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SMITH-EMERY COMPANY <br /> The Full Service Independent Testrng Laboratory, Established I904 <br /> 781 East Washington Boulevard a Los Angeles.Caafornla 9o021 a (213)749-3411 a Fax.(213)746-7228 <br /> P 0 Bnx 880550 Hunter's Point Shipyard Bldg I14 a San Franc, C4hf0rnu 94188 a (415)330.3000 0 Fax(415)822-5864 <br /> 5427 East La Palma Avenue a Anaheurt,c allfomu 92807 • (n4)693..1026 • Fuc.(714)693-IM4 <br /> August 11, 1993 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> Client Aqua Geosciences <br /> File No 72461 <br /> Report No 32150806 <br /> Matrix Sozl <br /> Method EPA 8020 <br /> Lab No 3215080615 <br /> Batch No 32168020-1 <br /> SPIKE <br /> SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (ug:/kg) (uz kg) (ug/kg) % Mg RANGE(X) R-E.D. <br /> Benzene (S) ND 198 168 85 <br /> 0Benzene (DS) ND 166 135 82 64-125 4% <br /> Toluene (S) ND 198 178 90 <br /> Toluene (DS) ND 166 129 78 70-118 14% <br /> Ethyl Benzene (S) ND 198 176 89 <br /> Ethyl Benzene (DS) ND 166 126 76 70-121 15% <br /> Xylene (S) ND 594 590 99 <br /> Xylene (DS) ND 498 432 87 67-126 13% <br /> S — Spike <br /> DS — Duplicate Spike <br /> R P D — Relative Percent Difference <br /> mr — None Detected <br /> ALL REPORTS ARE SUBMITTED AB TME cONitDENTIAL PROPERTY OF CLIENTS.AUTHORIZATION FOR PUBLICATION OF OUR REPORT CONCLUSIONS OR EX- <br /> TRACTS FROM OR REGARDING THEM 1a RESERVED PENDIND OUR WRITTEN APPROVAL A6 A MUTUAL PROTECTION TO CLIENTS THC PUBLIC AND 40UR8ELV[9. <br />