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paces REPORT OF LABORATOCORPORATED LABORATORY ANALYSIS <br /> 111E ASSOaANCE OF lln AtiTY <br /> Mr. Brian Thomas QUALITY CONTROL DATA May 24, 1993 <br /> Page 10 PACE Project Number: 430513521 <br /> tClient Reference- Exxon 7--3942 (EE) <br />' Corrosivity (pH) <br /> Batch: 70 21175 <br /> Samples- 70 0070287 <br /> SAMPLE DUPLICATE: <br /> Duplicate <br /> Parameter Units MDL 700071518 70 70 0071518 RPD <br /> Corrosivity (pH) Units 0.5 8.0 8.0 OX <br />' LABORATORY CONTROL SAMPLE AND CONTROL SAMPLE DUPLICATE <br /> Reference Dupl <br /> Parameter Units MDL Value Recov Recv RPO <br /> Corrosivity (pH) Units 0.5 7 0 100/ 100 <br /> 1 <br /> r <br /> 11 Digital Drive offices Serving Minneapolis Minnesota Charlotte North Carolina An Equal Qpportunify Employer <br /> Novato CA 94949 Tampa Florida Asheville North Carolina <br /> TEL 415 883 6180 Iowa City Iowa New York New York <br /> FAX 415 883 2673 San Francisco California Pittsburgh Pennsylvania <br /> Kansas City Mtssoun Denver Colorado <br /> Los Angeles California <br />