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ATC Associates SITE SAFETY PLAN <br /> FACILITY BACKGROUND <br /> According to information supplied by the City of Stockton, the following USTs were removed <br /> from the site on the given dates, and the excavations backfilled. <br /> T-1 550-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 /> In 1988, the City of Stockton contracted RESNA Industries Inc. to conduct a subsurface <br /> investigation to assess the extent of residual hydrocarbons in soil. <br /> The investigation included drilling seventeen soil borings, installing five groundwater <br /> monitoring wells, five vapor extraction wells, one piezometer, and one recovery well, <br /> collecting and analyzing soil and groundwater samples, monitoring fluid levels in the wells, <br /> performing a groundwater aquifer test, and performing a soil vapor extraction test. <br /> WORKPLAN <br /> Task One: <br /> Perform a vapor extraction pilot test on wells VW-1 and VW-5s using an IC engine <br /> and associated equipment. Four vapor samples will be collected and the samples <br /> will be analyzed for BTEX (EPA Method 8020) and TPHg (EPA Method 8015 <br /> Modified). <br /> Task Two: <br /> Perform an air sparge pilot test on well VW-2d using a blower, helium infector, and <br /> associated equipment. Two vapor samples and three groundwater samples will be <br /> collected and samples will be analyzed for BTEX and TPHg. <br /> r <br /> PAGE 4 <br />