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7hN3dwe11&Rd10 <br /> • 1.2.1.3 Area 20 <br /> Description <br /> This site is referred to as the former Western Pacific Rail Road site. The site, currently a vacant <br /> dirt lot(Figure 6),is north of West Lindsay Street,between North Harrison and North Madison <br /> Streets. <br /> Site History <br /> This site was originally used as a switching yard for the Western Pacific Rail Road. <br /> Previous Investigations <br /> In 1992, RESNA conducted a soil and groundwater investigation at the site for the SDHR. The <br /> • investigation included drilling 30 shallow soil borings to collect soil samples at 5 feet bgs, <br /> followed by compositing the samples into six 5:1 samples for laboratory analyses. Three of the <br /> borings were extended to 38 feet bgs and completed as monitoring wells (RESNA, 1992). The <br /> investigation results indicated that no volatile or semi-volatile compounds, including petroleum <br /> hydrocarbons, were detected in soil or groundwater, and Title 22 metals detected in soil and <br /> groundwater did not exceed Total Threshold Limit Concentrations. RESNA recommended that <br /> no additional work be performed. The RESNA report is included in Appendix C. <br /> Additional soil and groundwater sampling was conducted by Treadwell & Rollo in September <br /> 1999. This work was reported in the 3 December 1999 Site Characterization Report. Also, <br /> monitoring wells MW-2 and MW-3 were sampled and Figure 6 shows their locations. <br /> Analytical results are given in Tables 1 through 7. <br /> On 15 September 1999, a backhoe was used to dig six exploratory pits. Test pits 20TP-1 through <br /> 20TP-6 were excavated to 6 feet bgs at the locations shown on Figure 6. Twelve soil samples <br /> 9 <br /> 25970309.DGD 24 August 2000 <br />