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F <br /> r Wickland Oil #R603 page 2 <br /> 6425 Pacific Ave , Stockton <br /> In the very near future, large diameter groundwater extraction wells installed <br /> along the western edge of Pacific Avenue starting at 140 feet north of this site <br /> will begin to pull large amounts of groundwater from the first aquifer PHS-EHD <br /> anticipates that this large scaled groundwater extraction process will have some <br /> effect on the plume size, direction of flow, petroleum concentration, and depth to <br /> groundwater at this site The consultants for the Lincoln Property Solvent Plume <br /> investigation have advised PHS-EHD that the groundwater extraction procedures <br /> could start by October 1998 PHS-EHD recommends that prior to installing any <br /> new vapor wells on site, the effects of the groundwater extraction be evaluated <br /> by your consultant and discussed with Michael Infurna at PHS-EHD <br /> In December 1997, the EPA Method 8260 analyses for groundwater samples <br /> from MW-2 was performed at elevated detection limits (10,000 ug/I for TBA, and <br /> 500 ug/I for the other four oxygenates) and reported as "non-detect" In order to <br /> accept conclusions that these constituents are not present in MW-2 (the most <br /> contaminated well on site), an additional 8260 analysis for groundwater samples <br /> lie from MW-2 are required at acceptable detection limits <br /> Thank your for your cooperation throughout this long investigation Please <br /> continue to submit your reports, work plans, and any comments you have to <br /> Michael Infurna, and you may call him at (209) 468-3454 if you wish to discuss <br /> the site or schedule the field inspections <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Michael J Infurna Jr , Senior REHS Margaret Lagono, R S <br /> LOP 1 Site Mitigation Unit IV Supervisor <br /> R A1/ <br /> IVIII <br /> c �VRWQCB - Mark List <br /> c Western Geo-Engineers - George Converse, 1386 E Beamer St , <br /> Woodland, 95776-6003 <br /> c Lincoln Properties - Office of the General Counsel, 615 Lincoln Center, <br /> Stockton, 95207 <br />