to allow pump lines to drain to minimize risk of freezing. Excavation equipment must
not drive in excavation of drain field due to the potential to compact soil. Extensions sbould be placed on all septic tank components to allow access to them from existing grade. Precast
concrete tanks and distribution boxes should be used, unless plastic or fiberglass is required. Access to all tank compartments and distribution devices is optimal. INSTALLATION OBSERVATIONS
ALL SERVICE septic, LLC must view the OWTS during construction. The OWTS observation should be performed before backfill, after placement of OWTS components. Septic tanks, distribution
devices, pumps, dosing siphons, and other plumbing, as applicable, must also be observed. ALL SERVICE septic, LLC should be notified 48 hours in advance to observe the installation.
LIMITS: The design is based on information submitted. If soil conditions encountered are different from conditions described in report, ALL SERVICE septic, LLC should be notified. All
OWTS construction must be according to the county regulations. Requirements not specified in this report must follow applicable county regulations. The installer should have documented
and demonstrated knowledge of the requirements and regulations of the county in which they are working. Please call with questions. Sincerely, ALL SERVICE septic, LLC Carla Ostberg,
MPH, REHS Reviewed By: ~tt\ ",~,Sf)~-!:S' ~\' ~ "', Richard H. Pelz, _
August 8, 2013 CSO, Inc. 33 Four Wheel Drive Carbondale, CO 81623 Attention: Ms. Carla Ostberg Subject: Laboratory Testing Mesa Avenue, Satank Garfield County, Colorado Project No. GS05782-300
You provided a soil sample on July 30, 2013 from the site obtained from a profile pit excavated in the area of a new septic system. We performed gradation and Hydrometer testing on the
soil samples. You requested gradation and hydrometer testing on the soli sample. The sample tested contained 11 percent gravel and 61 percent sand size particles. The part of the soil
sample with diameters smaller than sand were subjected to hydrometer analysis. Hydrometer analysis determined that the samples contained 20 percent silt and 8 percent clay size particles.
Gradation test results are shown on Figure 1. We appreciate the opportunity to work with you on this project. If you have questions or we can be of further service, please call. Very
Truly Yours PSON, INC. !(.~ ERW:cd cc via email tocarla.ostberg@gmail.com 234 Center Drive I Glenwood Springs, Colorado 81601 Telephone: 970·945·2809 Fax: 970·945·7411
25 HR. 7 HR 45 MIN. 15 MIN 90 F eo ~70 iJj ~60 ~ ~50 w ~40 30 HYDROMETER ANALYSIS TIME READINGS 60MIN.19MIN. 4MIN. lMIN = '200 SIEVE ANALYSIS U,S. STANDARD SERIES '100 '50 '40 '30 '16
'10'8 " ~ .. 7· = I=+' = ---+=-CLEAR SQUARE OPENINGS 3/S' 3/4' 1 W 3' 1= 5'6" R" o 10 20 J= 0 30 W z ~ 40 W ~ 50 ~ "~ 60 ~ 70 eo 10 I----,---:1= , " o 001 0.002 .005 009 .019 037 .074
149 297 590 1.19 2.02.38 4.76 952 19.1 36.1 100 762 127 200 0.42 152 DIAMETER OF PARTICLE IN MILLIMETERS CLAY (PLASTIC) TO SILT (NON-PLASTIC) Sample af SAN[j,CLAYE'f.J.3lLTY (SC-SM)
From MESA AVE, AT 2-3 FEET HYDROMETER ANALYSIS 2SHR 7HR TIME READINGS CLAY (PLASTIC) TO SILT (NON·PLASTIC) Sample of From ceo, INC. MESA AVENUE, SATANK PROJECT NO. GS05782-300 5:\G505782._000\300\6.
