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Home My WebLink About20220183.tiffItem 1.4 EARTH ENGINEERING June 10, 2019 COMPANY, INC. Daryl Bohlender (dbohlendercc�,rmail.com) 22240 Weld County Road 39 LaSalle, CO 80645 Re: Test Pit. Observation Results Proposed Leachfield Preliminary Results Proposed 3 Lot PUD 22240 Weld County Road 39 Weld County, Colorado EEC Project No. 19-01-049 Mr. Bohlender: On June 7a', 2019, Earth Engineering Company, Inc. (EEC) personnel completed the test pit observations at the site you requested for the above referenced project. To complete the site percolation testing, EEC personnel observed (2) soil profile test pits to a depth of approximately 8 feet below present site grades. The logs of the 8 feet deep test pits are included with this report. The materials encountered in the profile test pits at the proposed leachfield sites generally consisted of dark brown sandy loam (Soil Type 2A) soils underlain by grey to brown sandy clay loam (Soil Type 3A) soils at a depth of approximately 4 feet below present site grades which extended to the depths explored. At the time of excavating, groundwater was observed in the test pits at a depth of approximately 7 feet below present site grades. The approximate high groundwater level appeared to be at a depth of approximately 4 feet below present site grades. Based upon the visual soil classification, the near surface site soils classify as sandy loam (Soil Type 2A), which corresponds to a percolation rate of 26 to 40 minutes per inch. Soil Type 2A classification along with a percolation rate of 26 to 40 minutes per inch should be assumed in the design. Weld County standards also require that neither groundwater nor bedrock be encountered within 6 feet below ground surface in the area of a conventional absorption field. The test pits completed indicates the near surface site soils do not meet the soil and groundwater criteria based on the observed approximate high groundwater level at a depth of approximately 4 feet below present site grades and the deeper site soils classify as a sandy clay loam (Soil Type 3A) which corresponds to a percolation rate of 61 to 75 minutes per inch. Based on the results as outlined above, it appears an engineered septic absorption system could be used for the residences. In siting RU Box 271428, Fort Collins, CO 60527 phone: 970 775.2004 fax: 970.553.0282 Earth Engineering Company, Inc. EEC Project No. 19-01-049 June 10, 2019 Page 2 of the absorption field, Weld County criteria concerning proximity to drainage ways, property lines and other site features should be addressed. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning this report, or if we can be of further service to you in any other way, please do not hesitate to contact us. Very truly yours, Earth Engineering Company, Inc. Michael J. b1d, P.E. Principal Engineer MJC/sl1 N Not To Scale 0 LOT 2 LOT 1 � IITING RESED GE 2224© u TP-1 I SLIGHT SLOPE APPROXIMATE LEACHFIELD LOCATION SLIGHT SLOPE EXISTINBUILDING LTP--2 APPROXIMATE LEACHFIELD LOCATION FI LEGEND TP-7 TEST PIT LOCATION 4 SITE PHOTOS PHOTOS TMCIX FROM APPRO.GMATE SYMBOL LOCAACWI N DREONON OF ARROW TEST PIT LOCATION DIAGRAM 22240 WELD COUNTY ROAD 39 WELD COUNTY, COLORADO PROJECT NUMBER: 19-01--049 DATE: JUNE 2019 EARTH ENGINEERING COMPANY 22240 WCR 39 WELD COUNTY, CO EEC PROJECT No. 19-01-049 JUNE 2019 EEARTH CNOMPANY. INC. 22240 WCR 39 WELD COUNTY, CO EEC PROJECT No. 19-01-049 JUNE 2019 EARTH [9®® C COMRI�MPA-DING NY, INC. 22240 WELD COUNTY ROAD 39 WELD COUNTY, COLORADO PROJECT NO: 19-01-049 DATE: JUNE 2019 LOG OF TEST PIT NO. 1 RIG TYPE: BACKHOE SHEET 1 OF 1 WATER DEPTH FOREMAN: SM START DATE 61712019 WHILE EXCAVATING 7 AUGER TYPE: NIA FINISH DATE 6/712019 HIGH WATER LEVEL 4' SPT HAMMER: N/A SURFACE ELEV NIA 24 HOUR NIA SOIL DESCRIPTION 0 N qu MC Do A -LIMITS .200 SWELL LL I P1 PRESSURE %@ 500PSF TYPE FEET BLOWSIF- PSF 1%) (PCF) (4DI 6" TO 8" TOPSOIL AND VEGETATION 1 SANDY LOAM (SOIL TYPE 2A) _ dark brown/rust 2 structureless _ _ BS 3 -- — 13.1 4 5 SANDY CLAY LOAM (SOI L TYPE 3A) BS - - 20.7 36 24 50A grey to brown _ structureless 6 calcareous deposits _ BS 7 — -- 21.5 8BOTTOM OF TEST PIT 9 10 it 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Earth Engineering Company 22240 WELD COUNTY ROAD 39 WELD COUNTY, COLORADO PROJECT NO: 19-01-049 DATE: JUNE 2019 LOG OF TEST PIT NO. 2 RIG TYPE: BACKHOE SHEET I OF 1 WATER DEPTH FOREMAN: SM START DATE 6/712019 WHILE EXCAVATING 7 AUGER TYPE: WA FINISH DATE 617/2019 HIGH WATER LEVEL 4' SPT HAMMER: N/A SURFACE ELEV NIA 24 HOUR N/A SOIL DESCRIPTION U N QU Mc DO A -LIMITS -200 SWELL LL PI PRESSURE %@ 500 PSF TYPE (FEET) (BLOWSIM (PSF) (%y (P'r) I%) 6" TO S" TOPSOIL AND VEGETATION t SANDY LOAM (SOIL TYPE 2A) dark brown 2 structureless _ BS 3 -- -- 15.6 NL NP 36.4 4 5 SANDY CLAY LOAM(SOILTYPE3A) BS -- -- 22.4 grey to brown _ structureless 6 calcareous deposits _ BS 7 -- -- 24.8 greylbrown/rust. 8 8' BOTTOM OF TEST PIT 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Earth Engineering Company Earth Engineering Company, Inc. Summary of Laboratory Gradation Test 100.0% 90.0% 80.0% 70.0%. Y v 60.0% .o 50.0% H 40.0% 30.0% 20.0% 10.0% 0.0%u 100 10 1 0.1 0.01 0A01 Grain Size in Millimeters Sieve Size Percent Passing No. 4 100% No. 10 100% No. 40 86% No. 200 50% Project: 22240 Weld County Road 39 City Location: Weld County, Colorado Project Number: 1901-049 Date: June 2019 Sample Location: TP-1, S-2 @ 4' Description: Grey Sandy Clay Loam 9919EARTH ENGINEERING COMPANY, INC. Earth Engineering Company, Inc. Summary of Laboratory Gradation Test 100.0%I -lc_-- 90.0% 80.0 70.0% co 60.0% 50.0% 40.0% 30.0% 20.0%- 10.0% 0.0% 100 10 1 0,1 0.01 0.001 Grain Size in Millimeters Sieve Size Percent Passing No. 4 100% No. 10 100% No. 40 73% No. 200 36% Project: 22240 Weld County Road 39 City Location: Weld County, Colorado Project Number: 19-01-049 Date: June 2019 Sample Location: TP-2, S-1 @ 2' Description: Dark Brown Sandy Loam ®[9 9EAPTH ENGINEERING C. Hello