Laserfiche WebLink
Former George's Service Page 3 of 3 <br /> 1600 Durham Ferry Road December 1, 2014 <br /> Tracy, California 95376 <br /> The EHD comments on the current sampling schedule and numbered items as follows: <br /> • EHD approves quarterly performance monitoring of MW-1, MW-2, MW-7, MW-101, <br /> OW-1 and OW-2 through the third quarter 2015; <br /> • EHD approves the analyses of TPHg, BTEX, MTBE, and 1,2-DCA for groundwater <br /> samples collected quarterly through the third quarter 2015; <br /> • EHD directs that MW-8, MW-102 and OW-2 be omitted from the list of wells being <br /> sampled and having depth-to-water measurements collected through the third quarter <br /> 2015; <br /> • EHD approves Ground Zero's proposals numbered above except for proposal number <br /> eight; the EHD will not approve future performance monitoring, groundwater sampling <br /> and monitoring beyond the one-year pilot study which the EHD believes began when soil <br /> vapor extraction wells VEW-3 through VEW-6 were installed on-site in October 2014. <br /> Future monitoring requirements will be based on evaluation of findings to date at that <br /> time. <br /> Include estimates of mass removal in the semi-annual groundwater monitoring and treatment <br /> system effectiveness reports; if the mass removal ratios are low provide technical justification <br /> for continued operation of the remediation system. Once the EHD has received the report of <br /> findings from installing the four soil vapor extraction wells (VEW3 through VEW6) and <br /> advancing the three soil borings in October 2014, and has received and reviewed results from <br /> completing the one-year pilot study, the EHD will assess the need to submit a corrective action <br /> plan and continue groundwater monitoring. <br /> Please contact Vicki McCartney at (209) 468-9852 or by e-mail at vmccartney(o),sicehd.com if <br /> you have any questions or comments. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health pecialist Engineering Geologist <br /> c: Mr. Eric L. Price, PG, Ground Zero Analysis, Inc., 1172 Kansas Avenue, Modesto, <br /> California 95351-1526 <br /> Mr. James Barton, PG, California Regional Water Quality Control Board Central Valley <br /> Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />