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ARCADIS Phase II Field <br /> Investigation Work Plan <br /> 2.3 Monitoring Well Installation and Sampling Union Pacific Railroad <br /> Company <br /> Former Maintenance Facility <br /> It is anticipated that up to five monitoring wells will be installed based on the Tracy,California <br /> CPT/HydroPunchTm data obtained in this investigation,as well as current groundwater <br /> monitoring data. Monitoring wells will be installed in the A-Zone using a hollow-stem <br /> auger drill rig. Details of installation methods are provided in Appendix B. Sampling <br /> methods are described in the 2007/2008 Annual Groundwater Monitoring Report <br /> (ARCADIS 2008b). Monitoring wells will be sampled quarterly until sufficient data are <br /> obtained to evaluate plume stability. Samples will be analyzed for the following: <br /> • TEPH as diesel using United States Environmental Protection Agency(USEPA) <br /> Method 8015B; <br /> • TEPH as diesel following a silica gel cleanup(TEPH-SG as diesel) using USEPA <br /> Method 3630C; <br /> • VOCs using USEPA Method 826013; <br /> • Biogeochemical analyses in accordance with Table 3. <br /> Biogeochemical analysis will be conducted on groundwater samples collected from <br /> select upgradient, source area,transition zone, and downgradient monitoring wells. <br /> The objective of this analysis is to assess natural attenuation processes at the Site by <br /> evaluating biogeochemical data trends within and outside the A-Zone TEPH plume. A <br /> baseline sampling event will be conducted following installation of transition zone <br /> shallow monitoring wells. Future biogeochemical analysis may be completed on a <br /> semi-annual to annual frequency to assess biogeochemical conditions during high and <br /> low water-table conditions.The parameter list may be modified as needed depending <br /> upon the baseline results and biogeochemical analyses may be discontinued once a <br /> set of seasonal data is obtained. <br /> 3. Reporting <br /> Upon completion of the field investigation described herein, as well as follow-up work <br /> that may be necessary to meet the objectives, an investigation report will be submitted. <br /> This report is intended to summarize the field efforts that have been conducted to date, <br /> including those completed as part of the Phase I Investigation. <br /> C'.1D­nts and Seft ngs*bm dt\Lod Sea ngsJT po y Intemet FAes\ContenLOudcokt52S%LSSITha It NP_01_05_09(2).doc 5/6 <br />