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On September 25 , 1991, BTS performed the quarterly sampling <br />' of monitoring wells 6, 10 , 11, 12, and 13 . Water levels in <br /> the other monitoring wells was not sufficient to allow <br /> Purging and sampling. The results of this sampling episode <br /> are represented as Table 5. <br />' TABLE 5 <br /> GROUNDWATER SAMPLE ANALYSES <br /> (9-25-91) <br />' SAMPLE LOCATION/CONCENTRATION <br />' CONSTITUENT MW-6 MW-10 MW-11 MW-12 MW-13 <br /> (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> Benzene ND" ND 0. 3 ND ND <br /> Toluene 0 .5 ND ND ND ND <br /> Ethylbenzene ND ND ND ND ND <br /> Xylene 1. 2 ND ND ND ND <br /> TPH-Gasoline ND ND ND ND ND <br /> NOTE: ND Represents none detected <br /> I On December 9, 1991, SUN TECH sampled eight monitoring wells <br /> located on, or within, the vicinity of the GLDM property <br /> located at 16 Cherokee Lane, Lodi, California. <br /> Although 13 monitoring wells, and 1 extraction well exist on, <br /> > or near the subject property (Figure 2) , only 8 of the <br /> monitoring wells contained sufficient quantities of water for <br /> purging and sampling. The 6" extraction well was not sampled <br /> at this time. <br /> Linda A. Turkatte, Environmental Health Specialist for the <br /> San Joaquin County Public Health Services Department, was on <br /> site to observe the December sampling activities. <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. (See Table 6 and Appendix A) . <br /> STE Project No. 4001 <br />' " • Page 4 <br />