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► GS1 <br /> GeoStrategies Inc. <br /> September 23, 1993 <br />► UNOCAL Corporation <br /> P 0 Box 5155 <br /> San Ramon, California 94583 <br /> Attn Mr David J Camille <br /> I <br /> Re QUARTERLY MONITORING REPORT <br /> UNOCAL Service Station No 6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> I <br /> Mr Camille <br /> This Quarterly Monitoring Report has been prepared by GeoStrategies Inc <br /> I (GSI) and presents the results of the 1993 third quarter groundwater <br /> sampling for the above referenced site (Plate 1 ) <br /> There are currently thirteen monitoring wells at the site, Wells MW-1 <br /> through MW-13 and one recovery well (PTW-1 ) (Plate 2) These wells <br /> I were installed between 1989 and 1992 by Applied GeoSystems/RESNA <br /> i <br /> CURRENT QUARTER SAMPLING RESULTS <br /> Depth-to-water measurements were obtained in each monitoring well on <br />► July 26, 1993 Static groundwater levels were measured from the <br /> surveyed top of the well casing and recorded to the nearest ±0 01 foot <br /> Water-level elevations were referenced to City of Stockton datum and are <br /> presented in Table 1 Water-level data were used to construct a quarterly <br /> potentiometric map (Plate 3) The shallow groundwater flow direction is <br /> to the northeast with an approximate hydraulic gradient of 0 006 <br /> I Groundwater flow direction and gradient are consistent with historical <br /> data at this site <br /> I 785580-6 <br /> 2140 WEST WINTON AVENUE - HAYWARD, CALIFORNIA 94545 - (510) 352-4800 <br /> I 601 UNIVERSITY AVENUE - SUITE 150 - SACRAMENTO, CALIFORNIA 95825 - (916) 568-7500 <br />