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January 7, 1994 The City of Tracy 520 Tracy Blvd. Tracy, CA 95376 Atm: Mr. Paul Verma Re: Cage n' Play, 68 E. 11th Street, Tracy, CA Tank Removal Report for WES Job 4039-T Dear Mr. Verma, y Wright Environmental Services, Inc. Wright Environmental Services, Inc. (Wright) is pleased to provide you with this summary report of activities associated with the recent excavation and removal of two underground storage tanks (UST) from the above referenced site. Tank 1, last contained gasoline and had a capacity of 280 gallons. Tank 2 last contained waste oil and was 650 gallons in capacity. Drawing 1 identifies the location of the tanks and references a cross street in the vicinity. Permits Wright submitted 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 review process was expedited by Mr. Bill Snavely of PHS-EHD, permits were approved on October 22, 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 liquids were found in the tanks. Tank 1 contained water with a petroleum sheen. Tank 2 contained waste oil and a small amount of gasoline which was trapped in one of the three vertical risers connected to the tank. Both tanks were pumped free of residual liquids and 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 October 21, 1993 Hazardous Waste Manifest is enclosed in Appendix B. The tanks were excavated on October 22, 1993, soil was stockpiled on site between plastic. Obvious signs of petroleum hydrocarbons were observed in the soil surrounding each tank. There were mild gasoline odors from the soil around the fill pipe end of Tank 1 and oil stains around the fill pipe of Tank 2. After excavation work was complete a scaled drawing was made of the site. Drawing 2 identifies the specific location of the tanks (as they were found) and other pertinent site information. The site was then secured with 6 ft. chain-link fencing around the excavation perimeter. Prior to the removal of the tanks, they were purged with Carbon Dioxide (dry ice) at a rate of 15 pounds per 500 gallons of volume. The tanks were removed from the site on October 23, 1993 and transported to Triangle of Sacramento for proper recycling/disposal as documented by the underground storage tank disposition tracking record enclosed in Appendix C. Sample Collection and Analysis After removing the tanks on October 23, 1993, some additional excavation of soil below the tanks was conducted under the observation of PHS-EHD, after this minor over -excavation, soil samples were collected. The sample location, identification number, depth below top of sidewalk surface and collection time were documented on each sample and a proper chain of custody. The samples were immediately capped and placed in a chilled ice chest for transportation to Sparger `. Technology, Inc. of Sacramento, a State certified analytical laboratory. 1961 Hill View Way • Tracy, California 95376 Telephone (209) 833-0758 • Fax (209) 832-5152