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GROUNDWATER ASSESSMENT REPORT ' Checklist of Required Data for No Further Action Requests ' q 4 at Underground Tank Sites. (From Section 6.0 of the Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites, No Further Action Requests, -- - -�-Final Draft August 2003.)-- - - - - - — - - - - -1 1. Site History and current site conditions. ' The site was the location of the former UOP Physical Plant,the Physical Plant was removed during renovation of the area and is currently a paved parking lot See Section II and-Figures 1,2,and 6 for additional detail 2. Site geology and hydrogeology The regional and site geology consists of fine grained materials, primarily silts and clays , Shallow groundwater is encountered between approximately 15 and 32 feet below ground surface A confining layer separates the shallow aquifer from the deeper aquifer Details of the geologic and hydrogeologic conditions present at the site is discussed in Section III and ' Sechon V. Soil Boring Logs are included in Appendix B. 3. Sensitive potential receptors including water supply wells and surface water. As discussed in Section V,the Calaveras River is located approximately 1,800 feet north of the site Ten groundwater supply wells are located within a one-mile radius of the site These wells were designed to pump water from the deeper aquifer not the water table Well locations are shown on Figure 10. No other potential receptors are located within 1-mile of the site 4. Provide a map showing the location of all water supply wells used for municipal, domestic,agriculture, industnal,and other uses within 2,000 feet of the site. Provide ' well details and distances in a table As shown in Figure 10 there are four water supply wells located within 1/2-mile and eight additional water supply wells located between 1/2-mile and 1-mile radius The construction and depths of the water supply wells are further discussed in Section V. - --— —5._Provide scaled site maps-of the area impacted showing locations-of former-and existing_- -� tank systems, excavation and sample locations, boring and monitoring well locations, - - -groundwater-elevation contours, subsurface utilities, building streets, and any nearby--- -- surface waters The site is relatively flat with an elevation of approximately 7 feet above mean sea level ' Figure 1 and Figure 2 show the location of the former UST in relation to the surrounding area, campus buildings, and the Calaveras River Figure 6 illustrates the location of the Groundwater Momtonng and Sampling Report F-2 ESA/200252 Request for No Further Action December 2003