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UIN <br /> PUBSEi&ic' E' sC HEALTH <br /> 3 <br /> SAN JOAQUIN COUNTY _ <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer �• `P. <br /> P.O. Box 2009 • (1601 East Hazelron Avenue) Stockton,California 95201 <br /> (209) 468-3400 <br /> FEB 7 ?�9i <br /> Mark P. Ausburn <br /> Senior Staff Hydrogeologist Fly <br /> Mobil Oil Corporation <br /> 3800 W. Alameda Avenue - Ste 700 <br /> Burbank, CA 91505-4331 <br /> RE: FORMER MOBIL BULK PLANT SITE CODE: 1968 <br /> 500 E. GRANT LINE ROAD; TRACY <br /> We are in receipt of your Soil Excavation and Preliminary Groundwater <br /> Investigative Report as well as your proposed Work Plan for Additional Site <br /> Investigation for the above site. <br /> Pursuant to your recent telephone conversation with a member of my staff, we <br /> will be unable to promptly review and provide comments on the Report. However, <br /> we do not have objections to continued field investigation in order to better <br /> define the extent of the contamination problem. <br /> The additional investigative field work, identified as Part 1-Supplemental <br /> Subsurface Investigation in the-Proposed Scope of Work, shall be submitted to our <br /> office and the Central Valley Regional Water Quality Control Board entitled the <br /> Problem Assessment Report no later than..April 25, 1991. <br /> The portion of the work Plan entitled Part 2-Groundwater Monitoring and Sampling <br /> should follow Section 2652(d) of the Underground Storage Tank Regulations (CAC, <br /> Title 23, Subchapter 16) for quarterly monitoring requirements and, is to show <br /> the: <br /> -status of investigation and cleanup activities including the <br /> results of all investigations completed to <br /> date; <br /> -proposed continuing or next phase of investigation; <br /> -method of cleanup proposed orimplemented, <br /> schedules for the completion of the <br /> investigationoof the site and remediation; <br /> -monitoring well data including groundwater <br /> elevation, pH;conductivity,gradi.ent; <br /> -analytical results of groundwater or. soil sampling; <br /> and <br /> --a site map showing:= the "zero line" of contamination, if known, <br /> and changes in the above measurements over <br /> the last quarter. <br /> Reference: Appendix A, Tri-Regional Recommendations, '10 August 1990. <br /> A Division of San,joaquin County Health Care Services <br />