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Home My WebLink About20003108.tiff PERCOLATION TEST RESULTS AND SEPTIC SYSTEM RECOMMENDATIONS PART OF THE SEW OF SECTION 18, T.6N. , R.64W. OF THE 6TH P.M. , WELD COUNTY, COLORADO FOR MIKE JONES CDS ENGINEERING CORPORATION LOVELAND, COLORADO PROJECT NUMBER 00-0426 . FEBRUARY 14, 2000 _ I EXHIBIT � ff 2000-3108 CDSEngineering Corporation February 14 , 2000 Project No. 00-0426 Mr. Mike Jones 33153 WCR 51 Greeley, CO 80631 Dear Mike, Enclosed is the report you requested of the percolation test results and septic system recommendations for the proposed building to be located on part of the SVA of Section 18, T. 6N. , — ^ R. 64W. of the 6t' P.M. , Weld County, Colorado. _ The site is suitable for the construction of the proposed septic system, provided the design criteria and recommendations given in this report are met. If you should have any questions concerning the information in the report, please feel free to contact this office. Respectfully, CDS ENGINEERING CORPORATION Reviewed By: <++”,.^,r..., 41. k, ��a • Robert R. Greenwald II, E.I.T. ony J We w5 d/141 � E RRG/add Enclosures 165 2nd Street S.W. • Loveland, CO 80537 • (970)667-8010 • Fax: (970) 667-8024 TABLE OF CONTENTS Page Letter of Transmittal i Table of Contents ii Scope 1 Site Investigation 1 Site Location and Description 1 Subsoil and Groundwater Conditions 1,2 Percolation Test Results 2 Combination Absorption and Evapotranspiration Area 2, 3 — Required Septic Tank Size 3 Septic System Recommendations 3 Conclusions 3 Location of Test Borings Drawing No. 1 Symbols and Soil Properties Diagram No. 1 Log of Borings Drawing No. 2 Combination Absorption and Evapotranspiration System Drawing No. 3 General Maintenance Recommendations Appendix I ii 1 SCOPE This report provides percolation test results and septic system recommendations for a proposed building to be located on part of the SE1/4 of Section 18, T.6N. , R.64W. of the 6th P.M. , Weld County, Colorado. SITE INVESTIGATION A field investigation, performed on January 19, 2000, consisted of digging one (1) test hole to a depth of eight and one half feet (81/2' ) and six (6) percolation holes to an average depth of thirty (30") . Percolation tests were performed on January 20, 2000. The Location of the Test Holes is shown on Drawing No. 1. A Log of Borings are shown on Drawing No. 2. SITE LOCATION AND DESCRIPTION The site is located northeast of The City of Greeley, Weld County, Colorado, south of the Town of Galeton. The site is relatively flat, and vegetation consists of various grasses and weeds. SUBSOILS AND GROUNDWATER CONDITIONS Topsoil - Approximately six inches (6") of topsoil overlies the site. The topsoil should be stockpiled and used as backfill over the absorption field. Sandy Lean Clay- Brown, medium stiff, slightly moist to moist clay was encountered beneath the topsoil to a depth of five feet (5' ) . Sedimentary Bedrock Sandstone- Brown-green, weathered, slightly moist sandstone was encountered beneath the sandy lean clay to a depth of eight and one-half feet (8'/z' ) , where drilling operations _ ceased. Groundwater was encountered in the test holes twenty-four (24) hours after drilling at a depth of seven feet (7 ' ) . 2 PERCOLATION TEST RESULTS A total of six (6) percolation tests were run on the site, using the Standard Test Method, as described by the Weld County Health Department . Percolation test holes were presoaked on January 19, 2000, and the test was performed on January 20, 2000 . Test results varied between 30 and 120 minutes per inch with an average of 72 minutes per inch. Percolation Hole Percolation Rate (MPI) PH 1 30 PH 2 60 PH 3 80 PH 4 80 _ PH 5 60 PH 6 120 Avg. 72 COMBINATION ABSORPTION AND EVAPOTRANSPIRATION AREA STANDARD DESIGN From Pages 28 and 35 from the I .S .D. S .R. for Weld County: Absorption Area (Aa) = O / T x 1 .3 , and 3 . 