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California&gional Water Quality Col Board -` <br /> r <br /> Central Valley Region f z_ <br /> Karl E.Longley,ScD, P.E.,Chair <br /> Linda S. Adams Arnold <br /> S'ecrerarl for Sacramento Main Office Sehwarzene <br /> Pmv omm val 11020 San Center Drive 4200.Rancho Cordova.California 95670-6114 gger <br /> P, Phone(916)464-3291 •FAX(91 jt) vev ��� ❑� D Gorernor <br /> htip:i/wirw.e'aterboardsca.@ov/ —y v \\\/// <br /> 1 February 2008 FEB - 5 2008 <br /> ENVIRONMENT HEALTH <br /> Mr. Denis Brown PERMIT/SERVICES <br /> Shell Oil Products <br /> 20945 Wilmington Ave. <br /> Carson CA 90810 <br /> Mr. John Kendrick <br /> 3011 W. Benjamin Holt Drive <br /> Stockton CA 95219 <br /> DOCUMENT REVIEW, SHELL STATION NO. 204-7524-4404, 3011 W. BENJAMIN HOLT <br /> DRIVE, STOCKTON, SAN JOAQUIN COUNTY (REGIONAL BOARD CASE # 390557) <br /> 1 reviewed the Fate and Transport Model (Model), received 31 December 2007 and submitted <br /> by your consultant Conestoga-Rovers & Associates (C-R&A). In the 24 January 2007 <br /> Regional Board staff letter, you were notified of a change of regulatory lead agency from the <br /> San Joaquin County Environmental Health Department to this agency, and directed to submit <br /> a workplan to delineate the vertical and lateral extent of the petroleum hydrocarbon release to <br /> soil and groundwater. During a subsequent conference call on 26 April 2007, C-R&A and <br /> Regional Board staff agreed to conduct a modeling exercise with existing data for the <br /> groundwater plume, and suspend the request for a workplan. The methyl tert-butyl ether <br /> (MTBE) groundwater plume has migrated offsite to the northeast underneath Interstate 5 (1-5), <br /> complicating further investigation. <br /> The Model uses a two dimensional Microsoft Excel spreadsheet-based program for <br /> groundwater (US Environmental Protection Agency Bioscreen version 1.4) to screen the fate <br /> (how much time will the plume persist) and transport (how far the plume will migrate) of the <br /> MTBE plume. The Model evaluated two separate site data sets for a target final MTBE <br /> concentration of 5 micrograms per Liter (ug/L), the Regional Board Water Quality Goal (WQG) <br /> for Taste and Odor Threshold, and to determine the MTBE concentrations and plume length. <br /> The MTBE data sets are: <br /> 1 . The second quarter 2007 (2Q2007) maximum for that quarter monitoring datum <br /> (25 ug/L), which was run to the year 2017, and <br /> 2. The second quarter 1997 (2Q1997) maximum site monitoring datum (29,000 ug/L), <br /> which was run to the year 2042. <br /> California Environmental Protection Agency <br /> C5 Recycled Paper <br />