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Alpha Analytical Laboratories, Inc. email: clientservices@alpha-labs.com <br />Corporate: 208 Mason Street I Ukiah, CA 95482 I T: 707-468-0401 F: 707-468-5267 I ELAPst 1551 <br />Shimmick Construction Project Manager: Hagr Balla <br />8201 Edgewater Dr., Suite 202 Project: Smith Canal Reported: <br />Oakland, CA 94621 Project Number: CCR 66261.24 Tables I and II 10/15/20 15:17 <br />TCLP Volatile Organic Compounds by EPA Method 8260B - Quality Control <br />Analyte(s) Result <br />Reporting <br />Limit Units <br />Spike Source <br />Level Result %REC <br />%REC RPD <br />Limits RPD Limit Flag <br />Batch AJ03147 - ZHE GCMS <br />Blank (AJ03147-BLKI) Prepared: 10/01/20 Analyzed: 10/02/20 <br />Benzene ND 0.50 mg/L <br />Carbon tetrachloride ND 0.50 mg/L <br />Chlorobenzene ND 100 mg/L <br />Chloroform ND 6.0 mg/L <br />1,4-Dichlorobenzene ND 7.5 mg/L <br />1,2-Dichloroethane ND 0.50 mg/L <br />1,1-Dichloroethene ND 0.70 mg/L <br />Methyl ethyl ketone ND 200 m8/1- <br />Tetrachloroethene ND 0.70 mg/L <br />Trichloroethene ND 0.50 mg/L <br />Vinyl chloride ND 0.20 mg/L <br />Surrogate: Bromolluorobenzene 0.0285 mg/L 0.0250 114 70-130 <br />Surrogate: Dibromeuoromethane 0.0236 mg/L 0.0250 94.4 70-130 <br />Surrogate: Toluene-d8 0.0264 mg/L 0.0250 106 70-130 <br />LCS (AJ03147-BSI) Prepared: 10/01/20 Analyzed: 10/02/20 <br />Benzene 0.0197 0.50 mg/L 0.0200 98.3 82-122 <br />Carbon tetrachloride 0.0210 0.50 mg/L 0.0200 105 77-134 <br />Chlorobenzene 0.0211 100 mg/L 0.0200 105 84-119 <br />Chloroform 0.0209 6.0 mg/L 0.0200 105 81-122 <br />1,4-Dichlorobenzene 0.0205 7.5 mg/L 0.0200 102 84-120 <br />1,2-Dichloroethane 0.0190 0.50 mg/L 0.0200 95.0 77-117 <br />1,1-Dichloroethene 0.0204 0.70 mg/L 0.0200 102 71-151 <br />Methyl ethyl ketone 0.0422 200 mg/L 0.0400 106 70-130 <br />Tetrachloroethene 0.0212 0.70 mg/L 0.0200 106 65-133 <br />Trichloroethene 0.0205 0.50 mg/L 0.0200 103 84-123 <br />Vinyl chloride 0.0243 0.20 mg/L 0.0200 122 70-130 <br />Surrogate: Bromeuorobenzene 0.0286 mg/L 0.0250 114 70-130 <br />Surrogate: Dibromotluoromethane 0.0240 mg/L 0.0250 95.8 70-130 <br />Surrogate: 7'oluene-d8 0.0260 mg/L 0.0250 104 70-130 <br />The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. <br />Page 16 of 23