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. Table 1 , continued Date/ Well Depth to TPH-D TPH-G rB T E X Number Water (ppb) ( ppb) (ppb) ------------------------- ---------------------------------- 12/ 2/ 93 MW-1 7 20 ft N D 170 110 3 55 45 MW-2 6 85 ft N D 100 26 7 5 3 MW-3 6 40 ft N D N D N D N D N D N D _----------------------------___-_-------------------__------- Method Detection 50 50 0 2 0 2 0 2 0 6 Limit ------------------------- ---------------------------------- *Although not required by PHS/EHD , analyses were also performed for Total Oil and Grease (TOG) on the samples acquired on August 16-18 , 1993 using SM 5520 B&F All samples were free of detectable concentrations of TOG TPH-D Total Petroleum Hydrocarbons as Diesel TPH-G Total Petroleum Hydrocarbons as Gasoline . BTEX Benzene , toluene , ethylbenzene , total xylenes ppb Parts per billion N D Not detected SUMMARY OF OTHER ENVIRONMENTAL ACTIVITIES PERFORMED DURING THE PAST QUARTER Proposals for additional assessment activities have been submitted to PHS/EHD Copies of the proposal have also been forwarded to the Central Valley Regional Water Quality Control Board and the City of Tracy ( from which an encroachment permit has been requested for advancing soil borings along Grant Line Road) Underground Service Alert has been advised of the proposed drilling and has marked the area in question The direction of groundwater flow and hydraulic gradient have been calculated for both the August 16-18 , 1993 and December , 1993 sampling events During August , groundwater flowed N-22o-E at 0 0049 ft/ft On December 2 , 1993 , groundwater was flowing N-23o-E at 0 006 ft/ft Infor- mation regarding the methodology used to determine the direction of flow and hydraulic gradient is presented in Appendix B Page 4