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3.3 Free Product Removal <br /> Because free product was encountered in MW-4 during the quarterly monitoring event in <br /> September 1994, a free product removal plan was proposed and implemented Initially, <br /> GeoAudit had proposed to remove free product weekly and then twice a month thereafter <br /> I However, the presence of free product steadily decreased During the December monitoring, <br /> no free product was encountered in NlW-4 <br />' 4.0 FINDINGS <br /> 4.1 Groundwater Elevation and Gradient <br /> The relative elevation of groundwater in each N;ell was calculated by subtracting the <br /> groundwater depth from the surveyed casing elevation (Table 2) The average depth to <br /> groundwater at the site is 54 42 feet bas Thus represents appro"imately a one foot drop in ✓ <br /> ground-water from September 1994 to December 1994 The groundwater gradient and flow <br /> direction in December 1994 was calculated to be 0 0018 ft/ft directed N 77' E (Figure 3) <br /> This is consistent with previous monitoring events t _/ <br /> I <br /> TABLE 2 <br /> RELATIVE GROUNDWATER ELEVATIONS* <br /> Larry's auto Repair <br /> 308 North Giant Street, Stockton, Cahroinia <br /> Depth to Gioundvatei Relative Groundwater <br /> Relative Elevation <br /> Well No Casing 2-22-94 9-'_3-94 12-14-94 2-22-94 9-23-94 12-14-94 <br /> Elevation I ti <br /> IMW-1 9783 5529 5551 5445 4254 4232 4338 <br /> MW-2 9749 5487 55 12 5407 4262 4237 4342 <br /> MW-3 9800 5533 5556 5451 4267 4244 4349 <br /> MW-4 97 86 55 57 55 68 5463 4229 4222 4323 <br /> Ieasurunents in Yeet <br /> 4.2 Petroleum Hydrocarbon Impacted Groundwater <br /> ITPH asg asoline was detected in MW-1, MW-2, MW-3 and MW-4 at concentrations of 5,100 <br /> µg/L (pacts per billion, ppb), 46,000 ppb, 6,900 ppb and 120,000 ppb, respectively TPH as <br /> diesel was detected in MW-4 at 55,000 ppb Benzene, toluene, etlilybenze and xylene were <br /> Cilp16K1A dq S.— SRC <br /> twy.A.I.R.pur 4842 9QJ17 5 6 <br />