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SLjbrurface lnvestigetton Results <br /> 6131 Pacific Ave., titockton, CA. <br /> Aegis Project No. 90-020 <br /> Page i <br /> TABLE OF CONTENTS <br /> 1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . 1 <br /> 1.1 PURPOSE . . . . . . . . . . . . . . . . . . . . . . I <br /> 1.2 SCOPE . . . . . . . . . . . . . . . . . . . . . . . 1 <br /> 2.0 BACKGROUND INFORMATION . . . . . . . . . . . . . . . . 3 <br /> 2.1 SITE LOCATION <br /> . . . . . . . . . . . . 3 <br /> 2.2 SITE DESCRIPTION . . . . . . . . . . . . . . 3 <br /> 2.3 ADJACENT LAND USES . . . . . . . . . . . . . . . . . 5 <br /> 2.4 TANK STORAGE. PRODUCTS . . . . . . . . . . . . . . . 5 <br /> 2.6 UTILITIES . . . . . . . . 7 <br /> s <br /> 2.6.1 On-Site Underground Utilities . 7 <br /> 2.6.2 Off-Site Utilities . . . . . . . . . . . . . 7 <br /> } 2.7 SITE SUBSURFACE CONDI'T'IONS . . . . . . . . . . . 7 <br /> 2.8 SITE HYDROGEOLOGIC/ REGIONAL GEOLOGY . . . . . 9 <br /> 2.9 WATER WELL INFORMATION . . . . . . . . . . . . . 9 <br /> 3.0 RESULTS OF SUBSU?FACE INVESTIGATION . . . . . . . . . . 9 <br /> 3.1 SOIL CONDITIONS . . . . . . . . . . . . . . . 9 <br /> 3.2 GROUND WATER CONDITIONS . . . . . . . . . . . . . . 12 <br /> 3.3 PETROLEUM HYDROCAREONS IN SOIL . . 12 <br /> - 3.4 PETROLEUM HYDROCPABONS IN SOIL: ORIGINAL TANK <br /> E <br /> 1 BASIN . . . . . 12 <br /> t 3.5 PETROLEUM HYDROCARBONS IN•SOIL; PROPOSED NEW TANK <br /> ! LOCA'T'ION . . . . . . . . . . . . . 12 <br /> 4.0 TANK CLOSURE RESULTS/ACTIVITIES . . . . . . . . . . . . . 17 <br /> 4.1 TANK CONDITIONS . . . . . . . . . . . . . . . 17 <br /> F 4.2 SOIL SAMPLING FROM BENEATH THE TANKS . . . . . . 17 <br /> 4.3 SOIL SAMPLING FROM BENEATH PRODUCT LINES . . . . . . 17 <br /> 5.0 DISCUSSION OF RESULTS . . . . <br /> . 1 <br /> • . . 21 <br /> 5.1 PETROLEUM HYDROCARBONS INSOIL: TANK <br /> W BASIN . . . . . 21 <br /> 5.2 PETROLEUM•HYDROCARBONS IN SOIL: NEW TANK BASIN . . . 21 <br /> 5.3 PETROLEUM HYDROCARBONS IN SOIL: PRODUCT LINES . . . 21 <br /> 5.4 HORIZONTAL EXTENT OF PETROLEUM HYDROCARBONS IN <br /> zs SOIL . . . . . . . . . . . . . . . . . . . . 21 <br /> 5.5 GROUND WATER . . . . . . . . . . . . . . . . . . . 25 <br /> 6.0 CONCLUSIONS . . . . . . . . . . . . . . . . . . . . . . . 25 <br /> I <br /> 7.0 RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . 26 <br /> 8.0. PROPOSED WORK PLAN . . . . 26 <br /> I ' 8.1 VAPOR WELL INSTALLATION/CONSTRUCTION DETAILS 2E <br /> 8.2 VAPOR EXTRACTION MANIFOLD SYSTEM 27 <br /> 1 . <br />