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California Regional Water Quality Control Board Central Valley Region 2005 SEP 23 PH 12: 32 Robert Schneider Chair Alan C.Lloyd,Ph.D. Secretaryfor Sacramento Main Office `" ' u E14iYl:{VI{i-1;:IaTAL Arnold Environmental 11020 Sun Center Drive#200,Rancho Cordova,Cal ifomia 95670-6�1E4,nI L T H D E P::P T M E N T Schwarzeneggei Protection Phone(916)464-3291 •FAX(916)464-4645 Governor http://www.waterboards.ca.gov/centralval ley 21 September 2005 Mr. Mel Rice Mel Rice Terminals P.O. Box 680 Lockeford, CA 95237-0658 REQUEST FOR INVESTIGATION,MEL RICE TERMINAL, PORT OF STOCKTON, SAN JOA QUIN COUNTY The Mel Rice Terminal at the Port of Stockton houses seven above-ground tanks that have contained bulk liquid fertilizer products for a number of years. A Phase II investigation was conducted in May 2004 by Kleinfelder Inc., as reported in Limited Soil and Groundwater Assessment, Mel Rice Terminal dated 9 February 2005. The soil data show that ammonium and nitrate are both present in concentrations up to 14,000 mg/kg and 18,000 mg/kg, respectively, at a depth of five feet below ground surface (bgs). Groundwater is encountered at about six feet bgs and contains as much as 24,000 mg/l ammonium and 15,000 mg/1 nitrate. The water quality objective for ammonium in groundwater is 1.5 mg/1 and for nitrate (as nitrogen) is 10 mg/l. The distribution of the pollutants in soil and groundwater appear to be centered beneath the above-ground tanks. By 4 November 2005, please provide a schedule for a work plan to delineate the extent of pollutants in soil and groundwater. The lateral and vertical extent of pollutants in soil and groundwater needs to be delineated, and a monitoring well network needs to be installed to evaluate groundwater gradient, direction and seasonal variations in pollutant concentrations. As we discussed in our 8 September 2005 telephone conversation, this work may be implemented in phases. Since the Mel Rice Terminal is located in an area with other large manufacturing and distribution facilities, the work plan should include a site map that identifies the uses of adjacent and nearby properties. It is possible that other site investigations are being conducted nearby and there may be an opportunity to share information and access to monitoring wells. The work plan should be prepared in accordance with the enclosed Items To Be Included In A Site Assessment Work Plan. California Environmental Protection Agency