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0 0 <br /> II . SOURCES OF CONTAMINATION <br /> l <br /> The general term of surface water collection and disposal is used <br /> herein to encompass all known sources of hazardous waste <br /> contamination at the Stockton site. This category includes <br /> obvious sources of contamination at the wood treating retort area <br /> ( i .e. , the use and storage of wood processing chemicals at this <br /> location and potential drips and spills of such solutions fro in <br /> the processed wood in the drip area) and the more subtle sources <br /> 1 of contamination resulting from precipitation run -off <br /> ( contamination in these areas and in the treated wood <br /> inventory/storage areas. The more generic term of "housekeeping" <br /> which is used throughout this document applies to both the <br /> process and storage areas. <br /> i. A. Process Waste Waters <br /> The wood preserving process utilized by Marley falls under the <br /> EPA's wood treating subcategory "water borne - inorganic salts ". <br /> The process utilizes concentrated solutions of sodium dichromate <br /> and copper sulfate (prior to 1982 , the process also included <br /> arsenic bearing compounds for a CCA solution ). It is <br /> acknowledged that small spills and leaks of these concentrated <br /> solutions are significant sources of hazardous metal <br /> contaminants. The process must be designed to minimize releases <br /> of these compounds to the environment. Containment structures <br /> must be designed around the retort and drip areas to promote <br /> collection of accidental spills and drips of these compounds and <br /> overall containment within the treatment process. Marley <br /> acknowledges the need for these design features and has <br /> 3 <br />