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66/27/2663 69:47 2698325'l WRIGHT ENVIRONME` `j_ PAGE 64 <br /> %owl %.001 <br /> Page 3 <br /> Trust for Mary Gardella <br /> jwe 26,2003 <br /> and cherr&al data will be diys;ussed with PISS EHI=D and used to locate <br /> i"he boring with espec� regard to the <br /> additional groundwater rnanato�rix►g wells far site monitoring <br /> potential 1, 2-DCA, pathways. This mi►y include dfillixtg "cluster" wells sets at locations <br /> selected on the basis ofWis additiorW CPT data. Pro osed ounciwater <br /> • once the well locations are :agreed, permit and install the initially p p � <br /> moWtOring wells. The well locations proposed in the initial workplan tray be rev!md. on <br /> the 1414 of the new data. The got*1s�., terest and more fully identify eonta;ninat►t to <br /> unprovide site definitivn in l <br /> monitoring of the three water`bearing za <br /> pathways. <br /> • When the well locations are selected, Wright will review the feasibility of using a nroltiple <br /> level monitoring well. These wells may monitor strata at several depths use sp=iWty <br /> drilling equipment and well design with very discrete slotted intmals and lo-Wized <br /> bentonite Tracker seals. It is Wright's opinion that the initially proposed well desk,us are <br /> usable and that should data mdwate groundwater pumping is neP..ded for dissolved.plume <br /> Wntpul installing larger diameter (4-int h diameter weld) may be needed for deep well <br /> instaUations for dual mormitorinig and pumping use. <br /> Proposed Addendum l aterim Remediation and Source Removal <br /> Potential Bmuried Source <br /> PHS EHD indicated during our meeting that some intorim cleanup is desirable at this time, with <br /> the understanding that site subsurfaee clauac-tctization is ongoiu[g. The:ite pruporty is ver :small <br /> and Wright does not desire to damage exLqting monitoring wells. We believe interim rem Ration <br /> activities mug address possible buried sources to confirm or eliminate presence as de;'Cribed <br /> below. <br /> A rnagrretic: survey to detect metals found wiomalim that wuld indicate buried drums Ju the <br /> backfi>l0d. excavation (Ramage 2443). The final disposition of excavated soils from the 1"ormer <br /> tank pit is not clear from project reports reviewed. it is possible that contaminated so.3s and <br /> dn= containing soil or ground water/product have been placed in the fbrmer excavation. if <br /> present, bails and leaking drums could be a continued sourm:e of coutcuzxbaWion. In ru onion, <br /> buded drums could present a safety hazard during drlllirtg or remediatioan and cons# tion <br /> activities. Wr*bt believes it is prudent to verify the nature of the anormliv5 found in the m sgnetic: <br /> survey before proceeding with any drgling activities. We will perform;a.ftroughale search and <br /> record ftview ,and evaluate the weed for additional geophysical survey and/or hand prof-ling to <br /> pinpoint the location of drums. Should drums be found an excavation in.the former tank irk area <br /> would be required to remove and dispose of the drums before proceeding with additiong well <br /> installation? <br /> N;e 3 0£6 <br />