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<br /> AEGIS ENVIRONMENTAL, INC.
<br /> STANDARD OPERATING PROCEDURE
<br /> RE: GROUrIDWATER PURGING AND SAMPLING
<br /> SOP-7
<br /> Prior to water sampling, each well is purged by evacuating a minimumthre well-bore d
<br /> volumes of groundwater. When required, purging will continue until eith e discharge
<br /> water temperature, conductivity or pH stabilize, a maximum of ten well-bore volumes of
<br /> groundwater have been recovered or the well is bailed d
<br /> groundwater sample should be taken when the water level int a well recovers recovers tohen catlleast r
<br /> SD% of its static level_
<br /> The sampling equipment consists of either a Teflon bailer, PVC baiter or stainless steel
<br /> bladder pump with a Teflon bladder. if the sari,pling system is dedicated to
<br /> the bailer is usuallyT he well, t
<br /> Teflon, but the bladder pump is PVC with aof ro lene bladder.
<br /> In general and depending on the intended laboratory analysis, forty-milliliter er (ml) glass,
<br /> volatile-organic-analysis (VOA) vials, with Teflon s
<br /> epta, are used as sample containers. r
<br /> The groundwater sample is decanted into each VOA vial in such a manner that there is
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<br /> no meniscus at the top of the vial. A cap is quickly secured to the top of the vial_ The
<br /> vial is then inverted and gently to
<br /> 9 y pped to see if air bubbles are present. if none are
<br /> present, the vial is labeled and refrigerated for delivery, under strict chain-of-custody, to {
<br /> the analytical laboratory, babel information should include a unique sample identification
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<br /> number, job identification number, date, time, type of analysis requested and the
<br /> sar, pler's name.
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<br /> For quality control purposes, a duplicate water sample is collected from each well. This
<br /> sample is put on hold at the laboratory. When required, a trip blank is prepared at the
<br /> laboratory and placed in the transport cooler. It is labeled similar tc the well samples, }
<br /> remains in the cooler during transport and is analyzed by the laboratory along with the
<br /> groundwater samples. In addition, a field blank may be prepared in the field when 1
<br /> sampling equipment is not dedicated. The field blank is prepared after a pump or baiter t i
<br /> has been either steam cleaned or properly washed, prior to use in the next well and is
<br /> analyzed along with the other samples, The field blank analysis demonstrates the
<br /> < effectiveness of the in-field cleaning procedures to prevent cross-contamination.
<br /> To minimize the potential for cross-contamination between wells,all well development and
<br /> water sampling equipment not dedicated to a well is either steam cleaned or properly a
<br /> i;
<br /> washed between use. As a second precautionary measure, wells are sampled in order
<br /> of least to highest concentrations as established by available previous analyses. )
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<br /> ATTACHMENT/SOP-7/June 19go f
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