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A.6.2 Presampling Measurements lir. of each well,the depth to standing water and the total depth of the prior to purging and sampling robe. A decontaminated,clear acryl- well are measured with a decontaminated op[ical interface p and removed to confirrn is bailer is then inserted into the well to just Thesow e resempleic ameasureter lrnen[tiata are recorded ter in the presencelabsence of any floating product. 10 calculate he p on a Record of Well Gauging and Purging and are made to he nearest 0.41afoot ndarefer- the well(one well casing volume). Measurements enced to the permanent surveyed reference point on the well casing. ' A.6.3 Well Purging collected is as representative as possible of groundwater in the aquifer, To ensure that the samplepack is purged. Between four and six casing standing water in the well and the surrounding sand p volumes of well water are purged to ensure that all stagnant water has been or bailers,decontaminated as d scribed above pu.ged with submersible,airlift,or surface pump in Section A.6.1. ump dry after the casing is initially dewatered,purging is discontinued and the Should the well pEain the desired purge volume. well allowed to recover. Purging is continued to ob eters of H,temperature, and electrical conductance are measuredfive gallons. if any of the s the well is Field parameters P purged. Measurements are taken and recordehd approximately asin every volumes have been purged, three field parameters has not stabilized by g additional well water is pumped until the parameters have stabilized(but no more than 10 casing volumes). "Stabilized"is defined as a reading less than 10 percent of a previous reading. water is contained in 55-gallon drums labeled with wellvolume date,contents, purg- Ali purge w ed of the required for facility identification. After the well has been purged is used to collect four separate samples ing equipment is removed. A Teflon sampling P resample field parameter measurements,to confirm field parameter stability and,therefore, representative aquifer samples. A.5.4 Well Sampling . ion AA 1. The are collected with a Teflon bailer cleaned aTdiscussed ieeor on TefSlontcoa ed stainless bailer All samples ro lene p is operated by hand on a new, 114-inch polypropylene sampling operations and while wire. The sampling personnel wear clean Nitrile gloves during handling sample bottles. roundwate:samples are emptied from the bailer with a bottom-emptying device - ----. -The collected g o -- lass VOA vials or 1- directly into the sample oottles. The samples are collected.in.either 40-ml g A-4 .=919M"