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ALS Enuironme ntal CERTIFICATE OF ANALYSIS CLIENT: GeoEngineers, Inc. DATE: 4/14/2021 1101 Fawcett Ave. S., Suite 200 ALS SDG#: EV21040032 Tacoma, WA 98402 WDOE ACCREDITATION: C601 CLIENT CONTACT: Jacob Letts CLIENT PROJECT: Smith St. Mill LABORATORY CONTROL SAMPLE RESULTS ALS Test Batch ID: 164534-Water by NWTPH-GX Prepared 04/13/21 00:00 SPIKE LIMITS ANALYSIS ANALYSIS BY SPIKED COMPOUND METHOD %REC RPD QUAL ADDED RESULT MIN MAX RPD DATE Gasoline-BS NWTPH-GX 98.0 500 490 66.5 122.7 04/13/21 KLS Gasoline-BSD NWTPH-GX 99.0 1 500 495 66.5 122.7 12 04/13/21 KLS SPIKE LIMITS ANALYSIS ANALYSIS BY SURROGATE METHOD %REC RPD QUAL ADDED RESULT MIN MAX RPD DATE TFT-BS NWTPH-GX 104 10.0 10.4 60 140 04/13/21 KLS TFT-BSD NWTPH-GX 98.9 10.0 9.89 60 140 04/13/21 KLS ALS Test Batch ID: 164408-Water by NWTPH-DX Prepared 04/08/21 00:00 SPIKE LIMITS ANALYSIS ANALYSIS BY SPIKED COMPOUND METHOD %REC RPD QUAL ADDED RESULT MIN MAX RPD DATE Total Petroleum Hydrocarbon-Diesel- NWTPH-DX 84.0 1250 1050 67 125.2 04/08/21 JNF BS Total Petroleum Hydrocarbon-Diesel- NWTPH-DX 103 21 SR1 1250 1290 67 125.2 15.2 04/08/21 JNF BSD SPIKE LIMITS ANALYSIS ANALYSIS BY SURROGATE METHOD %REC RPD QUAL ADDED RESULT MIN MAX RPD DATE Pentacosane-BS NWTPH-DX 83.0 100 83.0 60 126 04/08/21 JNF Pentacosane-BSD NWTPH-DX 97.8 200 196 60 126 04/08/21 JNF SR1 - RPD outside of control limits. ALS Test Batch ID: 164422-Water by SW8260D Prepared 04/08/21 00:00 SPIKE LIMITS ANALYSIS ANALYSIS BY SPIKED COMPOUND METHOD %REC RPD QUAL ADDED RESULT MIN MAX RPD DATE Dichlorodifluoromethane(CFC-12)-BS SW8260D 78.6 10.0 7.86 50 150 04/08/21 DLC Dichlorodifluoromethane(CFC-12)-BSD SW8260D 79.1 1 10.0 7.91 50 150 25 04/08/21 DLC Chloromethane(Methyl Chloride)-BS SW8260D 93.7 10.0 9.37 50 150 04/08/21 DLC Chloromethane(Methyl Chloride)-BSD SW8260D 93.3 0 10.0 9.33 50 150 25 04/08/21 DLC Vinyl chloride-BS SW8260D 91.5 10.0 9.15 50 150 04/08/21 DLC Vinyl chloride-BSD SW8260D 90.6 1 10.0 9.06 50 150 25 04/08/21 DLC Bromomethane(Methyl Bromide)-BS SW8260D 87.3 10.0 8.73 50 150 04/08/21 DLC Bromomethane(Methyl Bromide)-BSD SW8260D 87.6 0 10.0 8.76 50 150 25 04/08/21 DLC Chloroethane-BS SW8260D 87.8 10.0 8.78 50 150 04/08/21 DLC Chloroethane-BSD SW8260D 84.9 3 10.0 8.49 50 150 25 04/08/21 DLC Carbon tetrachloride-BS SW8260D 99.5 10.0 9.95 50 150 04/08/21 DLC Carbon tetrachloride-BSD SW8260D 96.2 3 10.0 9.62 50 150 25 04/08/21 DLC Trichlorofluoromethane(CFC-11)-BS SW8260D 102 10.0 10.2 50 150 04/08/21 DLC Trichlorofluoromethane(CFC-11)-BSD SW8260D 100 2 10.0 10.0 50 150 25 04/08/21 DLC Carbon disulfide-BS SW8260D 93.6 10.0 9.36 50 150 04/08/21 DLC Carbon disulfide-BSD SW8260D 92.5 1 10.0 9.25 50 150 25 04/08/21 DLC Page 20 ADDRESS 8620 Holly Drive,Suite 100, Everett,WA 98208 1 PHONE 425-356-2600 I FAX 425-356-2626 ALS Group USA,Corp dba ALS Environmental www.aisgiobal.com RIGHT SU1-UTIOf15 � t I-F t t rlEF