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Irl ilss 09 09-M WFM Laptop FAX Mill n F MoClenney,RG REn Page 2 of 5 ROGER FODTT ASSCX71ATFS 11 January 1995 Mr Robert Huntley, General Manager Stockton Plating Incorporated 632 South El Dorado Street Stockton, CA 95203-3407 SUBJECT PRELIMINARY ANALYTICAL RESULTS RELATED TO INSTALLATION AND SAMPLING OF MONITORING WELL#4 STOCKTON PLATING INCORPORATED 632 SOUTH EL DORADO STREET STOCKTON, CALIFORNIA REFERENCE: TELEPHONE DISCUSSION 10 JANUARY 1995 RFA Projects 366-002 and 366-005 . Dear Mr Huntley, At your request, I am writing to discuss the preliminary results obtained from activities associated with installation of Monitoring Well #4 (MW4) at the above mentioned facility At the present time we are lacking only the Total Petroleum Hydrocarbons as diesel (TPHd) result from the most recent sampling of MW4 This letter is not a report of the assessment but should be considered as a preliminary discussion of the results obtained to date and the ramifications gleaned therefrom. MW4 was installed beginning 16 November 1994 and completed 30 November 1994 The delay of i completion resulted from mechanical failures associated with the dnllmg contractors equipment. Soil samples were collected for laboratory analysis at the 15, 25 and 30 foot depth levels on 16 November 1994 and from the 35, 40, 45 and 46 5 foot levels on 30 November 1994 The fatal, sample at the 46 5' depth was collected in the capillary fringe above the groundwater surface The samples were analyzed for TPH as gasoline(TPHg)(with associated BTEX compounds),TPHd and organic lead While not anticipating to find evidence of the presence of these materials, the soil samples were submitted for these analyses on the off chance that they may turn out to be present We anticipated that the distance of MW4 from the presumed source would be great enough to place it outside of the fuel impacted soils This presumption was mostly borne out as all of the samples were found to be below the respective reporting hnuts for the target analytes The analytical laboratory reported that sample SMW4-46 5, the sample taken from the capillary fringe,contained TPH as motor oil at a concentration of 9 3 mglkg This particular analysis had not been requested, however, the chemist noted the presence of higher range hydrocarbons than diesel in the analysis and continued the chromatographic scan to capture peaks in the range for motor oil Although not requested to do so, the laboratory ran all of the samples from the 30 1401 Halyard Dive,Saute 130. P 0 Box 426.West Sacramento,CA 95691 . 916!325-25$0.Fax 9161325-2570