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1 <br /> Sequoia 1455 McDowell Blvd,MOM Sir,D <br /> Pouilumrt CA 94954 <br /> ' (707)792 1865 <br /> mW Analytical FAX(707)792-0 <br /> www sequoialabs ca <br /> 1 <br /> Seeor-Rancho Cordova Project Arco Site 4932,Stockton,CA P503205 <br /> 3017 Krlgmc Road Suite 100 Project Number WR 63964 Reported ' <br /> Rancho Cordova CA,95670 Project Manager-Rusty Benkosky 03/30/0512 44 <br /> Volatile Organic CompoundS by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma ' <br /> Reporting Spike Source %REC RPD <br /> Malyne Result L.tmu Units Level Result '/*REC Limits RPD Limit Nolea <br /> Batch 5030223-EPA 5030B waters/EPA 9260E ' <br /> Matrix Spike Du 5030223-14LSDi) Source P503177-03 Prepared&Analyzed 03122/05 <br /> Benzene 504 030 ugA 500 ND 101 81-118 4 20 ' <br /> Ethylbenzene 537 050 Sao 013 105 89-122 4 20 <br /> Methyl tent butyl ether S34 050 Soo 031 101 77-123 8 20 <br /> Toluene 538 050 " Soo ND 108 84-119 5 20 <br /> Xylenes(total) 163 0 SO " ISO 031 107 86-132 6 20 ' <br /> Surrogate Dibrantofluoromethane 482 " 500 96 84-122 <br /> Surrogate 12-Dfchloroethane-d4 495 500 99 74-135 <br /> Surrogate Toluene-d8 483 Soo 97 84-119 ' <br /> Batch 5030233-EPA 5030B waters/EPA 8260B <br /> Blank(5030233-BLKI) Prepared&Analyzed 03/13/05 <br /> Benzene ND 050 0811 <br /> Ethylbenzcne ND 050 <br /> Methyl tcrt butyl ether ND 050 <br /> Toluene ND 050 , <br /> Xylenes(local) ND 050 <br /> Surrogate.Dibromofluoromatliane 556 500 111 84-127 <br /> Susrogafa 1,7-D1chloroethane-d4 546 Soo 109 74435 <br /> Surrogate Toluenr-d8 534 Soo 107 84-119 ' <br /> Labo�Control Sample(5030233-BSI) Prepared&Analyzed 03/23/05 <br /> Benzene 474 050 usa S Oil 95 8i-1 IS <br /> lstttytbenuno 491 050 Soo 98 89-122 , <br /> Methyl tert butyl ether 504 050 " Soo 101 77-123 <br /> Toluene 493 050 Soo 99 84-119 <br /> Xyl--(Iota}) 146 0S0 15O 97 86-132 <br /> Surrogate Dibromofluaromethane 567 Soo 113 84-121 ' <br /> Swmgare 1,1-D1ch1oroethane-d4 526 " 500 10S 74-135 <br /> Surrogate Toluene-d8 527 " 500 105 84-119 <br /> Sequoia Analytical-Petaluma The residtt In lhfs report apply to the samplas analysed fn accordance wrth the chain of <br /> custody documeru We-otherwise stared resulu ata reporred on a wee weight basis ' <br /> lY,fs analylfcal rtport mart be reproduced in lu ealfnty <br /> Page I7 of 20 <br /> 1 <br />