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= -= ENVIRONMENTAL <br /> Analytical Chemists <br /> March 20, 1998 ORGANIC Quality Assurance Report for sample: 831067 <br /> Earth Tech, Inc. <br /> 100 West Broadway, Ste. 5000 <br /> Long Beach , CA 90802-4443 <br /> BATCH EPA CALIBRATION QA/QC METHOD QA/QC <br /> Constituent ID Method Units Type Conc. % REC AR NOTE Type Conc. % REC % REC AR % DIF MAV NOTE <br /> BFB <br /> OL 2A 602/8020 ug/L CCV 20.0 108 77-113 MS 20.0 101 98.5 61-130 2.5 7.2 ` <br /> 1L 2A 602/8020 mg/kg CCv 0.100 104 77-113 MS 0.100 102 101 60-129 1.5 11.3 <br /> Benzene OL 2A 160218020 ug/L CCV 20.0 107 77-119 MS 20.0 66-2 62.0 70-122 4.0 12.7 410 <br /> 1L 2A 602/8020 mg/kg CCV 0.100 1D9 77-119 MS 0.100 88.2 83.2 70-118 5.9 16.5 <br /> Ethyl Benzene OL 2A 602/8020 ug/L CCV 20.0 108 79-120 MS 20.0 89.0 86.3 77-119 3.0 6.0 <br /> 1L 2A 602/8020 mg/kg CCv 0.100 110 79-120 MS 0.100 108 99.8 77-116 8.1 13.5 <br /> Methyl tert-Butyl Ether OL 2A 602/8020 ug/L CCv 20.0 116 70 130 M5 20.0 331 320 61-140 3.4 20.0 410 <br /> 1L 2A 602/8020 mg/kg CCv 0.200 81.2 70-130 MS 0.100 638 628 61-140 1.4 20.0 410 <br /> Toluene OL 2A 602/8020 ug/L CCv 20.0 101 81-113 MS 20.0 92.9 89.7 73-121 3.0 14.2 <br /> 1L 2A 602/8020 mg/kg CCv 0.100 102 81-113 MS 0.100 104 96.4 63-129 7.2 20.8 <br /> Xylene OL 2A 602/8020 ug/L CCv 60.0 104 78-118 MS 60.0 107 106 77-120 0.9 72.7 <br /> 1L 2A 602/8020 mg/kg CCv 0.300 107 78-118 MS 0.300 108 99.3 72-123 8.1 16.7 <br /> TPH-Gas 1Q12A 8D15114 mg/kg CCV 100 88.3 75-125 MS 50.0 84.2 89.0 75-125 5.5 20.0 <br /> 7012A 1 8015" mg/L CCv 20.0 86.4 75-125 MS 10.0 89.8 88.6 75-125 1.3 20.0 <br /> FGL IU = 19980309 N/A => Not Applicable NOTE _> See note indicated below. [ <br /> Notes and comments continued next page . . . . . `� <br /> Corpora 1e OfficesT�L r � � Office&Laboratory FigId Office <br /> P.O.Box 272 1853 Corporation Street 2500 Stagecoach Road Visalia,Cahlornia <br /> Santa Paula,CA 93061-0272 Stockton,CA 95215 TEL(209)734-9473 <br /> TEL: (805)659-0910 TEL: (209)942-0181 Mobile:(209)737-2399 <br /> FAX: (805)525-4172 FAX: (209)942-0423 FAX:(209)734-8435 <br /> rA Fi Apr niifrar n N-1571 CA ELAP Certification No:1563 <br />