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' FROM 1997 05-15 12 28 #177 P 03/03 <br /> MAY -15' 97(THU) 12' 12 UNOCAL CERT VVY RE TRG SID 2117 2309 <br /> P. 003 <br /> 1 <br /> Pursuant to Article 11 of the Califomia Cade of Regulations (CCR) Section 2722 <br /> (b)(3) excavation and disposal of contaminated soil is considered an interim <br /> rernedral action. Subsequent to the overexcavation you were directed to complete <br /> the assessment. Based on the results of the assessment you were directed to <br /> Perform a feasibility study. Your pilot VES system data partly fulfills CCR 2725 <br />' (0(2) which states that the feasibility study shall evaluate two alternatives for <br /> restoring beneficial uses of groundwater. Once the assessment and the feasibility <br /> study are complete you may submit the Corrective Action Pian (CAP) CCR 2728, <br /> The CAP shall Include numerical objectives in the CVRVVQca basin plan, 1 ppb <br /> for benzene, try be used to establish target cleanup values to restore current or <br />' potential beneficial uses of water <br /> The current PHSIEHD directive recommends that you perform a well survey to <br />' complete your assessment and to evaluate natural attenuation, as a second <br /> Ohemative, to complete your feasibility study, If the result of the feasibility study is <br /> that natural attenuation is the mast cost effective alternative then that alternative <br />' should be recommended for Implementation in your CAP. <br /> Closure of this site as a low risk groundwater site may occur if site specific data <br /> demonstrating natural attenuation (in addition to the ratable and declining trends in <br /> the monitoring wells) can be produced, and a ratlanai to explain that natural <br /> attenuation will restore the beneficial use of the groundwater based on the basin <br />' plan Closure of this Site is not appropriate at this time. <br /> For additional Information please contact Steven Sasson at (209) 468-3459, <br /> Danns Heran, RENS, Director <br />' Environmental Health Division <br /> iS <br /> n a ,#e ®raEHS Marga gorio, H5 <br /> Site Mitigation Unit Supervisor <br /> cc Elizabeth Thayer, CVRWQC13 <br /> cc, .lames Brathovde, CVRWQCg <br /> I <br /> I ' <br />