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Cecchuu, Cecchuu, and Gun winom, Fue4ng Island <br /> 1.0 Entrroductionn <br /> The following report documents Second Quarter 1996 ground water monitoring activities <br /> for the fueling island area at 3535 East Cherokee Road, Stockton, California (Figure 1 - <br /> Vicinity Map) This work is being done in accordance with ESE Protocol, the guidelines <br /> of the San Joaquin County Health Division (SJCEHD) and the Central Valley Regional <br /> Water Quality Control Board (CVRWQCB). During the Second Quarter, a monitoring <br /> well designated UST-5 and a soil-vapor test well designated VP-1 were installed in a <br /> nested well near monitoring well UST-1 This work was performed to provide <br /> information for characterization of this site as a low risk ground water site. <br /> 1.1 Background <br /> In October 1992 ESE implemented a quarterly monitoring program that included the <br /> measurement of ground water elevation and collection of ground water samples from well <br /> UST-1 Beginning July 1, 1993 the monitoring program also included water level <br /> measurements in three additional ground water monitoring wells (SI-1, SI-2, and SI-3) <br /> located in the northern portion of the site and two water supply wells, "large" well and <br /> "small" well (see Figure 2 - Site Map) In an effort to ascertain the size of the potential <br /> ahydrocarbon plume in the area of UST-1, three new monitoring wells were mstalled at <br /> the site on April 4, 1995 (ESE, 1995b) Soils tested from these wells were reported to <br /> be non-detect in Total Petroleum Hydrocarbons as gasoline (TPH-G) and diesel (TPH-D), <br /> and ground water was reported to contain low levels of hydrocarbons from UST-1 and <br /> UST4 Concentrations of TPH-D in UST-1 decreased to approximately 1GO micro- <br /> grams per liter (jig/1) in the Second and Third Quarters of 1995 (ESE, 1995b; 1995c). <br /> However, rising ground water levels above the screen interval of UST-1 prompted the <br /> SJCEHD, in a letter dated February 6, 1996, to request installation of a shallow <br /> monitoring well near the location of UST-1. A soil-vapor test well designated VP-1 was <br /> also installed in preparation of soil vapor feasibility testing The current work descnbed <br /> below provides the basis for identifying this site as a low risk ground water site <br /> F 169254WUQM%RPT 1 Environmental Scamce do Englneenng, Inc <br />