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California Regional Water Quality Control Board vCentral Valley Region Winston H.Hickox Robert Schneider,Chair Gra Davis Secreta n,f or 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 28 March 2001 Mr. Robert Donovan Tesoro Petroleum Companies 3450 344th Way, Suite 100 Auburn, WA 98001-5931 MONITORING AND REPORTING PROGRAM NO. 5-01-819 AND REVIEW QUARTERLY REPORT, STOCKTON TERMINALS TECHNICAL COMMITTEE, SAN JOAQUIN COUNTY We have reviewed the 31 January 2001 letter from Stephen Lofholm of IT Corporation(IT) for the Stockton Terminals Technical Committee (STTC) facilities in Stockton. The STTC is composed of ARCO Products, ST Services, Tesoro Petroleum Company, and Time Oil. The letter contains comments on the draft revised monitoring and reporting program(MRP), which we sent on 29 December 2000. STTC proposes to change the sampling frequency of monitoring well AR/MW-lA to semiannual, eliminate monitoring wells TS-1, TS-4, and TONT-8 from the MRP, list monitoring well TO/WC-IC as a C-zone monitoring well, list monitoring well TO/WC-lM as a B-zone monitoring well, analyze benzene, toluene, ethylbenzene, and total xylene (collectively BTEX), and total petroleum hydrocarbons as gasoline (TPHG)by EPA Method 826013, and that the MRP be re-evaluated in a year to adjust sampling frequency. We concur that monitoring wells TO/WC-lC and TO/WC-1M be listed as C-zone and B-zone monitoring wells, respectively, and that BTEX and TPHG be analyzed by EPA Method 826013. Monitoring well AR/MW-lA will remain quarterly to provide a control point for plume migration and for quarterly isoconcentration maps. Monitoring wells TS-I and TS-4 will remain in the MRP because of their screened interval and they are located in an area of high contaminant concentration where plume definition is needed. Monitoring well TO/T-8 will also remain in the MRP because it is in an area of high contaminant concentration. After the MRP has been implemented for a year, STTC may recommend changes. Enclosed is the final MRP No. 5-01-819, which should be implemented at the site during the second quarter 2001. In addition, we have reviewed the 31 January 2001 Fourth Quarter 2000 Groundwater Monitoring Report(Report) submitted by IT on behalf of the STTC. We have the following comments on this Report. 1. The Report does not include an explanation for the groundwater mounding in the A-zone. The Report should provide an explanation for this. California Environmental Protection Agency ped 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 http://www.swrcb.ca.9ov/rwgcb5