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Home My WebLink AboutOWTS Design Packet 04.06.2020CAPSTONE ENTERPRISES WEST, LLC GEOTECHNICAL AND MINING ENGINEERING TESTING AND INSPECTION SERVICES 618 PARTEE DRIVE GRAND JUNCTION, CO 81504 PHONE (970) 250-3331 April 6, 2020 JOB # 4519 Attn: J Caliber Construction Rifle, CO Subject: Percolation Test and On -Site Wastewater Treatment System Design for 15 Native Springs Rifle, CO 81650 At your request Capstone Enterprises West, LLC directed and observed the excavation of the two test pits to evaluate onsite soils for design of an additional On -Site Wastewater Treatment System (OWTS). The suitability of soils was evaluated by soil classification as prescribed by the Garfield County Health Department, and confirm by performing a percolation test, The results of investigation and the percolation test with the OWTS design are presented in this report. If you have any questions, or if we may be of further assistance, please do not hesitate to contact us. Respectfully Submitted: CAPSTONE ENTERPRISES WEST, LLC Martin W. Chenoweth, PE Registered Professional Engineer MWC CAPSTONE ENTERPRISES WEST, LLC 2 JOB NUMBER 4519 PERCOLATION TEST Per your request, Capstone Enterprises West, LLC performed a percolation test for your 3 bedroom residence. The test was performed as prescribed by the Garfield County Department of Public Works' regulations updated on July 2nd, 2018. The property is located in the north half of Section 11 Township 6S Range 93W. The following images show the site location as well as the location of the profile holes. CAPSTONE ENTERPRISES WEST, LLC 3 JOB NUMBER 4519 SITE DESCRIPTION The property is a 5.09 acre parcel that was undisturbed grazing land and flood irrigated farmland until the development of the subdivision. The eastern half of the property generally flat with a gentle slope to the west of —1 %. Two test pits were excavated to determine the soil types at this location. The profile hole was excavated to a depth of 8 feet. No free water was encountered to that depth, nor was there evidence of a seasonal high water table. The geologic log of the profile hole is presented below. TP-1 Brown Clay PI=15 Brown Silty Clay Dry Density = 115.5 pcf Moisture = 16.7% TP-2 Topsoil Silty Clay w/ Roots Brown Silty Clay Sandy Slit Brown Clay 10 . 10 The soils at the site were consistent between the two excavations. The soils that will utilized for the absorption bed are a fine grain clayey silt (GR) with weak structure. To confirm this classification an abbreviated percolation test was performed. A total of 3 perk holes were dug to evaluate the percolation rates. All holes were moisture conditioned as prescribed by Garfield County Health Department. And the percolation test was performed 24 hours after the initial conditioning. The results for the percolation test are presented on the following page. CAPSTONE ENTERPRISES WEST, LLC 4 JOB NUMBER 4519 HOLE ID & DEPTH ELAPSED TIME min. WATER LEVEL in. WATER DROP in. PERCOLATION RATE nun.lin. PH-1 0.0 0.00 0.00 44 - 60" 30.0 1.25 1.25 60.0 2.13 2.13 90.0 3.63 3.63 120.0 4.63 4.63 30.00 PH-2 0.0 0.00 0.00 30 - 46" 30.0 1.00 1.00 60.0 1.63 1.63 90.0 2.38 2.38 120.0 3.50 3.50 26.67 PH-3 0.0 0.00 