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-� Laboratories Inc. <br /> Environmental Testing Laboratory Since 1949 <br /> Ground Zero Analysis , Inc. Reported : 08/21 /2019 17 : 38 <br /> 1172 Kansas Avenue Project: Soil Samples <br /> Modesto , CA 95351 Project Number: 1174 - Associated Tractor <br /> Project Manager: Project Manager <br /> Volatile Organic Analysis ( EPA Method 826013 ) <br /> Quality Control Report - Precision & Accuracy <br /> Control Limits <br /> Source Source Spike Percent Percent Lab <br /> Constituent Type Sample ID Result Result Added Units RPD Recovery RPD Recovery Quals <br /> QC Batch ID : B053965 Used client sample : N <br /> Benzene MS 1927434- 11 ND 0.042870 0 . 050000 mg/kg 85.7 70 - 130 <br /> MSD 1927434-11 ND 0 . 042270 0.050000 mg/kg 1 .4 84 . 5 20 70 - 130 <br /> Bromodichloromethane MS 1927434-11 ND 0. 054910 0. 050000 mg/kg 110 70 - 130 <br /> MSD 1927434-11 ND 0.052690 0.050000 mg/kg 4. 1 105 20 70 - 130 <br /> Chlorobenzene MS 1927434- 11 ND 0.048750 0. 050000 mg/kg 97 . 5 70 - 130 <br /> MSD 1927434- 11 ND 0. 046850 0 . 050000 mg/kg 4 . 0 93.7 20 70 - 130 <br /> Chloroethane MS 1927434-11 ND 0 . 045900 0 . 050000 mg/kg 91 . 8 70 - 130 <br /> MSD 1927434-11 ND 0. 049780 0.050000 mg/kg 8. 1 99 .6 20 70 - 130 <br /> 1 ,4-Dichlorobenzene MS 1927434-11 ND 0. 047620 0.050000 mg/kg 95. 2 70 - 130 <br /> MSD 1927434- 11 ND 0.043430 0.050000 mg/kg 9 . 2 86.9 20 70 - 130 <br /> 1 , 1 -Dichloroethane MS 1927434- 11 ND 0.048370 0 . 050000 mg/kg 96. 7 70 - 130 <br /> MSD 1927434-11 ND 0.048240 0 . 050000 mg/kg 0. 3 96 . 5 20 70 - 130 <br /> 1 , 1 -Dichloroethene MS 1927434-11 ND 0 . 057250 0. 050000 mg/kg 114 70 - 130 <br /> MSD 1927434-11 ND 0. 047220 0. 050000 mg/kg 19.2 94 .4 20 70 - 130 <br /> Toluene MS 1927434- 11 ND 0. 050050 0. 050000 mg/kg 100 70 - 130 <br /> MSD 1927434- 11 ND 0.046560 0.050000 mglkg 7 . 2 93. 1 20 70 - 130 <br /> Trichloroethene MS 1927434- 11 ND 0.050110 0 . 050000 mg/kg 100 70 - 130 <br /> MSD 1927434-11 ND 0.046770 0 . 050000 mg/kg 6. 9 93. 5 20 70 - 130 <br /> 1 ,2-Dichloroethane-d4 (Surrogate) MS 1927434-11 ND 0. 053030 0. 050000 mg/kg 106 70 - 121 <br /> MSD 1927434-11 ND 0. 056770 0. 050000 mg/kg 6. 8 114 70 - 121 <br /> Toluene-d8 (Surrogate) MS 1927434-11 ND 0.051790 0.050000 mglkg 104 81 - 117 <br /> MSD 1927434- 11 ND 0.051530 0.050000 mglkg 0. 5 103 . 81 - 117 <br /> 4-Bromofluorobenzene (Surrogate) MS 1927434-11 ND 0.052690 0 . 050000 mg/kg 105 74 - 121 <br /> MSD 1927434-11 ND 0.052920 0 . 050000 mg/kg 0.4 106 74 - 121 <br /> The results in this report apply to the samples analyzed in accordance with the chain ol'custody document . This analytical report must be reproduced in its entirety. <br /> 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. <br /> Report ID : 1000928515 4100 Atlas Court Bakersfield, CA 93308 (661 ) 327-4911 FAX (661 ) 327-1918 www. bclabs.com Page 19 of 23 <br />