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i <br /> j <br /> i <br /> Pat O'Rorke <br /> Page 2 <br /> Underground Storage Tank Regulations (Article 11). Since the vertical and lateral <br /> extent of soil and groundwater contamination have not been defined, and feasibility <br /> studies have not been conducted to evaluate costs of cleanup alternatives, this <br /> provision cannot be met. <br /> If soil excavation to approximately 20 feet bgs was performed as proposed in the WP, <br /> the contaminated soil identified at 40.feet bgs (8170 PPM TPH-GAS) would not be <br /> remediated. Therefore, PHS/EHD is directing you to define the lateral and vertical <br /> extent of soil and groundwater contamination, and conduct feasibility studies to <br /> determine the most cost effective alternative to remediate this site. <br /> After the site contamination has been defined, and the feasibility studies have been <br /> conducted, a Corrective Action Plan must be submitted to PHS/EHD. <br /> If you have any further questions regarding this matter, please contact Harlin Knoll at <br /> (209) 468-3442. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Harlin Knoll, Senior REHS Margat Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> i <br /> HK:lb <br /> c: RWQCB, Central Valley Region - Pat Anderson <br /> West134 <br /> I <br />