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TABLE 4 <br /> ANALYTICAL RESULTS OF GROUNDWATER SAMPLES <br /> ' Hess-DuBois Cleaners <br /> 348 West Harding Way, Stockton, California <br /> (µg/L) <br /> Sample I.D./ TPH as Ethyl- X lenes <br /> Date Stoddard Benzene Toluenebenzene y <br /> Solvent <br /> MW-1/11-4-93 660 3.4 ND 4.3 3.9 <br /> MW-1/6-22-94 190 ND ND ND ND <br /> MW-1/9-27-94 160 ND ND ND ND <br /> MW-1/12-28-94 180 ND ND ND ND <br /> ' MW-2/11-4-93 880 ND ND 4.3 6.2 <br /> MW-2/6-22-94 670 ND ND ND ND <br /> MW-2/9-27-94 600 ND ND ND ND <br /> MW-2/12-28-94 740 ND ND ND ND <br /> MW-3/11-4-93 41,000 29 ND 120 610 <br /> MW-3/6-22-94 2,800 ND ND 17 1.5 <br /> MW-3/9-27-94 880 1.2 ND 15 2.4 <br /> MW-3/12-28-94 1,900 ND ND ND ND <br /> Mpt = Harts}ger billion <br /> ' 5.2 Petroleum Hydrocarbon Impacted Soil <br /> Petroleum hydrocarbon impacted soil remains in the vicinity-of MW-3. The extent of the <br /> ' impacted soil has not been determined. At-least three additional borings should be drilled <br /> near.MW-3 to determine the lateral extent of impacted soil. <br /> 5.3 Petroleum Hydrocarbon Impacted Groundwater <br /> Concentrations of TPH as Stoddard Solvent increased in all three monitoring wells between <br /> September and December 1994. BTE&X have not been detected in MW-1 and MW-2 since <br /> initial sampling in November 1993. Very low concentrations of benzene, ethylbenzene and <br /> ' xylenes were detected in MW-3 during the third quarter of 1994. However, no volatile <br /> aromatics were detected in MW-3 during the fourth quarter. <br /> The lateral extent-of the impacted groundwater has not been determined. GeoAudit has <br /> prepared a work plan for installation of two additional monitoring wells at the site. Drilling <br /> is scheduled to commence during the first quarter of 1995. <br /> t4ealaSiM Mdn 5—k..I - (� <br /> liu-WHoM QAU12-26-9N'i3 9 <br />