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st' <br /> Thrifty Oil Company#171 page 3 <br /> 1250 N. Wilson Way, Stockton. <br /> Once TOC has evaluated GWE against other feasible remedial alternatives with regard <br /> to costs and duration of system operation, EHD will review your findings and comment. <br /> If TOC can justify that GWE is the most cost-effective and feasible modification to <br /> reducing the petroleum impact to the groundwater at this site, EHD will gladly approve <br /> its implementation. <br /> As a suggestion, TOC may want to consider air sparging or ozone sparging as a <br /> remedial action and groundwater extraction as an interim remedial action pending <br /> additional assessment. <br /> In closing, EHD would like to bring to your attention that the CVRWQCB is requiring <br /> groundwater analysis for 1,2-dichloroethane (1,2-DCA). Please include this analyte into <br /> your quarterly monitoring requirement for all wells under this sites' responsibility. EPA <br /> Method 82608 is acceptable for this constituent and a detection limit of 0.5 µg11 is <br /> required. If undetected in groundwater samples for two consecutive quarters, <br /> eliminating the analyte from the analytical program will be granted if requested. <br /> Thank you for your continued interest and cooperation in monitoring and evaluating your <br /> remedial efforts at this site. Please continue to address your submittals to Michael <br /> Infurna and you may either phone him at (209) 468-3454, or contact him by electronic <br /> mail at minfurna@sjcehd.com. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> 4J,_�k V_Z�_/q <br /> r� <br /> Michael J. Infurna Jr., Senior REHS Nuel C. Henderson Jr. RG <br /> LOP 1 Site Mitigation Unit IV LOP 1 Site Mitigation Unit IV <br /> Ml/ <br /> c: CVRWQCB— Marty Hartzell, Sacramento. <br /> c: SWRCB-CUF — Marc Owens, Sacramento. <br /> c: HydroGeo Consultants — Richard Vogl CHG, 3151 Airway Ave, <br /> Bldg H1, Costa Mesa, CA. 92626 <br />