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_ ruAM <br /> Working to Restore Nature <br /> 3164 Cold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Phone (916) 852-6690 <br /> Fax (916) 852_6688 <br /> December 16, 1993 <br /> Mr. James Escobar <br /> Department of Public Works <br /> City Hall <br /> Stockton, California 95202-1997 <br /> Subject. Status Report, Environmental Investigation, Fourth Quarter 1993 <br /> Fire Engine Company No 2 <br /> 110 West Sonora Street, Stockton, California <br /> Mr Escobar. <br /> This letter report summarizes the results of the environmental investigation conducted <br /> during the four quarter 1993 by RESNA Industries Inc (RESNA) at the subject site (shown <br /> on Plate 1) The work was conducted at the request of the City of Stockton, Department <br /> of Public Works (City of Stockton) and included a supplemental investigation and <br /> groundwater monitoring The supplemental investigation consisted of drilling one <br /> exploratory soil boring, installing one offsite groundwater monitoring well and two onsite <br /> vapor extraction wells, and collecting soil samples Groundwater monitoring consists of <br /> measuring depths to groundwater, collecting groundwater samples from the wells for <br /> subjective and laboratory analyses, and evaluating the groundwater gradient and direction <br /> of groundwater flow beneath the site <br /> BACKGROUND <br /> In April 1987, a 1,000-gallon unleaded gasoline tank was removed and residual hydrocarbons <br /> were detected in the soil remaining under the former tank In April 1992, a 250-gallon <br /> waste-oil tank was removed The locations of the former and existing tanks are shown on <br /> Plate 2 In 1988, The City of Stockton contracted RESNA to conduct a subsurface <br /> investigation to assess the extent of residual hydrocarbons in soil The investigation <br /> performed between 1988 and 1992 included drilling thirteen soil borings, installing four <br /> groundwater monitoring wells, three vapor extraction wells, one piezometer, and one <br /> 1112jesc/38009-4 <br />