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3rn- _ �� � _ �_�a���,� -,r �s� •� ..r��,� ",k�w .a"�r. -��`a,:�- -'�.�_ - �-; �- �" - -� rr. �"``' - '_ - �"� r <br /> W� <br /> 1' <br /> d� <br /> Mr. Chua Cartnci <br /> July iS. t991 <br /> Prue i. <br /> Wscnzsion <br /> 'file genemi groundwater tlow direction and hydraulic gradient has not changed at this site since <br /> the previous groundwater monitoring (January 1991)• llowever, beneath the southwest comer <br /> of the site, tin: water-level elevations indicate in area or }tither water-level elevation that was <br /> first present during the January 1991 sampling event. Nater-level elevations increased an <br /> average of 0.18 feet in all monitoring wells. <br /> wells ATR-3 and A'lRA showed no change or insignificant <br /> All tltc monitoring wells, except art <br /> changes in B= aid TPH while ATR-5 showed a decrease in l3M, but ` <br /> centrations TPH con t an increase ain TPH <br /> increase in benzene and <br /> concentrations, <br /> if you have any questions, please contact me or Mr. Steve Nlisner at (916) 444-0123. <br /> Very truly yours. <br /> BRONVN CALDWE .t .. <br /> lalyucas, R.G. <br /> Project Manager e tc1;6 i* J <br /> L:7AH:rrzlsw <br /> J r^1 �cr cr <br /> Enclosures <br /> cc: Mr. Gcrdon Boggs, California Regional Water Qnality Control Board. <br /> Central Valley Region <br /> Mr. Harlin Knoll,San Joaquin County Local Health District <br /> Mr. Steve Misner, Brown and Caldwell <br /> Mr. Cluis Winsor,, ARCO Products Company <br /> Brown anti Caldwell <br />