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Sequoia 680 Chesapeake D,,,, Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (925)988-%00 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX 916) 921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 707 792 1865 TAX(707)792-0342 <br /> ATC Associates,Inc Project Ripon USD Sampled 2/5/99 <br /> 1 l 17 Lone Palm Ave, Suite B Project Number 13099 0001 Received 2/10/99 <br /> Modesto,CA 95351 Project Manager Drew Van Allen Re orted 2/25199 <br /> Volatile Organic Compounds by EPA Method 8260B/Quality Control <br /> Sequoia Analytical-Petaluma <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Nates* <br /> LCS 9020394-BS1 <br /> Methyl tert-butyl ether 2/17199 5 00 501 ug/l 700-130 100 <br /> Surrogate Dibromofluoromethane 500 532 860-118 106 <br /> 'Surrogate 1 2-Drchloroethane-d4 500 525 800-120 105 <br /> Surrogate Toluene-d8 500 5 05 880-110 101 <br /> Surrogate 4-Bromofluorobenzene 500 521 860-115 104 <br /> LCS 9020394-BS2 <br /> Methyl tert-butyl ether 2/18/99 Soo 515 ug/I 700-130 103 <br /> Surrogate Dibromofluoromethane 500 549 860-118 110 <br /> Surrogate 12-Drchloroethane-d4 500 530 800-120 106 <br /> ,Surrogate Toluene-d8 500 519 880-110 104 <br /> Surrogate 4-Bromofluorobenzene 500 552 860-115 110 <br /> 9020394-BS3 <br /> Pyl tent-butyl ether 2/19199 5 00 463 ug/l 700-130 926 <br /> Surrogate Dibromofluoromethane 500 510 860-118 102 <br /> 12-Drchloroethane-d4 500 504 800-120 101 <br /> ,Surrogate <br /> Surrogate Toluene-d8 500 487 880-110 974 <br /> Surrogate 4-Bromofluorobenzene 500 510 860-115 102 <br /> 'Matrix Spike 9020394-MSI P902237-02 <br /> Methyl tert-butyl ether 2/17/99 5 00 ND 629 ug/I 700-130 126 <br /> Surrogate Dibromofluoromethane 500 538 860-118 108 <br /> Surrogate 1 2-Drchloroethane-d4 100 5 88 800-120 118 <br /> ISurrogate Toluene-d8 Soo 506 lo880-110 101 <br /> Surrogate 4-Bromofluorobenzene 500 503 860-115 101 <br /> Matrix Spike Dup 9020394-MSD1 P902237-02 <br /> 'Methyl tert-butyl ether 2117199 5 00 ND 634 ug/l 700-130 127 15 0 0 791 <br /> Surrogate Dibromofluoromethane 500 533 860-118 107 <br /> Surrogate 1 2-Drchloroethane-d4 500 580 800-120 116 <br /> 'Surrogate Toluene-d8 500 5 04 „ 880-110 101 <br /> Surrogate 4-Bromofluorobenzene 5 00 5 15 860-115 103 <br /> Sequoia Analytical-Petaluma *Refer to end of report for text of notes and definitions <br /> ' page 8 of 9 <br /> 7 <br />