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z Opp GROUND ZERO ANALYSIS, INC. 1714 Maio Street Escalon, California 95320-1927 Telephone: (209) 838-9888 Facsimile: (209) 838-9883 June 29, 2001 Mr. Mike Souza Souza Realty and Development 105 E 10" Street Tracy, CA 95376 Subject: Summary of Site Activities Related to Underground Storage Tank Removal 612 West 11'" Street, Tracy, California (Figure 1). Dear Mr. Souza: This correspondence summarizes the site activities associated with the removal of one approximately 7,800 gallon underground storage tank (UST) on June 11. 2001 and one 1,000 -gallon UST on June 15, 2001. The previous contents of the USTs are unknown. On June 11, 2001, Mr. Sean Garvey of Ground Zero, Ms. Allison Youngblood of San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD), and Mr. Dave Barboza of Tracy Fire Department arrived on site to observe the removal of one 7,800 gallon unknown fuel UST by Jim Thorpe Oil, Inc (Thorpe). The tank was removed under permit issued by PHS/EHD and was identified as number 39-515589. According to Thorpe, no product was present in the tank upon initial examination. Prior to removal, the UST was rinsed and inerted with dry ice. Upon completion of the inerting procedure, the tank was removed. During removal an orphan UST was discovered, however, due to the inability to obtain the necessary supplies and coordinate for waste removal and transportation within a timely manner, it was decided to uncover the second tank but remove it at a later date. Numerous holes ranging from approximately '/a inch to 4 inches in diameter were present in Tank 1 along the tank bottom. Surface rust was present on the remainder of the tank. Strong petroleum hydrocarbon odors and soil discoloration were noted in the soil visible along the floor of the excavation. Water was also present in the excavation. After discussion with PHS/EHD it was decided to sample the groundwater subsequent to the removal of the second tank. On June 15, 2001, the 1,000 -gallon orphan UST identified as 39-515591 was removed under permit issued by PHS/EHD. No product was present. Prior to removal, the UST was rinsed and inerted with dry ice. Upon completion of the inerting procedure the tank was removed and examined for compromises of integrity. Numerous holes up to 4 inches in diameter were found along the tank bottom. Strong petroleum hydrocarbon odors and discoloration were noted in soil visible along the floor of the excavation. G:\Dam\OROUNDZE\IHORPE\Soya\Tank pull cvr.dm