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San Joaquin Motor Pool Facility May 11, 1999 Site Assessment Report . • Disposal of Solid/Liquid Waste, ' • Laboratory Analyses of Soil and Groundwater Samples, and 0 Data Evaluation and Report Preparation 6.0 TECHNICAL APPROACH For purposes of identification, the above referenced project was separated into four (4) areas of concern Area 1 represents Tank No 3, a gasoline underground storage tank (UST) removed in 1995 Area 2 represents the replacement of UST's No 1 and No 2 that occurred in November 1998 Area 3 represents UST's No 6 and No 7, which were removed prior to 1979, and existing UST No 8 (1,000 gallon) Area 4 represents existing UST No 4 (1,000 gallon waste oil) A Site Plan showing the above areas is presented to Figure 2 Prior to drilling and UST removal/abandonment activities, a Health and Safety Plan was ' prepared (Appendix A) and San Joaquin County Public Health Services and Underground Service Alert (USA) were notified and a well/pump permit was obtained from the San Joaquin County Public Health Services, Environmental Health Division A copy of the permit is presented in Appendix B The work described was conducted by a TEM geologist, trained and supervised by a California ' Registered Geologist 7.0 UST REMOVAL ACTIVITIES 7.1 UST Removal ' On March 16, 1999, following the break up and removal of the concrete slab (Area 4), a backhoe was used to remove soil to expose waste oil UST No 4 The excavated soil was covered with plastic and stockpiled on-SITE The interiors of both UST No 4 and No 8 were then pressure washed and triple rinsed The rinsate was removed from the tanks and transported from the SITE by vacuum truck When the lower explosive limit (LEL) inside each of the UST's was measured at zero, as registered on a explosimeter, the UST's were certified as clean by Letitia Briggs with the SJCPHS and permission was granted to remove UST No 4 During the removal of UST No 4, the UST appeared to be in poor condition, but there was no visible evidence of leakage 1 Approximately 50 pounds of dry ice was crushed and inserted inside UST No 4 The UST was pp Y then loaded onto flat-bed trailer, strapped down and transported to West Coast Equipment in Turlock, California for disposal Pressure washing, rinsate transportation and disposal were provided by Nor Cal Oil, Inc of Denair, California Copies of the rinsate manifest and UST disposal documentation are presented in Appendix C 1 3