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STL <br /> Hexavalent Chromium Submission# 2002-12-0042 <br /> Aqua Science Engineers, Inc <br /> Attn Erik Paddleford <br /> 208 West EI Pintado <br /> Danville, CA 94526 <br /> Phone (925) 820-9391 Fax (925) 837-4853 <br /> Project 3254 Received 12103120021315 <br /> SINGH S UNOCAL <br /> Batch QC Report <br /> Prep(s) 7196A water Test(s) 7196A <br /> Method Blank Water QC Batch#2002112103-01 31 <br /> MB 2002112103-01 31-001 Date Extracted 12/03/2002 17 20 <br /> Compound Conc RL Unit Analvzed Flag <br /> Chromium (Hexavalent) ND 1001 mg/L 12/03/2002 17 20 <br /> Severn Trent Laboratories, Inc 12/11/2002 08 57 <br /> STL San Francisco"1220 Quarry Lane Pleasanton CA 94566 <br /> A partuf8evwi TremPk Tel 925 484 1919 Fax 925 484 1096'www stl-inc corn'CA DHS ELAP#2496 Page 3 of 5 <br />