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Harding Lawson associates <br /> BACKGROUND <br /> The site is in a flat-lying area in the eastern part of <br /> Stockton (Plate 1) . The Cozad Trailer facility consists of an <br /> office building, with rows of workshop space for fabrication of <br /> lowboys. An on-site domestic water well produces drinking water <br /> for facility employees. The facility once had three underground <br /> storage tanks (USTs) in the central portion of the site, a 1,000- <br /> gallon gasoline tank and 5,000- and 10,000-gallon diesel tanks, <br /> all of which were removed in 1989. We understand that no other <br /> USTs are located on site and that only small quantities of other <br /> petroleum products are used by Cozad Trailers. The latter are <br /> stored in 55-gallon drums. Waste generated from the use of these <br /> chemicals is apparently kept on site for a very short time before <br /> �s <br /> it is hauled away. <br /> _ When the 1,000-gallon gasoline tank was removed in April <br /> 1989, a soil sample taken at the north end.of the tank was found <br /> �-� to have 200 parts per million (Ppm) of total petroleum <br /> 1 hydrocarbons (TPH) as gasoline. The excavation in the area of <br /> the gasoline tank was deepened by approximately one foot, and <br /> subsequent sampling and analyses performed; results apparently <br /> showed that the TPH as gasoline concentrations were reduced to <br /> 124 ppm. In June 1989, the 5,000- and 10,000-gallon diesel tanks <br /> were removed; no detectable TPH was found in samples from that <br /> area. This work was performed by Covenant Environmental <br /> Consulting and was documented in their report dated February 8, <br /> 1990. <br /> z <br /> 2 <br />