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California Stop Page 2 of 2
<br /> 2224 Manthey Road May 10, 2013
<br /> Stockton, California 95206
<br /> • Perform a baseline monitoring event, prior to performing an in-situ ozone sparge (IOS)
<br /> pilot test, that includes taking depth-to-water measurements at each monitoring well,
<br /> and measuring geochemical parameters: pH, dissolved oxygen (DO), oxygen reduction
<br /> potential (ORP), salinity, total dissolved solids (TDS) and specific conductivity (SC) in
<br /> groundwater from monitoring wells MW-1, MW-2, MW-3, MW-5, MW-7 and MW-10;
<br /> • Install a Mako Industries ozone sparging system and complete a twenty-four-week pilot
<br /> study, injecting a maximum of three pounds per day of ozone simultaneously into
<br /> previously installed ozone injection wells OZ-1 and OZ-2;
<br /> • Monitor the ozone injection rate and frequencies weekly;
<br /> • Perform one groundwater monitoring event following the first month of operating the
<br /> IOS system, and during the third and sixth month of operating the IOS system; during
<br /> each monitoring event, depth-to-water will be measured at each monitoring well, and
<br /> groundwater samples and geometric parameters: pH, DO, ORP, salinity, TDS, and SC
<br /> will be collected from MW-1 through MW-3 and MW-7;
<br /> • Collect groundwater from the above-listed monitoring wells and analyze the samples
<br /> for: TPH-g, BTEX, anions and metals listed in the work plan, hexavalent chromium, pH,
<br /> conductivity, chemical oxygen demand, ammonia, alkalinity, TDS, dissolved iron and
<br /> dissolved manganese; and
<br /> • Submit a report of findings following the first month of operating the IOS and SVE
<br /> systems.
<br /> The EHD approves the work plan contingent upon your obtaining concurrence from the
<br /> California Regional Water Quality Control Board, Central Valley Region (CRWQCBCVR) to
<br /> proceed with the ozone feasibility pilot study. You must also get approval from the
<br /> CRWQCBCVR of Notice of Intent to comply with the terms of General Waste Discharge
<br /> Requirements, and the Monitoring and Reporting Program No. R5-2008-0149-010.
<br /> Also, when collecting vapor samples in Tedlar bags from the influent and effluent sampling
<br /> ports, store the Tedlar bags at room temperature instead of placing the Tedlar bags "in a chilled
<br /> container under ice."
<br /> On 10 May 2013, the EHD posted public notification of pending approval by this department of
<br /> the Remedial Action Work Plan to implement remediation at this site. The public has 30 days to
<br /> express concern regarding the pending remediation at this site. If none is received, fieldwork
<br /> may commence on 10 June 2013.
<br /> Please contact Vicki McCartney at (209) 468-9852 or by email at vmccartney ansjcehd com if
<br /> you have any questions concerning this letter.
<br /> Sincerely,
<br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG
<br /> Senior Registered Environmental Health Specialist Engineering Geologist
<br /> c: Mr. Timothy J. Cuellar, Advanced Geo Environmental, Inc., 837 Shaw Road, Stockton,
<br /> California 95215
<br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central
<br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670
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