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RECEIVED <br /> MAR 1 1999 <br /> ENVIRONMENTAL MEALT14 <br /> GeoStrategies Inc. PERMIT/SERVICES <br /> February 19, 1993 <br /> 0 UNOCAL Corporation <br /> P O Box 5155 <br /> San Ramon, California 94583 <br /> Attn Mr David Camille <br /> 1 <br /> Re QUARTERLY MONITORING REPORT <br /> UNOCAL Service Station No 6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> 1 <br /> Mr Camille <br /> This Quarterly Monitoring Report has been prepared by GeoStrategies Inc <br />�. (GSI) and presents the results of the 1993 first quarter sampling for the <br /> 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 /> were installed between 1989 and 1992 by Applied GeoSystems/RESNA <br /> CURRENT QUARTER SAMPLING RESULTS <br /> Depth to water measurements were obtained in each monitoring well on <br /> January 13, 1993 Static ground-water 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 Mean Sea Level (MSL) datum <br /> and are presented in Table 1 Water-level data were used to construct a <br /> quarterly potentiometnc map (Plate 3) The shallow ground-water flow <br /> direction is to the northeast with an approximate hydraulic gradient of <br /> 0 005 <br />• <br /> 785580-4 <br /> 2140 WEST WINTON AVENUE • HAYWARD, CALIFORNIA 94545 • (510) 352-4800 <br /> 601 UNIVERSITY AVENUE + SUITE 150 • SACRAMENTO, CALIFORNIA 95825 • (916) 568-7500 <br />