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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> _•• ��„� Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Third Floor Carl Borgman,R.E.H.S. <br /> Director 304 East Weber Avenue, <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,Douglas W.Wilson, <br /> S.,R.D.I. <br /> R.E.H.S. <br /> • C4��FOR��P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S, <br /> KHALED ANBER APR 1 5 2004 <br /> P O BOX 2121 <br /> MILL VALLEY CA 94942 <br /> RE: Blue Star SITE CODE 1350 <br /> 4040 Main Street <br /> Stockton, California 95205 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Revised Monitoring <br /> Well Installation Work Plan, dated March 19, 2004, and submitted on your behalf by Advanced <br /> GeoEnvironmental, Inc. (AGE). In this work plan, AGE proposed the following: <br /> • Advancement of one soil boring to a total depth of approximately 70 feet below surface <br /> grade (bsg) and completed as a groundwater monitoring well, screened from <br /> approximately 50 to 70 feet bsg. Soil samples will be collected at five-foot intervals. This <br /> first boring will be located north of the former dispenser island area. Based on analytical <br /> results for groundwater samples collected from this monitoring well, two additional <br /> borings may be advanced and completed as groundwater monitoring wells, one located <br /> near the former underground storage tanks and one located southwest of-the former <br /> dispenser area. <br /> • Groundwater and selected soil samples will be analyzed for the following: total petroleum <br /> hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), <br /> benzene, toluene, ethyl benzene, total xylenes (BTEX), methyl tertiary-butyl ether <br /> (MTBE), tertiary-butyl alcohol (TBA), di-isopropyl ether(DIPE), ethyl tertiary-butyl ether <br /> (ETBE), tertiary amyl methyl ether (TAME), methanol, ethanol, 1,2-dichloroethane <br /> (1,2-DCA), and 1,2-dibromoethane(EDB). <br /> EHD does not agree that the initial monitoring well should be located north of the former dispinser <br /> where there is currently no data. Historical data collected during the removal of the underground <br /> storage tanks (UST) in March 2002 and advancement of three borings in April 2003 indicate that <br /> soil and groundwater are impacted near the former USTs and further assessment is needed. EHD <br /> recommends installing all three proposed monitoring wells to assess the soil and groundwater <br /> contamination at this site. At least one boring should be continuously cored to characterize the soil <br /> lithology. <br /> Laboratory reports must include the following for all analyses: method blank results for every <br /> analyte reported; surrogate recoveries for US Environmental Protection Agency (EPA) SW-846 <br /> methods 8015B, 8021, and 8260B; recoveries for laboratory control samples (LCS), and matrix <br /> spikes (MS) if analyzed using site samples; and quality control limits for the surrogates, LCS, MS, <br /> and relative percent differences. Please ensure the reporting limits for 1,2-DCA and EDB are at <br /> least 0.5 micrograms per liter(gg/L)in groundwater. <br />