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TABLE OF CONTENTS <br />1 <br />2 <br />3 <br />4 <br />EXECUTIVE SUMMARY <br />BACKGROUND <br />SITE SETTING <br />3.1 SITE LOCATION <br />3.2 CURRENT USE AND SITE CHARACTERISTICS <br />3.3 REGIONAL GEOLOGY AND HYDROLOGY <br />ACTIVITIES CONDUCTED <br />1 <br />4 <br />6 <br />6 <br />6 <br />6 <br />7 <br />4.1 MONITORING WELL INSTALLATION AND SAMPLING 7 <br />4.1.1 Permitting and Pre-field Activities 7 <br />4.1.2 Monitoring Well Installation 7 <br />4.1.3 Monitoring Well Development 8 <br />4.1.4 Initial Groundwater Sampling 8 <br />4.2 SHALLOW SOIL SAMPLING 8 <br />4.2.1 Vehicle parking Area (B-2) 9 <br />4.2.2 Depression Near the Eastern Edge of the Site (B-3 and B-4) 9 <br />4.2.3 Former AST Areas (B-5 and B-7) 9 <br />4.2.4 Former Tank Washout Area (B-1 and B-8) 10 <br />4.2.5 Leach Field (B-6) 10 <br />4.3 DOMESTIC WELL SAMPLING 10 <br />4.4 GEOPHYSICAL SURVEY SAMPLING 11 <br />5 LABORATORY ANALYSES 1/ <br />RESULTS, CONCLUSIONS AND RECOMMENDATIONS 14 <br />6.1 RESULTS 14 <br />6.1.1 Shallow Soil Results 14 <br />6.1.2 Monitoring Well Soils Results 15 <br />6.1.3 Groundwater Results 16 <br />6.1.4 Geophysical Survey 18 <br />6.2 CONCLUSIONS 18 <br />6.3 RECOMMENDATIONS 21 <br />I. <br />I. <br />7 LIMITATIONS <br />27125.E0I /STO4R181 <br />© 2004 Kleinfelder, Inc. <br />KLEINFELDER 2825 East Myrtle Street, Stockton, CA 95205-4794 (209) 948-1345 (209) 948-0621 fax <br />Page ii of iii <br />February 13, 2004