Laserfiche WebLink
California F ,ional Water Quality Contr ' Board <br /> L_�%' Central Valley Region <br /> Karl E. Longley,ScD, P.E., Chair <br /> �:. <br /> Linda S. Adams Arnold <br /> 5ecrerart for Sacramento Main Office Schwarzenegger <br /> F171,11-onmemal 11020 Sun Center Drive#300.Rancho Cordova.California 95670-6114 Governor <br /> Prorecnon Phone(916)464-3291 •F.a.N(916)464-4645 <br /> http//w\cw waterboards ca gov/centrale ev <br /> NOV 1 gUi1l <br /> 16 November 2007 <br /> E1YV1RONME,�!,T�� ILFH <br /> pERMl1/ScRVii,ES <br /> Ms. Shelby Lathrop <br /> ConocoPhillips Company <br /> 76 Broadway <br /> Sacramento, CA 95818 <br /> ADDENDUM WORK PLAN FOR OXYGEN INJECTION PILOT TESTING, FORMER TOSCO <br /> BULK TERMINAL #10013, 3505 NAVY DRIVE, STOCKTON, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) staff reviewed the 15 October 2007 Addendum Work Plan for Oxygen Injection Pilot <br /> Testing (Addendum) submitted by SECOR International Incorporated (SECOR) on behalf of <br /> the ConocoPhillips Company (ConocoPhillips) for the former Tosco bulk fuel terminal site at <br /> 3505 Navy Drive in Stockton, San Joaquin County (Site). ConocoPhilips conducts <br /> groundwater monitoring at the Site pursuant to Monitoring and Reporting Program (MRP) No. <br /> R5-2004-0824. <br /> In the 4 April 2006 Work Plan for Oxygen Injection Pilot Test, Former Tosco Bulk Terminal No. <br /> 10013 (Work Plan), ConocoPhillips proposed conducting the oxygen injection pilot test (Pilot <br /> Study) utilizing an injection well network in the source area of groundwater pollution at the <br /> Site. On 6 July 2007, ConocoPhillips' former consultant EarthTech notified Regional Water <br /> Board staff by email that they had completed installation of 12 injection wells for the Pilot <br /> Study. Regional Water Board staff requested additional information including baseline <br /> groundwater data prior to performing the Pilot Study. On 9 October 2007 Mr. Sean Coyle of <br /> SECOR, informed Regional Water Board staff that they had replaced EarthTech as <br /> environmental consultants for the Site. SECOR submitted the Addendum to address the <br /> comments in our 25 July 2007 letter on the proposed pilot test. <br /> EarthTech describes the hydrostratigraphy underlying the Site as consisting of three <br /> progressively deeper layers called the A, B, and C zones. The A-zone occurs a depths of <br /> about 12 to 25 feet below ground surface (bgs), the B-zone from 30 to 50 feet bgs, and the C- <br /> zone from 55 to 75 feet bgs. ConocoPhillips conducted groundwater monitoring for the third <br /> quarter on 27 August 2007. In the 1 October 2007 Third Quarter 2007 Groundwater Monitoring <br /> Report (Third QMR) the groundwater gradient and flow direction in the three zones were <br /> calculated to range from 0.001 feet per foot (ft/ft) to 0.003 ft/ft in a southwesterly direction. <br /> Constituents of concern (COCs) at this Site presently include total petroleum hydrocarbons as <br /> diesel (TPHd), tertiary butyl alcohol (TBA), and methyl tertiary butyl ether (MTBE). Other <br /> COCs have included benzene, toluene, ethyl benzene, and xylenes (BTEX), TPH as gasoline <br /> California Environmental Protection Agency <br /> p�a Kec_vcled Paper <br />