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Californ&egional Water Quality Con* Board <br /> Central Valley Region i t" <br /> i <br /> Karl E. Longley,Sc D, P.P,.,Chair <br /> Linda S. Adams <br /> Se" (Or Sacramento Main office Arnold <br /> 1.,mior..nenlal 11020 Sun Ccmcr lhrve 8200.Rancho Cordova.California 936766114 Schwarzrnegger <br /> !'raananr Phonc(916)464-3291 •FAx(916)464-4645 Cimernar <br /> 11I1P//www.wnterboenis.ca.govtccnlrlivalIcy <br /> 30 May 2008 <br /> Mr. Jeff Baker <br /> Tesoro Companies, Inc, <br /> 3450 South 3441h Way, Suite 100 <br /> Auburn, WA 98001-5931 <br /> WORK PLAN FOR ADDITIONAL MONITORING WELL INSTALLATION, STOCKTON <br /> TERMINALS TECHNICAL COMMITTEE FACILITIES, PORT OF STOCKTON, SAN JOAQUIN <br /> COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Regional Water Board) staff <br /> reviewed the 19 May 2008 Work Plan for Additional Monitoring Well Installation (Work Plan). <br /> SECOR International, Inc. (SECOR) submitted the document on behalf of the Stockton Terminals <br /> Technical Committee (STTC). STTC is comprised of three bulk fuel facilities at the Port of <br /> Stockton (Site) including British Petroleum (BP) (formerly ARCO), Tesoro Petroleum Company <br /> Inc. (Tesoro), and Time Oil Company. <br /> The principal contaminants of concern (COCs) at the Site include total petroleum hydrocarbons <br /> as gasoline (TPHg), TPH as diesel (TPHd), benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX), tertiary amyl methyl ether (TAME), methyl tertiary butyl ether (MTBE), and tertiary butyl <br /> alcohol (TBA). The STTC has utilized SoakeaseTM SPH removal socks in select wells since <br /> 20 September 2002 to remove separate phase hydrocarbons (SPH). In the Fall of 2004, the <br /> STTC began operation of two ozone sparge (OS) systems to clean up groundwater pollution <br /> migrating downgradient from the Site. The system is comprised of 57 A zone and 16 B zone <br /> wells connected to two 5 pounds-per-day (lbs/day) ozone generators. <br /> The STTC conducts monitoring at the Site pursuant to the requirements of Monitoring and <br /> Reporting Program (MRP) No. R5-2004-0823. SECOR conducted groundwater monitoring and <br /> sampling for the first quarter of 2008 between 4 and 7 February 2008. Sediments underlying the <br /> Site are subdivided into four progressively deeper hydrostratigraphic units referred to as the A <br /> Zone, B Zone, C Zone, and D Zone. During the first quarter, SECOR calculated that groundwater <br /> flow direction varied in the four zones. SECOR proposes resurveying monitoring well elevations <br /> to resolve the A and B zone localized water table mounding typically present at wells PS/WC-1 S <br /> and PS/WC-1M and the radial inward flow at wells SP/WC-1S and SP/WC-1 M. The historically <br /> predominantly downward vertical gradient between the four hydrostratigraphic units was neither <br /> consistently up nor down during the first quarter. <br /> The 1 May 2008 First Quarter 2008 Site Status, Groundwater Monitoring and Remedial Summary <br /> Report (First QMR) reports that SPH or SPH sheen was observed in six A zone wells, including <br /> five at Time Oil and one at Tesoro. Consistent with historical observations, no B, C, and D zone <br /> California Environmental Protection Agency C RccVcled Palm <br />