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QUALITY CONTROL SUMMARYWG1998174 <br />Volatile Organic Compounds (GC/MS) by Method 8260B L1580356-02,03,04,05,06,07,08,09,10 <br />Laboratory Control Sample (LCS) <br />(LCS) R3887797-1 02/02/23 16:15 <br /> Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier <br />Analyte mg/kg mg/kg %% <br />Acetone 0.125 0.117 93.6 10.0-160 <br />Acrylonitrile 0.125 0.103 82.4 45.0-153 <br />Benzene 0.0250 0.0246 98.4 70.0-123 <br />Bromobenzene 0.0250 0.0236 94.4 73.0-121 <br />Bromodichloromethane 0.0250 0.0240 96.0 73.0-121 <br />Bromoform 0.0250 0.0237 94.8 64.0-132 <br />Bromomethane 0.0250 0.0247 98.8 56.0-147 <br />n-Butylbenzene 0.0250 0.0267 107 68.0-135 <br />sec-Butylbenzene 0.0250 0.0268 107 74.0-130 <br />tert-Butylbenzene 0.0250 0.0266 106 75.0-127 <br />Carbon tetrachloride 0.0250 0.0240 96.0 66.0-128 <br />Carbon disulfide 0.0250 0.0239 95.6 56.0-133 <br />Chlorobenzene 0.0250 0.0247 98.8 76.0-128 <br />Chlorodibromomethane 0.0250 0.0233 93.2 74.0-127 <br />Chloroethane 0.0250 0.0244 97.6 61.0-134 <br />Chloroform 0.0250 0.0239 95.6 72.0-123 <br />Chloromethane 0.0250 0.0184 73.6 51.0-138 <br />2-Chlorotoluene 0.0250 0.0254 102 75.0-124 <br />4-Chlorotoluene 0.0250 0.0253 101 75.0-124 <br />1,2-Dibromo-3-Chloropropane 0.0250 0.0223 89.2 59.0-130 <br />1,2-Dibromoethane 0.0250 0.0242 96.8 74.0-128 <br />Dibromomethane 0.0250 0.0238 95.2 75.0-122 <br />1,2-Dichlorobenzene 0.0250 0.0240 96.0 76.0-124 <br />1,3-Dichlorobenzene 0.0250 0.0242 96.8 76.0-125 <br />1,4-Dichlorobenzene 0.0250 0.0240 96.0 77.0-121 <br />Dichlorodifluoromethane 0.0250 0.0217 86.8 43.0-156 <br />1,1-Dichloroethane 0.0250 0.0236 94.4 70.0-127 <br />1,2-Dichloroethane 0.0250 0.0224 89.6 65.0-131 <br />1,1-Dichloroethene 0.0250 0.0253 101 65.0-131 <br />cis-1,2-Dichloroethene 0.0250 0.0252 101 73.0-125 <br />trans-1,2-Dichloroethene 0.0250 0.0258 103 71.0-125 <br />1,2-Dichloropropane 0.0250 0.0225 90.0 74.0-125 <br />1,1-Dichloropropene 0.0250 0.0255 102 73.0-125 <br />1,3-Dichloropropane 0.0250 0.0240 96.0 80.0-125 <br />cis-1,3-Dichloropropene 0.0250 0.0249 99.6 76.0-127 <br />trans-1,3-Dichloropropene 0.0250 0.0241 96.4 73.0-127 <br />2,2-Dichloropropane 0.0250 0.0252 101 59.0-135 <br />Ethylbenzene 0.0250 0.0262 105 74.0-126 <br />Hexachloro-1,3-butadiene 0.0250 0.0242 96.8 57.0-150 <br />Isopropylbenzene 0.0250 0.0270 108 72.0-127 <br />1 Cp <br />2 Tc <br />3 Ss <br />4 Cn <br />5 Sr <br />6 Qc <br />7 Gl <br />8 Al <br />9 Sc <br />ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: <br />711 Stantec - San Diego, CA 185851132 L1580356 02/10/23 07:56 40 of 44 <br />ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: <br />711 Stantec - San Diego, CA 185851132 L1580356 02/10/23 10:37 40 of 44