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GROUNDWATER SAMPLING <br /> The wells were purged to dryness. The groundwater samples were <br /> collected via a clean bailer, placed in 40 ml VOAs, labeled, placed <br /> in a cooled ice chest and transported to a state certified <br /> laboratory (MCCAMPBELL ANALYTICAL INC. ) under Chain of Custody <br /> (COC) documentation for analysis. The groundwater samples from the <br /> three wells had a sheen on the sample surface. <br /> ANALYTICAL RESULTS <br /> The analytical methods are those required in the "Tri-Rectional <br /> Guidelines" which are directives of the Regional Water Quality <br /> Control Board and requested by the SJCEHD. <br /> The analyses completed were for Total Petroleum Hydrocarbons, as <br /> gasoline (TPHG) ; Benzene, Toluene, Ethylbenzene and Xylene (BTEX) <br /> and Methyl-tert-butyl ether (MTBE) via EPA Modified Method <br /> 8020/8015. <br /> The results of the groundwater samples in ug/L (parts per billion <br /> {ppbl ) for TPHG, MTBE and BTEX are shown in Table 2 . <br /> TABLE 2 <br /> September 11, 1996 <br /> ppb <br />. Sample ID TPHG MTBE B T E X <br /> MW-1 15, 000 80 3 , 800 1,200 600 1, 300 <br /> MW-2 110, 000 300 5, 600 261000 4 , 000 20, 000 <br /> MW-3 300 ND 14 58 7 . 6 44 <br /> Laboratory Data Sheets with detection limits and a copy of the <br /> Chain of Custody (COC) are contained in Appendix B. <br /> SUMMARY, CONCLUSIONS AND RECOMMENDATIONS <br /> The calculated gradient is S 47oW or 2270 at 0. 007 ft/ft. This is <br /> a generally southerly gradient. The direction and slope are <br /> similar to the prior calculated gradients. The gradient direction <br /> is inconsistent with the assumed regional gradient. <br /> Based on the analytical data from prior quarterly reports, it <br /> appears that no detectable concentrations or lead are impacting the <br /> groundwater at this site. <br />.} 5 <br />