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v 1�j TUSO PROPERTY Page 12 6. WKA No. 5475.02 June 2, 2003 L The Zacharias clay loam formed in alluvium derived from mixed rock sources. The surface layer is typically grayish brown and dark grayish brown clay approximately 20-inches thick. The i subsoil, approximately 60-inches thick, consists of grayish brown, dark grayish brown, dark L brown, and pale brown clay. ` The SCS indicates that the soils found in the project area have historically and predominantly supported irrigated pasture. Other irrigated crops listed as typically cultivated on soils of the Lproject area are orchard crops. Radon Potential L This discussion of the potential for radon exposure for the subject property and vicinity is based on review of available scientific literature on the topic. Radon isotope-222 is a colorless, odorless, 6. tasteless radioactive gas that is a natural decay product of uranium. Uranium and radon are present L in varying amounts in rocks and soil, and radon is present in background concentrations in the atmosphere. Current evidence indicates that increased lung cancer risk is directly related to radon- decay products. Radon potential of rocks and soils and indoor radon exposure levels in the United States are currently areas of intense research by governmental regulators as well as the geoscience and ` medical communities. At this time,the EPA has recommended an"action"level for indoor radon 1 concentrations at or exceeding 4 pico-curies per liter of air(pCi/1). The EPA has extrapolated a 1% L to 3%lung cancer mortality rate due to a lifetime of exposure at 4 pCi/l;that is, 1 to 3 persons per I 100 exposed to this concentration for life will die of lung cancer induced by radon. L The California Statewide Radon Survey Interim Results,based on the EPA/State Department of Health Services State Radon Survey,predicts that only 3.6%of homes in San Joaquin County L would exceed the EPA's recommended level of 4 pCi/1. Additionally, California ranks as the third ! lowest for percentage of homes exceeding 4 pCi/1 of the 33 states participating in the study. V Specific indoor radon information for new(proposed)buildings on the subject property can only be ` obtained subsequent to construction of site buildings where radon testing would be feasible. EPA generically recommends that all owners test their homes and commercial buildings for radon. Site- specific geology, construction materials and methodologies,use characteristics of building L WALLACE•KUHL &ASSOCIATES INC.