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l GS' GeoStr_ategies Incj <br /> -Juy 1.99 <br /> :UNOCAL'Corporatiori . <br /> P.O. Box _5155 V <br /> Sari;Ramon.; California: 9458.3 <br /> Attn:�Ms...Penriv-1. S112er <br /> Re. . QUARTERLY MONITORING REPOR.T.t <br /> UNOCAL:Bulk Pl;a;nt No:; 07'8.8 <br /> .8203 East 13 th<Street <br /> Tracy, Cali.forn,ia, <br /> Ms. Silzer: <br /> This Quarterly Monitoring Report has been-prepared by GeoStrateg`ies nc. <br /> YG.SI) and presents the results -of the X1993 second ,quarter sampling for <br /> the.above referenced site (Plate 11.f <br /> There are currently ten. monitoring wells at,.the site; Wells U-1 through-, <br /> :U-:10 (Plate 2):: These wells,.were installed between,1-990 and 1992 by <br /> Pacific Environmental Group, Inc. <br /> CURRENT.QUARTER SAMPLING RESULTS. <br /> Depth to water measurements were :obtained-M each-monitoring well on <br /> l •May-'26 19.93. .Static, groundwater levels were "measured from .the <br /> surveyed top of 'the..weII box and recorde&to the nearest +0:01 foot. <br /> Water level elevations were referenced to Mean Sea-Level (MSL) and are <br /> presented in Table 1'. . Water-level data were-.used to construct a quarterly <br /> potentiometric map (Plate 3:).. Shallow ground=water flow direction is to <br /> the north-west.withan approximate hydraulic gradient-of 0.006. <br /> Each. well was checked- for the presence of.floating product. Floating <br /> product was not observed in the wells this quarter. Floating product has <br /> never been observed in the wells at- this site. The field data sheets are <br /> l <br /> -included in .Appendix-A.- <br /> 784680-5 <br /> :78.4680-5 <br /> 1 - <br /> 2140 WEST WINTON AVENUE • HAYWARD, CALIFORNIA 94545 • (510) 352-4800 <br /> 601 UNIVERSITY AVENUE • SUITE 150 • SACRAMENTO, CALIFORNIA 95825 {916) 568-7500 <br />