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RECEVtu"961,.-0-- <br /> -Mobill-.011' Corp-bratibn <br /> SEP 2 5 199 <br /> 3800 WEST ALAMEDA AVENUE <br /> ENVIRONMENTAL HEALTHBURBANK,CALIFORNIA 91W&4331 <br /> !tl9f EPIERMIT�!�� YR4k IUS <br /> September 22 , 1992 #�i <br /> Ms. Mary Meays FORMER ,,MOBIL BULK PLANT <br /> San Joaquin County 500 .EAST:GitANTLINE ROAD <br /> Environmental ,`Health Division TRACY, CALIFORNIA <br /> 1601 .East -Hazelton Ave, <br /> Stockton, CA 95201 <br /> Dear Ms. Meays: <br /> Enclosed "for your information is the quarterly monitoring <br /> and sampling report dated August 27 , 1992 for subject <br /> location.. The .average, depth, to ground water -was 1.0. 91 feet, <br /> with hydraulic gradient of -'0. 012 foot per foot. The ground <br /> water- gradient direction and magnitude have remained <br /> relatively consistently to the northeast. <br /> TPHG and BTEX were not detected in any of the wells except <br /> benzene -in AW-9 (0. 74ppb) . TPHD was present only in AW-3 and <br /> AW-8 (870 ppb . and 63 ppb) . The presence of TPHD in AW-8 is <br /> not considered related to the former Mobil Bulk Plant. <br /> It appears that concentrations of. hydrocar"bons were reduced <br /> in AW-3 and AW--'9 as a results of interim remediation. <br /> If .you have any questions, Please feel free to call me at- - <br /> (818) = 53-2626 <br /> t(818) =953-2626 <br /> Sincerely, <br /> Stephen .Pao <br /> Field Engineer II <br /> enclosure <br /> cc: Ms. Elizabeth Thayer (w/ enclosure) <br /> "RW.QCB-- Central Valley Region <br /> 3 4 4 3 .Rout i-er. Road <br /> Sacramento, CA 95827 <br /> I <br /> Mr. ' Greg. Schubert (w;/ :enclosure) <br /> F Mark TIS Engineering Contractors <br /> 5101 Florin Perkins Road It <br /> Sacramento; CA 95826 <br /> Environmental <br /> Awareness <br />