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f' � uperior Precision ,qr��/�/cam/, /nc. <br /> I 82SArnold Drive, Suite 1 1 • <br /> Nlartinez- California 9115 53 (51 O) 229-15 12 / fax 1'510) 229-? S26 <br /> i L C E R T I F I C A T E O F A N A L Y S I S <br /> LLABORATORY NO. : 84729 DATE RECEIVED: 12/31 /91 f <br /> CLIENT: Harding Lawson Associates , Concord DATE REPORTED: 01/06/92 � <br /> CLIENT JOB NO. : 17060 , 025 . 03 DATE SAMPLED : 12/30/91 <br /> 4 <br /> L <br /> ANALYSIS FOR BENZENE, TOLUENE, ETHYL BENZENE & XYLENES <br /> Lby EPA SW-846 Methods 5030 and 8020 <br /> Concentration( ug/L) <br /> LAB ' Ethyl <br /> L#-- Sample-Identification Benzene Toluene Benzene Xylenes f <br /> _---------- ------- ------- ------- ------- <br /> 1 t.,MW-1 w v u, }....n. 820 Y .28 u . �.90 4 -1-2012 MW-2 ND<0 . 3 ND<0. 3 ND<0. 3 ...ND<0. 3 <br /> 3 MW-3 ND<0 . 3 ND<0 . 3 ND<0. 3 ND<0 . 3 <br />-L 4 MW-4 ND<0 . 3 ND<0. 3 ND<0. 3 NO<0 . 3 } <br /> 5 MW-5 ND<0 . 3 ND<0. 3 ND<0 . 3 ND<0. 3 <br /> 6 MW-6 ND<0. 3. - ND<0 . 3 ND<0. 3 ND<0 . 3 <br /> �,. MW-8 y 800 90 140 230 `­� <br /> 4MW-9 - 7000 520 2500 3600 , <br /> £'MW7-.10.. v . . . 7500..-.. __- 300 1600 - 5500 <br /> 10 MW-11 ND<0. 3 ND<0. 3 ND<0. 3 ND<0 .3 <br /> L1 MW-12 ND<0. 3 ND<0 . 3 ND<0. 3 ND<0 . 3 <br /> 2 MW-13 ND<0 . 3 ND<0 .3 ND<0. 3 ND<O . 3 <br /> 13 MW-14 ND<0 .3 ND<0. 3 ND<0. 3 ND<0 . 3 <br /> L4 MW-15 ND<0 . 3 ND<0.3 ND<0.3 ND<0 . 3 <br /> 5 COMPOSITE (ug/kg) ND<3 . - ND<3 N0<3 ND<3 <br /> 16 trip blank ND<0 .3 ND<0 .3 ND<0. 3 ND<0. 3 <br /> 17 MW-10A - _ 14000 , 50'0" 2700 9700_ } <br /> �g/L. - parts per billion (ppb) � . <br /> ug/kg - parts per billion (ppb) <br /> Method Detection Limit in Soil : 3 ug/kg <br /> Method Detection Limit in Water: 0 . 3 ug/L <br /> t- a <br /> Possible interferences with surrogate compound or a dilution caused <br /> low result for this analysis . <br /> QAQC Summary: <br /> Daily Standard run at 20ug/L: RPD = < 15% ' <br /> MS/MSD Average Recovery = 87%: , Duplicate RPD = < 7 <br /> Richard Srna, Ph.D. <br /> LA <br /> Laboratory Director <br /> Certified Laboratories j <br />