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<br /> 3.2..3 GROUNDWATER SAMPLING
<br /> eneral monitoring well sampling procedures .'ire described hcicw;Weil installation
<br /> The g
<br /> procedures are described in Section 4.3. Sampling procedures �►re as fol ows:
<br /> that it is properly decontarnin�ttcd as
<br /> Check all equipment to ensure
<br /> desrril;c.i in Section 4.3.3.
<br /> Determine the static water level, using an electronic sounder.
<br /> Clieck for light, nonaqueous phase liquids (e.g., g,,soline) by collecting tl
<br /> sample of the upper l to 2 feet of liquid in the well with a clear acrylic
<br /> bailer.
<br /> Calculate the water volume in the casing based on the static water level.
<br /> Purge the well using a submersible pump or
<br /> `rind temperaer Itgeciit 'ate t
<br /> will be measured for electrical conductivity, p
<br /> p
<br /> ll will he purged until mnnimumuof
<br /> vity Is
<br /> once per well volume. The we
<br /> three
<br /> stable within 10 percent and the pH within 0.20• Atem 'r�ture, and
<br /> well volumes of water will be purged. if conductivity, p
<br /> PH have not stawilills will ter purged dry u and Tallosvedpto le W`cnverll be ttwice,
<br /> Slow recovering �v
<br /> then purged and sampled when sufficient water has accumulated in the
<br /> well.
<br /> Temporarily store the purged water onsite pending disposal. Doll
<br /> a
<br /> Collect water samples for organics from the pump discharge or with a
<br /> r
<br /> • t
<br /> teflon or stainless steel bailer- Discharge he first two bailers of well
<br /> water. The third and 3ubseyuent bailer will be transferred to clean sam-
<br /> ple containers. .
<br /> When collecting the water samplrs for volatile organic analysis, the sam
<br /> or with a ba-Iter with a bottom
<br /> pie will be filled from the pump discharge ler w
<br /> emptying valve filtil1bees gross thraughltheosamplel as thle battleled to ,is being kfiled
<br /> that no air bub p
<br /> The bottle will be sealed so that no air bubbles are trapped.
<br /> cording to
<br /> in
<br /> d . The containers will be eale.4 1 Land shipped tolthe claboratory fo ran fy-
<br /> custody procedures Se
<br /> X15.
<br /> All relevant field information will be recorded in f field notebook (end
<br /> instrument calibration, well designation, volume of water extracted, and
<br /> tune of sampling).
<br /> 3-5
<br />
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