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Appendix B - Site Background Information Former Fisco Warehouse Page 2 of 6 ground water in the area of the former UST. RECEPTOR SURVEY AGE conducted a well survey during First Quarter 2000 to identify municipal,domestic,industrial, irrigation and monitoring wells located within a 2,000-foot radius of the site. The survey did not identify any municipal wells within the 2000-foot search radius. The nearest municipal well was located approximately 3,600 feet northwest of the site. Eleven domestic/agricultural wells were identified within 2,000 feet of the subject site.Thenearest well was located approximately 900 feet west of the site,and the nearest domestic well down-gradient from the site was approximately 1,250 feet south of the site. Six sites with ground water monitoring wells were identified within 2,000 feet of the site. One site is the former Canteen Corporation site at 1500 Shaw Road. HYDROGEOLOGICAL MODEL Hydrogeologic or hydrostratigrapbic units (HUs)are defined as a body of rock or sediment that has hydrogeologic characteristics that make it distinct from surrounding bodies of rock or sediment (Sanders, 1998), or a part of a body of rock that forms a distinct hydrologic unit with respect to the flow of ground water (Maxey, 1964). A `flow unit' may be defined as a hydrogeologic unit and is characterized by significantly greater hydraulic conductivity values than overlying and underlying units. A flow unit is capable of serving as a preferred migration route, and could potentially allow migration of large contaminant masses over great distances. The model presented is interpretational and will be modified as more data is collected. The four vertical zones identified are as follows (depths are approximate and can vary by several feet across the site): Vadose Zone-Extending from surface grade to 62 feet bsg,the depth to the water table.The vadose zone is predominantly fine grained material(silt/clay)with fine grained soil occurring from surface grade to 62 feet bsg with a fine to coarse grain sand unit occurring between 25 feet and 45 feet bsg across the site. The zone is characterized by low pore pressure. Hydrostratigraphic Unit 1 (HU1),at the top of the current saturated zone, extends from 62 feet to 80 feet bsg and is comprised of silty sand to sandy silt and characterized by predominantly high pore pressure. Hydrostrati graphic Unit 2 (HU2) extends from 80 to 96 feet bsg, is a mix of coarse grained sands and gravelly sands and silty clay, and is characterized by low pore pressure. Advanced GeoEnvironmental,Inc