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_ - _: .� <br /> Former Beneto Facility Page 2 of 2 <br /> 749 East Charter Way June 6, 2014 <br /> Stockton , California 95202 <br /> sixty-two feet bsg . When installed, the highest soil concentrations of benzene were detected in <br /> VW-1 , VW-3, and VW4 at thirty-five feet bsg , and AS-2 at forty-five feet bsg . If these wells are <br /> to be incorporated into the proposed SVE/AS system , the EHD recommends that first VW-1 , <br /> AS-2, VW-3 and VW-4 be monitored and sampled for contaminants of concern ; this will <br /> determine whether the wells should be redeveloped , and provide needed information <br /> concerning the effects on groundwater from operating an SVE system from 1997 through 2003 <br /> as well as performing a soil vapor extraction test in February 2007 using these wells . <br /> The EHD believes remediation efforts should focus on permanently reducing benzene to - <br /> concentrations below 1 , 000 pg/L in groundwater collected from MW-5 to comply with the LTCP <br /> criteria. Any proposal should focus remediation on benzene-impacted soil in the source area to <br /> reduce the flux rate to groundwater; proposed AS wells AS-3 , AS-4 and AS-5 are all outside the <br /> area of significant benzene impact to soil and are therefore not likely to effectively reduce the <br /> flux rate of benzene from soil to groundwater. Please submit a revised version of the FS-RAP <br /> proposal that specifically targets the core of benzene concentrations centered around MW-5. <br /> Submit the proposal to the EHD by 30 August 2014. <br /> If you have any questions, please contact Vicki McCartney at (209) 468-9852 or by e-mail at <br /> vmccartney@sjcehd.com . <br /> Sincerely, gyp( <br /> Victoria L. McCartney, REHS Nuel C. Henderson , Jr. , PG <br /> Senior Registered Environmental Hea Specialist Engineering Geologist <br /> c: Mr. Gregory George, PG , CEG , Apex Envirotech , Inc. , 11244 Pyrites Way, Gold River, <br /> California 95670 <br /> Ms . Cori Condon , PG , CHg , California Regional Water Quality Control Board Central <br /> Valley Region , 11020 Sun Center Drive, Suite 200, Rancho Cordova , California 95670 <br /> Mr. Muhammad Rizwan , 4917 Tiller Ct. , Stockton, California 95206 <br />