SITE INFORMATION AND CORRESPONDENCE

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FROM 1997,05-15 12:29 #177 P.03/03 MAY: -15' 97(THU1 11: I? UNOCCERT NORTH RE TEL:51Cr7 :309 P. 003 Pursuant to Article 11 of the California Code of Regulations (CCR) Section 272-2. (b)(3) excavation and disposal of contaminated soil is considered an interim remedial action. Subsequent to the overexcavation you were directed to complete the assessment. Based on the results of the'assessment you were directed to perform a feasibility study. Your pilot VES system data partly fulfills CCR 2725 (f)(2) which states that the feasibility study shall evaluate two alternatives for restoring beneficial uses of groundwater. Once the assessment and the feasibility study are complete you may submit the Corrective Action Plan (CAP) CCR 2725. The CAP shall Include numerical objectives in the CVRWQCB basin plan, 1 ppb for benzene, to be used to establish target cleanup values to restore current or potential beneficial uses of water. The current PHSIEHD directive recommends that you perform a well surrey to complete your assessment and to evaluate natural attenuation, as a second a3temative, to complete your feasibility study. If the result of the feasibility study is that natural attenuation is the most cost effective alternative then that alternative should be recommended for Implementation in your CAP. Closure of this site as a low risk groundwater site may occur if site specific data I demonstrating natural attenuation (in addition to the stable and decllning trends in the monitoring wells) can be produced, and a rational to explain that natural attenuation will restore the beneficial use of the groundwater based on the basin plan. Closure of this sits is not appropriate at this time. For additional information please contact Steven.' Sasson at (209).48&3489. Donna Heran, REHS, Director Environmental Health Division n SteveInAO , tn �rEHS Marga Lagorio, HS Site Mitigation Unit Supervisor cc: Elizabeth Thayer, CVRWQCB 4 cc: James Brathovde, CVRWQCB If