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' ARCADIS 2009/2010 Annual <br /> Monitoring Report <br /> ' Union Pacific Railroad <br /> Company <br /> ' Former Maintenance Facility <br /> Quarterly—newly installed wells MW-23A, MW-24A, MW-25A, MW-26A, and Tracy,California <br /> • MW-27A(for four quarters) <br /> Wells TW-04, MW-06A, MW-08A, and MW-11A were not sampled during the <br /> November 2009 or the March 2010 monitoring events because free product was <br /> present in these wells. Presence of free product in this area is consistent with historical <br /> observations. <br /> 4.0 Sampling Procedures <br /> Groundwater monitoring and sampling activities were conducted by Blaine Tech <br /> ' Services, Inc. (Blaine Tech). Prior to conducting groundwater sampling, depth to <br /> groundwater or product (if present)were measured to the nearest 0.01 foot in the <br /> monitoring wells and piezometers using an oil-water interface probe relative to the <br /> surveyed reference point at the top of each well casing. <br /> ' The groundwater monitoring wells at the site contain dedicated bladder pumps for well <br /> purging and sampling,with the exception of MW-11A and TW-04.The pumps had <br /> previously been removed from these two wells to facilitate placement of hydrophobic <br /> ' absorbent socks as part of the now-inactive product recovery program.These wells <br /> were not sampled during the 2009/2010 reporting period because they contained free <br /> product.Wells with dedicated bladder pumps were sampled following low-flow <br /> ' sampling procedures. <br /> Groundwater conductivity, pH, and temperature were measured and recorded during <br /> ' well purging. Samples were generally not collected until these field parameters <br /> stabilized. Purge water was collected in 55-gallon drums and secured in the onsite <br /> Engine House.The purge water will be transported to an offsite, licensed disposal <br /> ' facility by UPRR's subcontracted licensed waste transportation company. <br /> Collected groundwater samples were analyzed for the following analytes: <br /> ' total extractable petroleum hydrocarbons as diesel (TEPH-d) using United States <br /> Environmental Protection Agency(USEPA) Method 8015B <br /> ' halogenated and aromatic volatile organic compounds (VOCs) using USEPA <br /> Method 82609 <br /> • TEPH-d with silica gel cleanup (TEPH-d SG) using USEPA Method 3630C (to <br /> assess possible non-hydrocarbon related compounds) <br /> P:V RtMIS Gate�Pm�tttsNf'rveWnion Peclfic Rellmed,RG]®-Teary YeRDNNaedeAGW M1lonllal�c]t000 Tory YeNFwutl GW 200PA1PFIW1L20f621tGNnel <br /> ' P� Page:2/7 <br />