SITE INFORMATION AND CORRESPONDENCE_CASE 1

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- - - E1zvironil-iental Science & �j Engineering,Inc. April 15, 1992 Project No. 6-90-5030 Mr. Harlin Knoll San Joaquin County Public Health Services Environmental Health Division P.O. Box 2009 Stockton, California, 95201 SUBJECT: Review of Analytical Findings from AT&T Lodi Facility, 110 West Turner Road, Lodi, San Joaquin County, California Dear Mr. Knoll: Environmental Science & Engineering, Inc. (ESE) requests that San Joaquin County Public Health Services Environmental Health Division (County) reconsider its decision not to grant closure at the subject facility based on a further review of analytical findings. On May 14, 1987 Kleinfelder overexcavated the former underground storage tank (UST) area. The soil from the pit sidewalls was sampled and analyzed. A cross-section of sample locations is shown on Worksite Plan (Figure 1) and Cross-Section A - A' (Figure 2). Sample SS-07 collected at a depth of 18 feet, had a Total Petroleum Hydrocarbons-diesel (TPH-d) concentration of 21 milligrams per Kilogram (mg/Kg). All other excavation samples had nondetectable concentrations of TPH-d at a Method Reporting Limit (MRL) of 10 mg/Kg. All excavation samples were nondetectable for Benzene, Toluene, Ethylbenzene, and total Xylenes (BTEX) at MRL's of 0.1 mg/Kg for Benzene and 0.2 mg/kg for the other three components. In late October and early November, 1990 ESE drilled five borings (three were converted to monitoring wells) within and near the former excavation (Figure 1). For the two borings located within the former excavation (B-2X and Y) the only soil observed to be impacted with diesel was found at a depth of 14 to 15 feet in boring B-2Y (TPH-d; 110 mg/Kg). Soil samples analyzed from all other borings had TPH-d concentrations below four mg/Kg. All soil samples analyzed had nondetectable concentrations of BTEX with a MRL of five micrograms per Kilogram (ug/Kg). 411th)"�V11��n AN f'nin, ultr C0ncnrd,CA 94- 20 Phone 451111 4)S7-4051