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lkwo Wright January 10, 1994 Environmental Services, Inc. Tracy Joint Union High School District 311 E. 11th Street. Tracy, CA 95376 Attn: Ms. Anne Bell Re: Tracy High School Bus Maintenance Facility Tank Removal Report (WES Project 4028-T) Dear Ms. Belle Wright Environmental Services, hic. (Wright) is pleased to provide Tracy Joint Union High School District (THS) with this summary report of activities associated with the recent excavation and removal of a 1000 gallon diesel tank from the above referenced site. Permits Wright completed underground storage tank closure permit application forms provided by San Joaquin County, Public Health Services-Environmental Health Division (PHS-EHD) prior to beginning excavation work. The closure permit application was reviewed by Mr. Bill Snavely of PHS-EHD, permits were approved on December 13, 1993. A copy of the approved permit is enclosed in Appendix A. The City of Tracy waived excavation permit requirements. Tank Removal, Disposal and Excavation Prior to excavation work, residual diesel fuel found in the tank was pumped and the tank was rinsed with water. The residual liquid and the rinsate were recycled by Petroleum Recycling Corp. of Patterson, Ca., as non-RCRA Hazardous Waste. A copy of the December 20, 1993 Hazardous Waste Manifest is enclosed in Appendix B. During demolition and removal of the concrete pavement, petroleum vapors were noted as being present in the soil adjacent to the dispenser island and at the fill end of the tank. The soil excavated from the area around the tank and dispenser area was stockpiled at the site and placed between plastic. Prior to being removed, the tank was purged with Carbon Dioxide(dry ice) at a rate of 15 lbs per 500 gallons of volume. The tank was removed from the site and shipped to Triangle of Sacramento on December 21, 1993 for recycling/disposal as documented by the underground storage tank disposition tracking record enclosed in Appendix C. Sample Collection and Analysis Sample collection and analysis from below the diesel UST and the dispenser island was not required by Ms. Linda Turkatte of PHS-EHD LOB Unit due to the obvious presence of diesel in the soil. Also considering the site had a documented leak from the previously removed gasoline tank, Ms. Turkatte advised THS that remediation work associated with both of the releases from the previously removed gasoline UST and the recently removed diesel UST should begin forthwith. Backfill of Excavation On December 31, 1993 the excavation was lined with 10 mil plastic sheeting and backfilled with to a level of 1.5 ft of the concrete surface with 3/4 in crushed rock. The remaining 1.5 ft was filled with 3/4 in Class R aggregate base and compacted in 6 y in lifts followed by a 1.5 in asphalt patch. Copies of the load tickets for the fill material is enclosed in Appendix D. 1961 Hill View Way • Tracy, California 95376 Telephone (209) 833-0758 • Fax(209) 832-5152