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V <br /> ARCADISBBL Ms. Victoria McCartney <br /> October 19, 2007 <br /> ...EHD believes a reduction in collecting groundwater samples from MW-5, <br /> MW-7, MW-8, MW-13, MW-14, and MW-17 from quarterly to annually appears to <br /> be adequate to track the plume and will approve such a reduction if requested. <br /> The SJCEHD did not approve ARCADIS BBL's recommendation to destroy <br /> monitoring wells MW-5, MW-7, MW-8 and MW-13 due to traffic hazards during <br /> sampling, but did suggest a reduced sampling frequency for the wells listed above. <br /> Therefore, ARCADIS BBL is requesting the following modifications to the <br /> groundwater monitoring and sampling program: <br /> • Continued quarterly monitoring of groundwater levels from the entire -V <br /> monitoring well network <br /> • Monitoring wells MW-3, MW-15 and MW-15D will be sampled on a quarterly � <br /> basis <br /> ro� <br /> • Monit .r Pg wells MW-5, MW-6 MW-7, MW-8, MW�13, MW-14;�M 1W and r�, <br /> MW-17 will be sampled on an annual basis;,--' <br /> asis <br /> • The list of p alytes f�monitoring wells MW�7,`MW-8, MW-14, MW-15ff, G <br /> iq <br /> MW-1 5D-,and MW-17 will include total petroleum hydrocarbons in the <br /> gasoline range(TPH-G),total petroleum hydrocarbons in the diesel range tV�s <br /> (TPH=D), total petroleum hydrocarbons in the motor oil range (TPH-MO), <br /> benzene, toluene, ethylbenzene, and total xylenes(BTEX),rnethy_I tertiary <br /> butyl ether(MTBE)and tertiary butyl alcohol (TBA) <br /> • The list of analytes for monitoring well MW-3 will include 1,2-dichloroethane °`' <br /> (1,2-DCA), TPH-D and TPH-MO U <br /> ISS -0 <br /> • The list of analytes for monitoring wells MW-5, MW?ff,�MW-144and MWA6 <br /> will include TPH-D and TPH-MO <br /> i <br /> The sampling and analytical methodologies will remain consistent with previous <br /> events and the samples will continue to be submitted to Lancaster Laboratories of <br /> Lancaster, Pennsylvania. <br /> EHD believes that MW-15 and MW-15D need to be redeveloped, using potable <br /> water if necessary to flush debris from the well screens, and directs this to be ' <br /> done prior to the next sampling event. <br /> Page: <br /> 2/3 <br /> 010oo—ts and SeNngslaWor%Lx I Setlirgs\Temporary Intemet Res\OLK 00557 Response Letler.dx <br />