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' As requested by Mr. Steve Schneider of the San Joaquin County Public Health Services Department, the extraction well (EW-1) ' was purged and sampled, January 24 , 1992. Mr. Schneider was on site to observe the sampling of EW-1. The results of this sampling activity as well as the results ' from the December 25 , 1991 sampling episode were presented as an addendum report in January 1992 . The groundwater sample was analyzed by a California certified ' laboratory (Sherwood Labs Corp. ) using EPA method 602 for BTEX analysis, with a detection limit of 0. 3 ug/Kg, and EPA method 5030/Mod. 8015 for TPH-Gasoline analysis, with a detection limit ' of 50 .0 ug/L (Table 7) . TABLE 7 GROUNDWATER SAMPLE ANALYSES ' (1-24-92 ) SAMPLE LOCATION/CONCENTRATION ' CONSTITUENT EW-1 MDL (ug/L) (ug/L) Benzene 450 . 0 0. 3 ' Toluene 1.0 . 0 0. 3 Ethylbenzene 86 . 0 0. 3 Xylene 471. 0 0 . 3 TPH-Gasoline 8900. 0 50.0 NOTE: ND Represents none detected On June 29 , 1992 , SUN TECH sampled monitoring well 4 , 6 , 7 , 104, 11, 12 and 13 . The groundwater samples were analyzed by a California certified ' laboratory (Sherwood Labs Corp. ) using EPA method 602 for BTEX analysis, with a detection limit of 0 . 3 ug/Kg, and EPA method 5030/Mod. 8015 for TPH-Gasoline analysis, with a detection limit of 50 .0 ug/L (Table 8) . TABLE 8 GROUNDWATER SAMPLE ANALYSES ( 3-26-92) SAMPLE LOCATION/CONCENTRATION MW-4 MW-6 MW-7 MW-10 MW-11 MW-12 MW-13 BLANK (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) B 4475. 0 ND ND ND ND ND ND ND T 3650.0 ND ND ND ND ND ND ND E 650.0 ND ND ND ND ND ND ND X 1975.0 ND ND ND ND ND ND ND TP H-G 56000.'0 ND ND D65 . 0 ND ND ND ND NOTE: ND Represents none detected now STE Project No. 4001 Page 5