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BOO p"� GROUND ZERO ANALYSIS, INC. 1714 Main Street Fscalon, California 95320.1927 Telephone: (209) 838-9888 Facsimile: (209) 838-9883 September 6, 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 114' Street, Tracy, California Dear Mr. Souza: This correspondence summarizes the site activities associated with the removal of a third underground storage tank (UST) from the subject site (Figure 1) on August 27, 2001. Results of samples collected during removal of two USTs were submitted under separate cover. On August 27, 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 approximately 1,000 gallon unknown fuel UST by Tim Thorpe Oil, Inc (Thorpe). The tank was removed under permit issued by PHS/EHD and was identified as number 39-515600. According to Thorpe, no product was present in the tank upon it iial examination. The previous contents of the UST is unknown. The UST was rinsed and inerted with dry ice prior to removal. Numerous holes ranging from approximately '/4 inch to 4 inches in diameter were present along the tank bottom. Surface rust was present on the remainder of the tank. No soil discoloration was apparent along the sidewalls or floor of the excavation. A slight kerosene odor was noted, but it was unclear if the odor was in the soil or from rinsing activities. PID measurements were less than 1 parts per million. No water was present in the excavation. Soil and groundwater sample locations are shown on the site plan (Figure 2). Field notes are summarized in Attachment A. The samples were placed into an ice chest cooled to a temperature of approximately four degrees centigrade and transported under chain of custody to Argon Laboratory (FLAP 2359) for analysis. Analysis for each sample 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, gasoline oxygenates by EPA method 8260, and total lead by EPA method 6010. Analytical results are summarized in Table 1. Laboratory data sheets GADu \GROUNDZE\TNORPE\S*=\Tails pull cv,2.d.