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I Project No. E6576.001 �oundwater Sampling/835 West Clover Rol) 14 December 1995 I, U Sampling: L� MW-2, MW-3, and MW-4 were sampled on 8/16/95. MW-1 was sampled on 10/27/95 and 12/7/95. All samples were obtained in the company of Mr. Steve Sasson of San Joaquin County Environmental Health Division. Prior to each sampling event, water levels were measured. The water levels in MW-1, MW-2, and MW-3, dropped from the readings on 10/21/94 while the water level in MW-4 rose (See Appendix A for details). Since the first sampling event occurred on two different days, the groundwater gradient was calculated from readings in MW-2, MW-3, and MW-4, only (see Figure 1). The second sampling event indicated that the water levels in all wells rose from the readings on 10/5/95 and 10/27/95. Samples were collected following the purging of the wells and after pH, conductivity, and temperature has stabilized. At least three casing volumes were removed during purging. r The samples were accompanied from the field to the laboratory by a chain-of-custody and V request analysis form for diesel, benzene, toluene, ethylbenzene, and xylenes. Groundwater samples for analysis of benzene, toluene, ethylbenzene, and total xylene (BTEX) were collected in 40-m1 glass volatile organic analysis ("VOC") vials with Teflon septums as specified by the RWQCB and EPA. Water samples for diesel analysis were collected in 1-liter amber glass jars. All sample containers were new. Remediation of Contaminated Soil: On 27 October 1995, all 200+ cubic yards of contaminated soil was transferred by a certified hauler (Manley & Sons Trucking, Inc.) to Forward Inc. Landfill in Manteca, California, a licensed Class II landfill. The excavated pit was backfilled above the groundwater level with "clean" import material from Tracy Teichert Quarry and approximately 100 cubic yards of"clean" native soil was used to bring the remaining excavation to existing ground level. TERRASEARCH, inc. Page 3