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71 <br /> September 4, 2020 <br /> FOR: Mr. Jose Jesus Velazquez <br /> 3667 Dakota Avenue <br /> Riverbank, CA 95367 <br /> 209-324-0588 <br /> PROJECT: Proposed Single Family Residence <br /> 9401 South Biedermann Way <br /> APN 205-190-21 <br /> Escalon, CA 95320 <br /> SUBJECT: Soil Percolation Testing Report for Onsite Wastewater Treatment System(OWTS) <br /> Effluent Disposal. Project Number ST-65.20 <br /> INTRODUCTION <br /> Chesney Consulting has been retained by Mr. Jose Jesus Velazquez to conduct soil permeability <br /> (percolation)testing at the above-referenced project site. The purpose of this testing was to <br /> determine the permeability of the underlying soils in the proposed location of effluent disposal <br /> from the Onsite Wastewater Treatment System(OWTS) for his new house. Additionally, <br /> information from the percolation test results has been correlated with the effluent disposal volume <br /> the receiving soils can manage. Test locations were determined by Mr. Velazquez as the project <br /> owner and are illustrated on the Percolation Test Rate Data Sheet under Location of Test Holes. <br /> The domestic well for this project has been installed at the south end of the property and is the only <br /> improvement made to the property as of the date of this Report. <br /> MATERIALS AND METHODS <br /> On August 27, 2020,testing began by boring a 25 ft test hole with a B-24 Mobile Drill Rig and <br /> solid stem auger to log soil characteristics to this depth. This 25 ft depth represents the maximum <br /> depth of a seepage pit and the location of this project is considered by the Environmental Health <br /> Department(EHD)to be in an area where seepage pits can be installed. From the lithology data <br /> obtained from this 25 ft test boring,two separate perc tests borings were prepared in the deeper <br /> strata that exhibited favorable permeability characteristics, in addition to a shallow test boring. <br /> The shallow 40"test boring was drilled first and represents permeability at typical leachline depth. <br /> The sidewalls of this test hole were scarified with a pry bar to open smeared soil surfaces. The <br /> second boring was completed to 13 8" (11.5 ft) depth and the third test boring was set at 220" (18.4 ft) <br /> deep. A percolation test was not conducted in the 25 ft exploratory boring since clay was <br /> encountered from 21 ft to 25 ft. <br /> The borings were sleeved with 3" slotted PVC pipe to mitigate potential cave-ins and as the <br /> reference measuring point. Two inches of gravel was placed at the bottom of each test boring to <br /> prevent scour. <br /> Page 1 of 3 <br /> P.O. Box 3794 ❑ Turlock, CA 95381 ❑ 209.402.1652 ❑ ddchesney@charter.net <br />