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- s4 ENVIRONMENTAL . Analytical Chernists December 17, 2025 Lab No. : STK2558219-003 Luhdorff&Scalmanini, Consulting Eng. Customer No.: 3012023 Attn:Jeanette Lovelis 500 First Street Sampled On : December 1, 2025 at 09:30 Woodland, CA 95695 Sampled By : Nate Plascencia Description South Tracy #3 Received On : December 1, 2025 at 14:05 Matrix : Drinking Water Project Water Monitoring Sample Results - Inorganic General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 257 2.5 mg/L 12/02/2025 12:58 ac Calc. 12/02/2025 18:41 ac Calcium 65 1 mg/L 1 12/02/2025 12:58 ac EPA 200.7 12/02/2025 18:41 ac Magnesium 23 1 mg/L 1 12/02/2025 12:58 ac EPA 200.7 12/02/2025 18:41 ac Potassium 2 1 mg/L 1 12/02/2025 12:58 ac EPA 200.7 12/02/2025 18:41 ac Sodium 71 1 mg/L 1 12/02/2025 12:58 ac EPA 200.7 12/02/2025 18:41 ac Total Cations 8.3 1 meq/L 12/02/2025 12:58 ac _ 12/02/2025 18:41 ac Boron 0.9 0.1 mg/L 1 12/02/2025 12:58 ac EPA 200.7 12/02/2025 18:41 ac Copper ND 10 ug/L 10002 1 U 12/02/2025 12:58 ac EPA 200.7 12/02/2025 18:41 ac Iron 260 30 ug/L 3002 1 12/02/2025 12:58 ac EPA 200.7 12/02/2025 18:41 ac Manganese ND 10 ug/L 502 1 U 12/02/2025 12:58 ac EPA 200.7 12/02/2025 18:41 ac Zinc ND 20 ug/L 5000 1 U 12/02/2025 12:58 ac EPA 200.7 12/02/2025 18:41 ac Total Alkalinity(as CaCO3) 180 10 mg/L 1 12/10/2025 13:56 amm SM 4500-H+B 12/10/2025 21:45 amm Hydroxide as OH ND 10 mg/L 1 U 12/10/2025 13:56 amm SM 4500-H+B 12/10/2025 21:45 amm Carbonate as CO3 ND 10 mg/L 1 U 12/10/2025 13:56 amm SM 4500-H+B 12/10/2025 21:45 amm Bicarbonate as HCO3 220 10 mg/L 1 12/10/2025 13:56 amm SM 4500-H+B 12/10/2025 21:45 amm Sulfate 160 0.5 mg/L 5002 1 b 12/09/2025 10:38 ldm EPA 300.0 12/09/2025 21:45 ldm Chloride 61 1 mg/L 5002 1 b 12/09/2025 10:38 ldm EPA 300.0 12/09/2025 21:45 lcim Nitrate as NO3 21.3 0.4 mg/L 45 1 12/02/2025 11:50 mml SM 4500-NO3 F 12/02/2025 13:23 mml Nitrite as N ND 0.2 mg/L 1 1 U 12/02/2025 11:50 mml SM 4500-NO3 F 12/02/2025 13:22 mml Nitrate+Nitrite as N 4.8 0.4 mg/L 10 1 12/02/2025 11:50 mml SM 4500-NO3 F 12/02/2025 13:23 mml Fluoride 0.2 0.1 mg/L 2 1 12/09/2025 10:38 ldm EPA 300.0 12/09/2025 21:45 ldm Total Anions 9.0 10 meq/L 12/09/2025 10:38 ldm _ 12/09/2025 21:45 ldm pH 7.4 --- units 1 12/01/2025 09:30 np SM 4500-H+B 12/01/2025 09:30 np Specific Conductance 847 1 umhos/cm 16002 1 12/10/2025 13:56 amm SM 4500-H+B 12/10/2025 21:45 amm Total Dissolved Solids 490 20 mg/L 1000, 1 12/03/2025 11:00 ctl SM 2540 C 12/04/2025 11:40 ctl Total Dissolved Solids(sum) 624 10 mg/L 12/02/2025 12:58 ac Calc. 12/02/2025 18:41 ac MBAs,Calc.as LAS,MW 320 ND 0.1 mg/L 0.52 1 U 12/02/2025 15:40 mct SM 5540 C 12/02/2025 18:37 mct Aggressiveness Index 11.9 10 --- 12/02/2025 12:58 ac Calc. 12/02/2025 18:41 ac Langeher Index(20°C) -0.0002 20 --- 12/02/2025 12:58 ac Calc. 12/02/2025 18:41 ac Nitrate Nitrogen 4.8 0.4 mg/L 10 1 12/02/2025 11:50 mml SM 4500-NO3 F 12/02/2025 13:23 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,Dil.=Dilution MCL= Maximum Contamination Level. 2-Secondary Standard.3-CDPH Notification Level.AL= Regulatory Action Level. Section:Sample Results Page 6 of 17 Page 6 of 17 Corporate Offices&Laboratory Office S Laboratory Office 6 Laboratory Office 3 Laboratory Office&Laboratory 853 Corporation Street 2500 Stagecoach Road 563 E.Lindo 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 Certffication No.1573 CA ELAP Certification No.1563 CA ELAP Certification No.2670 CA ELAP Certification No.2775 CA ELAP Certification No.2810