SITE INFORMATION AND CORRESPONDENCE

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Wickland Oil #R603 page 2 6425 Pacific Ave., Stockton. In the very near future, large diameter groundwater extraction wells installed along the western edge of Pacific Avenue starting at 140 feet north of this site will begin to pull large amounts of groundwater from the first aquifer. PHS-EHD anticipates that this large scaled groundwater extraction process will have some effect on the plume size, direction of flow, petroleum concentration, and depth to groundwater at this site. The consultants for the Lincoln Property Solvent Plume investigation have advised PHS-EHD that the groundwater extraction procedures could start by October 1998. PHS-EHD recommends that prior to installing any new vapor wells on site, the effects of the groundwater extraction be evaluated by your consultant and discussed with Michael Infurna at PHS-EHD. In December 1997, the EPA Method 8260 analyses for groundwater samples from MW-2 was performed at elevated detection limits (10,000 ug/I for TBA, and 500 ug/I for the other four oxygenates) and reported as "non-detect". In order to accept conclusions that these constituents are not present in MW-2 (the most contaminated well on site), an additional 8260 analysis for groundwater samples from MW-2 are required at acceptable detection limits. Thank your for your cooperation throughout this long investigation. Please continue to submit your reports, work plans, and any comments you have to Michael Infurna, and you may call him at (209) 468-3454 if you wish to discuss the site or schedule the field inspections. Donna Heran, REHS, Director Environmental Health Division Michael J. Infurna Jr., Seennior-R`EHS Marg�rio R S LOP / Site Mitigation Unit IV Supervisor MI/ c: CVRWQCB - Mark List c: Western Geo-Engineers - George Converse, 1386 E. Beamer St., Woodland, 95776-6003. c: Lincoln Properties - Office of the General Counsel, 615 Lincoln Center, Stockton, 95207