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a <br /> 1117 Lone Palm Avenue, Suite B <br /> V TC esto, CA 95351 <br /> www.atcassoc 79-221 <br /> �, <br /> 209-579-2221 <br /> Ass o C i Are s i N C . Fax 209-579-2225 <br /> Environmental, Geotechnical and Materials Engineers <br /> TABLE OF CONTENTS <br /> I <br /> Ll CONTENT PAGE <br /> 1.0 INTRODUCTION ......................................................................................................................... 1 <br /> LISite Location . . . . .. . . .. . . . . . .. . . . .. . . . .. . . . . . .. .. .. . . . . ... . . . . . . . . . . . . . . . .. . .. . . . . .. . . . . . . . . .. .. .. . . . . . . . . . . . .. . .. ... . . . . . . . . . . . . . .. 1 <br /> 1 .2 Background Information .. . . . . . .. . . . .. .. .. .. . . .. ... . . . . . . . .. . . . . . . . . . . . . . . ... . .. . . .,. .. .. .. .. .. . . . , . . . .. . . . ... .. .. . . ... .. . .,. 1 <br /> 2.0 METHODS AND PROCEDURES............................................................................................... 3 <br /> rI2. 1 Drilling Activities .. .. . . . .. . .. .. . .. . . . . . .. . . . . . . . . .. ... . . . . . . . . : . .. . . . . .. .. . .. . :. . .. . . . . . .. .. . .. . .. . . . . . . . .. . .. . .. .. . . . . .. . .. . : . . "3 <br /> J 2.2 Groundwater Monitoring Well Construction . . . . . .. . .. . . . ... .. . .. . .. . . . . . .. . . . ... . . .. . . . . . .. . .. . . . .. . . . . .. I .. . . . . 3 <br /> 2.3 Monitoring Well Development and Surveying. . . .. . .. ... .. . . . .. . . .. . . . . . .. .. . . .. .. .. .. . . . . . . . . . .. .. . . . . .. . . . . . . . 4 <br /> 2.4 Groundwater Sampling and Analyses . .. . .. .. . . . . . . . . .. . . . .. . .. . .. . .. . .. . . . . ... . . . . . . . . .. . .. . . . . . . . . .. .. .. . . .. . . . . . . . 4 <br /> 30 SUBSURFACE CONDPIION5 .................................................................................................... 5 <br /> 3 . 1 Geology. . .. . .. . ... . . . . . .. . . . . . . . . .. . . . .. .. . .. . : . . . . . .. . . . . .. . . . . . . : . . . . . . . . . .. .. . .. . . . . .. . . . : . .. . . . . .. . .. . . . . . . . . . . . . .. .. .. .. . . : . . . .. . 5 <br /> � I3 .2 Hydrogeology . . .. . . .. . . .. . . . . .. . . . .. . . . .. .. . . . . . .. . . . . .... . .. . . . . . . . . . . . .. . .. .. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . .. .. .. .. . . . . . . .. . 6 <br /> ,- 4.0 ANALYTICAL RESULTS ........................................................................................................... 6 <br /> II <br /> I 5.0 GEOTRACKER DATA UPLOAD ................. <br /> 6.0 CONCLUSIONS ............................................................................................................................ 7 <br /> TABLES <br /> Table 1 : Survey Data <br /> Table 2: Summary of Groundwater Monitoring Data <br /> Table 3 : Summary of Groundwater Analytical Results <br /> FIGURES <br /> Figure 1 : Vicinity Map <br /> Figure 2 : Aerial Photograph of Site Vicinity <br /> Figure 3 : Site Plan <br /> Figure 4: Line of Cross-section <br /> Figure 5 : Geologic Cross-section A-A' <br /> Figure 6: Groundwater Contour Map Shallow Zone (52-68 ') March 6, 2008 <br /> l � Figure 7: Groundwater Contour Map Intermediate Zone (85-90 ') March 6, 2008 <br /> Figure 8 : Benzene Isoconcentration Map Shallow Zone (52-68') March 6, 2008 <br /> Figure 9 : MTBE Isoconcentration Map Shallow Zone (52-68 ') March 6, 2008 <br /> Figure 10 : 1 ,2-DCA Isoconcentration Map Shallow Zone (52-68 ') March 6, 2008 <br /> Figure 11 : Benzene Isoconcentration Map Intermediate Zone (85-90') March 6, 2008 <br /> Figure 12 : 1 ,2-DCA Isoconcentration Map Intermediate Zone (85-90') March 6, 2008 <br />