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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> z 600 East Main Street <br /> Stockton California 95202-3029 PROGRAM COORDINATORS <br /> ' Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> C9��F RN`P Website: www.sJgov.org/ehd Linda FoleTurky, <br /> REHS RENS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> November 14, 2011 <br /> Mrs. Mei Teranishi <br /> 1600 Durham Ferry Road <br /> Tracy, California 95304-8799 <br /> Subject: Former George's Service <br /> 1600 Durham Ferry Road <br /> Tracy, California 95376 <br /> Dear Mrs. Teranishi: <br /> The San Joaquin County Environmental Health Department(EHD) has received and reviewed <br /> Remedial Action Work Plan (RAP), dated 30 June 2011, and Phase I Remedial Action <br /> Implementation Plan, dated 13 September 2011, both submitted by your consulting firm, <br /> Geological Technics, Inc. (GTI), on your behalf for the above referenced site. During a <br /> telephone conference call between Ray Kablanow, PG, of GTI and Nuel Henderson, PG, of <br /> the EHD on 29 August 2011, it was decided that in light of budgetary constraints, proposals <br /> presented in the RAP would be revised and implemented in phases. As a result, GTI <br /> submitted Phase I Remedial Action Implementation Plan that includes proposals to implement <br /> both a Phase I and Phase II plan and incorporates some of the original RAP. <br /> In Phase I, GTI proposes to: <br /> • Contact the California Regional Water Quality Control Board Central Valley Region <br /> (CRWQCBCVR) to determine the need to submit a permit for waste discharge <br /> requirements (WDR); <br /> • Perform groundwater sampling and monitoring for only wells SW-101 and MW-7 and <br /> only during the second quarter of each year and include measuring the depth-to-water <br /> in wells MW-5 and MW-8; <br /> • Assemble appropriate equipment for the air sparge system; <br /> • Inject air into existing wells OS-1, OS-2 and possibly MW-2; <br /> • Operate the air sparge system in bio-treatment mode by cyclically sparging OS-1 for <br /> fifteen minutes, followed by sparging OS-2 for fifteen minutes, then turning off the <br /> system for thirty minutes; <br /> • Monitor arsenic and hexavalent chromium concentrations in groundwater collected <br /> from wells OW-2, MW-2 and MW-106 prior to operating the air sparge system, and <br /> subsequently during the second and fourth quarters of 2012; <br /> • Measure dissolved oxygen (DO) levels monthly in wells OW-2, MW-2 and MW-106, <br /> and <br /> • Monitor the air sparge system monthly. <br />