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ALTON <br /> GEOSCIENCE <br /> ' THE RESULTS TEAM <br /> August 5, 1992 <br /> i <br /> Mr. Steve Pao <br /> Field Engineer H <br /> Mobil Oil Corporation <br /> 3800 West Alameda Avenue, Suite 2000 <br /> Burbank, California 91505-4331 30-0136 <br /> Subject: Addendum to Supplemental Site Investigation Report <br /> Former Mobil Bulk Plant 04-343; Site Code 1968 <br /> 500 East Grantline Road <br /> Tracy, California <br /> Dear Mr. Pao: <br /> In accordance with the request of the San Joaquin_ County Public Health Services, <br /> Environmental Health Division (PHS/EHD) dated July 7, 1992, Alton Geoscience (Alton) <br /> herewith transmits the following recommendations as an addendum to the Supplemental Site <br /> Investigation Report by Alton (May 19, 1992): <br /> f • Continued quarterly ground water monitoring. <br /> • Continued remedial pump outs of ground water from Monitoring Wells AW-3 <br /> and AW-9. <br /> Please call if you have questions or comments. , <br /> Sincerely, <br /> ALTON GEOSCIENCE <br /> Stephan Rosen <br />�. Senior Geologist <br /> 5870 Stoneridge Drive,Suite 6 <br /> Pleasanton,California 94588 <br /> (510)734-8134-FAX{510)734-8420 <br />