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California 4egional Water Quality Control Board
<br /> Central Valley Region
<br /> ion
<br /> Katherine Hart, Chair ✓
<br /> Linda S.Adams Arnold
<br /> Secretary for Sacramento Main Office Schwarzenegger
<br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California 9 f� Governor
<br /> Protection Phone(916)464-3291 •FAX(916)464-4645 ���ii�D
<br /> http://www.waterboards.ca.gov/centralvalley v
<br /> 30 March 2010 MAR 3 1 2010
<br /> Mr. Timothy Kong Mr. Travis Bryant Mr.9OR I&MH
<br /> 1320 S. Van Buren St. Interstate Brands Corporation TemTIA
<br /> M! h of
<br /> Stockton, CA 95206 12 E. Armour Blvd. God ns�
<br /> Nil
<br /> Kansas City, MO 64111 3654 Iron Canyon Circle
<br /> Stockton, CA 95207
<br /> DIRECTIVE LETTER, CLEANUP AND ABATEMENT ORDER NO. R5-2007-0725,
<br /> DOLLY MADISON/LANGENDORF BAKERY, 1426 S. LINCOLN STREET, STOCKTON,
<br /> SAN JOAQUIN COUNTY, CALIFORNIA
<br /> I reviewed the Invoice and Budgeting Detail(Report) and Tables and Figures for the First Quarter 2010
<br /> Groundwater Monitoring Report (due 1 May 2010), each received 26 March 2010 as email attachments
<br /> and submitted by Mr. Kong's consultant Stratus Environmental, Inc. (Stratus) in response to a meeting
<br /> with Timothy Kong, and staffs of State Water Resources Control Board, this agency, and Stratus on
<br /> 25 March 2010. The Report provides cost estimates for six tasks to be conducted over the next
<br /> eighteen months, including line items for 1) weekly monitoring and maintenance of the SVE/AS
<br /> treatment system, 2) quarterly monitoring reports, 3) post-remediation groundwater remediation and
<br /> focused groundwater remediation (if deemed necessary), 4) post-remediation subsurface investigation,
<br /> 5) no further action report and public participation for site closure, and 6) well destruction and SVE/AS
<br /> treatment system decommissioning. The Tables and Figures provide the most recent monitoring data
<br /> collected from groundwater and the soil vapor extraction and air sparging (SVE/AS) treatment system.
<br /> The data show groundwater concentrations in the targeted remediation zone have declined up to two
<br /> orders of magnitude in monitoring well VW-1 for total petroleum hydrocarbons as gasoline (TPHg),
<br /> 1,800 micrograms per Liter (ug/L); benzene, 5.2 ug/L; toluene, 59 ug/L; ethylbenzene, 36 ug/L; and
<br /> xylenes, 330 ug/L; while SVE/AS treatment system influent vapor concentrations have declined two
<br /> orders of magnitude from startup in May 2009, down to TPHg, 18 milligrams per cubic meter.
<br /> I concur that the Report six tasks are necessary and appropriate to move the case towards closure. The
<br /> monitoring data indicates that a rebound test should be performed, to assess post-treatment
<br /> groundwater and soil vapor concentrations, and to determine the need for additional treatment. You are
<br /> to-cease-SVE/AS operations-immediately--and initiate a 4 month long-rebound test.(April —_July 2010)._
<br /> Further direction will follow in subsequent letters. For questions, please contact me at (916) 464-4615,
<br /> o y email at jbart n@waterboards.ca.gov.
<br /> tnAMESP.L. L. BARTON, G.
<br /> gineering Geologist
<br /> cc: Carmen Harms and Hari Patel, SWRCB UST Cleanup Fund, Sacramento
<br /> Nuel Henderson, San Joaquin County Environmental Health Department, Stockton
<br /> The Honorable Jerry W. Vetters, United States Bankruptcy Court, Western District of Missouri,
<br /> Western Division at Kansas City, Charles Evans Wittaker Courthouse, 400 E. 9th St., Kansas City,
<br /> MO 64106 (Case #04-45816)
<br /> Scott Bittinger, Stratus Environmental Inc., 3330 Cameron Park Dr., Ste. 550, Cameron Park
<br /> 95682
<br /> California Environmental Protection Agency
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