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PUBhfC HEALTH SEIVICES �oA�.ro <br /> •G <br /> SAN JOAQUIN COUNTY t` : <br /> BOG] K11ANNA h1.D.,M.P.11. <br /> I-lealtli Officer <br /> 11.0. [lox 2009 • (1601 East flazelton Avenue) a Stockton, California 95201 ;i;gi65 <br /> (209) 468.34(x) <br /> SSP 12 1991 <br /> lJ , <br /> CHEVRON U S A <br /> a- <br /> 2410 CAMINO RAMON <br /> SAN RAMON CA 94583 <br /> RE: Chevron U.S.A. Station IN REPLY REFER TO SITE CODE: 18971 j <br /> 575 W. Grant Line Rd. <br /> Tracy, CA <br /> The former Mobil Service Station 4110-NP4 at 2375 N. Tracy Blvd.,Tracy, CA, has conducted a groundwater <br /> investigation associated with an unauthorized release documented in 1986. A number of groundwater <br /> i <br /> monitoring wells have been completed on-site and off-site in order to determine the full extent of <br /> contamination, but zero lines have not been defined. <br /> In a report prepared by Mobil's consultant, Alton Geoscience, Inc. stated, "Based on the hydrogeologic <br /> conditions in the area and results of the field activities and laboratory analyses, there are potentially three <br /> (3) hydrocarbon contaminant plumes in the vicinity of the site that have co-mingled: one on-site on the <br /> northeast corner of the former Mobil property; one adjacent to the Exxon property; and one adjacent to the <br /> Chevron property." <br /> In order to fully define the extent of the groundwater contamination in the area, this office is continuing <br /> to seek the cooperation of the involved parties to characterize each contamination plume. PIease submit a <br /> Preliminary Report (PR) for 574 W. Grant Line Road, Tracy, CA, by November 1, 1991. <br /> If you have any further questions regarding this matter, contact Harlin Knoll, RENS, at (209)466-3442. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health Offi <br /> ' I <br /> ti�ie A. Cotu)la, RENS, Program Manager <br /> environmental Health Division <br /> [.AC/1-iK:nr <br /> c: CVRWQCB - Elizabeth Thayer <br /> c: Mobil Oil Corp. - David M. Noe <br /> 3800 W. Alameda Ave. Ste. 700; Burbank, CA 91505-4331 1 <br /> c: B. P. Oil Company - Peter DeSantis <br /> 2868 Prospect Park Drive, Ste. 360; <br /> Rancho Cordova, CA 95670-6020 <br /> c: Alton Geoscience - A) Sevilla <br /> 1000 Burnette Ave., Ste. 140, Concord, CA 94520 <br /> bc: Evelyn Costa, Board of Supervisors <br /> San Joaquin County I <br /> A Dhisian of San J+nagnin(;aunty Ilcaith care services �� + <br /> 1 <br />