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Canepa's Car Wash page 2 <br /> 248 E. Park Street July 8, 2011 <br /> The EHD has reviewed the groundwater data from the site and has concluded that <br /> MW-5, which is located down gradient (northeast) of the core area; represents a <br /> groundwater concern at the site that the RAWP is not addressing. The groundwater <br /> data from this well shows a rise in dissolved concentrations of petroleum hydrocarbons <br /> over time. It appears that the groundwater plume is continuing to migrate from the core <br /> area towards MW-5. With no remediation proposed in the area of MW-5, the EHD is <br /> concerned that significantly contaminated and untreated groundwater will continue to <br /> migrate off-site. The EHD has researched the soil data in the area of MW-5 and has <br /> concluded no significant soil contamination is present. Without soil contamination, the <br /> EHD has concluded that an additional DPE remediation well in this area would not be <br /> the most effective method to treat the groundwater at MW-5, but is of the opinion that <br /> some remedial effort is needed here. <br /> Please evaluate and propose a remedial alternative to treat the groundwater in the area <br /> around MW-5 while addressing the areas of known soil and groundwater contamination <br /> through DPE and submit your proposal in an Interim Remediation Action Work Plan <br /> (TRAP) due on Geotracker within 60 days. The IRAP is also to include a work plan to <br /> continue the required groundwater plume delineation investigation. <br /> You may contact Michael Infurna at (209) 468-3454 if you have any questions. <br /> Michael J. Infurna Jr., REHS Nuel C. Henderson Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. James L. Barton, CVRWQCB <br /> Mr. Kirk Larsen, SWRCB-CUF <br /> Mr. William Little, AGE., 837 Shaw Rd., Stockton, CA 95215 <br /> 248 Park DPE Pilot Report CML 7-8-11.doc <br />