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ARCAD[S 2010/2011 Annual <br /> ' Monitoring Report <br /> Union Pacific Railroad <br /> ' Company <br /> Tracy, CA-Maintenance <br /> monitoring wells and piezometers using water monitoring prove or an oil-water Facility <br /> ' interface probe. <br /> The groundwater monitoring wells at the site contains dedicated bladder pumps for <br /> well 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 2010/2011 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 collected when the field parameters stabilized. Purge <br /> water was collected in 55-gallon drums and secured in the onsite Engine House. The <br /> ' purge water will be transported to an off-site, licensed disposal facility by UPRR's <br /> subcontracted licensed waste transportation company. <br /> Collected groundwater samples were analyzed for total extractable petroleum <br /> hydrocarbons as diesel (TEPH-d)using United States Environmental Protection <br /> Agency(USEPA)Method 80156. <br /> In addition,wells MW-14A, MW-15A, MW-22A, MW-26A, and TW-03 were sampled for <br /> biogeochemical parameters. The samples were collected to further evaluate water <br /> ' quality and were analyzed for the following: <br /> Total and dissolved iron and manganese by USEPA Method 6010 <br /> ' . Anions including sulfate, nitrate, nitrite and chloride by USEPA Method 300 <br /> • Nitrogen and ammonia by USEPA Method 350.0 <br /> • Sulfide by USEPA Method 376.1 <br /> Total Organic Carbon(TOC)and Dissolved Organic Carbon (DOC) by USEPA <br /> Method 9060 <br /> + Biological Oxygen Demand (BOC)and Chemical Oxygen Demand (COD)by <br /> ' USEPA Method 410.4 <br /> Inorganics by USEPA Method SM5210B <br /> ' 0 Alkalinity by USEPA Method 310.1 or SM 2320B <br /> Permanent Dissolved Gases(Carbon Dioxide, Carbon Monoxide, Ethane, Ethene, <br /> Methane, Nitrogen, and Oxygen)were analyzed by Microseeps method <br /> AM20GAX, an enhanced version of RSK-175 <br /> ' fref trecy,remairnfecility_A.,Rp1_426-2011.do Page:217 <br />