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CENTRAL VALLEYOEGIONAL WATER QUALIT�'ONTROL BOARD <br /> INSPECTION REPORT <br /> DISCHARGER: Delta Truck Sales 31 May 1989 <br /> LOCATION & COUNTY: Stockton, San Joaquin County <br /> CONTACT(S) : Ken Smith, President; Mary Varela, Environmental Specialist <br /> INSPECTION DATE: 27 April 1989 <br /> INSPECTED BY: Robert L. Niblack <br /> ACCOMPANIED BY: Ken Smith, Mary Varela <br /> OBSERVATIONS <br /> The purpose of this inspection was to sample a water supply well several feet to the west <br /> of a surface impoundment subject to regulation by the Toxic Pits Cleanup Act. According <br /> to Mary Varela this well was probably constructed about 1967. The total well depth is 178 <br /> feet, and the screened interval is unknown. <br /> Water samples were collected for analysis by EPA Methods 601, 602, and 625, for analyses <br /> for major cations and anions, pH, EC, total dissolved solids, alkalinity, and CAM metals. <br /> A portable meter indicated pH of the well water was 7.0, and electrical conductivity was <br /> 460 umho/cm. <br /> Samples were taken from a sampling port between the well head and the pressure tank. <br /> Casing is 18 inches in diameter and a 4-1/2 inch (outside diameter) pipe is cemented into <br /> the top of the casing. <br /> Mary Varela observed sampling of the well . <br /> ANALYTICAL RESULTS <br /> Water samples were analyzed for organic constituents at Enseco Incorporated in West <br /> Sacramento. Results of the analyses for halogenated Volatile Organics (EPA Method 601) , <br /> Aromatic Volatile Organics (EPA Method 602) , and Semivolatile Organics (EPA Method 625) <br /> showed none of these constituents were present in the samples above the reporting limits. <br /> Water samples were analyzed for CAM metals by Central Coast Analytical Services in San Luis <br /> Obispo. Three metals were found in the samples above the reporting limit. Barium was <br /> present at a concentration of 130 ug/L, chromium was present at 9 ug/L, and vanadium was <br /> present at 30 ug/L. <br /> Water samples were analyzed for general minerals and other water quality parameters at <br /> Sierra Foothill Laboratory in Jackson. Those results are attached to this report along <br /> with the other laboratory reports. <br />