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1117 Lone Palm Suite u6 <br /> Cr Modesto CA 95351 <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> A S S O C I A T E S I N C Y <br /> 1 i_ <br /> February 1, 1999 <br /> 62574 V0 <br /> li r <br /> Mr Jeff Wong <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Street, 3rd Floor <br /> Stockton, CA 95202 <br /> Subject Fourth Quarter 1998 Status Report, Fire Engine Company No 2, 110 West <br /> Sonora Street, Stockton, California <br /> Dear Mr Wong <br /> This letter report summarizes the results of the environmental investigation conducted during the <br /> fourth quarter 1998 by ATC Associates Inc at the subject site (Figure 1) The work was <br /> conducted at the request of the San Joaquin County Public Health Services Environmental Health <br /> Division (PHS/EHD) and included measuring depths to groundwater, collecting groundwater <br /> samples from the monitoring wells for subjective and laboratory analyses, and evaluating the <br /> groundwater gradient and direction of groundwater flow beneath the site <br /> BACKGROUND <br /> i <br /> According to information supplied by the City of Stockton, the following USTs were removed from <br /> the site on the given dates, and the excavations backfilled <br /> T-I 550-gallon Diesel Removed 10/28/93 <br /> T-2 1,000-gallon Regular Unleaded Removed 10/28/93 <br /> T-3 1,000-gallon Unleaded Removed 04/01/87 <br /> T-4 350-gallon Waste Oil Removed 04/23/92 <br /> T-5 550-gallon Diesel Removed 10/28/93 <br /> T-6 1,000-gallon Gasoline/Water Removed 08/07/87 <br /> The locations of the former tanks T-1 through T-5 are shown on Figure 2 In 1988, the City of <br /> Stockton contracted RESNA Industries Inc to conduct a subsurface investigation to assess the <br /> extent of residual hydrocarbons in soil The investigation included drilling seventeen soil borings, <br /> installing five groundwater monitoring wells, five vapor extraction wells, one piezometer, and one <br /> recovery well, collecting and analyzing soil and groundwater samples, monitoring fluid levels in <br /> the wells, performing a groundwater aquifer test, and performing a soil vapor extraction test <br /> w 162574162574 0119436714QSR98doc I <br />