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� F rm Fourth Quarter 1992 Activity Report KOK Realty, 2403 W Navy Dr , Stockton, CA February to, 1993 Page 2 site. A detailed discussion of the initial subsurface investigation can be found in RESNA's "Intenm Problem Assessment Report, Soil and Groundwater Contamination, " dated June 8, 1992 Groundwater samples were collected from each monitoring well subsequent to development and submitted to a state-certified laboratory for analysis of BTEX and TPHG Laboratory results indicated that gasoline constituents were present above laboratory method detection limits in the groundwater samples collected from each site monitoring well Initial groundwater monitoring data (March, 1992) determined groundwater flow direction to the south RESNA has been retained by KOK Realty Corp to perform quarterly groundwater monitoring and sampling of the three site monitoring wells This work is being performed at the requested of PHS/EHD GROUNDWATER MONITORING AND SAMPLING . RESNA personnel performed groundwater monitoring in November and December, 1992 Sampling of the site monitoring wells was conducted on November 30, 1992 Field work consisted of measuring the depth-to-water in wells MW1, MW2, and MW3; using a electronic water/product interface probe to determine if free product was present, purging and sampling the wells, and subjectively analyzing collected water samples for the presence of petroleum hydrocarbon constituents Static groundwater elevations were measured in each monitoring well on November 30 and December 16, 1992 Groundwater gradient maps are presented on Figures 2 and 3, respectively Groundwater monitoring data is summarized in Table 1 Figure 2 depicts a northerly groundwater gradient of 0 0043 ft/ft or approximately 23 feet/mile Figure 3 depicts northerly flow at a steeper gradient of 0 0066 ft/ft or approximately 35 feet/mile Fluid level measurements indicated groundwater flow direction beneath the site during the fourth quarter is not consistent with the March 1992 southerly flow direction Groundwater gradient at the site will be closely monitored to evaluate significant trends During the November and December monitorings, free product was detected in well MW2 The electronic water/product interface probe did not detect the presence of free product in either MW 1 or MW3 during monitoring events The probe has an accuracy to the nearest 0 01 foot Approximately 0 5 gallons of free product was removed from MW2 in December 16, 1992 and secured on site in a DOT approved double containment salvage drum 40MR1992 FNL