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6.0 QUALITY ASSURANCE <br />The quality assurance program is designed to check the precision and accuracy of the analytical <br />' results received from the laboratory providing the water quality analyses. During the collection <br />of samples for analysis a duplicate sample from either a ground water or surface water <br />monitoring site will be collected and analyzed. The duplicate sample analysis is compared with <br />its paired sample for similarity. <br />Two duplicate samples were collected during 2009 for laboratory quality assurance purposes. <br />The duplicate samples were taken at surface water monitoring sites TR-A in April and TR-B in <br />August. Results of the duplicate analyses were favorable for most of the parameters tested. <br />The April duplicate for TR-A verified 10 of the 15 laboratory parameters to be within 5% of the <br />original values obtained. The duplicate sample value for aluminum was 133% of the original <br />value (0.03 mg/L-original vs. 0.04 mg/L-duplicate). The duplicate sample value for iron was <br />92% of the original value (0.25 mg/L-original vs. 0.23 mg/L-duplicate). The duplicate sample <br />value for sodium was 139% of the original value (4.4 mg/L-original vs. 6.1 mg/L-duplicate). <br />The duplicate sample value for chloride was 200% of the original value (1 mg/L-original vs. 2 <br />' mg/L-duplicate). The duplicate sample value for TSS was 120% of the original value (5 mg/L- <br />original vs. 6 mg/L-duplicate). <br />The August duplicate for TR-B verified 13 of the 15 parameters to be within 5% of the original <br />value obtained. The duplicate value for iron was 430/',b of the original value (0.21 mg/1-original <br />vs. 0.09 mg/1-duplicate). The duplicate value for total suspended solids was 120% of the original <br />value (5 mg/1-original vs. 6 mg/1-duplicate). <br />^^?wWCENGINEERING Page 17