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copy GROUND ZERO ANALYSIS, INC. 1714 Main street Escalon, California 95320-1927 Telephone: (209) 838-9888 Facsimile: (209) 838-9883 October 2, 2001 W. Mrke 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 l la' Street, Tracy, California Dear Mr. Souza: This correspondence summarizes the site activities associated with the removal of a fourth underground storage tank (UST) from the subject site (Figure 1). On September 14, 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 7,500 gallon UST (#39-515601) under permit issued by PHS/EHD by Jim Thorpe Oil, Inc (Thorpe). The previous contents of the UST are unknown, and according to Thorpe, no product was present in the tank upon initial examination. Subsequently, the UST was rinsed and inerted with dry ice and removed. The UST is in poor condition. Surface rust and numerous holes ranging from approximately Vs inch to at least 3 1/Z inches in diameter were noted. Evidence of petroleum hydrocarbon contamination was present in the bottom of the excavation in the form of soil discoloration and a slight diesel/gasoline odor. Photo ionization (PID) measurements of samples collected from the eastern and western floors of the tank pit ranged from 596 parts per million (ppm) to 110 ppm, respectively. No soil discoloration was apparent along the sidewalls of the excavation. A soil sample was collected beneath each end of the UST, placed into an ice chest cooled to a temperature of approximately 4°C, and transported under chain of custody to Argon Laboratory (FLAP #2359) for analysis. Groundwater was not initially present in the excavation, but was observed percolating into voids created during sample collection. Groundwater sampling was not required by PHS/EHD and none were collected. Soil sample locations are shown on Figure 2. Field notes are summarized in Attachment A. Laboratory anallyses consisted of total petroleum hydrocarbons as gasoline (TPHg) and total petroleum hydrocarbons as diesel (TPHd) by EPA method 8015 modified; benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA method 8020, oxygenated gasoline additives by EPA method 8260, and total lead by EPA method 6010. Analytical results are summarized in Table 1. G:\Dam\GROUNDZE\THORPE\So. \Tank pull c 0.da