SITE INFORMATION AND CORRESPONDENCE 1988 - 2001

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1 + Mr. Michael Infurna December 17, 1993 Page 2 of this first phase of investigation indicated high concentrations of fuel existed in the soil in the area of the product lines, which had reportedly leaked in the past. The first phase of the investigation identified the lateral extent the hydrocarbons in the upper 50 feet of soil. However, hydrocarbons were noted to extend to a depth greater than 50 feet. (Reference: "Report of Site Assessment for Delta Truck Sales, 3535 Cherokee Road, San Joaquin County, Stockton, California"; dated June 14, 1990 prepared by ESE, Project No. 02-531- 001) In a second phase of investigation, conducted during September and October 1990 by ESE, one ground water monitoring well was installed downgradient from the fueling island. The purpose of this second phase was to determine if the ground water had been impacted by. the fuel release. Ground water was found at a depth of 92 feet below ground surface. Soil containing hydrocarbons were noted to extend to a minimum of 85 feet in the well location. . Ground water samples collected from the well also indicated some hydrocarbon impact. (Reference:" Report of Ground Water Investigation around Fueling Island Area at Delta Truck Sales, 3535 Cherokee Road, San Joaquin County, Stockton, California'; dated October 31, 1990 prepared by ESE, project No. 6-90-5092). No further work was performed at the site until August 1992, when ESE was retained by Cecchini, Cecchini and Giovannoni to perform four quarters of monitoring on the fueling island well (UST-1). During the first quarter of monitoring, it was discovered that the well box had been broken by a heavy load (likely a truck) and never reported by the operator. The upper portion of the well was damaged and fuel and wash water from the fueling island were likely entering the well. The well box was repaired and monitoring revealed that floating product now existed on the water table. ESE contends that the dramatic increase in hydrocarbons in the ground water at this well is likely due to the broken well box which allowed surface runoff to access the well. Quarterly monitoring was performed on the well in September 1992 and December 1992. During both of these monitoring events, the well was bailed of fluids until no free product existed and then sampled. High concentrations of fuel were reported in the ground water on both occasions. (References: "September 1992 quarterly monitoring report for 3535 Cherokee Road, Stockton, California'; dated October 20, 1992 prepared by ESE. The December 1992 quarterly monitoring report for 3535 Cherokee Road, Stockton, California'; dated December 17, 1993). Quarterly monitoring was performed at the site for the second, third and fourth quarters of 1993. During the third quarter of 1993, interim remediation was performed at the site by the owners consisting of pumping well UST-1. Because of financial constraints, the work was performed by the owners personally. Based on a comparison of second quarter to third quarter analytical results for well UST-1, it appears that a significant reduction in petroleum hydrocarbons occurred due to the interim remediation efforts.