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EXECUTIVE SUMMARY <br />NNW <br />This is a report of Kleinfelder's observations of Hydro -Search's field <br />investigation at the Foothill Sanitary Landfill in San Joaquin County, <br />California (the site). <br />Foothill Sanitary Landfill, Inc. requested Kleinfelder to observe <br />Hydro -Search's field operations of April 27, April 28, April 29, and <br />May 6, 1988. Kleinfelder observed Hydro -Search's installation and <br />subsequent abandonment of three monitoring wells and one soil boring at <br />the site. <br />Water samples were collected from the onsite domestic well by Kleinfelder <br />on April 28 and May 6 as duplicates to the water samples collected by <br />Hydro -Search. Kleinfelder had the two sets of water samples analyzed for <br />halogenated volatile organics by EPA Method 601. Trans-1,2-dichloroethene <br />was detected at 0.6 ugfl in the water sample collected on April 28, 1988. <br />But in the water sample collected on May 6, 1988, trans-1,2-dichloroethene <br />was not detected. No other halogenated volatile organic compounds were <br />detected in the two sets of water samples. In addition, water samples <br />collected by Kleinfelder on April 28, 1988 were analyzed for total <br />dissolved solids, pH, and electroconductivity. These parameters appear to <br />be within drinking water standards. <br />Ten soil borings were drilled to a depth of three feet and scanned by <br />Hydro -Search with a HNu photoionization device. Readings from two borings <br />on the south side of the landfill and two borings near the maintenance <br />shed indicated hydrocarbons present at 0.2 to 1.6 parts per million by <br />volume (ppmv). These ten soil borings were also scanned with a <br />combustible gas indicator by Kleinfelder and Hydro -Search. No <br />(combustible) vapors were detected at the ten borings by either device. <br />104-88-683 iv <br />