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1 RECEIVED <br /> AU G 10 1992 <br /> ENViPONMENIA� HEALTH <br /> PERM iT/SERViCES <br /> 1 GeoStrategies Inc. <br /> GSI 2140 WEST WINTON AVENUE <br /> 1IAYWARD, CALIFORNIA 94545 (510) 352-4800 <br /> August 4, 1992 <br /> 1 <br /> UNOCAL Corporation <br /> P O Box 5155 <br /> San Ramon, California 94583 <br /> Attn Ms Penny Silzer <br /> Re QUARTERLY MONITORING REPORT <br /> UNOCAL Service Station No 6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Ms Silzer <br /> This Quarterly Monitoring Report has been prepared by GeoStrategies Inc (GSI) <br /> and presents the results of the 1992 second quarter sampling for the above <br /> referenced site (Plate 1) <br /> There are currently eight monitonng wells at the site, Wells MW-1 through <br /> MW-8 (Plate 2) These wells were installed between 1989 and 1992 by Applied <br /> GeoSystems/RESNA <br /> CURRENT QUARTER SAMPLING RESULTS <br /> Depth to water measurements were obtained in each monitoring well on Apnl <br /> 16, 1992 Static ground-water levels were measured from the surveyed top of <br /> the well casing and recorded to the nearest +001 foot Water-level elevations <br />` were referenced to Mean Sea Level (MSL) datum and are presented in Table 1 <br /> Water-level data were used to construct a quarterly potentiometnc map (Plate <br /> 3) Shallow ground-water flow direction is to the northeast with an approximate <br /> hydraulic gradient of 0 008 <br /> Each well was checked for the presence of floating product Floating product <br /> was not observed in the wells this quarter <br /> 785501-1 <br />