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AEGIS ENVIRONMENTAL, INC. STANDARD OPERATING PROCEDURE RE; GROUNDWATER PURGING AND SAMPLING SOP-7 .� Prior to water sampling, each well is purged by evacuating a minimum of three well-bore volumes of groundwater. When required, purging will continue until either the discharge (T �- water temperature, conductivity or pH stabilize, a maximum of ten well-bore lhe o e volumes the i' groundwater have been recovered or the well is bailed dry. groundwater sample should be taken when the water level in the well recovers to at least - SO% of its static level. ler or stainless The sampling equipment consists of If the sampeither a ling ng syflon atem sVdedic�ated to the well,then) bladder pump with a Teflon bladder. P p yp p the ba`-er is usually Teflon, but the bladder pump is f�Vc with a of ro ylene bladder. In general and depending on the intended laboratory analysis, forty-milliliter {ml) glass, vials, with Teflon septa, are used as sample containers. volatile-organic-analysis (VOA) The groundwater sample is decanted into each VOA vial in such a manner that there is no meniscus at the top of the vial. A cap is quickly secured to the top of the vial. The vial is then inverted and gently tapped to see if air bubbles are present. If none are ct to present, the vial is labeled and refrigerated for deli ery, under stri ul de a uniq�a sample identification� the analytical IaborCtory. Label number, date, a of analysis requested and the number, job identification number, date, time, type sampler's name. quality control purposes, a duplicate water sample is collected from each well. This For qualaboratory. When required,put on hold at the ired, a trip blank is prepared at the sample it laboratory and placed in the transport cooler. It is labeled similar to the well samples, remains in the cooler during transport and is analyzed by the Tabora#ory along with the groundwater samples. In addition, a field blank may be prepared in the field when � , sampling equipment is not dedicated. The field blank is prepared after a pump baler '. has been either steam cleaned or properly washed, prior ri an'K analysisin the next well, a dt is analyzed along with the other samples. The field effectiveness of the in-field cleaning procedures to prevent cross-contamination. To minimize the potential for cross-contamination between ells, all well development properly _ and water sampling equipment not dedicated to a we washed berrween use. As a second precautionary measure, wells are sampled in order of least to highest concentrations as established by available previous analyses. SOP-7/0ct. 1990