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(up to 240 ppm TPH-G, up to 10 ppm 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 CRWQCB in March 1990, BC performed quarterly <br />' sampling of monitoring wells 1 through 5, May 4 , 1990. The <br /> results of this sampling episode are represented as Table 1. <br /> TABLE 1 <br />' GROUNDWATER SAMPLE ANALYSES <br /> (5-4-90) <br /> SAMPLE LOCATION/CONCENTRATION <br />' CONSTITUENT MW-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 /> i 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 . The results of this sampling <br /> episode are represented as 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 /> STE Project No. 4001 <br /> Page 2 <br />