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Messrs Larson and Trommer�v May 26, 2010 April and May 2010 Draft Five-Year Review Page 2 of 2 Recommendation Various Sites 1250 N. Wilson Way, Stockton, CA; Claim Number 13729: You concurred with the EHD approval of a groundwater extraction pilot study; we are in agreement. 1201 S. Center Street, Stockton, CA; Claim Number 12186: You concurred with the EHD that active remediation should continue at the site; we are in agreement. 2151 Country Club Boulevard, Stockton, CA; Claim Number 12962: You concurred with the EHD directive to conduct a dual phase extraction pilot test; we are in agreement. 11396 N. Highway 99, Stockton, CA; Claim Number 10934: You concurred with the EHD that active remediation should continue at the site; we are in agreement. The EHD has recently approved modifications to the vapor extraction system design that should accelerate the remediation process. 110 N. Filbert Street, Stockton, CA; Claim Number 2612: You concurred with the EHD directive to destroy monitoring wells to prepare for site closure; we are in agreement. At this time the work plan for well destructions has been approved and the permit applications have been received and will soon be issued. A closure letter will be issued following the well destructions and certification of proper disposal of the associated investigation derived wastes. 290 N. Main Street, Manteca, CA; Claim Number 13849: Noting that the rate of methyl tert- butyl ether (MTBE) extraction had declined and may have lost cost-effectiveness, you recommended that the EHD direct the RP to assess alternative remedial technologies. At this time the EHD is working with the consultant to identify and correct the problem with the groundwater extraction rate, which appears to be the cause for the low cost-effectiveness. Upon completion of the evaluation, the EHD will issue a directive to enhance the remediation effectiveness. 23569 S. Santa Fe Road, Escalon, CA; Claim Number 15211: You concurred with the EHD directive to resume groundwater monitoring and submission of the report of findings from the membrane interface probe (MIP) investigation. As noted to you in previous correspondence, there are serious communication problems with the RP at this time, but the EHD will pursue this issue as vigorously as possible to solution. Questions or comments should be directed to Mike Infurna at (209) 468-3454 or to Nuel Henderson at (209) 468-3436. Sincere Michael J. Infurna, JrVEH, Nuel Henderson, PG Senior Registered Environmental Engineering Geologist Health Specialist April and May 2010 Annual 5-year Reviews Mike's Sites.doc