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Geological Tecldcs Inc. <br /> Page 11 <br /> City of Escalon <br /> Project No.: 750.2 <br /> May 16,2005 <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 /> Lunlikely 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 3.11 G. <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 /> 3.12 Reports and Information <br /> Unauthorized Release Form (URF), Quarterly Monitoring Reports and other correspondence <br /> are on file with SJCEHD and CRWQCB and are not included in this summary report. <br /> Additional investigative and characterization reports related to the COE site include: <br /> • GTI: Soil and Groundwater Investigation Report—March 15, 1999 <br /> • GTI: Additional Site Characterization Report—January 31, 2000 <br /> L • GTI: Soil Vapor Extraction Pilot Test Report—August 8, 2000 <br /> • GTI: Well Receptor Survey Report November 14, 2000 <br /> �''' • GTI: Additional Site Characterization Report—January 30, 2001 <br /> "✓ • GTI: Revised Corrective Action Plan— Vadose Zone Remediation dated Feb 26, 2001 <br /> • GTI: Interim Soil Investigation Report —October 2, 2003 <br /> 3.13 Rationale <br /> For the following reasons, the conditions at this site should not adversely impact water <br /> quality,public health, or beneficial use of this property. <br /> LSite Conditions <br /> • No groundwater contamination has been detected in the last nine quarterly monitoring <br /> r- events. <br /> L • The contamination at the site is primarily soil contamination with the bulk being <br /> removed by vapor extraction and limited excavation activities. <br /> • The USTs, dispenser islands and primary soil contamination source has been <br /> removed. <br /> • There are no domestic, municipal or production wells within at least a 1,600-foot <br /> radius for any residual contamination to impact. <br /> • There are no surface waters within at least a 2,000-foot radius for any residual <br /> contamination to impact. <br /> • The soil is primarily a mixture of sands and silts. The small amount of remaining <br /> contamination will have a tendencyto adsorb to the fine-grained silt units, thereby <br /> g Y <br /> impeding vertical migration. <br /> iC <br />