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1 <br /> 1 <br /> 2 <br /> Toluene, Ethylbenzene, and Xylene). Higher levels of hydrocarbon contamination was <br /> encountered in GL-2 and GL-3 (up to 240 ppm TPH-G, up to 10 ppm toluene, and up to <br /> 32 ppm xylenes). (See Figure 2 for boring locations). <br />' In July 1986, BC installed monitoring well 5 (MW-5). Petroleum hydrocarbons were <br /> detected in the soil (concentrations up to 1,100 ppm TPH-G, 17 ppm Benzene, 36 ppm <br />' Toluene, and 97 ppm xylenes) and in the groundwater (concentration up to 11 ppm <br /> TPH-G, 0.12 ppm Benzene, 0.1 ppm toluene, and 0.28 ppm xylenes). (See Figure 2). <br />' In accordance with Cleanup and Abatement Order No. 90-702, issued by the Regional <br /> Board in March 1990, BC performed quarterly sampling of monitoring wells 1 through 5, <br /> May 4, 1990 (Table 1). <br />' TABLE 1 <br /> GROUNDWATER SAMPLE ANALYSES <br />' (5-4-90) <br /> iiWx..::.......... <br /> y ............. <br /> ^.. :. <br /> ............: <br /> ::::i:l.:,:..:i•:!;•.:::::.::..:........ ..}..:_ :..:::.r:::-.;'::: :i:::tiff. <br /> :?':}{� : <br /> Benzene 230,0 ND 28.0 2800.0 96.0 <br /> Toluene 190.0 ND 3.7 890.0 9.0 <br /> Ethylbenzene ND ND 13.0 54.0 ND <br /> Xylene 44.0 ND 53.0 1 1100.0 1 75.0 <br /> TPH-3asellne 1900.0 ND 1300.0 1 7800.0 280.0 <br /> NOTE:ND Represents none detected <br />' On July 7, 1990, BC performed the quarterly sampling of monitoring wells 6 through 9 <br /> (Table 2). <br /> TABLE 2 <br />' GROUNDWATER SAMPLE ANALYSES <br /> (7-7-90) <br /> `O <br /> << < <br /> ..............::.:............................. <br /> ; <br />' =:_ .:......:.:..::.. :::::,,"[::',iti:ti:i::1:::.`-iii::r?S::ti: •14... i::':':':':::..::'.':: <br /> X. <br /> :.'::ii:i is_i:L:iiv <br /> Benzene ND 3.7 140.0 150.0 <br /> Toluene 2.2 0.6 55.0 72.0 <br /> Ethylbenzene 0.3 0.9 160.0 83.0 <br />' xylene 3.4 7:3 60.0 190.0 <br /> TPH-Gasollne ND 350.0 1700.0 2300.0 <br /> On May 20, 1991, Blaine Tech Services, Inc. (BTS), performed the sampling of the <br />' newly constructed monitoring wells 10, 11, 12, 13, and EW-1 (Figure 2). The results of <br /> this sampling episode are represented as Table 3. <br /> II <br />