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i <br /> Feasibility Study Report <br /> 1140 W Hammer Lane, Stockton, CA <br /> material results in lugh well yields Specific capacities of wells completed in the older alluvium average <br /> 42 GP"ft (USGS Professional Paper 1401-D, 1989) <br /> Drinking wells in the region are generally completed at depths greater than 100 feet below ground <br /> surface due to the relatively poor quality of near surface groundwater, although some older wells were <br />' known to have been completed at shallower depths <br /> Regional groundwater flow in the site area is generally in a southwesterly direction toward the San <br /> Joaquin River Delta, or easterly toward a regional groundwater depression centered about 4 mules east <br /> of Stockton (San Joaquin County Flood Control and Water Conservation District, Fall 1998) <br />' Published data from the San Joaquin Flood Control and Water Conservation District indicate that the <br /> average depth to groundwater at the site has vaned from approximately 65 feet below grade (Fall <br /> 199 1) to 35 feet below grade (Spring 1986 and Fall 1998) Current depth to groundwater at the site is <br /> • approximately 30 5 to 32 5 feet below grade <br /> 40 PREVIOUS WORK <br /> 4.1 Underground Tank Removal <br /> All buildings, pump islands, underground fuel storage tanks and associated product lines were <br /> removed on or before March 17, 1987 Residual hydrocarbons were observed in soils beneath the <br />' former tanks Analytical results of soil samples are summarized in Table 2 <br />' 4.2 Subsurface Investigation <br /> Groundwater Technology, Inc (GTI) performed the initial subsurface investigation On April 10, <br /> 1987, GTI collected con£nnation soil samples (SS-1, SS-2, SS-3) from beneath tanks 5 and 6 at <br /> depths of 30 to 34 feet Analytical results indicated the presence of low levels of petroleum <br />' hydrocarbons (Table 2) <br /> Between August 24, 1987 and January 11, 1989, GTI drilled 11 soil borings (SB I through SB 11) and <br /> • installed seven groundwater monitoring wells (MW I through MW7) for the purpose of further <br /> G IU111a1GROUNDMKNOWE LS HAMIRFPOR rS1Fea4ibjljcykepoit dog <br />