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_- .• . - -. -- �, - _ - fir` - � - 15 June 1999 ` AGE-NC-Project.No. 98-0534 Page 11_of-1'3 7. protocols, detail's of whicharepresented below. #. f ', ' .4 4.3.1. Static-Water Level Measurements Before sampling and during quarterly ground water manitonng; static water-level and-free-product' thickness will`be-measured..using an electric oil/water level indicator. Water_.ievel data'will be, . r- recorded to the nearest 0.01 Riot from a reference poinfmarkedbf:the top of the PVCrwell=casing. .' Before and after each use;the electric oil/water level indicator will be washed in an- Alcobox solution .- _ _ and rinsed with water. 4.3.2. Well Evacuation - - - ._ . .-• .. -` - :-. '°. .._ -. x ice` _ ., y. -. ;:.�. - T - Subsequent.to measurement of-Moth to water and prior to:sainpling,,the well will be purged using `o- T -a submersible pump to ensure that-the-groundwater-sample is:representative.of the formation, Tattier ' s than water standing in the well:casing. The well will be purged until: 1) a minimum of.three-casing' `- � -volumes isremovedfrom`the well;'and/or..2).the field-mi-e- ground water-.par'meters pH, ; temperature and,electrical conductivity have stabilized. However, if a well is purged dry prior to txs evacuating three casing volumes,,a ground water sample will be collected following-80.perceni.. recovery'of groundwater level'within the well or within$hours of well-evacuation ,.. .i Purge water;free-product, and decontamination waterp+ener ted=durin the g round water sam lin h Y g P g g p g . - activities will be contained in:DOT�approved_drums which wihl be appropriately labeled for storage. Drums containing purge water will stored on-site pending_appropriate removal and,disposal: , - n _ :, r 4.3.3. 'Sample.Withdrawal - - - Water samples will be collected from.the monitoring wells using disposable polyeihylene:bailer. These bailers are disposed of after one_use and require no decontaminating;thereby minimizing cross contamination due to sampling devices. Samples will-be'drawn and collected in'such a.manner'that '. ' agitation and'exposure of the groundwater to the atmosphere is minimal. Sample containers will be: filled-using-the appropriate disposable-sampling attachment which allows controlled flow out of the �.:. bottom of the bailer by liftinp . u on-the check valve. ± g . y 4'.3.4. Sample an r _ n -' Ground water'samples will be,collected into laboratory.supplied containers. Ground water-samples f °AdrancedGeoEnVironmenISI,Inc. .