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j Messrs Trommer and Nwm4on fir++ 16.lune 2008 Preliminary Five-Year Review Letters Page 4 of 7 Various Sites 1140 Hammer Lane, W. • The CUF has recommended review of the work plan to replace well MW-5 and evaluate additional remediation requirements; the EHD agrees with the recommendation, has reviewed the work plan and issued a permit for destruction of the current MW-5. The well will be reinstalled approximately 30 feet south of its current position. 103 E Street, N. • This site has been previously commented on by the EHD and the EHD agrees with the recommendation of the revised letter. 2537 Waterloo Road, E. • The CUF has recommended that the RP be directed to assess remedial technologies and implement active remediation without delay. The EHD has recently issued an approval for an interim corrective action pian and a work plan that incorporates a pump and treat system coupled with SVE/IAS; three additional monitoring wells are to be installed toward the west for additional plume delineation and two extraction wells are to be installed for remediation purposes. 290 Main Street N. • CUF recommends implementing the approved remedial technology; the EHD agrees. The discharge permit for treated water has been obtained, but the building permit has not been issued by the City of Manteca; it is estimated that an additional four weeks or so will be needed before construction is initiated. 545 Miner Street E. • CUF recommends closure consideration, the EHD cannot agree at this time. Recent vapor samples have exceeded the Tier 1 Surfer ESLs and soil data for TPHg, TPHd, naphthalene, benzene and xylenes exceed gross contamination; further evaluation of the data is needed. The EHD will direct the RP to demonstrate a relationship between the noted contamination and the UST system release and to evaluate potential remediation requirements. 595 11 th Street E. • The CUF recommended closure consideration, the EHD agrees with this recommendation. The vapor intrusion evaluation has been performed and reported to not be a significant concern, a closure summary report has been submitted and is pending EHD review. 1001 Yosemite Avenue E. • The CUF recommends site closure consideration, the EHD agrees with the recommendation. A soil vapor investigation has been conducted, but not yet reported; a site closure summary report has been submitted, but is pending EHD review. 5-Year Review Comment Letter 061508.doc