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, Mr SlevenBxbc,n ��� '! ��� 11 No,omber2OO7 <br /> . xhAEP Holt Release Site. Holt <br /> about 10 feet away from N-17 An increasing benzene trend is observed in both of these wells. <br /> KMEP believes the increase in concentrations is because W-17 is no longer pumping and <br /> Pulling in clean water from offsite, which was diluting the benzene concentrations- KK4EP <br /> believes !hat the benzene concentrations will come to equilibrium and starl 10 decline soon. <br /> Qvens|i KMEP believes that monitored nalora| attenuation (M,.,/4A) is effective at the Site. The <br /> Pilot Study Rep0rl concluded that NINA /soccurring and that ohvhorernedial/onwill enhance <br /> ihe reduction of hydrocarbons in the sohsur-tacc. The Pilot Study Report oconronenda the <br /> following changes tOthe Monitoring and Reporting Program (k3RP), <br /> " <br /> Reduce surnp]ngfrequency toa*rni-anrumi <br /> * <br /> Remove select upgradiemtwells (M-1. k4-2. and M-3) and deep wells (N-21. N-22. N-?3. <br /> and N'24| tOnn �he MRP, <br /> ' ' <br /> ° Birninate ouroen( annual monitoring program for methyl tertiary butyl ether (MTBE) and <br /> terl bUtyl alcohol (TBA) because these compounds are related to background <br /> concentrations inTrapper 8iough, <br /> , <br /> Flin-iinate the MNA general chemistry analyses that were added to the MRP for the <br /> bioremediation pilot study,, and <br /> � <br /> Adjust the cunen( senni-annua} reporting periods ho/nbuudh/hnstquade/ arid <br /> second/third quarter tohrsKsecVndquarter and third/fourth quarter. <br /> KMEPsubrnittedthe Work Plan todescribe the methods tobe used to destroy 10 SVE wells <br /> (5VE-1 through SVE'10) and four deep groundwater monitoring wells (N-21 ihrqu8h N-24), <br /> KMEP discontinued operat,on of the �SVE wells in 2004 and removed the aboveground <br /> portions ofthe 3VETSsystem in2OO5, The 3VEwells are nnlonger necessary because <br /> future nerned/aU0n will be via MNA, KMEP believes the deep groundwater monitoring wells <br /> are nolonger necessary because 'hey have beer) consistently below detection linnitx. <br />� The /\nnwa| Flopod summarizes the groundwater data ouUentod in 2OO7� Groundwater <br />� <br />� e|evatmnsdoc|inedin2OU7becausemJ1heabno^nm||ylovvpveoiphadon. butQnzundvvo&srf|ovv <br /> patterns were to the southeast, which is consistent with historic monitoring data TPH as <br /> gasoline ([Pl-ig) and benzene were not detected in Upgradient wells or shallow downgradlent <br /> vwaUa. Deep wells wexe also bo/Ovvdetection hrnita, with the exception o| N-24 N-24 <br /> contained benzene and TJPMQ at 47 micrograms per liter (pg/L\ and 110 ug/L. respectively. <br /> These are the highest concentrations inthis well since 2O05. <br /> Our comments are presented be/ow� <br /> I Regional Water Board staff concur with the conclusion in the Pilot Study Report that <br /> MNA iuoccu:ing. <br /> 2 Regional Water Board staff reviewed the recommended MRP revisions and prepared a <br /> draft MRP for your review and comment, By2GNovember 2007. please review the <br /> attached draft MRP and provide any comments. Changes to the existing MRP include <br /> the hD||0xv|ng: <br /> w The sampling and reporting frequency isreduced <Psenli-aDnU@t and the reporting <br /> periods changed (nfirst/second quarters and third/fourth quarters, <br />