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fjT0ATE OF CALIFORNIA — ENbIRONMENTAL °*CTION AGENOY PETE WILSON. Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A <br /> SACRAMENTO. CA 95827.3098 <br /> F`HONE: 1916) 255-3000 <br /> PAX: 1916) 255-3015 <br /> RECEIVED <br /> MAY 12 1993 <br /> 10 May 1993 ENVIRONMENTAL HEALTH <br /> PERMIUSERYUS <br /> Mr. Charles B. Kolesar <br /> Shell Oil Company <br /> P. 0. Box 4848 <br /> 511 N. Brookhurst Street <br /> Anaheim, CA 92803 <br /> SITE INVESTIGATION UPDATE, SHELL OIL COMPANY, STOCKTON FUEL TERMINAL, SAN <br /> JOAQUIN COUNTY <br /> I have reviewed your 16 April 1993 letter updating the progress on the <br /> investigation at Shell Oil Company's Stockton Terminal and Harding Lawson <br /> Associates ' 8 April 1993 preliminary results of the plume characterization at <br /> the site. I have the following comments: <br /> 1. Your letter states that you are out of water storage at the facility <br /> since tanks 14 and 15 are full , the three extraction wells have been <br /> shut down, and you are evaluating water disposal options and actively <br /> pursuing issuance of your NPDES permit. <br /> You did not provide a time schedule for resuming ground water <br /> extraction. We are concerned that leaving the extraction wells turned <br /> off for a length of time could result in further migration of the <br /> contaminant plume which has been defined offsite to the east and south <br /> of the Shell property, but still needs definition to the west. <br /> We suggest that you consider disposing of the treated extracted ground <br /> water to the City of Stockton WWTP on an interim basis or trucking off <br /> freshly extracted ground water to your facility in Martinez. <br /> 2. The extent of the plume in the vicinity of hydropunch samples 26, 28, <br /> and 31 has not been defined. Further sampling is needed east and north <br /> of this area. Also, a monitoring well should be installed to establish <br /> the zero line of contamination and ascertain that BP Oil Company is not <br /> a source. <br /> 3. A time schedule is needed for submission of the final report on phases I <br /> and II of the hydropunch sampling program and a work plan for the phase <br /> III hydropunch sampling program additional well installation. <br />