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I rl l"r ni <br /> <I <br /> —Section No '11 <br /> ' i S .. 1 to ' l 1 h ,� 1 ,,•f , , y ., <br /> r Revision' ,No_T 0 <br /> „ Date `�, September 5, 1991 <br /> ! Page 17,s of 18 <br /> a .r I <br /> 11 1 '4 1 Soil Gas',,Samples -`Because the primary reson,ifor use of} soil <br /> ' �' <br /> vapor"surveys' is the availability of on-site real`-time analytical capability, <br /> field splits are not used to checktheaccuracy o£ 'daily analytical data <br /> 11 1 4 2 Water Samples - Field splits water samples should be collected <br /> r <br /> `'for' approximately 1 out of every`10—water—sampl=es—collected—If--field <br /> duplicate 'samples are also being collected, the frequency, of field split <br /> samples should be reduced so, that either a field duplicate or field split is <br /> r I F <br /> collected for approxiMatIely one outrof every' 10 water samples collected ' <br /> I ' I ; <br /> 11 1 4 3 Soil Samples - Field splits are not recommended due to <br /> difficulties in obtaining true "split" samples in field <br /> i <br /> -11 1 % 4 T_Air Sample -= Field-split air-samples.should be-collected.—for i' <br /> I <br /> approximate ly"`1" out-'of every 10 air samples- collected If field -duplicate <br /> samples are also being collected, the frequency of field splLt samples should <br /> � s f . + i <br /> be reduced so that ei6er' a field duplicate or field 'split is collected for <br /> approximately one out of every 10 air samples <br /> 1.1 1 5 Blind Spikes <br /> ,r <br /> Blind, Spike samples are samples of known concentration which are <br /> submitted`as if normal ,field samples to ,evaluatefto accuracy of laboratory ' <br /> I <br /> results Spike ,samples are normally prepared by a certified laboratory at w <br /> typical concentrations of lOX + to 10OX the detect Lon' ,level Laboratories <br /> a <br /> ' r = <br /> preparing the spike shall submit written documentation to MARK regarding the <br /> method' of spike preparation and the theoretical constituent concentrations in •� <br /> 11-7 <br /> e ` <br />