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0- <br /> Frontier Transportation, Incorporated <br /> 425 Larch Road Page 2 of 2 <br /> Tracy, California 95376 September 20, 2013 <br /> • Collection of two groundwater samples for analysis from each zone per pumping well <br /> (one collected following the removal of four well-water volumes, and one collected at <br /> the conclusion of the pump test); <br /> • Analysis of the groundwater samples for total petroleum hydrocarbons as gasoline <br /> (TPH-g), and volatile organic compounds that include: benzene, toluene, ethylbenzene <br /> and total xylenes (BTEX); methyl tertiary-butyl ether (MTBE), ethyl tertiary-butyl ether <br /> (ETBE), di-isopropyl ether (DIPE), tertiary-amyl methyl ether (TAME), tertiary-butyl <br /> alcohol (TBA), ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA); and <br /> • Assessment of the effects on DPE1, DPE4, DPE11, MW-21, MW-22 and MW-23 <br /> during the water pumping test. <br /> Although EMS has indicated in email correspondence dated 06 September 2013 to the EHD <br /> that the temporary inflatable packer will not prevent flow of water through the filter pack from <br /> entering the casing, EMS has assured the EHD that "the amount of water that flows through the <br /> filter pack compared to the water that normally flows through the casing without the packer is <br /> very small'. EMS further states that the proposed pump test is very cost effective in collecting <br /> information to be used in the design of the proposed groundwater pump and treat system. <br /> The EHD approves the work plan as modified by the addendum. Please notify the EHD of the <br /> pending pump test dates so that an inspector can be present for the fieldwork. <br /> If you have any questions, please contact Vicki McCartney at (209) 468-9852, or by e-mail at <br /> vmccartney@sjcehd.com. <br /> Sincerely, <br /> l/ic�G rL'/l <br /> Victoria L. McCartney, REHS 'yw/ <br /> Senior Registered Environmental Healt Nuel C. Henderson, Jr., PG <br /> pecialist Engineering Geologist <br /> c: Mr. Javad Masoudi, PE, EnviroMonitoring Services, 23011 Moulton Parkway, Suite B-14, <br /> Laguna Hills, California 92653 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley <br /> Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />