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f <br /> Working To Restore Nature <br /> 3164 Gold Camp Drive,Suite 200 <br /> Rancho Cordova,CA 95670 <br /> Phone (916)852-6690 <br /> FAX (916) 852-6688 <br /> April 22, 1993 <br /> Mr James Escobar <br /> Department of Public Works <br /> City Hall <br /> Stockton, California 95202-1997 <br /> Subject Status Report, Environmental Investigation, First Quarter 1993, Fire Engine <br /> Company No 2, 110 West Sonora Street, Stockton, California. <br /> Mr Escobar <br /> This letter report summarizes the results of the environmental investigation conducted <br /> �} during the first quarter 1993 by RESNA Industries (RESNA) at the subject site (shown on <br /> Plate 1) The work was conducted at the request of the City of Stockton Department of <br /> Public Works (City of Stockton) and included measuring depths to ground water, collecting <br /> ground-water samples from the wells for subjective and laboratory analyses, and evaluating <br /> the ground-water gradient and direction of ground-water 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 (formerly Applied Geosystems) <br /> to conduct a subsurface investigation to assess the extent of residual hydrocarbons in soil <br /> The investigation performed between 1988 and 1992 included drilling thirteen soil borings, <br /> installing four ground-water monitoring wells, three vapor-extraction wells, one piezometer, <br /> and one recovery well, collecting and analyzing soil and ground water samples for <br /> hydrocarbons, and performing a ground water pulse test and a soil vapor-extraction test <br /> (Applied GeoSystems, November 20, 1990, Problem Assessment Report No 38009-2, and <br /> RESNA, December 8, 1992, Letter Report No, 38009-4) <br /> 38009-4 <br /> 380Q9-4 <br />