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Project: <br />Project Number: <br />Project Manager: <br />ENGEO-Lathrop <br />17278 Golden Valley Parkway <br />Oakwood Shores - Area 1 <br />12921.000.003 <br />Victoria Drake <br />05/25/21 09:10 <br />Lathrop, CA 95330 <br />CLS Work Order #: 21E1113 <br />COC #: <br />Page 7 of 10 <br />Result Limit <br />Reporting <br />Units Level <br />Spike <br />Result <br />Source <br />%REC <br />%REC <br />Limits RPD <br />RPD <br />Limit Notes Analyte <br />Metals by EPA 6000/7000 Series Methods - Quality Control <br />Batch 2104161 - EPA 3050B <br />Blank (2104161-BLK1)Prepared: 05/21/21 Analyzed: 05/24/21 <br />Lead mg/kgND2.5 <br />Arsenic "ND 2.0 <br />LCS (2104161-BS1)Prepared: 05/21/21 Analyzed: 05/24/21 <br />Lead mg/kg10.6 2.5 10.0 75-125106 <br />Arsenic "10.3 2.0 10.0 75-125103 <br />Matrix Spike (2104161-MS1)Prepared: 05/21/21 Analyzed: 05/24/21 Source: 21E1113-01 <br />Lead mg/kg10.1 2.5 10.0 1.56 75-12585.5 <br />Arsenic "10.6 2.0 10.0 1.54 75-12590 <br />Matrix Spike Dup (2104161-MSD1)Prepared: 05/21/21 Analyzed: 05/24/21 Source: 21E1113-01 <br />Lead mg/kg9.30 2.5 10.0 1.56 3075-12577.3 8.40 <br />Arsenic "9.59 2.0 10.0 1.54 3075-12580 10 <br />3249 Fitzgerald Road, Rancho Cordova, CA 95742 | 800.638.7301 | Tel: 916.638.7301 x102 | Fax: 916.638.4510 | www.californialab.com <br />Small Business #2916 | ELAP #1233 | NAICS #541380 | CA SWRCB ELAP Accreditation /Registration Number 1233 Page 8 of 11