5 Evapotranspirations Area (Ae) = O x 586 rate (in/yr) Lake Evap. Q = Estimated maximum quantity of sewage flow in gallons per day = ADF x 150% T = Percolation Rate in minutes per inch = 72 min/in Lake Evaporation rate at the site = 46 in/yr Since the percolation rate is 72 min/inch and only 60 min/in can be used for absorption, 607 min/inch . 83 = 83% of the flow can be used for absorption. Therefore, 17% must be used for evaporation. 3 Therefore, 17% must be used for evaporation. Therefore, Aa ( . 83) Q / T x 1 . 3, and Ae = ( . 17) Q x 586 3 . 5 46 The proposed structure is to be a office/warehouse facility with approximately ten (10) employees . Therefore, Q= 10 workers x 15 gpd/worker x 150% = 225gpd Therefore, the recommended septic field size is : Qt Absorption Area (Sq. Ft) 225 1076 REQUIRED SEPTIC TANK SIZE Minimum Tank Capacity (gals. ) 1, 000 SEPTIC SYSTEM RECOMMENDATIONS Recommended is a compartmented septic tank of the required size to be followed by a combination absorption and evapotranspiration field with a bottom area of 1200 square feet. The bed should be constructed in accordance with Section 5. 6 and 6.2 of the I.S.D.S.R. for Weld County (see Drawing No. 3) . To _ maintain the minimum four feet (4 ' ) of suitable soil between the bottom of the bed and any limiting zone (bedrock) , the bottom of the bed should be limited to one foot (1' ) below original grade. Therefore, the bed area will need to be mounded a minimum of one foot (1' ) . A vertical liner per the I.S.D.S.R. for Weld County is required around the bed area, where the bed gravel is placed above original grade. The bed should lie a minimum of ten feet (10 ' ) from property lines and twenty feet (20 ' ) from the proposed residence. This system is to meet all rules and regulations set forth by the Weld County Health Department. The system is to be inspected by a representative of the Weld County Health Department prior to backfilling. 4 CONCLUSIONS All future owners are to be directed to information in Appendix I (General Maintenance Recommendations) of this report . The findings and recommendations of this report have been obtained — in accordance with accepted engineering practices in the field of Geotechnical Engineering. There is no other warranty, either expressed or implied. • BORING LOCATION PLAN PART OF THE SE 114_, SECT. 18, T. 6 N., R. 64 W. WELD COUNTY, COLORADO WCR 51 — — — r EXISTING K BULDRIG e J ,H2 ♦ PH3 PH4 ♦ ♦ Pits P112 i e IPH e ;1 NoPo5E0 tEP'UC Flat Welk-nok - SCALE: NTS PROJECT NO.: 99-0426 DATE: 2/3/00 CD L+ Engineering DRAWING NO.: 1 _ FIELD BOOK: �`7 Corporation REVISION NO.: DRAWN: RRG 165 2nd St. S.R. CLIENT: MIKE JONES Loveland, CO 80537 CHECKED: AJW Tele: (970) 667-8010 ' SHEET 1 OF1 SYMBOLS AND SOIL PROPERTIES Ot;GaAM NO. 1 SOIL AND ROCK SAMPLERS CLAY (CL.0L,MH,O1.CH) ' CALIFORNIA SILT (ML,OL) THIN-WALLED iii. SAND (SW,SP,SM,SC) SPLIT BARREL • £ GRAVEL (GM,GP,GM,GC) BAG SAMPLE — ♦♦iii WEATHERED ROCK PITCHER man SHALE & CLAYSTONEELe , _ I JAR SAMPLE SANDSTONE • _PENETRATION RESISTANCE FOR COHESIONLESS SOILS ON STRENGTH CLASSIFICATIONS FOR COHESIVE SOIL BASIS OF THE STANDARD PENETRATION TEST NUMBER OF BLOWS PER FT. . N * RELATIVE DENSITY CONSISTENCY COHESION, KSF'ti'' 0 - 4 VERY LOOSE SOFT LESS THAN 0.5 4 - 10 LOOSE FIRM 0 .5 - 1 .0 10 - 30 MEDIUM STIFF 1 . 0 - 2.0 30 - 50 DENSE VERY STIFF 2 .0 - 4 .0 OVER 50 VERY DENSE HARD GREATER THAN 4 .0 * BLOWS PER FOOT - BLOW OF 140' LB, ' * EQUIVALENT TO PP/2 AND OU/Z HAMMER DROPPED 30 IN. TO DRIVE 2- INC. SPLIT-BARREL SAMPLER ONE FOOT (ASTN OL586-67 ) . P� LOG OF BORINGS '[PH PNI PN1 PN3 PPM PNT PAL c. . F. TnPSOh - '.TIII'.7 'MA'S' 'f C • •/ �•� • —aia.. FM.