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r ii` 0."<v •f,. ^� �f k :��^m :. •r, r a.fY nt 'g- cel; t.�,✓ �. $. -'SYr-,f'7' i'' -rl •,�,.,�: E'rs:"'. 5,: 1st•.; d.• x. .rs it:•c w .`..•..,?. 5 t -..Ya �.. [. yv';n�... ,� .,wr,. a;. 1W ,t .`l, :.;t k' -•-s-: ,•rYr•J� 4 ^ +1_, a` na f W x., '6�'^; ShF �r� 4<m :'u17ks.. ,ry :'fin -zlii S�EcaYd` - - t. • Y on a Record of Well Gauging and Purging and used to calculate the volume of standing water in the well (one well casing volume). Measurements are made to the nearest 0.01 foot and refer- enced to the permanent surveyed reference point on the well casing. A.5.3 Well Purging _ To ensure that the sample collected is as representative as possible of groundwater in the aquifer, standing water in the well and the surrounding sand pack is purged. Between four and six casing volumes of well water are purged to ensure that all stagnant water has been removed. The well is purged with submersible,airlift,or surface pumps or bailers,decontaminated as described above in Section A.6.1. '- Should the well pump dry after the casing is initially dewatered, perp, inQ is discontinued and the well allowed to recover. Purging is continued to obtain the desired purge volume. } A Field parameters of pH,temperature, and electrical conductance are measured as the well is purged. Measurements are talcen and recorded approximately every five gallons. If any of the three field parameters has not stabilized by the time the 4-6 casing volumes have been purged, additional Nvell 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. 4, 1 All purge vaatef is carrtained in 55-gallon druids labeled with well number,date,contents,and facility identification. After the well has been purged of the required volume of water,'the purg- ing equipment is removed_ A Teflon sampling bailer is used to collect four separate samples for -� pxPsample field parameter measurements,to confirm field parameter stability and,therefore, f i f representative aquifer samples. AAA Well Sampling r. , ! j All samples are collected with a Teflon bailer cleaned as discussed in Section AA 1.. The bailer r is operated by hand on a new, 1/4-inch polypropylene rope or on Teflon-coater; stainless steel wire. The sampling personnel wear clean Nitrile gloves during sampling operations and while -< handling sample bottles. The collected groundwater samples are emptied from the bailer with a bottom-emptying device directly into the sample bottles. The samples are collected in either 40-m1 glass VOA vials or 1- a liter amber bottles with Teflon-lined septum caps. The sample bottles contain appropriate pre- servatives, typically hydrochloric acid. The samples are contained in the containers free of headspace(i.e.,no air bubbles in the containers). , i I The containers containing the samples are labeled with the well number,date,location,sampler's initials,and preservative in indelible ink,and the sample labels are covered with clear waterproof -� tape. I e42f11050/.nov/upa A-4 i t