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' GeulagccalTeclucccslru Page 14 Site Conceptual Model Report Project No 724 2 May 2,2006 ' location (Map #5, outside the 2000' radius) The gas service station at the NE corner of S Stanislaus and E Charter Way has monitoring well traffic boxes on the property (Map#6) ' It is not known if the wells that have been abandoned were properly destroyed in accordance with applicable standards or if more wells are similarly disconnected and have not been identified A designation for the beneficial use of groundwater in the vicinity of the Morita ' Property facility as domestic supply is appropriate based on the results of the receptor survey outlined above ' 3.0 POTENTIAL OFF-SITE SOURCES OF GASOLINE CONTANIINATION GTI has identified potential off site sources of contamination from first hand experience Three automotive fueling facilities with USTs and therefore potential sources of gasoline contamination are directly to the west of the site along the north side of Charter Way 701 E Charter Way (K & S Gas & Grocery) [701 site], 709 E Charter Way (street number not definitive, name unknown), and 749 E Charter Way [GASCO or Darpetro site] GTI staff attempted to review the SJC PHS/EHD UST files for the latter two sites but access was denied for the 709 E Charter Way site (copy of SJC PHS/EHD denial letter in Appendix A) ' The available files for the 749 E Charter Way site were reviewed and GTI confirmed that a gasoline release from an UST has occurred at this facility A second source of information for the 701 and 749 sites is the California State Geotracker database for UST release sites (GTI unable to identify the 709 site on database) GTI accessed the web site via the internet and downloaded/noted relevant data for reference The ' database included groundwater analytical information from the September 2005 groundwater monitoring event for the 701 site This information shows that the most heavily impacted well, MW-3, contained 95,000 ug/l TPH-G for the September 2005 event This site is one ' block or approximately 500 feet west of the Morita Brothers property The data from the closest site suggests that the gasoline release from the GASCO 749 E Charter Way property has directly impacted the Morita Brothers site and a co-mingled plume is present This site is on the opposite (northwest) corner from the Morita Brothers property that is located on the southeast corner of the intersection of E Charter Way and Grant Street GTT downloaded GeoTracker's latest report for the site- January 31, 2006 "Quarterly Report January 2006" prepared by California Geophysical Group, Inc (CGG)- and included it in this SCM as Appendix G The report contains laboratory analytical data for 15 monitoring wells ' associated with the site GTI has prepared a diagram incorporating the approximate locations of the GASCO site wells and the Morita Brothers wells into one snap Figure 15 shows the approximate locations of the GASCO site wells with the relevant TPH-G data for the January 16, 2006 monitoring event next to the wells The map also includes groundwater data from a single CPT point, B-4, advanced on the southeast corner of the GASCO site The Morita intermediate aquifer levels wells and their corresponding TPH-G data for the February 24, ' 2006 monitoring event are included as well