Calcs\GSOS782 300 L 1 Gradation.xls SANDS FINE MEDIUM GRAVEL COARS FINE COARSE COBBLES GRAVEL 11 % SILT & CLAY 28 % SAND LIQUID LIMIT PLASTICITY INDEX SIEVE ANALYSIS 61 % % % U.S. STANDARD
SEAlES CLEAR SOUARE OPENINGS SANDS FINE I MEDIUM 1 GRAVEL 1 CQARS I FINE COARSE _L COBBLES 1_ GRAVEL % SAND SILT & CLAY % LIQUID LIMIT PLASTICITY INDEX Gradation Test Results FIG. 1
% % %
Pump Selection for a Pressurized System -Single Family Residence Project Parameters Discharge Assembly Size 1.50 Transport Length 40 Transport Pipe Class 40 Transport Line Size 1.50
Distributing Valve Model None Max Elevation Lift 10 Manifold length 8.4 Manifold Pipe Class 40 Manifold Pipe Size 1.25 Numberof Laterals per Cell 3 laleral length 32 l ateral Pipe Class
40 lateral Pipe Size 1.25 Orifice Size 3/16 Orifice Spacing 4 Residual Head 4 Row Meter None 'Add-on' Friction losses 0 Calculations Minimum Row Rate per Orifice 0.87 Numberof Orifices
per Zone 27 Total Aow Rate per Zone 23.6 Number of laterals per Zone 3 % Row Differential I st1last Orifice 1.2 Transport Velodty 3.7 frictional Head Losses loss through Disdl8fge 1.7
Lossin Transport 1.3 Loss through Valve 0.0 Loss in Manifold 0.2 Lossin Lalerals 0.1 Loss through Flowmeler 0.0 'Add~n' Friction Losses 0.0 Pi~e Volumes Vol of Transport Line 4.2 Vol
of Manifold 0.7 Vol of Laterals per Zone 7.5 Tolal Volume 12.3 Minimum Puml! Reguirements Design Flow Rate 23.6 Total Dynamic Head 17.3 indies feet inches feet feet inches feet indles
inches I feet feet % inches I:! feet I gpm 1 gpm ! % 'P' feet feel feel feel feet feet feel gals gals gals gals gpm feet 140~HH~44++++++++~HHHH4444++++++~HHHH 120 I+I++-I+I+++H-++I+I+H-H+H+++H+H-H-H
=+~H l ooHHHH~44++++++++HHHHHH+4++++++++~HHHH Net Discharge (gpm) Pum~Data Leg end PF5005 High Head Effluent Pump 50 GPM, 1I2HP 115/2llV 10 6!l-l Z, 2 o()':n OV 30 00 Hz System Curve:_
Pump Curve:_ Pump Optimal Range.;.. Operating POinO Design POinO
N ( \ ~ [ -I --------\.. \ -----,I O· 10' 20' SHE "" Scale: 1":: 20'-0" I~I \ _~ L~ I I r/\ 2-BEDROOM RESIDENCE I ~ --" '\ ~~-"~()I.. I L '\ OS' B ---\ WELL \ Srf.'"", " SHED 8-'lCk
~ \\ \ \ \ \ \ \ \ 0/''"if \ 1..& /\ \ I",'<-v \ I /\ I ~ ~ \l /.¥ ~: -...--/----J2...".,<.0 ____, THE LOCATION OF EXISTING AND PROPOSED IMPROVEMENTS SHOWN ARE NOT THE RESULT OF A PROPERTY
SURVEY, THE LOCATIONS ARE APPROXIMATE. IT [S THE HOMEOWNERS DUlY TO ENSURE ALL CONSTRUCTION AND IMPROVEMENTS LOCATIONS ARE ACCURATE. ALL SETBACK DISTANCES SHOULD BE CONFIRMED PRIOR TO
EXCAVATION. P.O. Box 2844 Glenwood Springs, Colorado 81602 Phone 970.618.5033 Fax 303.216.2796 (D SITE PLAN "01 TQ !iCM,E Maiolo Residence Mesa Street Garfield County. Colorado el047
/'\ /1 I :~ ~ I I I I I J Date: 08/20/13 W1.0 Designed By; Sheet 1 of4
Scale: 1" = 10'-,\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ /I /1 a~O-GALLON, TWO-COMPARTMENT CONCRETE SEPTIC TANK WITH PUMP 1.5" PUMP LINE TO LEVEL MANIFOLD 3 ROWS OF
8 A42 'ELJEN' MODULES. 12.8' x 33' BED /2-BEDROOM RESIDENCE SHED I IN 20' ~ I 8' PROFILE P,:? I I 4' PROFILE P7 /o //////////\ \ \ \1 \ \~ /""-y"5<..v //~ /P.O. Box 2844 Glenwood Springs.
