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i <br /> GSI <br /> GeoStrategles Inc. <br /> January 28, 1993 <br /> UNOCAL Corporation <br /> P O Box 5155 <br /> San Ramon, California 94583 <br /> Attn Mr David Camille <br /> Re QUARTERLY MONITORING REPORT <br /> UNOCAL Service Station No 6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Mr Camille <br /> a This Quarterly Monitoring Report has been prepared by GeoStrategies <br /> i Inc (GSI) and presents the results of the 1992 fourth quarter sampling <br /> 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 /> 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 <br /> on October 21 , 1992 Static ground-water levels were measured from <br /> I the surveyed top of the well casing and recorded to the nearest <br /> +001 foot Water-level elevations were referenced to Mean Sea Level <br /> (MSL) datum and are presented in Table 1 . Water-level data were used <br /> to construct a quarterly potentiometric map (Plate 3) The shallow <br /> ground-water flow direction is to the northwest with an approximate <br /> hydraulic gradient of 0 007 <br /> i Each well was checked for the presence of floating product Floating <br /> product was not observed in the wells this quarter The field data <br /> sheets are included in Appendix A Approximately 87 gallons of purge <br /> water was collected and transported to Gibson Environmental TSD <br /> Recycling in Redwood City for disposal <br /> I� <br /> 785501-3 <br /> 2140 WEST WINTON AVENUE • HAYWARD, CALIFORNIA 94545 • (510) 352-4800 <br /> 601 UNIVERSITY AVENUE • SUITE 150 * SACRAMENTO, CALIFORNIA 95825 9 (916) 568-7500 <br />