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t # PUBLIC HEALTH SERVIC"W2, s U I <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION y.. F <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 fit oR <br /> 2091468-3420 <br /> FILE COP 'S <br /> -GEORGE TAKEMORI <br /> 'A TEICHERT AND SONS INC JUL 2 ? 1999 . <br /> ,P O BOX 15002 <br /> SACRAMENTO CA. 9.5 8 51 4 <br /> ,RE: A. Teichert and Sons Inc. Site Code: 1.555 <br /> 103 North E Street <br /> Stockton, CA <br /> ,San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) is the <br /> ;lead agency providing the oversight of the investigation and cleanup of releases From <br /> 'underground storage tanks (UST) within San Joaquin County. PHS/EHD has a contract with <br /> ,California State Water Resources Control Board to conduct an underground storage tank <br /> corrective action program. The above referenced site was placed in the PHS/EHD Local <br /> Oversight Program (LOP) in March 1989. <br /> ;In October 1989, two gasoline and one waste oif USTs were removed and gasoline contamination <br /> ,was discovered. An overexcavation work plan was implemented and soil was removed to 38 feet <br /> below ground surface (bgs). From 1987 to 1994 a soil and groundwater investigation was <br /> conducted. A "Problem Assessment and Final Remediation Plan" was then prepared by <br /> EMCON. Due to the remaining soil and groundwater contamination, soil vapor extraction (SVE) <br /> was performed from December 1994 until 1996. <br /> PHS/EHD has completed review of the April 30, 1999 "Groundwater Sampling, Analysis, and' , <br /> Closure Report" prepared by Pinnacle Environmental Solutions_ On March 16, 1999, nine on site <br /> monitoring wells (MWs) were sampled and groundwater was analyzed for TPH-gas, BTEX, and <br /> oxygenates. Dissolved petroleum hydrocarbon was detected in MW#13 and MW#14. Current <br /> TPH-gas concentrations range from 1,100 to 5,100 parts per billion (ppb) and Benzene <br /> concentrations range from below detection limits to 55 ppb. Two oxygenates were detected; <br /> MTBE at 4 ppb in MW#13 and DIPS at 7 ppb in MW#14. <br /> At the time MW#13 was installed in 1992, a petroleum sheen was noted in the groundwater at 85 <br /> feet bgs and the soil sample collected at 90 feet bgs had product odor. Historically, groundwater <br /> has been as deep as 100 feet bgs in this area. PHS/EHD directs you to perform a soil boring in <br /> this area to determine the full extent of contamination. The boring should be drilled to a minimum <br /> depth of 100 Feet bgs and continue until field observations and field screening indicates no <br /> contamination exists. Soil confirmation samples should be collected and analyzed for: TPH-gas, <br /> !BTEX, and oxygenates. The samples analyzed from the boring can also be used to evaluate the <br /> 'effectiveness of the SVE and be used to calculate the mass remaining beneath the water in the <br /> area of the UST release. <br /> 'On March 23, 1999, three additional USTs were removed and soil samples collected. Soil <br /> samples were analyzed for TPH-gas, TEPH-diesel, BTEX, and oxygenates. The tank bottom <br /> sample results, 16 feet bgs, were non-detect for contaminants and the dispenser sample results <br /> from DS-1 and DS-2 contained MTBE at concentrations of 23 ppm and 28 ppm, respectively. On <br /> April 22, 1999 the dispenser areas were overexcavated to 6 feet bgs and confirmation soil sample <br /> results were below detection limits for MTBE. <br /> A Division of San Joaquin County Health Care Services <br />