0.00 0 - 16" 30.0 1.38 1.38 60.0 2.63 2.63 90.0 4.00 4.00 120.0 5.25 5.25 24.00 AVERAGE 26.9 20.00 18.00 16.00 14.00 t 12.00 v 10.00 t 8.00 6.00 4.00 2.00 0.00 Water Drop Vs. Elapsed Time PH-1 PH-2 PH 3 lfmlts 0.0 20.0 40.0 60.0 80.0 Elapsed T1me (minutes) Job No.4519 15 Native Springs CAPSTONE ENTERPRISES WEST, LLC 5 JOB NUMBER 4519 100.0 120.0 The average of the for the last 30 minutes of the two-hour test was 26.9 minutes per inch. Capstone believes that the un-official percolation test confirms the classification as a type 4 soil. Based Garfield County Guidelines, the system has been designed based on a Long Term Acceptance Rate (LTAR) 0.50. Table 10.1 Sell Treatment Area Lann•larnM1 Acceptance Rates by Soil Texture, Soil Structure, Percolator' Rate and Treatment Leval -- - - Lane -team Acceptance Rate (LTARt. Onllatar per day acumen loot Hod Tyne 0 3 5401 Type, TesW I, Structure and Percolation Rata R roc USDA Sad USDA Soli Slnatu,- Stratum - USDA Soil Texture Shape Onda Sal Type t M11h mat Man 30% Rodr. 0.2re11m0. Rae Types 20 win mare then 50% Rack (4ertn) Sand, Loamy Sand 4 Sandy Loam, Loam Se Learn Sandy Lam. Lam, SR Lam SaodyCrey Loam, Clay l near, Say Croy Loam Sandy CleyLoom, Clay Loon, Slat My Loam Spit! Clry, Clay, My Lary Study CYy , 81W Can Percolation Rate (MPII PR (Ptameticl SK p11 c511) cR (Granular) WOK. GR 0lttartel PR, BK 0R 0 011112. Gait) 2 (Moderate) 3 (Sang) 1 (Weald areadvo a1 Treillage Level 1' Una = 3-foot dap unlined andRaer mutate Treatment I Treatment Lv..t 2' Level 271' 10-25 ago 0.50 Treatment Troabnont Lava 3' Leval 3M'' high elm 2-Poet dap paned and 5bp recap 050 0.110 0.70 090 0.70 1.00 OLIO 1.00 0.50 2, 3 41-00 0 35 Mcealva e1.75 0.30 0.60 0A0 PR, Bit, OR 2, 3 0.20 0.30 0.50 0.e0 0.30 0.e0 0.e0 010 0.10 0.30 0.30 OI K 0 1 WNW .F5 Ss1T1pea 2-4A platy 1, 2, 3 121 ♦ 0.10 0.11 NOTE. Shaded area require system desert by a proleasena engineer 1 T talment levels are delwud in Table 6-3. 2 Unlined sand Alla n these !al typal shah perfidy pathogen removal. Design shall conform to team 11 C 2 c. Unlined Sand Fain • Maher aeg lorrn accalagp rites for Treatment Lend 3N may be awned roc OW TS marred to have a dlsdrarge perm!. Tore capebnay or the design to achieve a higher long-term rv-eplerrco Tate can ale gyMi1211121r, 01-120 0.15 0.20 0.20 021E 0.20 CAPSTONE ENTERPRISES WEST, LLC 6 JOB NUMBER 4519 0.15 0.10 0.15 WASTE WATER TREATMENT SYSTEM DESIGN The proposed residence for this site is planned to be a four (4) bedroom dwelling. Using the guidelines in the Garfield County On -Site Wastewater Treatment System Regulations, Effective Date: July 2. 2018 (OWTSR) the following sewage flow calculations were prepared: 3 Bedroom Residence Table 6-1 Q =450 gal. /day Once again using the OWTSR the absorption area was calculated. Where: A = Absorption Area in square feet Q = Design Flow of sewage in gallons/day LTAR = Long Term Acceptance Rate (From Table 10-1, OWTSR) AREA Q 450 LTAR 0.5 Base Area Size Adjustment Factors Gravity Bed Chambers 900 sq. ft. 1.2 0.7 Total Absorption Bed Area 756 sq. ft. 900 sq ft To obtain 756 square feet of absorption area two 12 foot wide beds 68 feet long (64 Chambers plus end caps) are required. A two compartment 1,000-gallon septic tank is