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ARCADIS Mr. Eric Rapport <br /> April 26, 2011 <br /> average of values calculated for previous years, a detailed assessment of <br /> groundwater data will be conducted to identify possible underlying factors that may <br /> be adversely affecting the continued effectiveness of MNA. This assessment shall <br /> include analyzing groundwater biogeochemical parameters from the monitoring wells <br /> to investigate potential changes to the conceptual site model and viability of MNA as <br /> a remedy. It may include evaluating the monitoring well network and monitoring <br /> program. Supplemental actions will be considered and suggested to the RWQCB as <br /> appropriate. <br /> Closing <br /> If you have any questions regarding this correspondence, please contact James <br /> Eisert at (916) 786-1871 or at James.Eisert@arcadis-us.com. We look forward to <br /> your response. <br /> Sincerely, <br /> ARCADIS U.S., Inc. <br /> Jennifer L. Nyman, PhD <br /> Senior Remediation Specialist <br /> James E. Eisert, PG (No. 7000), CHG (No. 779) <br /> Principal Hydrogeologist <br /> Senior Project Manager <br /> Attachments: <br /> Figures 1 to 12 Hydrographs with Benzene and Ethanol Concentrations over Time <br /> Copies: <br /> Mr. Loren and Mrs. Rhonda Perkins <br /> Mr. Jim Diel, Union Pacific Railroad Company <br /> Mr. Bob Bylsma, Union Pacific Railroad Company <br /> \\Arcadis-us\officedata\Folsom-CA\Aproject\UPRR\RC000738-UPRR-Storrie\Deliverables\MNA-Implementation Plan RTC\Storrie_MNA- Page: <br /> IP_RTC(4-26-11).docx 4/5 <br />