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California Regional Water Quality Control Board
<br /> Central Valley Region
<br /> ' Katherine Hart,Chair (&
<br /> 11020 Sun Center Drive,#200,Rancho Cordova,California 95670-6114
<br /> ' Matthew Rodriquez _ (916)464-3291 -FAX(916)464-4645 Edmm,d G.Brown Jr.
<br /> Seco elaryfor hdp://www.mterbmrds.ca,gov)ccntmlvailey Gm ernor
<br /> En vironmenlal Protection
<br /> ' 17 August 2011
<br /> Ms. Stephanie McKenna Mr. Jay Allen
<br /> ' Chevron Environmental Management Company Stone Brothers Management Company
<br /> 6001 Bollinger Canyon Road 5757 Pacific Avenue, Suite 220
<br /> San Ramon, CA 94583 Stockton, CA 95207
<br /> DOCUMENT REVIEW, MONTGOMERY WARDS AND UNOCAL STATION#5098, 5400-5606
<br /> ' PACIFIC AVENUE, STOCKTON, SAN JOAQUIN COUNTY, CASE NOS. 390258 AND 39001
<br /> 1 reviewed the Well Destruction Work Plan (Workplan), received 25 April 2011 and submitted by
<br /> Chevron's consultant AECOM. Additionally, two revised tables and a figure of the wells to be
<br /> destroyed was submitted by AECOM on 10 July 2011, The Workplan proposed the
<br /> decommissioning of eighty six monitoring wells (MW-1 through MW-7, MW-8D, MW-9R, MW-
<br /> 10, MW-10A, MW-11 through MW-14, MWA4A, MWA5R, MW-16 through MWA8, MWA8D,
<br /> MW-19S, MW-19D, MW-21S, MW-210, MW-22S, MW-22D, MW-23S, MW-23D, MW-24S,
<br /> MW-24D, MW-25S, MW-25D, and MW-27 through MW-32) and remediation wells (VEW-1 A,
<br /> ' VEW-2A, VEW-3 through VEW-5, VEW-6A through VEW-13A , VEW-1 B, VEW-2B, VEW-6B
<br /> through VEW-13B, VEW-16, VEW-19,VEW-22, SP-1A, SPA B, SP-2 through SP-6, SP-7A,
<br /> SP-7B, SP-8, AS-14 through AS-18, AS-20, AS-21, AS-26, AS-33 and SV-1 through SV-3) by
<br /> ' either pressure grouting (MW-2, MW-3, and MWA 1) or over-drilling, and the removal of the soil
<br /> vapor extraction/air sparging remediation system.
<br /> The Workplan is approved with the condition that all surfaces be restored to surrounding
<br /> ' conditions (asphalt, concrete, soil, etc.). Please provide myself and the San Joaquin County
<br /> Environmental Health Department at least three working days notice prior to commencement of
<br /> fieldwork,. For questions, please contact me at (916) 464-4615, or I can be reached by email at
<br /> jborton@waterboards.ca.gov.
<br /> E IED
<br /> �EC
<br /> GAMES L. L. BARTON, F .G.
<br /> Engineering Geologist LB
<br /> 8 2011
<br /> Enforcement Unit II OCON
<br /> cc: Judy Reid, SWRCB, UST Cleanup Fund (Commingled Plume Program), Sacramento
<br /> Mike Infurna, San Joaquin County Environmental Health Division, Stockton
<br /> Nichole Gleason, Downey Brand, 621 Capitol Mall, 18th Floor, Sacramento 95814
<br /> Breda Miller, AECOM, 1220 Avenida Acaso, Camarillo 93012
<br /> ' Jim Brake, Geocon Inc., 3160 Gold Valley Dr., Ste. 800, Rancho Cordova 95742
<br /> California Envirortntental Protection Agency
<br /> ' Qd Recycled Paper
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