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I <br /> November 1990 -z <br /> M8$1b8D <br /> • Preparation of this technical report describing the methods of <br /> investigation employed in the supplemental site assessment and <br /> the principal findings, conclusions, and recommendations. <br /> Geotet:hnical logs describing the earth materials encountered in the T <br /> drill holes and mon.itorin resented in <br /> g well are P Appendix A (Plates A-1.1 through <br /> A-1,4). Analyticsl results of the soil and ground water samples are presented <br /> in Appendix B - Laboratory Analytical. Results. Appendix C - Environmen.tal <br /> �1 Monitoring, Sampling, and Analytical Protocols, details the processes and <br /> protocols empleyed during the assessment. <br /> Appendix D - Field Memoranda and <br /> Documentation, contains all field notes including sample preservation documenta- <br /> tion. <br /> jBACKGROUND <br /> A 4,000•-gallon underground storage tank (UST) used to store diesel <br /> ? fuel was removed from the site, located at 5400 East Harney Lane, Lodi, <br /> r <br /> California, on March 1, 1989, by Jim Thorpe Oil Company, Inc, The UST removal � <br /> was observed and documented by SGD, Underound Stora a Tank Re ova Celor Snot � ; <br /> Lodi. ,Inc,,,, March 1989. <br /> The soils surroundingthe fill <br /> port and the southwestern corner of "! ' <br /> the UST were, visibly stained and smelled of diesel £ue1. .Field monitoring witht-' <br /> s <br /> a photoioni.zation detector (PID) also indicated elevated TPH concentrations. <br /> Soil samples collected after the UST was removed exhibited eth,lbenzene, total L1 ' <br /> f ; <br /> r xylene and TPH concentrations in excess of applicable regulatory action leve3s. k <br /> As a result of the soilcontamination, SGD was hired by Color Spot, Inc. , to <br /> verify the existence of soil contamination, delineate the lateral extent of <br /> contamination, and to evaluate adjacent domestic ground water wells for <br /> contaminants associated with diesel fuel. "' <br /> } <br /> SGD conducted a soil vapor survey August 15, 1989, under SJLHD permit <br /> ---- <br /> -- - 89.-Z857-and-documented b SGD, So F <br /> �3 Y Vapor 5tudv Coo Sof o-- "nc October <br /> i` 1989. Results of the survey indicated that the diesel fuel contamination within <br /> the shallow subsurface (depth of & feet below ground surface) did not appear to n+ <br /> a <br /> have migrated laterally a significant distance beyond the tank excavation. The <br /> 1 <br /> Ll <br />