Colorado 81602 Phone 970.618.5033 Fax 303.216.2796 _________ L /Maiolo Residence Mesa Street Garfield County, Colorado Number. C1047 ---////~l"'------DITCH 1+ CULVERT I I I (~NE DITCH
WITHIN O'OF ABSQR ION AREA) ./I I I I I I I I //Date: 08/20/13 W2.0 Designed By: 4
DESIGN 3-BEDROOMS (75 GAUPERSON/DAY x 2 PERSONS/BEDROOM X 3 BEDROOMS) AVERAGE DAILY FLOW:: 450 GALLONS DESIGN FLOW'" Q ;; 1.5 x 450 ;; 675 GALLONS TANK: 450 x 30 HOUR RETENTION TIME'"
843 GALLONS USE 1000-GALLON, TWO-COMPARTMENTTANK WITH PUMP ABSORPTION AREA: LONG TERM ACCEPTANCE RATE (LTAR):: 1.2 GAUSQ FT CALCULATED ABSORPTION AREA = OIL TAR:: 563 SF 25% REDUCTION,
DOSING TOTAL AREA RE9U1RED:: 423 SF 12,8' X 33' BED WITH 8 ELJEN GSF A42 MODULES 24 TOTAL MODULES WIDTH OF BED = 4 FT/MODULE X 8 MODULES +1 FT;; 33 FT LENGTH OF BED'" 423 SO FT I 33
:: 12.8 FT ROWS ON CENTER:: 12.8 FT { 3 ROWS =42 FT SPACING ON CENTER FINISHED GRADE SUP-ON PVC CAP DO NOT GLUE 'lit I--.J::. EFFLUENT LINE -4" SCHEDULE 40 OR 4" SDR SEWER LlNE-35 P.V.C.
4" SCHEDULE 40 P.V.C. INSULATED COPPER TRACER WIRE MAY BE INSTALLED TO LOCATE LINE IN FUTURE ® CLEANOUT DET Olhs bi P.O. Box 2844 Glenwood Springs, Colorado 81602 Phone 970.618.5033
Fax 303.216.2796 33' 1.25"LEV~~ 4+C, MANIFOLD /1.25" LATERALS ,8' 1.5"PU~ 4.2':O,C, 'EWEN' A-42 LINE 2' x 4' MODULES S-MIN. SAND I 12.8 AT PERIMETER I 10 0 01 (3) DRAIN FIELD D~1~Jil
SEED AND LOAM TO PROTECT FROM EROSION MIN, 12" MAX. 24"[ OF CLEAN FILL GEOTEXTILE FABRIC 13" SPECIFIED SAND J -j6" l-24" .1 6"r-36" • Maiolo Residence Mesa Street Garfield County, Colorado
C1047 (4) 'ELJEN' UNIT om ..... Date: 08120/13 W3.0 Designed By: Sheet 3 014
4-SDR 35 END CAP ~DRILL 1-112" HOLE IN END CAP 4~ SDR35 PIPE WI HOLES AT 4 & 8 O'CLOCK ==" ,..,....-4-SDR 35 END CAP ') I 5 0 0 Ie INSERT 1_1/2" SCH 40 PRESSURE LINE THROUGH END CAP
@END CAP DETAIL NOT II) SCAO..E ~VENTEDCAP ASTM C33 SPECIFIED SAND AT END " .• -'--BED EDGE OF LAST MODULE AT END OF ROW (2) VENT DETAIL P.O. Box 2844 Glenwood Springs, Colorado 81602
Phone 970.618.5033 Fax 303.216.2796 _m= Effluent Pumping Tank -1000-Gallon "'''''''' "'" "'" Ul "~"""'". Splice eo. 'l--"'" '"" FborgI ... Go!klted lid .. lh ... ,,;~ .... ~ .... 1InI1.
Ctomrnot(s) odopt .. 1Iith odbaivo) ,-". ~ ~"' .. ~ j If= '"~ '" .. EfOO r . :: :::: (oo ••• " .. , I !Quid .""" .:. Roc! Aftembly C~ ~ (opNonol) ~EtnuentP\lmp ~Jt--..""" II ~ ~ Pump
Vo"~ -PIoe«t on ~ flock Maiolo Residence Mesa Street Garfield County, Colorado Project Number. C1047 (8) TANK DETAIL lilil ,ijbit Date: 08120/13 W4,Q Designed By: 'f4