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ARCADIS Mr. Eric Rapport <br /> April 21, 2011 <br /> Background and Site Description <br /> On June 30, 2007, a train derailment resulted in the release of ethanol from a tank car <br /> with the approximate capacity of 30,000 gallons and canola oil from a tank car with <br /> the approximate capacity of 25,000 gallons. The release occurred on the down-hill <br /> slope of the tracks (Figure 2). <br /> The Site is defined by the down-hill slope (south of the derailment)where the release <br /> occurred, the Storrie Resort(property and driveway), a small section of Highway 70, <br /> and the Feather River(Figure 2). The Storrie Resort (consisting of a primary <br /> residence, garage, shop building, storage building, and three rental units [Rental Units <br /> 1 through 3]) is located along the north side of California State Highway 70 and <br /> downhill from the derailment location. Three perennial streambeds (the western, <br /> center, and eastern)flow across the property(Figure 2). <br /> Groundwater Monitoring and Sampling <br /> Monitoring Well Network <br /> Fifteen groundwater monitoring wells (MW-01, MW-03A, MW-03B, MW-04B, <br /> MW-05A, MW-05B, MW-06, MW-07A, MW-07B and MW-08 through MW-13) have <br /> been installed to assess groundwater quality beneath the Site. Well construction <br /> details for the groundwater monitoring wells are provided in Table 1. <br /> Groundwater Monitoring <br /> The first quarter 2011 groundwater monitoring and sampling event was conducted <br /> during January 17 and 18, 2011. <br /> Blaine Tech Services, Inc. (Blaine Tech) measured depth to groundwater at each of <br /> the 15 monitoring wells and the on-site domestic well to the nearest 0.01 foot from the <br /> top of casing on January 17, 2011. Copies of the field notes from the first quarter 2011 <br /> monitoring and sampling event are provided in Attachment 1. <br /> Groundwater Sampling <br /> After the depth-to-water measurements were recorded, each groundwater monitoring <br /> well was purged using a clean 2-inch diameter submersible pump while monitoring <br /> pH, electrical conductivity, oxidation-reduction potential (ORP), dissolved oxygen <br /> (DO), temperature, and turbidity with a flow through cell (YSI multi-parameter meter). <br /> 1\Arcadis-us\officedatalFolsom-CA\Aproject\UPRR\RC000738-UP RR-StorrieTeliverables\QuarterlyReports120111Q1-2011VIinaltedlQ-2011Storrie Status Rpt(4-21- Page' <br /> 11).doc 2/9 <br />