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As requested by Mr. Steve Schneider of the San Joaquin County <br /> Public Health Services Department, the extraction well (EW-1) <br /> was purged and sampled, January 24 , 1992 Mr. Schneider was <br />' on site to observe the sampling of EW-1. <br /> The results of this sampling activity as well as the results <br />' from the December 25 , 1991 sampling episode were presented as <br /> an addendum report in January 1992. <br /> The groundwater sample was analyzed by a California certified <br />' laboratory (Sherwood Labs Corp. ) using EPA method 602 for BTEX <br /> analysis, with a detection limit of 0. 3 ug/Kg, and EPA method <br /> 5030/Mod. 8015 for TPH-Gasoline analysis, with a detection limit <br /> of 50.0 ug/L (Table 7) . <br />' TABLE 7 <br /> GROUNDWATER SAMPLE ANALYSES <br /> (1-24-92) <br /> SAMPLE LOCATION/CONCENTRATION <br /> CONSTITUENT EW-1 NDL <br />' (ug/L) (ug/L) <br /> Benzene 450. 0 0. 3 <br /> Toluene 10. 0 0. 3 <br /> Ethylbenzene 86. 0 0. 3 <br /> Xylene 471. 0 0. 3 <br /> TPH-Gasoline 8900. 0 50.0 <br /> NOTE: ND Represents none detected <br /> On June 29, 1992 , SUN TECH sampled monitoring well 4 , 6 , 7 , <br /> 10, 11, 12 and 13 . <br /> The groundwater samples were analyzed by a California certified <br /> laboratory (Sherwood Labs Corp. ) using EPA method 602 for BTEX <br /> analysis, with a detection limit of 0._3 ug/Kg, and EPA method <br /> 5030/Mod. 8015 for TPH-Gasoline analysis, with a detection limit <br /> of 50.0 ug/L (Table 8) . <br />' TABLE 8 <br /> GROUNDWATER SAMPLE ANALYSES <br /> ( 3-26-92) <br />' SAMPLE LOCATION/CONCENTRATION <br /> MW-4 MW-6 MW-7 MW-10 MW-11 MW-12 MW-13 BLANK <br /> (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> B 4475.0 ND ND ND ND ND ND ND <br /> T 3650.0 ND ND ND ND ND ND ND <br /> E 650.0 ND ND ND ND ND ND ND <br /> X 1975.0 ND ND ND ND ND ND ND <br /> TPH-G 56000 .0 ND ND 65.0 ND ND ND ND <br /> NOTE: ND Represents none detected <br />' STE Project No. 4001 <br /> Page 5 <br />