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1.0 SUMMARY <br /> Murray & Associates was retained by James M Langston, owner of Langston's Market in <br /> ' Lathrop, California to assess specific environmental concerns associated with the leakage <br /> g <br /> of gasoline from one of three 47000 gallon underground storage tank The site is located <br /> ' at 15615 Seventh Street in Section 26, Township 1 South, Range 6 East, in central San <br /> Joaquin County, approximately 2 miles east of the San Joaquin River (Figure 1) The <br /> property has been owned by the Langston family since 1960 Figure 2 is a plot plan of the <br /> facility which shows the location of the market, former pump island, and the three former <br /> 4,000 underground gasoline storage tanks The three tanks were excavated and removed <br /> by SEMCO, a UST contractor in April 1991 <br /> Ar <br /> p eliminary subsurface investigation and subsequent Environmental Investigation Report <br /> was completed by Murray & Associates in April, 1992 Soil gas samples collected from <br /> seven exploratory soil borings drilled during that investigation identified the presence of <br /> aromatic hydrocarbon compounds in both the soil and groundwater in excess of their <br /> maximum contaminant Ievels (MCL) This initial subsurface investigation was also able to <br /> ' qualitatively define both the lateral and vertical extent of the near surface soil and <br /> groundwater contamination, as it appeared in April, 1992 <br /> 1 In response to San Joaquin County and Regional Water Quality Control Board (RWQCB) <br /> requirements and recommendations for evaluation and investigation of underground tank <br /> site, Murray & Associates initiated this Preliminary Problem Assessment (PAR) <br /> Investigation This study included the installation, development and sampling of four <br />' groundwater monitoring wells The chemical analysis of water samples collected from these <br /> four monitoring wells confirmed and quantified the presence of gasoline in both the soil <br />' and the groundwater Benzene, toluene, ethylbenzene and total xylenes (BTEX) levels in <br /> excess of their respective MCLS, were found to be present in two of the three groundwater <br /> monitoring wells installed during this study <br /> 1 1 <br />