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COLUMBIA ANALYTICAL SERVICES, INC. <br />QA/QC Report <br />Client: Shaw Environmental & Infrastructure, Inc Service Request: P0700704 <br />Project: Foothill Landfill, San Joaquin County (New Wells)/124591 Date Extracted: 08/06/2007 <br />Sample Matrix: Water Date Analyzed: 08/24/2007 <br />Lab Control Spike/Duplicate Lab Control Spike Summary <br />Chlorinated Herbicides <br />Extraction Method: METHOD Units: ug/L <br />Analysis Method: 8151A Basis: NA <br />Level: Low <br />Extraction Lot: KWG0708426 <br />Results flagged with an asterisk (') indicate values outside control criterlm <br />Percent recoveries and relative percent differences (RPD) are determined by the software using values in the calculation which have not been rounded <br />2 <br />Printed: 09/02/2007 13:16:07 Form 3C - Organic <br />uASteahh\Crystal.rptTonn3DLC.tpt SuperSet Reference: RR76177 <br />�j <br />00062 <br />Page I of 1 <br />Lab Control Sample <br />Duplicate Lab Control Sample <br />KWG0708426-1 <br />KWG0708426-2 <br />Lab Control Spike <br />Duplicate Lab Control Spike <br />e <br />/aRec <br />RPD <br />Analyte Name <br />Result Expected <br />%Rec <br />Result Expected <br />@/oRec <br />Limits <br />RPD <br />Limit <br />Dalapon <br />2.30 2.50 <br />92 <br />2.20 2.50 <br />88 <br />36-105 <br />5 <br />30 <br />Dicamba <br />2.17 2.50 <br />87 <br />2.03 2.50 <br />81 <br />50-102 <br />7 <br />30 <br />MCPP <br />212 250 <br />85 <br />182 250 <br />73 <br />26-118 <br />15 <br />30 <br />MCPA <br />193 250 <br />77 <br />183 250 <br />73 <br />28-123 <br />5 <br />30 <br />Dichlorprop <br />2.27 2.50 <br />91 <br />1.98 2.50 <br />79 <br />49-101 <br />13 <br />30 <br />2,4-D <br />2.18 2.50 <br />87 <br />2.04 2.50 <br />82 <br />47-93 <br />7 <br />30 <br />2,4,5 -TP (Silvex) <br />2.32 2.50 <br />93 <br />2.15 2.50 <br />86 <br />56-111 <br />8 <br />30 <br />2,4,5-T <br />2.44 2.50 <br />98 <br />2.25 2.50 <br />90 <br />58-114 <br />8 <br />30 <br />2,4 -DB <br />2.58 2.50 <br />103 <br />2.46 2.50 <br />98 <br />18-122 <br />5 <br />30 <br />D noseb <br />2.34 2.50 <br />94 <br />2.15 2.50 <br />86 <br />22-118 <br />9 <br />30 <br />Results flagged with an asterisk (') indicate values outside control criterlm <br />Percent recoveries and relative percent differences (RPD) are determined by the software using values in the calculation which have not been rounded <br />2 <br />Printed: 09/02/2007 13:16:07 Form 3C - Organic <br />uASteahh\Crystal.rptTonn3DLC.tpt SuperSet Reference: RR76177 <br />�j <br />00062 <br />Page I of 1 <br />