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m4LE'r 0*' )ttNG TOWtR CO(VAIO -2- <br /> $URiACL IMPOUNDMENT CLOSURE AND <br /> PO ,(-CLL SURE PLAN AMG <br /> CI nft;NT AkX PLAN <br /> Sa + JOAGuIh ZWNTY <br /> 1, Atia , :ion4I rite vi*cismGnt work ( Endangerment Assessment, feasibility <br /> ,troy , dvvrlipn,ont of ARAAs) must consider potential beneficial u1e3 1n <br /> 110Jlllu+r W V, rsant utas of grouno water. The orrte�ologne Water Quality <br /> A_t requl ,41,i, oro i-ac Lion of both W'Li,al and potential uses. Since removal <br /> of S+ : , .,: t.ot• o• for traatnwnt affects 00119f1clal uses (water cannot be used <br /> if it is (IoL '.here) , replenishment of the aquifer must be included in <br /> ocvclopirent ni Die ARAAs and itasibility Study. <br /> Jurm,l ,:JntacL with yround' wstwr Is another potential exposure route (page <br /> 1-5) that to be considered in the Endangerment Assessment. The <br /> a,, site tall ccr.tribution to Around water contamination (leaching effects <br /> ,,,d poLentiali Is another dots 900 (page 3-25) to be included 1n the <br /> Ennangennant Asses&,wnt. 4. <br /> 3. 1 1 ill lava thr same concern regarding separation of proposed MOltiiIF11 .. <br /> well screen intervals discussed in our 25 November 1987 eomaeitt .ta , �. <br /> importaat to sampie separate aquifer zones to obtain tha most. Mlriningfvj <br /> results. Alsop as discussed in our 25 November cwmnte, not filetailing a <br /> shallow Zone well 1n the initial cluster leaves a date gap. f will agree$ <br /> however6 that the necessity of a shallow zone well can be decidedafter the <br /> initial data hes boon collected. <br /> A. It it assumedb since it Ss not ttatao, that all wrLllt wilt M dbYeloped by <br /> air surging os in the past. <br /> 5, Now walls should Ge sd,npled initially for Arsenic and Copper to maintain <br /> beckgroLmd da Le. <br /> t . S es need to be collected as composites or eerier grebe u <br /> 2 October 3967 comments. Additlonallys ee <br /> it sppre that <br /> e ditches along Coolidge. Carrel. Oa . end M401x <br /> t no storm water sampling 1e proposeQ for these pointe. <br /> 0% Pewrigms at these points? If so. sampling needs to be <br /> performed. <br /> 7. The oct*41 data and documentation for the 16 to It January 1968 aquifer <br /> testing di Cussed in the Workplan needs to be outuaitted to our office. <br /> sg <br /> ct: Jim A,.Ltr,ang, Department of health Services, S.cramento <br /> r <br /> I <br /> I <br /> S ' d 81 :E1 88i0E/vo woad <br /> 9 i 0L9CZ9C E :Wd LZ:b :e6-6Z-1, 96Z H31d0031K XOd3X <br />