Laserfiche WebLink
1 <br /> In July 1986 , BC installed monitoring well 5 (MW-5) . <br /> Petroleum hydrocarbons were detected in the soil <br /> (concentrations up to 1,1.00 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. 90-7021 <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 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 />' On May 20{ 1991, Blaine Tech Services, Inc. (BTS) , performed <br /> the sampling of the newly constructed monitoring wells 10, <br /> 111 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 />