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c7cob9ical Tec%ics ka <br /> 11017"'Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> Remedial Action Report <br /> Soil Excavation & Well Installation Activities <br /> ' Sinclair Trucking <br /> 3780 West Linne Road <br /> Tracy, California <br /> Project No. 1030.2 <br /> ' August 11, 2005 <br /> 1.0 INTRODUCTION <br /> 1.1 Site Description <br /> The Sinclair Trucking (ST) site is located at 3780 Linne Road in Tracy, California (Figure 1). <br /> ' There are currently no USTs on the property. The property is a developed lot on <br /> approximately one-acre surrounded by open fields of row crops. The site has a residence, <br /> maintenance & service buildings and a parking area. Areas of the site not occupied by <br /> ' buildings are covered in compacted base rock material or native soil. Groundwater bearing <br /> has historically averaged N47°E and the historical average groundwater gradient for the site <br /> is 0.0037 ft/ft (Table 1). <br /> ST is located in the southeast quarter of the northwest quarter of Section 7, T3S R6E related <br /> to the Mount Diablo B&M, on the United States Geological Survey (USGS) topographic <br /> ' map, Vernalis Quadrangle, California, 7.5 minutes series. A review of the USGS <br /> Topographic Map reveals that the elevation of this site is approximately 75 feet above mean <br /> sea level (AMSL). <br /> ' The site is Iocated on the gradually sloped floor of the northern San Joaquin Valley.q y The <br /> geologic composition of the area is characterized as fluvial deposits of the San Joaquin - <br /> Sacramento River delta system that overlay. continental.rocks and deposits derived from ---- <br /> erosion of the Sierra Nevada Mountain Range located approximately 50 miles northeast of <br /> Modesto. <br /> ' The southwest tilting Sierra Nevada fault block underlies the northernan <br /> S Joaquin Valley <br /> area. Overlying the consolidated rocks are unconsolidated sediments. The lower <br /> i <br /> 1 <br />