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I I � WA Working To Restore Nature 1710 Main Street J Escalon, CA 95320 Phone (209) 838-3507 FAX (209) 838-3509 September 1, 1994 Mr James Escobar Department of Public Works City Hall Stockton, California 95202-1997 Subject Second Quarter 1994 Status Report, Fire Engine Company No. 2, 110 West Sonora Street, Stockton, California Mr. Escobar: This letter report summarizes the results of the environmental investigation conducted during the second quarter 1994 by RESNA Industries Inc (RESNA) at the subject site (Plate 1). The work i� was conducted at the request of the City of Stockton, Department of Public Works (City of Stockton) and included measuring depths to groundwater, collecting groundwater samples from the wells for subjective and laboratory analyses, and evaluating the groundwater gradient and direction of groundwater flow beneath the site BACKGROUND In April 1987, a 1,000-gallon unleaded gasoline tank was removed and residual hydrocarbons were detected in the soil remaining under the former tank. In April 1992, a 250-gallon waste-oil tank was removed. The locations of the former and existing tanks are shown on Plate 2. In 1988, The City of Stockton contracted RESNA to conduct a subsurface investigation to assess the extent of residual hydrocarbons in soil The investigation performed between 1988 and 1993 included drilling seventeen soil borings, installing five groundwater monitoring wells, five vapor extraction wells, one piezometer, and one recovery well, collecting and analyzing soil and groundwater samples for hydrocarbons, and performing a groundwater aquifer test and a soil vapor extraction test GROUNDWATER MONITORING On April 28, May 31, and June 28, 1994, a RESNA technician measured the water levels in wells MW-1 through MW-5, well RW-1, and piezometer PZ-1 (on April 28 well MW-2 could not be monitored because a truck was parked over the well) On June 28, 1994, groundwater