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i 4 _ "GROUNDWATER ViVIESTIG TION WORK PLAN - . .Di Salvo Tru g 4444 Lathrop mad IkLathrop, Calif rnia. San Joaquin County _ Prepared by _ - 3CONDOR )EARTH TECHNOLOGIES,INC.V x September 27, 7194 i r 1.0 MRODUCTION This work-plan describes the work to be conduct d by Condor EarthTechnologies, Inc., =- (Condor) during a groundwater investigation at the Di Salvo Trucking facility located at 1444 Lathrop _ Road in Lathrop, California as shown in Figure i, Appe dix A: The purpose of the work is to investigate the lateral extent of potential groundwater-car tamination at the site. This work plan includes a brief discussion of the site background, descriptions of the field work and laboratory - _ y analyses, and a site-specific health and safety plan. Theworkplan was prepared by Condor.at the request of Mr. Keith Taliia of Oil Equipment Service (O S),—acting agent for the Di Salvo Trucking facility in.Lathrop, California. 2.0 SITE BACKGROUIV'D Seven LTSTs were removed from the site.by,OE_ un:,August_1.1,_l.9EJ3. The contents of the tanks were diesel, motor oil, and waste-oil.: The former: ocations of the tanks are shown in Figure 2, Appendix A. Condor personnel were on site during the fank removal to make field observations and collect soil samples., Lab�cm��ryis,_detected:$O mg kg diesel—and-3-5-0 zng/lcg motor,oil in the e soil sample_collected beneath-the-east end-of TK4.av a-depth of•1:3.5.-feet below ground._surface._Grey petroleum staining was noted.on.-the east sidewall-at the ill,ends of TK3,.TK4,.and-TK5.to_a depthof7 approximately_$few On May 5, 1994; OES over-excavated the east si ewall near the former location of TK4 t� - eastward approximately 4 feet. The floor of the excavation-Was extended from the original tank excavation depth of approximately.13.5 feet to a final excavation depth of approximately 15.5 feet. 7. x � t• CONDOR