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u� <br /> l ��// 1117 Lone Palm Avenue, Suite B <br /> \�•/ Modesto, CA 95351 <br /> www.atcassociates.com <br /> 4TC 209-579-2221 <br /> ASS O C I ATE S INC , Fax 209-579-2225 <br /> Environmental, Geotechnical and Materials Engineers <br /> TABLE OF CONTENTS <br /> CONTENT PAGE <br /> 1 . 0 INTRODUCTION .. 1 <br /> 1 . 1 Site Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 <br /> 1 .2 Background Information . . . . . . . : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I <br /> 2.0 METHODS AND PROCEDURES ....................................... .......... ................... .............. 2 <br /> 2. 1 Drilling Activities . . . . . . . . . . . . . . . . : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 , 3 <br /> 2.2 Groundwater Monitoring Well Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 <br /> 2. 3 Monitoring Well Development and Surveying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 <br /> 2.4 Groundwater Sampling and Analyses . . . . . . . . . . . . . . . . . . .. . . ., . . . . ... . . . . . . . . . . . . . . .. . . . .. . . . . . . . . . . ., . . .. . . 4 <br /> 3.0 SUBSURFACE CONDITIONS ............................................ .................... ......... .............. 5 <br /> 3 . 1 Geology . . . . . . . . . . . . . . . . . .. . . . . . . . . . . .. . . . . ... . . . .. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 <br /> 3 .2 Hydrogeology .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 <br /> 4.0 ANALYTICAL RESULTS................................................................................. ..... ........ . 5 <br /> 5.0 CONCLUSIONS ........ .......................................... ........ ............... ...................................... 6 <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 : Groundwater Contour Map Shallow Zone (52-68 ') December 7, 2006 <br /> Figure 5 : Groundwater Contour Map Intermediate Zone (85 -90 ') December 7, 2006 <br /> Figure 6 : Benzene Isoconcentration Map Shallow Zone (52-68 ') December 7, 2006 <br /> Figure 7: MTBE Isoconcentration Map Shallow Zone (52-68 ') December 7, 2006 <br /> Figure 8: 1 ,2-DCA Isoconcentration Map Shallow Zone (52-68 ') December 7, 2006 <br /> Figure 9 : Benzene Isoconcentration Map Intermediate Zone (85 -90 ') December 7 & 8 , 2006 <br /> Figure 10: 1 ,2-DCA Isoconcentration Map Intermediate Zone (85 -90 ') December 7 & 8, 2006 <br />