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a <br /> i <br /> ME <br /> 1 aw <br /> 1107 <br /> 1 <br /> Site Assessment Report April 5, 1991 <br /> 139 South Center,Stockton,CA Page Ill <br /> csu <br /> Ka TABLE OF CONTENTS <br /> I ' PAGE <br /> INTRODUCTION .. ............ ........................... .. ........ ...:... 1 <br /> BACKGROUND .... .... ...... .. <br /> SITEHISTORY .. . ...... .................... .......... . ............ 1 <br /> SITE SETTING ........ .... . <br /> Ir SCOPE OF WORK . .... . ........ ....... . ...................... ..... ........... .. 5 <br /> �. MONITORING-WELL INSTALLATION PAOCEEDURES . 5 <br /> r : <br /> Soil Borings ... .. .................. . ....... ........... ........ . . . 5 <br /> Monitoring Well Const", on ............... ....... ...... ... . .... . ... . . 6 <br /> Monitoring Well Development ..... . .... . ... ..... . ........ .... .......... 7 <br /> 5 GROUNDWATER MONITORiNG AND SAMPLING............ . .. .... .... ..... . ... .. 7 <br /> SUBSURFACE CONDITIONS..... ..... .. ..... .... ... .. .. . ..... . .. .... .. . . ...... .. . . 9 <br /> i.., SOILS ...... .. . ....... . .... . . ........... . .. ... ........ ..... . ..... . .. . . . 9 <br /> GROUNDWATER 11 <br /> SIEVE ANALYSES.............. . .. ........ . 14 <br /> SUMMARY AND CONCLUSIONS......... . . .... ....... .. ......... ........ .. ........ 14 <br /> is <br /> I ' LIST OF FIGURES <br /> FIGURE 1 SITE LOCATION MAP . 2 f <br /> i,: FIGURE 2 SITE PLAN ....... ..... ... ............ . .. ......................... 4 <br /> FIGURE 3 PHOTOGRAPHS OF LOCATIONS OF MONITORING WELLS MW-1 THROUGH MW-4 .8 <br /> l FIGURE 4 GENERALIZED GEOLOGIC GROSS SECTION .......... . .. .... ............ 10 } <br /> FIGURE 5 POTENTIOMETRIC SURFACE MAP(03/08/91) .. .. .............. . ......... 12 ! <br /> E FIGURE 6 TPH-AS-GASOLINE AND BENZENE MAP(03/08/91) . . ........ ... ....... . ... 19 € <br /> s <br /> i <br /> ! i <br /> w� <br /> �,y I <br /> C•� <br /> GROUNDWATER s <br /> i 1 ECHl40LOCY.INC. <br /> Faye <br /> IL <br />