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LABORATORIES, INC. Herst Associates Project: NCYC Reported: 01/03/2008 10:44 4630 South Highway 94 North Outer Road Project Number: [none] Saint Charles, MO 63304 Project Manager: David Vasbinder Volatile Organic Analysis (EPA Method 8260) Quality Control Repo - Precision & Accuracy Control Limits Source Source Spike Percent Percent Constituent Batch ID QC Sample Type Sample ID Result Result Added Units RPD Recovery RPD Recove Lab Quaffs Benzene BQL1168 Matrix Spike 0714915-01 ND 20.730 25.000 ug/L 82.9 70-130 Matrix Spike Duplicate 0714915-01 ND 21.180 25.000 ug/L 2.1 84.7 20 70-130 - - _._. - --- - .... ....._..._...._.. .. .. ..--._.............-........ ........._......- 111, _.-_.......... _-- -- ... __ ._..._._ ...--............ ---.... ... Bromodichloromethane BQL1168 Matrix Spike 0714915-01 ND 30.870 25.000 ug/L 123 70-130 Matrix Spike Duplicate 0714915-01 ND 30.700 25.000 ug/L 0 123 20 70-130 -------..... __.-_ ........ __ .,_.. ----. _...... --- .......- ...._.... ......--_.......................-- _ ... --_-.- Chlorobenzene BOL1168 Matrix Spike 0714915-01 ND 25.800 25.000 ug/L 103 70-130 Matrix Spike Duplicate 0714915-01 ND 28.480 25.000 ug/L 10.1 114 20 70-130 __.... ---.-.. -- .--- _-.... ._-._ _.....................----.. .... _ -......... Chloroethane BQL1168 Matrix Spike 0714915-01 ND 21.380 25.000 ug/L 85.5 70-130 Matrix Spike Duplicate 0714915-01 ND 22.630 25.000 ug/L 5.7 90.5 20 70-130 ------ ... - - -. _ ...._.. .... ----._. _._.._............ ......-.._.......----- ..._... .._ -.._ _ �.... ...__..._ .._- ...__... 1,4-Dichlorobenzene BOL1168 Matrix Spike 0714915-01 ND 27.090 25.000 ug/L 108 70-130 Matrix Spike Duplicate 0714915-01 ND 29.570 25.000 ug/L 8.8 118 20 70-130 ..- ---..__... -- ---. .._-...._......- --..._......... -._--._.... .__.............. ......--...........__.-_. .._.............. ...._..-......... . .__. __-__.... ..._... _..... ........_.. .... .-__.......... -.....__......__.._._--__.._... 1,1-Dichloroethane BQL1168 Matrix Spike 0714915-01 ND 23.770 25.000 ug/L 95.1 70-130 Matrix Spike Duplicate 0714915-01 ND 23.690 25.000 ug/L 0.3 94.8 20 70-130 ...._......_... .. .._._. ....... .........--- .-.....-----._.._.............--............. ...._ ._ .----.. . ._ -. ..........-_ ---. ....------- --. .......... . ............_ .. ................ ....----.............._ 1,1-Dichloroethene BQL1168 Matrix Spike 0714915.01 ND 26.120 25.000 ug/L 104 70-130 Matrix Spike Duplicate 0714915-01 ND 25.360 25.000 ug/L 2.9 101 20 70-130 - _._...... ....... -._ _._._...... -_..._..............__. _ ._...........--...--- ....._........_ .. ...... - -._ . . Toluene BQL1168 Matrix Spike 0714915-01 ND 25.780 25.000 ug/L 103 70-130 Matrix Spike Duplicate 0714915-01 ND 25.940 25.000 ug/L 1.0 104 20 70-130 _.._..... _........ . ...-----.... ._...--.... _._.__........_._.. -.. .. _.._._... ....... __..........-__..... ......._ ......----............ Trichloroethene BQL1168 Matrix Spike 0714915-01 0.22000 24.500 25.000 ug/L 97.1 70-130 Matrix Spike Duplicate 0714915-01 0.22000 24.990 25.000 ug/L 2.0 99.1 20 70-130 -._--._.._........... .- .........-_. _.__ _.---.............-_...........�....... -- ....-- - .._..___...........---_.._. ........._.......... -.........-...... ......----............-- -- 1,2-Dichloroethane-d4(Surrogate) BQL1168 Matrix Spike 0714915-01 ND 11.160 10.000 ug/L 112 76-114 Matrix Spike Duplicate 0714915-01 ND 10.840 10.000 ug/L 108 76-114 _..._ ....... - - .... - ..__._ __..-... __._..._. ---._._... -... . .._ ....-..... ..---- _--. ..--------- ........_.._ __ . - .....--... _ .......___., Toluene-d8(Surrogate) BQL1168 Matrix Spike 0714915-01 ND 10.000 10.000 ug/L 100 88-110 Matrix Spike Duplicate 0714915-01 ND 10.210 10.000 ug/L 102 88-110 -- - _ ._........ .... .....- -- - _.. ........-................ ._ _........ ....._ _ _- . _.-_... ..._-._ 4-Bromofluorobenzene(Surrogate) BQL1168 Matrix Spike 0714915-01 ND 10.680 10.000 ug/L 107 86-115 Matrix Spike Duplicate 0714915-01 ND 11.430 10.000 ug/L 114 86-115 BC Laboratories The results in this report apply to the,samples analyzed in accordance,with the chain of custody document. This analytical report must be reproduced in its entirety. All results listed in this report are for the exclusive use of the submitting party.BC Lalxiratories,Inc.assumes no responsibility for report alteration,separation, detachment or third party interpretation. Page 30 of 35 4100 Atlas Court-Bakersfield,CA 93308-(661)327-4911 •FAX(661)327-1918-www.bclabs.com