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EIV <br /> .. ... SFr.;:r <br /> OCT 0 -1992 <br /> ENVIRON <br /> PE <br /> GeoStrategies I'nc.. <br /> I°tf� Y/S�.R <br /> VjdS <br /> { 2140 WEST WINTON AVENUE <br /> fF <br /> HAYWARD,.CALIFORNIA 94545 (510)352-4800 <br /> { October 2, 1992 ' <br /> Unocal .Corporation <br /> P.O. Box -51-55 v. <br /> San Ramon; California 94583 <br />{ Ann: ,Ms.` Penny`1.. Silzer <br /> Re:. , QUARTERLY MONITORING REPORT <br /> i Unocal Bulk Plant No. 0788. :,- <br /> 8203 'East 11th Street <br /> Tracy, California . <br /> 4W <br /> Ms.`Silzer_ . <br /> This. Quarterly . Monitoring Report •has been prepared: .by G.eoStrateges <br /> Inc IGSI).. and- presents°`the results of ,the :1992 -third quarter. sampling , <br /> for .the above referenced site :;(Plate . 1): <br /> There are ,currently ten: monitoring. wells. at, site; Wells. U-1 through <br /> U-10 (Plate 2). These wells were•, installed -between.. :1990 and 1992 by <br /> Pacific Environmental -Group, Inc. <br /> CURRENT: QUARTER SAMPLING. RESULTS <br />` ..:Depth., to. water. measurements were obtained In-. each monitoring well <br /> on August 6, 1.992. :Static ground-water levels weremeasuredfrom the <br /> surveyed top of-the-;well box:..and recorded 'to the nearest. ±0.01 foot. <br /> Water-level -elevations were referenced to `Mean Sea , evel {MSL): datum <br /> -and are 'presented in' Table 1 .- Waterleve[:-data were used to 'construct' <br /> _ a� _quarterly potentiometric 'map ..(Plate 3), Shallow ground`-water flow <br /> direction is to the, northeast with -an. 'approximate°hydraulic gradient of <br /> 0:004. <br /> f . 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`: <br /> i <br /> 784601=2 <br /> i <br />