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STE Project No. 4001-001 <br /> Page 2 <br />' hydrocarbon contamination was encountered in GL-2 and GL-3 <br /> (up to 240 ppm TPH-G, up to 10 Vpm toluene, and up to 32 ppm <br /> xylenes) . (See Figure 2 for boring locations) . <br />' In July 1986 , BC installed monitoring well 5 (MW-5) . <br /> Petroleum hydrocarbons were detected in the soil <br /> (concentrations up to 1 ,100 ppm TPH-G, 17 ppm Benzene, 36 ppm <br />' Toluene, and 97 ppm xylenes) and in the groundwater <br /> (concentration up to 11 ppm TPH-G, 0 .12 ppm Benzene, 0. 1 ppm <br /> toluene, and 0. 28 ppm xylenes.). (See Figure 2 ) . <br />' In accordance with Cleanup and Abatement Order No. 90-702 , <br /> issued by the Regional Board in March 1990 , BC performed <br /> quarterly sampling of monitoring wells 1 through 5 , May 4 , <br /> 1990 (Table 1) . <br />' TABLE 1 <br /> GROUNDWATER SAMPLE ANALYSES <br /> (5-4-90) <br />' SAMPLE LOCATION/CONCENTRATION <br /> CONSTITUENT NW-1 MW-2 MW-3 MW-4 MW-5 <br />' (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <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 1100.0 75.0 <br /> TPH-Gasoline 1900 .0 ND 1300. 0 7800.0 280 . 0 <br /> NOTE: ND Represents none detected <br />' On July 7 , 1990 , BC performed the quarterly sampling of <br /> monitoring wells 6 through 9 (Table 2) . <br /> TABLE 2 <br /> GROUNDWATER SAMPLE ANALYSES <br /> (7-7-90) <br /> SAMPLE LOCATION/CONCENTRATION <br /> CONSTITUENT MW-6 MW-7 MW-8 MW--9 <br /> (ug/L) (ug/L) (ug/L) (ug/L) <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 . 3 160 .0 190. 0 <br /> TPH-Gasoline ND 350.0 1700 .0 2300. 0 <br /> NOTE: ND Represents none detected <br /> 1 <br />