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P-N <br />RESNA WATERWORK CORP. <br />INDUSTRIES <br />March 21, 1991 <br />Executive Summary <br />Subsurface Investigation <br />26056 Thornton Road <br />Thornton, CA <br />Site Code 1864 <br />-77r <br />APR 1 Tgl <br />ONNIENTAL HEALTH <br />PERMIT/SERVICES <br />HISTORY OF SITE <br />On September 6, 1989, three underground gasoline storage tanks <br />were removed from the project site. Soil samples were collected <br />beneath each tank and the associated piping and analyzed for <br />petroleum hydrocarbon constituents using appropriate EPA and DHS <br />methodologies. Soil samples collected from beneath two of the <br />tanks contained moderate to high levels of ethylbenzene and <br />xylenes (1.2 to 42 parts per million (ppm)) as well as TPHG (50- <br />830 ppm). <br />Under the direction of the San Joaquin County Public Health <br />Services, Environmental Health Division (SJCPHS), the property <br />owner has already conducted some subsurface investigative activi- <br />ties. The property owner is required to conduct further investi- <br />gation to evaluate site conditions and to determine appropriate <br />cleanup measures. Although conditions at this site are not <br />unusual, precautionary measures beyond those normally required <br />are being implemented due to the site proximity to a municipal <br />well (Thornton Municipal Well #2). <br />CURRENT WORK <br />The current scope of work involves soil borings and monitoring <br />well installation and a sampling plan to provide a complete <br />characterization of soil and groundwater contamination, including <br />the type, extent, migration, and fate of contaminants. <br />On November 1, 1990, three monitoring wells were installed at the <br />site to evaluate the impact of the petroleum product discharge on <br />the shallow groundwater beneath the site. Laboratory analysis <br />verified that some groundwater contamination exists at the site. <br />To fully define the extent of groundwater contamination, 2-3 <br />additional monitoring wells will be installed at the site. The <br />work plan for this additional investigative phase is currently <br />being reviewed by the SJCPHS. <br />1710 MAIN STREET • ESCALON, CA 95320 • (209) 838-3507 <br />2350-A WALSH AVENUE • SANTA CLARA, CA 95051 • (408) 496-1249