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California Reflonal Water Quality Control Board vCentral Valley Region Winston H.Hickox Robert Schneider,Chair Gray Davis Secretaryfor Sacramento Main Office Governor Environmental Internet Address: http://www.swrcb.ca.gov/mgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Phone(916)255-3000•FAX(916)255-3015 11 August 2003 Mr. Ralph Moran Atlantic Richfield Company 4 Centerpointe Drive La Palma, CA 90623-1066 REVIEW OF REVISED REMEDIAL ACTION PLAN,ARCOBP FUEL TERMINAL, PORT OF STOCKTON, SAN JOAQUIN COUNTY Staff of the Central Valley Regional Water Quality Control Board(Regional Board)have reviewed the 16 July 2003 Revised Remedial Action Plan (Revised Report) and the 31 July 2003 Contingency Plan Addendum (CP Addendum) submitted by URS Corporation(URS) on behalf of Atlantic Richfield Company(ARCO) for the ARCO/BP Stockton Fuel Terminal#0040 in Stockton(site). Prior to the Revised Report and CP Addendum, ARCO submitted the 21 April 2003 Remedial Action Plan (RAP) as Appendix B in the 28 April 2003 Corrective Action Plan (CAP) submitted by SECOR International Incorporated on behalf of the Stockton Terminals Technical Committee. Regional Board staff's 9 May 2003 letter stated that ARCO must submit the RAP separately instead of as an appendix to the CAP. On 5 June 2003, Regional Board staff met with you, ARCO and URS representatives to discuss the RAP. The Revised Report proposes to conduct a one-year sulfate and nitrate injection pilot study to evaluate the feasibility of this in-situ enhanced bioremediation technology. ARCO will inject a sulfate/nitrate/nitrogen/phosphorous solution continuously into three existing on site wells that are screened in the A water bearing zone for three months. The sulfate and nitrate will act as electron acceptors, and the nitrogen and phosphorous are to balance the nutrients in the subsurface to promote growth of microorganisms. ARCO has determined that the area of petroleum pollution is anaerobic and the addition of nitrate and sulfate will enhance the ability of the microorganisms to degrade the petroleum pollution under these conditions. The Revised Report proposes to sample nine downgradient wells and one upgradient well to monitor the effectiveness of the injection and evaluate whether concentrations of nitrate and sulfate increase above baseline concentrations, which will stop the pilot study. On 28 July 2003, Regional Board staff requested additional information regarding the contingency plan (CP) if the proposed injectants traveled further than estimated or were at concentrations that exceeded baseline concentrations. If these events occur, the CP Addendum California Environmental Protection Agency 0 Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at htip://www.swrcb.ca.gov/mgcb5