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ARCADIS <br /> Infrastructure, environment, facilities <br /> ARCADIS G&M,Inc. <br /> Mr. Perry Myers 1670 Corporate Circle <br /> Department of Toxic Substances Control Suite 200 <br /> 8800 Cal Center Drive Petaluma <br /> Sacramento, CA 95826-3200 California 94954 <br /> Tel 707.776.0865 <br /> Fax 707.776.0850 <br /> Subject: <br /> Additional Groundwater Investigation www.arcadis-us.com <br /> Tracy, CA—Former UPRR Tracy VCA, Tracy, California <br /> Dear Mr. Myers: ENVIRONMENT <br /> ARCADIS is submitting this work plan Grab Groundwater Sampling and Monitoring <br /> Well Installation, UPRR Tracy VCA, Tracy, California on behalf of Union Pacific <br /> Railroad (UPRR). Investigation and remediation work are being conducted under a <br /> Date: <br /> Voluntary Cleanup Agreement with the California Department of Toxic Substances 11 July 2008 <br /> (DTSC), as signed on June 23, 2005. ARCADIS is providing oversight of soil <br /> excavation activities in Operable Units OU-3 and OU-4. The results of pre-and post- contact: <br /> excavation soil sampling and analysis are showing poor correlation between total and Scott Davis <br /> soluble lead. ARCADIS proposes collection of shallow groundwater samples from <br /> OU-3 and OU-4 to assess whether lead has leached from the OU-3 and OU-4 vadose Phone: <br /> zone soils into the shallow groundwater and excavation activities have reached limits 707.776.0865 <br /> that are protective of both human health and groundwater. Summarized below are the Email: <br /> proposed groundwater investigation procedures. scott.davis@arcadis-us.com <br /> Proposed Field Investigation our ref: <br /> RC000721.0001.0014 <br /> One GeoProbe®will be advanced in Operable Unit(OU) 3 and three GeoProbes®will <br /> be advanced in OU-4 as shown on Figure 1. The locations of the GeoProbes®were <br /> chosen to provide sufficient spatial coverage of the two OUs. The GeoProbes®will be <br /> advanced in accordance with the Sampling and Analyses Plan Former Tracy Railyard, <br /> Tracy California which is included as Appendix A in the Remedial Investigation Work <br /> Plan Former Tracy Railyard, (Kennedy/Jenks,August 23, 2005). Prior to beginning <br /> field activities all necessary permits will be obtained from San Joaquin County <br /> Environmental Health Department and subsurface utility locating will be completed. <br /> The GeoProbes®will be advanced approximately five feet beneath the encounter of <br /> first groundwater(approximately 10 to 15 feet below ground surface [bgs]). A <br /> temporary well will be placed in the open borehole to allow formation water to enter <br /> into the well screen. The temporary well will be a pre-packed (with silica sand)1/4 <br /> polyvinyl chloride(PVC)well with five feet of screen. Samples will be collected from <br /> the temporary wells using a peristaltic pump and dedicated tubing. <br /> Imagine the result <br />