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1 C <br /> CirologualTerk�u�rinG Page 13 <br /> Valley Wholesale Drug Company <br /> Project No 989 2 <br /> November 8,2004 <br /> closely built-up areas in cities Streets, parking lots, buildings, and other <br /> structures cover more than 85 percent of the surface The potential for health <br /> ' risks caused by human exposure (dermal, ingestion or inhalation) is negligible <br /> due to unlikely contact with subsurface hydrogeology <br /> H The potential for damage to wildlife, crops, vegetation and physical structures <br /> ' caused by exposure to contaminants is minimal due to the reasons discussed <br /> above in Section 3 11G <br /> I The persistence and permanence of the potential adverse effects are finite It <br /> ' is unlikely that humans or wildlife will come in contact with the contaminants <br /> The contaminants have been steadily decreasing with time and will attenuate <br /> to background conditions Charts 1 and 2 show the steady decline in TPH-G <br /> ' and BTEX constituents over time <br /> 2) Potential adverse effects on surface water quality and beneficial uses <br /> ' A Mass estimate calculations suggest there are approximately 0 1 gallons of <br /> TPH-G and 0 034 gallons of MtBE remaining in the groundwater at VWDC <br /> The surface areas on and near the site are capped by structures, concrete or <br /> ' asphalt Impact to surface water is unlikely <br /> B Hydrogeological characteristics of the facility and surrounding land are <br /> relatively uniform layers of clay-silt mixtures, sand-clay mixtures and clays <br /> MThe details are discussed in Section 2 5 <br /> C Groundwater bearing and slope average N30°W at 0 0065 ft/ft as discussed in <br /> Subsection 2 5 3 2 Groundwater velocity is estimated to be 0 012 to 0 020 <br /> tfeet per year as discussed in Subsection 2 5 3 3 <br /> D There are no groundwater users within a 2000-foot radius of the VWDC site <br /> as discussed in Section 3 1 <br /> ' E According to the USDA Soil Survey of San Joaquin County, California <br /> (McElhiney, M A , 1992), streets, parking lots, buildings, and other structures <br /> cover more than 85 percent of the surface of the soils on or near VWDC The <br /> ' details are discussed in Subsection 2 5 2 It is not likely that potential future <br /> uses of groundwater in the area will be impacted. <br /> F It is unlikely surface water uses will change in the foreseeable future <br /> ' G The Stockton Deep Water Channel and the Mormon Slough have issues of <br /> environmental impact However, as discussed above, it is unlikely that <br /> t potential future uses of groundwater in the area will be impacted <br /> H Surface waters are at such a distance that the potential for health risks caused <br /> by human exposure (dermal, ingestion or inhalation) is negligible due to <br /> ' unlikely contact with subsurface hydrogeology <br /> I The potential for damage to wildlife, crops, vegetation and physical structures <br /> caused by exposure to contaminants is minimal due to the reasons discussed <br /> ' above in Section 3 11G <br /> J The persistence and permanence of the potential adverse effects are finite It <br /> is unlikely the contaminants will come in contact with surface waters It is <br /> unlikely that humans or wildlife will come in contact with the contaminants <br />