Laserfiche WebLink
San Joaquin County DIRECTOR <br /> PoW H Donna Heran, REHS <br /> �O. �..C� Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> ����� Stockton, California 95202-3029 <br /> � I_ISSt1Y:. ,�- :� PROGRAM COORDINATORS <br /> ' ---- -- - --- ---- Cad Borgman,REHS <br /> Mike Huggins,REHS,RDI <br /> Website: www.s ov.or /ehd <br /> 9Ci F od� 19 9 Margaret Lagorio,REHS <br /> Phone: (209) 468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS, RDI <br /> Kasey Foley,REHS <br /> 16 October 2008 <br /> George and Mei Teranishi <br /> 1600 Durham Ferry Road <br /> Tracy CA 95376 <br /> Subject: Former Georges Service <br /> 1600 Durham Ferry Road <br /> Tracy CA 95376 <br /> San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Re: Remedial Action Plan, Soil Vapor Extraction and Oxygen Releasing <br /> Compound (ReRAP1), dated 15 July 2008, Re: Remedial Action Plan, Soil Vapor <br /> Extraction and Oxygen Releasing Compound (ReRAP2), dated 13 August 2008, <br /> Revision — Groundwater Monitoring Schedule (GWMS), dated 09 September 2008 and <br /> Work Plan — Geoprobe Site Investigation (WP), dated 18 September 2008, all prepared <br /> on your behalf by your consultant Geological Technics, Inc. (GTI). <br /> In ReRAP1, your consultant proposed to operate the soil vapor extraction system for two <br /> to four 8-hour periods and to collect as many as two vapor samples during each 8-hour <br /> test run for laboratory analysis; the purpose of the proposed work is to obtain data to <br /> design the air (extracted vapor) treatment portion of the soil vapor extraction system. It <br /> was proposed to analyze the soil vapor samples by: <br /> • EPA Method TO-3 for total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g) and benzene, toluene, ethylbenzene and total xylenes; and by <br /> • EPA method TO-14 for the five fuel oxygenates, 1,2-dichloroethane, and <br /> ethylene dibromide. <br /> The EHD has been informed that the latter analytical method should be TO-14A. With <br /> the provision that the proper analytical methods be utilized for the potential chemicals of <br /> concern, the EHD approves the proposed scope of work in ReRAP1 as necessary and <br /> adequate [Health & Safety Code (H&S) Section 25299.37(c)(3)]. To better evaluate the <br /> system response to these short test runs, the EHD recommends that PID readings be <br /> taken hourly during each test. <br /> In ReRAP2, GTI responded to the EHD inquiry regarding the potential effect on aquifer <br /> porosity and permeability if ORC Advanced were to be injected into the proposed 45 <br /> borings to stimulate biological activity; GTI also provided the design details for a 2-week <br /> soil vapor extraction (SVE) and insitu air sparging (IAS) pilot test. GTI provided <br /> information on the ORC Advanced that addressed the EHD concern, but the injection <br /> pattern design was not satisfactorily explained; the EHD wishes to be assured that the <br /> ORC Advanced will be distributed to maximize its impact on the contaminant mass in <br /> groundwater. GTI determined more assessment is required to achieve such optimization <br /> WP Approval Letter 101608.doc <br />