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PUBLIC HEALTH SERVICtS pP��IN <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M-D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 f <br /> RAYMOND GREER <br /> RAYMOND GREER CONSTRUCTION JUN 14 1999 <br /> 1111 1" ST <br /> ESCALON CA 95320 <br /> Re: RAYMOND GREER CONSTRUCTION Site Code: 2021 <br /> 15634 STEINEGUL RD <br /> ESCALON CA 95320 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> received and reviewed Soil Pr Groundwater Investigation Interim Report dated May 18, 1999 <br /> prepared by BSK&Associates (BSK). PHS/EHD has the following comments: <br /> • Analytical results of the water sample collected from Monitoring Well N2 (MW-2) on <br /> February 5, 1999 were 27,000 parts per billion (ppb) of Total Petroleum Hydrocarbon as <br /> gasoline (TPH-g), and 4,800 ppb of Benzene, 3,200 ppb of Toluene, 370 ppb of Ethyl- <br /> benzene, and 2,000 ppb of Xylenes (BTEX collectively). The BTEX concentrations are <br /> above the California Primary Maximum Contaminant Level (MCL) for public drinking <br /> water of 1 ppb, 1000 ppb, 680 ppb, and 1,750 ppb for BTEX, respectively. Analytical <br /> results of the water sample collected from MW-1 on February 5, 1999 were 1,800 ppb <br /> TPH-g, and 240 ppb, 20 ppb, 0.83 ppb, and 12 ppb of BTEX, respectively. A domestic <br /> drinking water well is located approximately 20 feet from MW-1 and approximately 70 <br /> feet from MW-2. Analytical results of the domestic well water sample taken from the tap <br /> at the base of the pump were non-detect at detection limits of 50 ppb of TPH-g and 0.3 <br /> ppb of BTEX. Due to the close proximity of the domestic well to the former UST area <br /> and the high concentrations of contaminants in the groundwater from MW-1 and MW-2, <br /> PHS/EHD recommends a water sample be collected from the domestic well for laboratory <br /> analyses at every quarterly sampling event. <br /> • Methyl tert-butyl Ether(MTBE) was not detected using EPA Method 8260 at above 5 ppb <br /> in the monitoring well water samples collected on January 8, 1999. The report stated that <br /> the domestic well and the monitoring wells were resampled on February 5, 1999 due to <br /> expiration of the holding time prior to BTEX analyses. Water samples collected on <br /> February 5, 1999 were analyzed using EPA Method 8015/8020 Modified. Analytical result <br /> of the water sample from MW-1 was 200 ppb of MTBE, from MW-2 was 890 ppb of <br /> MTBE, and MW-4 was 300 ppb of MTBE. Additional sampling and analysis is required to <br /> determine if these results were false positive anomalies due to the use of Method 8015/8020 <br /> Modified. Method 8260 should be used to analyze for MTBE and other oxygenates in all <br /> future sampling analyses. <br /> A Division of San Joaquin Countv Health Care Services <br />