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Yl � 13 February 2006 • Appendix A - Site Background Page 2 of 4 recycled Into fertilizer blends or evaporated in a two-stage polyvinyl, concrete lined pond Secondary to the bulk distribution is batch processing,whereby a stainless steel mixer(I 0-ton batch) mixes dry potash,water and liquid fertilizer additives to generate the liquid fertilizer blends that will be transported to farm locations Dry and liquid bulk fertilizer components are delivered to the site by contracted trucking firms, dry chemicals are stored in concrete-divided storage bins or a dry hopper,whereas liquid chemicals are stored in twelve large steel tanks under secondary containment All loading and mixing are continually supervised by RFS trained personnel, any spills are Immediately cleaned up, swept-up, or recycled Into the appropriate fertilizer blends, rinse water is containerized and recycled or allowed to desiccate within concrete holding ponds at the eastern edge of the RFS site Surface rain water from the fertilizer batch plant area does not leave the site,the water is collected and recycled Into fertilizer blends or evaporated within the two-stage polyvinyl, concrete lined ponds In addition, no surface or mix water leaves the site, or is discharged to the site, rather, it is collected and recycled by RFS trained personnel Boxed and containerized herbicide and fertilizer chemicals are stored in the main storage/office • building in the western portion of the site Additionally, the RFS facility stores and delivers spray oil for seasonal treatment of orchards and vines The RFS facility utilized the Federally-mandated Security and Training Program, a Hazardous Communication Plan and Risk Management Plan(Hazardous materials management plan-HMMP), as required by the San Joaquin County Office of Emergency Services (OES) and Ripon Fire Department REGIONAL GEOLOGICALIHYDROGEOLOGICAL SETTING The site is situated within the Great Valley Geomorphic Province of California, a large, elongate northwest tending, asymmetric structural trough The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada,respectively Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origin The Great Valley Province has been subdivided Into two mayor divisions identified as the Sacramento and San Joaquin Valleys The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the Advanced GeoEnvironmental,Inc