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l - <br /> i - <br /> - <br /> GeoStrategies fInc. <br /> [GS1 <br /> (, <br /> October;.251 -1953; <br /> UNOCAL Corporation <br /> P.O. Box 515-5 <br /> -San Ramon,,California, 9583 <br /> Attn: W. Pen, hy L. Sllzer <br /> Re: QUARTERLY MONITORING I�EPbRT <br /> UNOCALBulk Plant No.-:678-8 <br /> 8203 East 1,1 th Street <br /> U ' Tracy; California <br /> Ms. Silzer-' <. <br /> / <br /> Thi s.Quarter.ly Monitoring Report has been.prepared b-yGeoStrategies Inc. <br /> (GSU and presents the results.,of the 1993 third quarter sampling for the <br /> above referenced-site (Plate A). <br /> There are .currently ten monitoring wells at the site; :Wells U-1 through <br /> U-1-0.(Plate- 2). These wells were-installed between 1990.and 1992 by <br /> 4d Pacific Environmental-Group, Inc.' <br /> CURRENT QUARTER.SAM RLING.RESULTS <br /> Depth.to water measurements were obtained in each monitoring well on. <br /> August 24, .1991 Static groundwater aevels were measuredfrom:the- <br /> surveyed top of the well box and.:recorded',to the nearest ±0.01 foot. <br /> Water-level. elevations were.referend,to Mean,Sea Level (MSL) and are <br /> preseented' irnTable 1 . Water level data were used to construct.a.quarterly <br /> potent'iometric map (PI t6 3). Shallow groi�nd'water flow direction is to the. <br /> -.northwest with an'.approximate hydraul:ic'gradient.of,-0:.005. <br /> Each .well W88 : fo:r the. presence of floating: product. Floating <br /> product was not observed in, the wells this quarter: Floating product has. <br /> never teen observed in the wells at:this site:.. The":field data-.sheets. are <br /> £, <br /> GS1 <br /> included in.`Appendix <br /> 784680-6 <br /> 6747 SIERRA COURT _•-:$PITE. G .4�;DUBLIN'; CALIFORNIA 94568 • (510) 551-8777 <br />