SITE INFORMATION AND CORRESPONDENCE

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� I PUBLIC H ALTH SERVIdS SAN JOAQUIN COUNTY ENVIRONMENTAL HEALTH DIVISION Karen Furst, M.D., M.P.H., Health Officer �. P 304 East Weber Avenue, Third Floor • Stockton, CA 95202 2091468-3420 SAIYED ALI MAY 2 9 2001 CALTRANS DISTRICT 10 P O BOX 2048 STOCKTON CA 95201 RE: Caltrans Lodi Maintenance Station SITE CODE: 1363 845 E. Pine Street Lodi CA 95240 San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the file for the above referenced site and has the following comments. Two 1000-gallon underground storage tanks were removed from the site on November 30, 1989. The tanks were sitting on top of a concrete slab, which prevented the collection of soil samples from beneath the tanks at the time of removal. Soil samples for analysis were collected from beneath the product lines on the following day, December 1, 1989. Soil samples for analysis were collected from beneath the concrete slab on May 2, 1990. A concentration of 92 milligrams per kilogram (mg/kg) total petroleum hydrocarbons (TPH) as kerosene was detected in one of the product line samples. Petroleum hydrocarbon contamination was not detected in the other product lime samples at concentrations above the detection limits. However, the detection limits used in the analyses were elevated above acceptable levels. Additionally, analytical results from the samples collected from beneath the concrete slab were positive for petroleum hydrocarbons at levels up to 1,500 mg/kg TPH as gasoline. In August 1995 a series of eight borings were advanced on site to collect soil samples for analysis. Groundwater was not encountered in any of the borings and therefore groundwater samples were not collected. Of the forty-six soil samples submitted for analysis, only three had minor detections of petroleum hydrocarbons (Site Investigation Report, September 15, 1995, Geocon Environmental Consultants Inc.): Soil boring SB- 1, advanced through the former tank pit, had 8.3 mg/kg TPH as motor oil in the 5.5 foot below surface grade (bsg) sample. Soil boring'SB-5, advanced in the former dispenser island area, had 240 mg/kg TPH as gasoline in the 11 foot bsg sample and 3 mg/kg TPH as motor oil in the 16 foot bsg sample. In their conclusions, Geocon recommended that the site should be closed. In correspondence dated September 21, 1995 Cal Trans concurred with the recommendation for closure. A formal closure report was not submitted to PHS/EHD. Furthermore, PHS/EHD staff reviewing the case at the time concluded that the petroleum hydrocarbon contamination remaining in the soil presented a potential threat to groundwater in the area and requested that a Corrective Action Plan (CAP) be submitted to PHS/EHD by January 15, 1996. A CAP was never submitted. A Division of San Joaquin County Health Care Services