CORRESPONDENCE_1984-1989 - Laserfiche WebLink

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• ., .,,eta.. - � -- -- AUG c��'S� i4:5Q `t1C1( P.5/6 CLOSURE CONDITIONS Forward, _inc. A revised sampling and analysis plan, must be submitted within 30 calendar days of closure approval, which lists the new sampling team, equipment, handling techniques, and certified laboratory. This revised plan must address the following parameters: • Silver • Endrin • Lindane • Methoxychlor Toxaphene • 2,4-D 2,•4-5 TP Silver Monthly groundwater contour maps must be constructed. These contour maps should have the waste management units illu.-Arated for reference. Ir for any month, a contour map shows influence from sources other than those discussed in the R.NOD, a report mur ` be submitted to identify and discuss possible sources within 45 days after identification. If a vertical diffexentiai head greater than 4.25 feet is found at paired wells on-site, a report rust be submitted within 45 days that includes reviFed fluw nets and a detailed discussion of the possible causes for the differential head. - A workplan must be submitted to DHS for review*, within 60 calendar days of Closure Plan hpp-roval, that describes how the following tasks will be accomplished: 1) Definition of aquifer characteristics and degree of interconnection between the lc:oer and upper zones of the uppermost aqui ter. 2) Replacement of wells that de not provide acceptable samples and measurements thrcuyhout the year. 3) Construction of at leant one additional downgradient groundwater monitoring well to augment the unmonitored , area downgradinnt cf the hazardous waste management unit in the northeast corner of the site. 4) Determination of approximate groundwater flow rates. A more extensive cnnf rmatior, plan and schedule must be submitted if w<-ste is fcun9 :r•.:tside the wilste man<jr-je,:ent unit.