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,l Rf.5.\',1 Cnmp,uy <br /> Enrirurrnuvr6rl Sulydiurrc <br />_ rlrruuglr Applied Science, <br /> i I 1-t 6141 -1[1Ipt}oitt, '"wile 200 Engineering 8 Cuns}ruction <br /> f•k <br /> I�,i,u lin( untnt,i,CA'};I,,[I <br /> I'ltom.€9101 85r-0090 <br /> fA\i'311�i fl'�?-(�0�liti <br /> C-+ <br /> February 20, 1992 <br /> Mr. Kenneth R. Earnest <br /> Ultramar Inc. <br /> 525 Nest Third Street <br /> Hanford, California 93230 <br /> Subject: Ground-Water Monitoring. Fourth Quarter 1991, at Beacon Service Station <br /> No. 492, 470 North \lain Street. Manteca, California. <br /> Mr. Earnest: <br /> This report presents the results of the fourth quarter 1991 groundwater sampling that <br /> RESNA Industries (RESNA, formerly Applied GeoSystems) conducted at the request of <br /> +.:. Ultramar Inc. at the subject site (see the Site Vicinity Map. Plate 1). The purpose of this y: <br /> sampling program is to monitor the concentrations of hydrocarbons in ground water at the 1. <br /> site. Work included measuring depths to water, sampling ground water for subjective and <br /> laboratory analyses of hydrocarbons, and evaluating the ground-+vater gradient beneath the <br /> site. The locations of the monitoring wells are shown on the Generalized Site Plan, Plate <br /> 2. <br /> Present Ground-11'ater Sampling <br /> On December 13, 1991, a technician from RESNA conducted the fourth quarter 1991 <br /> monitoring event at the site following methods summarized in an attachment to this letter <br /> report. Water Eerels were measured in the nsunitorutg +ve!]s (sae Table 1). <br /> We collected gratundwater samples from each rttorn71oring well and examined the samples <br /> for floating product, sheen, and other subjective evidence of hydrocarbons. No subjective <br /> evidence of hydrocarbons was observed in any of the monitoring wells (see Table 2). The <br /> <„; technician then collected groundwater samples from each monitoring well for laboratory <br /> analyses. Nater pinged from the wells was placed in 55-gallon drums approved for this use <br /> by the Department of Transportation and stored temporarily at the site pending removal by <br /> Ultramar Inc. <br /> i r 1213kcar <br /> 4,,, 8611)2-b <br /> e� <br />