SITE INFORMATION AND CORRESPONDENCE

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Mr. James Brathovde April 30, 1990 Page 2 10 feet, and 12 to 13 feet. A liquid sample was also obtained from a depth of 8 feet. The soil samples had total lead levels ranging from 9 to 1,200 mg/kg. Only the 1,200 mg/kg found in the sample from 8 feet at location S-5 exceeded the Total Threshold Limit Concentration (TIM) of 1,000 mg/kg established for lead. Soluble lead levels in the samples ranged from nondetectable (ND) to 14 mg/L, with four of the samples exceeding the STLC value of 5.0 mg/L. The liquid sample contained 0.067 mg/L soluble lead and had nondetectable levels of halogenated volatile organics as measured by EPA Method 601. Two additional soil samples were obtained in June 1989 by Mr. Robert Niblack of the CVRWQCB. One of these samples was taken from the northeast section of the excavation from a depth of approximately 6 feet and was described as to be stained with oil. The other sample was taken from the ground surface where it had dropped during excavation and was described as oily sludge. These samples were analyzed for total and soluble levels of the California Assessment Manual (CAM) 17 metals. The analytical results for the 6- foot soil sample showed metal concentrations exceeding the STLC or TTLC values. The results from the sludge sample indicated total and soluble levels of zinc to be 10,000 mg/kg and 300 mg/L, respectively. These levels exceed the zinc TTLC value of 5,000 mg/kg and the STLC value of 250 mg/L. No other metal was detected in the sample at levels greater than its TTLC or STLC. In April 1989, Mr. Niblack also took a ground-water sample from a surface valve of a 178- foot deep, 18-inch diameter water supply well on the site within several feet of the impoundment area. The ground-water level in this well is reported to be 67 feet. Construction details of the well, such as the screened interval, are unknown. The ground- water sample was analyzed for Halogenated Volatile Organics using EPA Method 601, Aromatic Volatile Organics using EPA Method 602, and Semivolatile Organics using EPA Method 625.—None of these constituents were detected at levels above reporting limits. The sample was also analyzed for CAM metals. Three metals were found in the sample above reporting limits: barium at 130 ug/L, chromium at 9 ug/L, and vanadium at 30 ug/L. Mr. Niblack concluded that these analytical results do not indicate that the water in this well has been adversely impacted by hazardous materials from the nearby surface impoundment. Kleinfelder submitted a work plan on August 30, 1989 to the CVRWQCB for the characterization of the stockpiled soil but the work was never accomplished. The stockpiled soil and open excavation of approximately 150 feet by 100 feet by 10 feet deep are still on site. ESE was retained by Delta Truck Sales in April 1990 to develop a work plan and implement activities to further characterize the site.