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X <br /> 2.0 c r <br /> 2.1 LITERATURE REVIEW <br /> A site history and data sena..ih will be performed to research <br /> geological and hydrogeological information pertaining to the site <br /> and surrounding area, and to further define hydrological irfluences <br /> on the site (i.e. San Joagrain River) . <br /> �N <br /> 2.2 FIELD INVESTIGATION <br /> 2.2.1 Jac ica roac <br /> The Phase II S2.te Investigation of the Holt Brothers Tractor <br /> Company facility will include she installation of approximately <br /> five additional soil borings and three additional ground water <br /> monitoring wells in the locations shown on Figure 2The proposed <br /> soil boring location will ba near the excavated soivent UST. The <br /> --.- purpose of these borings will be to verify and delineate the extent <br /> of chlorinated hydrocarbon constituents in the soil. <br /> One proposed monitoring well will be located south of the <br /> delineated plume, and will help further establish ground water <br /> gradients. In addition, should the ground water gradient change <br /> in the area date to water level fluctuations in the San Jaaquin <br /> River to the southwest and the Stockton Shipping Channel to the <br /> northeast, this well will act as an upgradient cr background <br /> monitoring well. <br /> Another proposed monitoring well location is directly within <br /> the known portion of the plume, approximately 50 feet south of <br /> monitoring well MW-1. This well. will further verify the presence <br /> and concentration of hydrocarbon constituents within or atop the <br /> water table. In addition, this well will Le constzucted for use as <br /> a hydrocarbon/water extraction well during remediation. <br /> The third proposed monitoring well location is along the <br /> undefined western border of the hydrocarbon plume. This well will <br /> be used to verify the location and concentration, if any, of the <br /> hydrocarbon plume in ground water. <br /> The exact location of these additional .soil borings and ground <br /> water monitoring welis may be altered due to the presence of <br /> underground or above ground utilities oz traffic patterns within <br /> the facility. The depths of these borings and monitoring wells, <br /> based on the information reported for the drilling of monitoring <br /> wells MW-1 through MW-4, will be approximately 35 feet with the end <br /> of the soil horings -terminating above the water table. The scope <br /> f. <br /> of work for this investigation includes: <br /> LD01.064 <br /> 3 <br />