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is <br /> WALLACE•KUHL <br /> ErASSOCIATE=S INC. <br /> r PROBLEM ASSESSMENT REPORT <br /> LATHROP PROPERTY <br /> 91 East Thomsen Road <br /> Lathrop, California <br /> WKA No, 118 .02 <br /> January 30, 1992 <br /> INTRODUCTION <br /> Pur oss <br /> i <br /> -+• We are submitting this Problem Assessment Report for the property located <br /> at 91 East Thomsen Road in Lathrop, California (Plata 1). The purpose of <br /> work was to remediate petroleum hydrocarbon-contaminated soils and <br /> our <br /> to perform a preliminary evaluation of ground water quality beneath the <br /> 4.: property. Our work was authorized May, 1990,by currant property owners. <br /> I " Raymond M. Quarosma and Steven C. Mothershed, and has been <br /> t. d <br /> coordinated with San Joaquin County Public Health Service (SJCPHS), <br /> f_r rn Environmental Health Division personnel Eleanor Ratliff and Mary F.Meat's. <br /> SCO B <br /> The scope of our work, in chronological order, <br /> included. <br /> vn"j°`rrlf'i'GWIL),y research pertaining to site history [April, 19901 <br /> 4a r,, „r.,Ec„:,,,,ir,,,� hydrocarbon <br /> g <br /> • preliminary subsurface investiration for petroleum Y <br /> �,%;i contamination resulting from suspected former on-site underground <br /> storage tank(s) [Junor.1990 Soil Boring Report) ,.. <br /> + subsurface soils characterization and volume estimate of <br /> + ,> ti.,=�„•:E,T.°” contaminated soils (September, 1990 -,Environmental <br /> Srte <br /> Assessment) <br /> contaminated soils excavation and preliminary ground water quality <br /> L . . . <br /> E,it,i. investigation(October;i9'�OWorkplan for Soils`Rerljed+atian/Ground..: <br /> r ; Water Investigation) <br /> 04 <br />