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August 14,2007 <br />Project Number 55.07 L"r r.\',,{~)I(,JUIJ''.-,_,; <br />"FOR:Mr.Paul Bowman <br />Cochran Properties,PTP <br />2206 Goodwin Avenue <br />Penngrove,CA 94951 <br />(707)765-6828 <br />ocr -S 2007 <br />PROJECT:A.P.N.239-110-04 <br />25354 South Bird Road <br />Tracy,CA 95304 <br />Zoning:AG-40 <br />SUBJECT:Percolation Testing and Water Table Depth Determination for Farm <br />LaborlResidential Septic Systems <br />INTRODUCTION <br />Chesney Consulting has been retained by Mr.Paul Bowman to conduct percolation testing on <br />agricultural property owned by Cochran Properties at the above-referenced Project site.The perc <br />test procedures were done to determine the suitability of the soil to accept domestic wastewater <br />flows from four proposed mobile homes that are to house farm labor employees. <br />The entire subject property area consists of a 256.8 acre Parcel.Within the subject Parcel,as <br />noted on the San Joaquin County District Viewer Map,is a 40-acre Parcel unrelated to the <br />subject property.The four farm labor residential mobile homes are proposed to be installed <br />approximately 60 feet north of the north property line of this 40-acre Parcel,near the center of <br />the property line.Consequently,the percolation tests were conducted in this area. <br />Additionally,there are two newly drilled ag wells located in this same locale,approximately 335 <br />feet apart from one another.Also noted is a third ag well which was drilled approximately two <br />weeks ago,and is located close to Bird Road. <br />The policy of the San Joaquin County Environmental Health Department (EHD)is for the <br />installation of a septic system disposal field to be within 100 feet of percolation tests conducted <br />for any proposed leachfield.Acceptable percolation in the shallow soils was achieved and it can <br />be assumed that equivalent permeability exists within the 100-foot radius.Permeability was not <br />tested at the deeper depths representative ofsumps or seepage pits due to the water table at 9.5 <br />feet below existing grade.The percolation test locations,backhoe test pit,the two referenced <br />wells locations,and 100-foot radius lines are depicted on the attached Site Plan Schematic found <br />in Appendix B. <br />Page -1- <br />'------P.O.'Box 3794 •Turlock;C.Jt 95381 •Office (209)668-1403 •:fax (209)668-2598