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ENVIRONMENTAL Analytical C'hemists June 10, 2025 Lab No. : STK2537025-003 Luhdorff&Scalmanini, Consulting Eng. Customer No.: 3012023 Attn:Jeanette Lovelis 500 First Street Sampled On : May 14, 2025 at 09:27 Woodland, CA 95695 Sampled By : Nate Plascencia Received On : May 14, 2025 at 14:39 Description South Tracy #3 Matrix : Drinking Water Project Water Monitoring Sample Results - Inorganic General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 252 2.5 mg/L 05/16/2025 11:00 ac Calc. 05/16/2025 22:20 ac Calcium 63 1 mg/L 1 05/16/2025 11:00 ac EPA 200.7 05/16/2025 22:20 ac Magnesium 23 1 mg/L 1 05/16/2025 11:00 ac EPA 200.7 05/16/2025 22:20 ac Potassium 2 1 mg/L 1 05/16/2025 11:00 ac EPA 200.7 05/16/2025 22:20 ac Sodium 81 1 mg/L 1 05/16/2025 11:00 ac EPA 200.7 05/16/2025 22:20 ac Total Cations 8.6 1 meq/L 05/16/2025 11:00 ac - 05/16/2025 22:20 ac Boron 1.1 0.1 mg/L 1 05/16/2025 11:00 ac EPA 200.7 05/16/2025 22:20 ac Copper 20 10 ug/L 1000, 1 05/16/2025 11:00 ac EPA 200.7 05/16/2025 22:20 ac Iron 30 30 ug/L 3002 1 05/16/2025 11:00 ac EPA 200.7 05/16/2025 22:20 ac Manganese ND 10 ug/L 502 1 U 05/16/2025 11:00 ac EPA 200.7 05/16/2025 22:20 ac Zinc ND 20 ug/L 5000 1 U 05/16/2025 11:00 ac EPA 200.7 05/16/2025 22:20 ac Total Alkalinity(as CaCO3) 160 10 mg/L 1 05/19/2025 21:41 amm SM 4500-H+B 05/20/2025 08:26 amm Hydroxide as OH ND 10 mg/L 1 U 05/19/2025 21:41 amm SM 4500-H+B 05/20/2025 08:26 amm Carbonate as CO3 ND 10 mg/L 1 U 05/19/2025 21:41 amm SM 4500-H+B 05/20/2025 08:26 amm Bicarbonate as HCO3 200 10 mg/L 1 05/19/2025 21:41 amm SM 4500-H+B 05/20/2025 08:26 amm Sulfate 182 0.5 mg/L 500' 1 b 05/20/2025 11:21 ldm EPA 300.0 05/21/2025 04:35 ldm Chloride 69 1 mg/L 5001 1 b 05/20/2025 11:21 ldm EPA 300.0 05/21/2025 04:35 ldm Nitrate as NO3 15.5 0.4 mg/L 45 1 05/15/2025 16:24 mml SM 4500-NO3 F 05/15/2025 19:14 mmi Nitrite as N ND 0.2 mg/L 1 1 U 05/15/2025 16:24 mml SM 4500-NO3 F 05/15/2025 19:15 mml Nitrate+Nitrite as N 3.5 0.4 mg/L 10 1 05/15/2025 16:24 mml SM 4500-NO3 F 05/15/2025 19:14 mml Fluoride 0.3 0.1 mg/L 2 1 05/20/2025 11:21 ldm EPA 300.0 05/21/2025 04:35 ldm Total Anions 9.3 10 meq/L 05/20/2025 11:21 Idm _ 05/21/2025 04:35 ldm pH 8.3 - units 1 05/14/2025 09:27 np SM 4500-H+B 05/14/2025 09:27 np Specific Conductance 867 1 umhos/cm 16001 1 05/19/2025 21:41 amm SM 4500-H+B 05/20/2025 08:26 amm Total Dissolved Solids 540 10 mg/L 10001 1 05/19/2025 11:45 ctl SM 2540 C 05/20/2025 11:30 ctl Total Dissolved Solids(sum) 636 10 mg/L 05/16/2025 11:00 ac Calc. 05/16/2025 22:20 ac MBAs,Calc.as LAS,MW 320 ND 0.1 mg/L 0.52 1 U 05/15/2025 19:43 mct SM 5540 C 05/15/2025 20:20 mct Aggressiveness Index 12.7 10 -- 05/16/2025 11:00 ac Calc. 05/16/2025 22:20 ac Langelier Index(20°C) 0.8 10 - 05/16/2025 11:00 ac Calc. 05/16/2025 22:20 ac Nitrate Nitrogen 3.5 0.4 mg/L 10 1 05/15/2025 16:24 mml SM 4500-NO3 F 05/15/2025 19:14 mml DQF Flags Definition: U Constituent results were non-detect. b The Blank was positive for constituent but less than the PQL ND=Non-Detected,RL=Reporting Level*RL adjusted for dilution,Di1.=Dilution MCL=Maximum Contamination Level. 2-Secondary Standard.3-CDPH Notification Level.AL=Regulatory Action Level. Section: Sample Results Page 7 of 21 Page 7 of 21 Corporate Offices 3 Laboratory Office&Laboratory Office 3 Laboratory Office 6 Laboratory Office 3 Laboratory 853 Corporation Street 2500 Stagecoach Road 563 E.Undo Avenue 3442 Empresa Drive,Suite D 9411 W.Goshen Avenue Santa Paula,CA 93060 Stockton,CA 95215 Chico,CA 95926 San Luis Obispo,CA 93401 Visalia,CA 93291 TEL:(805)392-2000 TEL:(209)942-0182 TEL:(530)343-5818 TEL:(805)783-2940 TEL:(559)734-9473 CA ELAP Certification No.1573 CA ELAP Certification No.1563 CA ELAP Certification No.2670 CA ELAP Certification No.2775 CA ELAP Certification No.2810