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iirmuMVED <br /> . _ <br /> .JAN 2 2 1993 <br /> GeciStrategies,.I <br /> ENVIRQNMENTA(.WEALTH . <br /> 1 PERMIT/SERVICES <br /> January <br /> Unocal Corporation <br /> P.0...Box 51:55 <br /> i San:-Ramon ..Califoroia 94583 <br /> At n:` Ms: Pera;ny. L.- ilzer <br /> Re:' IgUARTERLY MONITORING.-REPORT <br /> Unocal uIk'- :Plant No 0788 <br /> 8203 East`11th Street <br /> Tracy, .Califo.r.nia: <br /> This Quarterly. Monitoring Report , has ;been .prepared ;b_y,�..GeoStrategies <br /> Inc. {GSI) and: presents the results of the 1 992 fourth quarter sampling <br /> for the :above re#erenGed site `(Plate r1). <br /> .There are currently' ten .monitonn� wells at� -the',sitey Wells U-1. through. <br /> U=14 (Plate 2). :These wells :;were, installed: between' 1990 -and . 1992 by <br /> Pacific: Environmental:'Group, 'Inc. z <br /> "CURRENT QUARTER: SAMPLING:;RESU;LTS <br /> i.► „ <br /> Depth 'to water,measurements" were o tained �.in each .monitoring well <br /> on November._18,:: 1982.: Static ground-water=levels were measured from <br /> the *surveyed: top,, of the well boz and° recorded: toLthe nearest ±0.01 <br /> foot. .Water-level, elevations were`referenced to Mean'. Sea . Level (MSL) <br /> datum acid are .presented in,: Table, 1'. 'V1/.a'ter=.level .data were used to <br /> E construct a quarterly :' pote:nti6mdtric -map (Plate '3).' :`.Shallow ground- <br /> water flow _direction Is to ;the northwest, with an approximate hydraulic <br /> -g rad ient­of.`0:.004. <br /> Each well was checked-�for',the ,presence. of floating product. Floating <br /> product: was - not observed,.: in the wells than quarter. The field data <br /> sheets .are includedinin APPendix A. -A�proximatelY200gallons of Pur e <br /> water-was .sent-Ao Gibson Oil in Redwood .City, California. <br /> 784601=3 <br /> 2140:WEST WINTOKAVENUE.- 'HAYWARD CALIFORNIA 94545.,• (510) 352-4800. <br /> 601 '7500 AVENUE. • SUITE 150-+ SACRAMENTO, CALIFORNIA.95825 .• (91:6):568-2500 <br />