• 4tHfrPRAbewail medals% 4-4 tprimaimef e8OUr4'- !E_ frisieft MIN) l-n-CO. DRAWING N0. �.Ge wabe Lela VI 4434.6 Awe oeuu Z E07 CDS ENGINEERING CORPORATION No. 00- 046 COMBINATION ABSORPTION AND ' EVAPOTRANSPIRATION .SYSTEM. SYSTEM. 1. Bottom surface of bed should be roughened before con- • 4' PVC PERFORATED (TYP) struction of bed and trenches to avoid having a pene ALL ENDS INTERCONNECTED tration resistant interface between natural soil and fill. 1 2. Distribution pipes should be laid level. The pipes should be interconnected for beds. / 3. A layer of straw or paper shall be used between the gravel and backfill. Four inches (4") of "pea" grav- el may be substituted for the straw or paper. 4. Backfill shall consist of natural on-site material. Heavy clays should not be used as backfill. The up- i per four inches (4") shall be suitable soil for sup- ALL LINES porting vegetation. TO LAY 5. Top of bed shall be side-sloped about two percent (2%) and promote positive drainage away from bed. LEVEL X The maximum slope for any septic system is thirty percent (30%). f-- < , . 2 6. Surface 'of bed not usable under traffic areas, eith- -I er animal or machinery. Vegetation over bed should • o be durable and tolerate both wet and dry periods. A A 7. Surface of bed and trenches should receive sunlight. • Shade trees near system not recom ended. 8. This system to meet all applicableld6r-0 County a l 1 � Health Department Rules and Regulations set forth in DIST-RIBUTION BOX / the Individual Sewage Disposal System Regulations. INLET�a •-•—g. 18 -36' 9. A representative of CDS ENGINEERING CORPORATION `and the WELD County health 6erart-:er,t should 6� MAX. be contacted for inspection prior to placement of backfill. Inspections by the Engineer are an addi- tional charge. 2% SIDE SLOPE. BED-TRENCH AREA(S.F.) 1 ` / ROTE: 4%41} t 0r I NaN�v ws v y 6 ►eto0 f t /Ai " '4-'----.. -WICtING I 12' MIN. . 6u\c,itg-IwItit -IL ni,c( r SEE NOTE 3 550,04D I WICKING m I 3 2• ! 1 SAND 7 1Mouvas 5�wit. MIN. .. ♦ . ;;moo � �o. • �� c (3.JL •.:••..1. •:•t ' t ..Fr4j:L J�. 6' MIN. • t7 REMARKS: �o Vr,alwb:�+ 4 yNa. Soilaup fe.4 bet wee" •�a°i p. ?• 30: O•,. ... �4. 1 12'-M I N.1 %�u�k A( p I.a.t b ecivak, +Le bo t o-c 4 b� 6141 6e l Lq vle w o►'10.1 vale. f,,e / ~` • i o.i44 W,i4• f V MCI:c,I Nov 4e!u r.e4 AYeu I.J uAE 3/4' TO 2 1/2' WASHED PERFORA IONS eyo.4 adovt 0r 'e al am p. 1 ROCK OR EQUIVALENT FACING DOWNWARD CLIENT: 1fn 501E5 PROJECT NO.: t0-o(2 SECTION A-A DRAWING NO.: 3 S • - CDS ENGINEERING CORPORATION •Pa,'ibi•C•e• , e....., -._ APPENDIX I GENERAL MAINTENANCE RECOMMENDATIONS FOR INDIVIDUAL SEWAGE DISPOSAL SYSTEMS The following recommendations, if followed, should help increase the lifetime of the system: 1 . Septic tanks should be pumped a minimum of once every four years . 2 . Septic tanks and distribution boxes should be checked at — least once a year for sludge accumulation which may clog the leach area if overflow occurs . 3 . The leach area should not be used for grazing, sports activities, traffic, or other activity which may compact the soils . 4 . Schedule 80 pipe should be used if lines are to be placed under driveways . 5 . Trees should not be planted near the leach area so as to prevent roots from clogging the system. — 6 . If trees are to be planted nearby, they should be located so that the leach area is not shaded. 7 . Overuse of strong chemicals, which may kill the bacteria in the system and inhibit decomposition of the sewage, should be avoided. 8 . Positive drainage should be maintained over and around the absorption field area to prevent pooling of water. 9 . Lines to the tank or leach area should have sufficient ground cover to prevent freezing. REV 07/10/96 Hello