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1.0 GENERAL INFORMATION AND CONTRACTOR QUALIFICATIONS <br /> 1.1 Introduction <br /> The general scope of work consists of the construction, development and <br /> performance testing of one groundwater extraction well. The extraction well will <br /> be installed for the Occidental Chemical Corporation's Lathrop Groundwater <br /> Remedial Program located on property currently owned by the J.R. Simplot <br /> Company near Lathrop, California (Figures 1 and 2). The extraction well will be <br /> designated EW-4A. <br /> For the purposes of the remedial program, the aquifer is divided into three <br /> zones. The "shallow" zone extends from 31 feet to 83 feet beneath the ground <br /> surface (bgs), the "intermediate" zone ranges from 84 feet to 150 feet bgs, and the <br /> deep zone extends from 151 feet to 218 feet. The new extraction well is being <br /> installed to extract groundwater with elevated contaminant concentrations solely <br /> from the deep zone of the aquifer. <br /> The new extraction well will replace the existing extraction well EW-4, and <br /> will supplement six other existing extraction wells at the site which are part of an <br /> ongoing remedial program. Because it is the intent for the well to draw from a <br /> specific hydrogeologic zone, the well will be constructed with the screen location <br /> in a specific target zone. The actual screen depth will be selected based on the <br /> results of geophysical logging. <br /> 1.2 Site Conditions <br /> The proposed well site (shown on Figures 2,3 & 4) is located in an open <br /> field area. Perimeter fencing is the only access restriction. Accessibility to the <br /> 1 <br />