required for this system. Capstone recommends that a concrete tank approved by Garfield County be used for this system. Detailed plans are attached. The following table shows the distance pertinent to this system. CAPSTONE ENTERPRISES WEST, LLC 7 JOB NUMBER 4519 m 43.7Minimum Distances Between Components of an On -site Wastewater Treatment System and Physical Features Table 7-1 Minimum Horizontal Distances in Feet Between Components of an On -Site Wastewater Treatment System Installed After November 15, 1973 and Water, Physical and Health impact Features Spring, Well,' Suction Line, Potable Water Supply Cistem4 Potable Water Supply Line 2 Structure w/basement, crawl space or footing drains Structure without basement, crawl space or footing drains Property Lines, Piped or Lined Irrigation Ditch, upslope curtain drain Subsurface Drain, Intermittent Irrigation Lateral, Drywell, Stormwater Structure Lake, Water Course, Irrigation Ditch, Stream, Wetland Dry Gulch, Cut Bank, Fill Area (from Crest) Septic Tank, Higher level treatment Unit, Dosing Tank, Vault or Privy Septic Tank, Higher Level Treatment Unit, Dosing Tank, Vault or Vault Privy 50 2 10 2 5 5 10 10 50 10 - _ Building Sewer or Effluent Lines 50 2 5 6 0 0 10 2 10 2 50 2 10 2 -- STA Trench, STA Bed, Unlined Sand Filter, Sub -surface Dispersal System, Seepage Pit 100 3 25 2 20 10 10 25 50 3 25 5 Lined Sand Filter 60 10 2 15 10 10 10 25 10 5 Lined Evapo- transpiration Field or Outside of Berm of Lined Wastewater Pond 60 10 2 15 15 10 10 25 10 5 Unlined Sand Filter in Soil With a 100 25 2 15 15 10 25 25 15 10 Garfield requires that every OWTS be inspected by the to receive an occupancy clearance for the new construction. Please make arrangements with the engineer to schedule an inspection once the system is installed but before the bed is backfilled. The installer is responsible to maintain the appropriate offsets and grades. Any deviation from the plans must be approved by the engineer. The recommendations contained in this report are made in a manner consistent with the level of care and skill used by geotechnical engineers practicing in this area at this time. This report contains no warranty either express or implied. CAPSTONE ENTERPRISES WEST, LLC 9 JOB NUMBER 4519 "i: xnx cHABEk BED :ex-4 cii3OSON ice ki:V) ■ FIi AtR AREA PROPERTY OS '* LOU GAL ;AN( REV. DATE DESCRIPTION BY CK CAPSTONE ENTERPRISES WEST, LC 618 PARTEE DRIVE GRAND JUNCTION, CO 81504 PHONE (970) 250-3331 OWTS GENERAL ARRANGEMENT 15 NATIVE SPRINGS DRIVE RIFLE, COLORADO BY M W CHENOWETH ❑ATE 111120 SCALE 1'4DQ martin capstonewest.com PROJECT NO. 4519 'SHEET NO.10F2 D-BOX 4" DISTRIBUTION LINES Inspection Ports Capped 12" Above Ground UNCOMPACTED SOIL CAP (MOUND5%) — FILTER FABRIC OVER CHAMBERS — 4" PERFORATED DISTRIBUTION LINES ENTIRE LENGTH OF BED PERFORATIONS DOWN Max Depth 4.0 Ft BED IN SECTION EACH BED MADE UP OF 64 QUICK-4 INFILTRATOR CHAMBERS (OR EQUIV.) BED TO SLOPE DOWN 0.2% FROM D-BOX REV. DATE DESCRIPTION BY CK CAPSTONE ENTERPRISES WEST, LLC 618 PARTEE DRIVE GRAND JUNCTION, CO 81504 PHONE (970) 250-3331 OWTS CONSTRUCTION DETAILS 15 NATIVE SPRINGS DRIVE RIFLE, COLORADO BY M W CHENOWETH (DATE 4/6/2° I SCALE NTS 'SHEET NO. 20F2 martin@capstonewest.com PROJECT NO. 4519