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. -- �`- ,�.��$' ,."��.��.. -.�fa�z.a.Asan.s�"5��.'"ra-a�a+s,r�s.�a�+�+.-- �..��'�`" "'"'•idd.'.�T AEGIS Et4VInONtAENTAt., INC. S-rANDAI11D OPERMING PrIOCEDUnE BE: GROUNDWATER PURGING AND SAMPl.NG SOP-7 r lin , e3c:n Yd[il rs purr by c:acuat�ng a ntininium of three vrG:l-ucirc Prior to Watcr ,1rrip tolur'rtc of groundwater. �`lnen rcc,�,:�rCri. purg ng unit continue antil eithf:r thr. disc,.arrr; vraier temperature, conductivity or pl-i stab;li.c, a rn,1XIM m of ten rrell•brare �Qlumes of grourid.water haw: been recovered cr the v+r 1l is bailed dry. When practical, the groun(i.eiater sample should be taken when the virziter level in it'kf''::wt! recovers to at least 80 , of its Static level. The: sarrlcling eq uiprctent Cc 0*, t,rlher a 'I ellon t; sler, PVC bailer or stainless steel with a Telion bladder, it the cap;Eng Systems i:,d blvddc r PUMP medicated to is f'VC Frith a polyprcpy�etrC bladder. the baler is usually Teflon, but they bladder pump las,, In general and depending on :he intended lalscratpry analysis, rorty rrtiiltliter rnE) g vele tine organic analysis NO vials. firth TCficn septa, are used as sample containers. that .. !h+,:re is The yrc;rridwater camp"e is dec;intcd olO €aYl1 VOA vi, in such a mannof er no meniscus at tho top pf the vial. A Cap i q quickly ccubube'-0rt Lpree nt tt1f njc one Tare vial is then inverted and gently tapped10 present, the Vial ss labeie ands information Should nG stfr aeu qUe r strict e rle ids iGca't�icn refrigerated for d0ivvi"Y the analyticJ1 laboratory number. job identification number, date, t me. type of ar'.-'yVs requested and the sampler's name. For q.jatity control purposes, a duplicate'•rn cf sample is cc icc ed fro'.11 each1"ut Thi sample i:: put on hold at the laboratory. wtxn required. a ,rip blank is prep`2r� laboratory and placed in the transport cooler, It is labeled simi'ar a laboratory wellalonwith the remains in the cooler during transport and is analyzed by in the field when groundwater samples. In addition, a field blank maY to prepared or bailer sampling equipment is not dedicated. after a ml (e!d blank is prepared washed. pre to use in the nextVViell, and is has been either stear�a cleaned or props y analyzed along with theother c ane samp!es. The *s lc 1prevlent c ossank -corp sis ami nation tes the effectiveness of the in-fieldg To rn',nimize the potential for cross-ccnlnmination between wells, all well development and vlater sampling equipment not .dedicated to a vied is either steam cleaned or properly washed behveen use. As a second precautionary measore, .,velli are sampled in order of least to highest concentrations as esmbl;shed by ave=lade previous analyses.