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McCampbell Analytical, Inc. <br />4 <br />1534 Willow Pass Road, Pittsburg, CA 94565-1701 <br />Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 <br />http://www.mccampbell.com / E-mail: main@mccampbell.com <br />I <br />"When Quality Counts" <br />Chow Engineering <br />Client Project ID: #i 1R-120; CalWater <br />Date Sampled: 12/13/11 <br />Stockton <br />7770 Pardee Lane, Ste. 100 <br />Date Received: 12/13/11 <br />Client Contact: Reuben Chow <br />Date Reported: 12/16/11 <br />Oakland, CA 94621-3023 <br />Client P.O.: <br />Date Completed: 12/16/11 <br />Work Order: 1112399 <br />December 16, 2011 <br />Chromium (111) Concentration: <br />Pile 1 (Lab I13#1112399-001): 34 mg/Kg <br />Pile 2 (Lab 113#1112399-002): 36 mg/Kg <br />Pile 3 (Lab ID#1112399-002): 49 mg/Kg <br />Pile 4 (Lab I13#1112399-004): 44 mg/Kg <br />Pile 5 (Lab I13#1112399-005): 43 mg/Kg <br />Please note that Chromium (III) concentration is obtained by subtracting [Hexachrome] from [Total Chromium]. <br />DHS ELAP Certification 1644 <br />Angela Rydelius, Lab Manager <br />Page 4 of 6 <br />