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99 AEGIS ENVIRONMENTAL, INC. STANDARD OPERATING PROCEDURE RE: GROUNDWATER PURGING AND SAMPLING SOP-7 Prior to water sampling, each well is purged by evacuatingoom continue until either the dischargemum of three lof - volumes of groundwater. When required, purging water temperature, conductivity or pH stabilize, a maximum of ten well-bare he°pracotlical� the groundwater have been recovered o the well is bailed dry. groundwater the water Isvel in the well recovers to at least sample should be taken when 8D%of its static level. �- The sampling equipment consists of either a Teflon baiter,em sVdedicated to the well,theer or stainless m bladder pump with a Teflon bladder. It the same 9 Y bladder. but the bladder pump is PVC with a polypropylene the bailer is usually Teflon, anal sis,fort✓-milliliter (ml) glass, In general and depending on the intended laboratory Y volatile-organic-analysis (VOA) vials, with Teflon septa, are used as sample containers. e is The groundwater sample is decanted into is quich ckly secu ed to the op of thein such a manner avial. The no eniscus at the top of the vial. A cap is qu Y resent. it none are vial is then inverted and gently tapped to see if air bubbles are p resent,the vial is labeled and refrigerated forshould include aundery, eun unique sam p Label information ple identification the analytical laboratory. a of analysis requested and the number, job identification number, date, time, type sampler's name. control purposes, a duplicate water sampled a triptb blank s prepared at the from each well. This For quality p When required, a trip sample is put on hold at the laboratory. laboratory and placed in the transport cooler. It is labeled similar to the well s y along h the remains in the cooler during transport and is analyzed by the a oor to field when groundwater samples. In addition, a field blank may e prepared ld blank is prepared after a pump bailer sampling equipment is ndedicated.rrperly�washed, prior to use in the next well, and is has been along steam cleaned analyzed along with the other samples. The to field prevblank ent ossycon amination. tes the effectiveness of the infield cleaning p l well development and To minimize the potential for cross-contaminationowe ll ,S eitherr sten wells, am cleaned or properly water sampling equipment not dedicated led in order washed between use. As a second eco nsprecautionary r bushed by a vailable Prl®vio s analyses. of least to highest concentrations t - ------:� -------------APPENDIXISOP-M-6 5990