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Preliminary Subsurface Investigation <br /> City of Stockton, former Western Pacific Railroad Property, Stockton, CA <br /> May 27, 1992 <br /> W0601.I13 <br /> ' In the immediate area of the Deep Water Channel infiltration of low quality water is occurring <br /> from the channel itself. Shallow groundwater gradients for three sites adjacent to the Channel <br /> show groundwater moving in various directions away from the Channel. These sites include the <br /> Stockton Police Department, located at Channel Street and El Dorado Avenue; the Southside <br /> ' Channel Redevelopment site located at Weber Avenue and Lincoln Street; and, the Banner Island <br /> site located between Lindsay Street and the Deep Water Channel, adjacent to the subject <br /> property to the southeast. Figure 3 shows these sites and their respective local groundwater <br /> gradients. The infiltration of this channel water through fine grained dredge spoils is also a <br /> probable source of the observed poor water quality. <br /> ' In order to further demonstrate the poor water quality in the Deep Water Channel area, RESNA <br /> sampled wells located at the above referenced sites. The groundwater samples from the Stockton <br /> Police Station and the Southside Channel Redevelopment site (Figure 3) were submitted to <br /> Sequoia Analytical for analysis of Title 22 Metals. Additionally, two existing wells and seven <br /> ' new monitoring wells installed at the Banner Island property in a concurrent investigation were <br /> sampled for Title 22 Metals and volatile organics. The results of the sampling events at the <br /> adjacent sites are discussed in Section 6.2.1. <br /> 4.0 FIELD WORK <br /> 4.1 Drilling/Soil Sampling and Description <br /> On March 11 through 13, 1992, a total of 30 soil borings were drilled at the subject property. <br /> The boring locations were based on a grid pattern in an attempt to define soil conditions across <br /> the site (Figure 4). The site was divided into six, approximately equal sections. Each section <br /> 1 contained five borings. Twenty-seven shallow borings (SB-1 through SB-27) were drilled to <br /> total depths of 5 feet below grade. Three borings (MW-1 through MW-3) were drilled to depths <br /> of 38 feet below grade and completed as groundwater monitoring wells (Figure 5). The shallow <br /> R041392.SAV 7 <br />