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Steve&Gene's Service Page 2 of 2 <br /> 2315 N. EI Dorado Street May 19,2009 <br /> Stockton,CA <br /> i <br /> (lbs) averaging 0.0557 lbs.per day, and the total groundwater extraction mass removed <br /> was 0.12 gallons (0.72 lbs). GTI proposes'to continue operating the remediation system <br /> in "pulse mode". GTI indicated that the remediation system was shut off on March 26`h <br /> and will resume in approximately two weeks to sample for TPH-g influent concentrations. <br /> GTI proposed that if the TPH-g influent concentrations do not increase, then other <br /> remediation alternatives will be evaluated. The EHD believes that the existing <br /> remediation system is not effectively removing contaminants and an evaluation should <br /> be done to improve its effectiveness. If the existing remediation system is not cost <br /> effective, then potentially more cost effective technologies will need to be evaluated. <br /> In the QR, GTI recommended a reduction of ground water sampling frequency in <br /> selected monitoring wells. The EHD concurs with GTI's recommendation and directs that <br /> the frequency of sampling be reduced as follows: MW=7, MW-9, MW-107; .MW-101; <br /> MW-109, MW-207-,• and MW-209 to annual; MW-1 through MW-6, MW-8, MW-108, <br /> MW109, MW-307, MW-308, and MW-309 to semi-annual. <br /> If you have any questions, please contact Frank Girardi at (209) 953-7868. <br /> ✓" � ��Grp <br /> Frank Girardi, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton—CVRWQCB,11020 Sun Center Dr. #200, Rancho Cordova, CA 95670 <br /> Ray Kablanow, PG —Geological Technics Inc., 1101 Seventh St., Modesto, CA 95354 <br /> i <br /> I <br />