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�- Laboratories Inc. ( ; Environmental Testing Laboratory Since 1949 Ground Zero Analysis , Inc. Reported : 01 /27/2020 7 :46 1172 Kansas Avenue Project: Bentz - Associated Tractor Modesto , CA 95351 Project Number: 1174 Project Manager: Project Manager Volatile Organic Analysis ( EPA Method 826013 ) Quality Control Report - Precision & Accuracy Control Limits Source Source Spike Percent Percent Lab Constituent Type Sample ID Result Result Added Units RPD Recovery RPD Recovery Quals QC Batch ID : B068809 Used client sample : N Benzene MS 1941859-79 ND 0. 11509 0. 12500 mg/kg 92. 1 70 - 130 MSD 1941859-79 ND 0 . 11676 0. 12500 mg/kg 1 .4 93 .4 20 70 - 130 Bromodichloromethane MS 1941859-79 ND 0. 12451 0. 12500 mg/kg 99 .6 70 - 130 MSD 1941859-79 ND 0. 12580 0 . 12500 mg/kg 1 . 0 101 20 70 - 130 Chlorobenzene MS 1941859-79 ND 0. 12307 0. 12500 mg/kg 98 . 5 70 - 130 MSD 1941859-79 ND 0. 13368 0. 12500 mg/kg 8. 3 107 20 70 - 130 Chloroethane MS 1941859-79 ND 0 . 10686 0 . 12500 mg/kg 85. 5 70 - 130 MSD 1941859-79 ND 0. 10972 0 . 12500 mg/kg 2 .6 87 . 8 20 70 - 130 1 ,4-Dichlorobenzene MS 1941859-79 ND 0 . 12924 0. 12500 mg/kg 103 70 - 130 MSD 1941859-79 ND 0. 14138 0 . 12500 mg/kg 9.0 113 20 70 - 130 1 , 1 -Dichloroethane MS 1941859-79 ND 0. 10834 0 . 12500 mg/kg 86 .7 70 - 130 MSD 1941859-79 ND 0. 11161 0 . 12500 mg/kg 3 . 0 89 . 3 20 70 - 130 1 , 1 -Dichloroethene MS 1941859-79 ND 0. 10274 0. 12500 mg/kg 82 . 2 70 - 130 MSD 1941859-79 ND 0. 10309 0. 12500 mg/kg 0. 3 82. 5 20 70 - 130 Toluene MS 1941859-79 ND 0 . 11988 0. 12500 mg/kg 95. 9 70 - 130 MSD 1941859-79 ND 0 . 12602 0. 12500 mg/kg 5. 0 101 20 70 - 130 Trichloroethene MS 1941859-79 ND 0. 11513 0 . 12500 mg/kg 92 . 1 70 - 130 MSD 1941859-79 ND 0. 11835 0. 12500 mg/kg 2. 8 94 . 7 20 70 - 130 1 ,2-Dichloroethane-d4 (Surrogate) MS 1941859-79 ND 0. 050580 0. 050000 mg/kg 101 70 - 121 MSD 1941859-79 ND 0 . 049500 0. 050000 mg/kg 2. 2 99. 0 70 - 121 Toluene-d8 (Surrogate) MS 1941859-79 ND 0.050410 0 . 050000 mg/kg 101 81 - 117 MSD 1941859-79 ND 0.049460 0 . 050000 mg/kg 1 . 9 98 . 9 81 - 117 4-Bromofluorobenzene (Surrogate) MS 1941859-79 ND 0 .049360 0.050000 mg/kg 98 . 7 74 - 121 MSD 1941859-79 ND 0 . 051940 0.050000 mg/kg 5. 1 104 74 - 121 QC Batch ID : B068853 Used client sample : N Benzene MS 1941859-88 ND 24 . 210 25 .000 ug/L 96. 8 70 - 130 MSD 1941859-88 ND 24. 140 25 .000 ug/L 0. 3 96 . 6 20 70 - 130 Bromodichloromethane MS 1941859-88 ND 27. 350 25.000 ug/L 109 70 - 130 MSD 1941859-88 ND 26. 090 25.000 ug/L 4.7 104 20 70 - 130 Chlorobenzene MS 1941859-88 ND 27 . 370 25 .000 ug/L 109 70 - 130 MSD 1941859-88 ND 25 . 590 25 .000 ug/L 6 .7 102 20 70 - 130 Chloroethane MS 1941859-88 ND 25 . 140 25 .000 ug/L 101 70 - 130 MSD 1941859-88 ND 25.590 25.000 ug/L 1 . 8 102 20 70 - 130 1 ,4-Dichlorobenzene MS 1941859-88 ND 28. 150 25.000 ug/L 113 70 - 130 MSD 1941859-88 ND 27 . 930 25.000 ug/L 0.8 112 20 70 - 130 1 , 1 -Dichloroethane MS 1941859-88 ND 22. 800 25 .000 ug/L 91 . 2 70 - 130 MSD 1941859-88 ND 22. 980 25 .000 ug/L 0. 8 91 . 9 20 70 - 130 The results in this report apply to the .samples analyzed in accordance with the chain of custody document . Thu analytical report oars( be reproduced in its entirety. All results listed in this report are for the exclusive use of the submitting party. BC Laboratories, Inc. assumes no responsibility for report alteration, separation, detachment or third party interpretation. '.. Report ID: 1000990981 4100 Atlas Court Bakersfield , CA 93308 (661 ) 327-4911 FAX (661 ) 327-1918 www, bc[abs.com Page 30 of 35