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c S <br /> ARCADIS RECEVED <br /> Infrastructure, environment, buildings ARCADIS U.S., Inc. <br /> ZO i0 1410 Rocky Ridge Drive, <br /> Suite 330 <br /> ENVIRONI'IENT HEALTH Roseville <br /> PERMIT/SERVICES California 95661 <br /> Tel 916.786.1871 <br /> Mr. Richard A. Paulson Fax 916.786.0366 <br /> Project Manager www.arcadis-us.com <br /> Schack & Company, Inc. <br /> P.O. Box 339 <br /> Tracy, California 95378 <br /> ENVIRONMENT <br /> Subject: <br /> Response to January 29, 2010 letter regarding 11th Street East Tracy OH Bridge <br /> Project— Utility Notification Letter"A" <br /> Date. <br /> Dear Mr. Paulson: 26 February 2010 <br /> This letter was prepared in response to your January 29, 2010 letter requesting Contact: <br /> locations of monitoring wells associated with the Union Pacific Railroad (UPRR) James E. Eisert <br /> Former Tracy Maintenance Yard which is located in the vicinity of the 11th Street East phone: <br /> Tracy OH Bridge Project. 916.786.1871 <br /> Figure 1 (attached) shows the well locations near 11th Street and MacArthur Drive. Email: <br /> The wells are generally constructed with 2- or 4-inch diameter polyvinyl chloride james.eisert@ <br /> PVC piping and are completed at the surface with either a "stove—pipe" stick u arcadis-us.com <br /> (PVC) P�p 9 PP <br /> with protective bollards or flush-mount well vaults. The wells, identified in Table 1 and <br /> Our ref: <br /> Figure 1, are completed to varying depths. The maximum depth is 82 feet below RC000709.0601.00023 <br /> ground surface. Construction details are provided in Table 1 (attached). In addition to <br /> the monitoring wells, the extraction wells (EWP-17, EWP-18, EWP-19, EWP-20, and <br /> EWP-21) are connected to 2-inch diameter PVC piping that is installed subgrade <br /> between the wells and then to the engine house located south of the railroad tracks. <br /> The approximate location of the underground piping is shown on Figure 1. <br /> Monitoring wells (MW-15A, MW-15B, and MW-15C) are sampled annually. <br /> Monitoring wells, as well as piezometers (designated with P or PZ), are monitored for <br /> groundwater elevations semiannually. Extraction wells (designated with EWP) are <br /> not used at this time, but may be used in the future. <br /> Imagine the result <br />