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In July 1986, BC installed monitoringwell 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 /> 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 NW-8 NW-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 /> On May 20 , 1991, Blaine Tech Services, Inc. (BTS) , performed <br /> the sampling of the newly constructed monitoring wells 10, <br /> 11 , 12 , 13 , and EW-1 (Figure 2) . The results of this <br /> sampling episode are represented as Table 3 . <br /> STE Project No. 4001 <br /> Page 2 <br />