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ENVIRONMENTAL Analytical Chemists December 22, 2025 Lab No. : STK2558606-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : December 8, 2025 at 08:17 1868 East Hazelton Ave. Sampled By : Sastina Thammavongsa Stockton, CA 95205 Received On : December 8, 2025 at 08:40 Description :Wellhead Matrix : Drinking Water Project :18660 E. Tobacco Road, Linden- WP0043911 Sample Results - Inorganic �m ®®® Sample Analysis General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 86.1 2.5 mg/L 12/09/2025 12:00 ac 2340B 12/09/2025 17:02 ac Calcium 18 1 mg/L 1 12/09/2025 12:00 ac EPA 200.7 12/09/2025 17:02 ac Magnesium 10 1 mg/L 1 12/09/2025 12:00 ac EPA 200.7 12/09/2025 17:02 ac Potassium 5 1 mg/L 1 12/09/2025 12:00 ac EPA 200.7 12/09/2025 17:02 ac Sodium 16 1 mg/L 1 12/09/2025 12:00 ac EPA 200.7 12/09/2025 17:02 ac Total Cations 2.5 1 meq/L 12/09/2025 12:00 ac Calc. 12/09/2025 17:02 ac Boron ND 0.1 mg/L 1 U 12/09/2025 12:00 ac EPA 200.7 12/09/2025 17:02 ac Copper ND 10 ug/L 10002 1 U 12/09/2025 12:00 ac EPA 200.7 12/09/2025 17:02 ac Iron 30 30 ug/L 3002 1 12/09/2025 12:00 ac EPA 200.7 12/09/2025 17:02 ac Manganese ND 10 ug/L 502 1 U 12/09/2025 12:00 ac EPA 200.7 12/09/2025 17:02 ac Zinc ND 20 ug/L 5000 1 U 12/09/2025 12:00 ac EPA 200.7 12/09/2025 17:02 ac SAR 0.8 - 12/09/2025 12:00 ac Calc. 12/09/2025 17:02 ac Total Alkalinity(as CaCO3) 100 10 mg/L 1 12/10/2025 13:56 amen SM 4500-H+B 12/11/2025 01:15 amm Hydroxide as OH ND 10 mg/L 1 UI 12/10/2025 13:56 amm SM 4500-H+B 12/11/2025 01:15 amm Carbonate as CO3 ND 10 mg/L 1 UI 12/10/2025 13:56 amen SM 4500-H+B 12/11/2025 01:15 amm Bicarbonate as HCO3 120 10 mg/L 1 12/10/2025 13:56 amen SM 4500-H+B 12/11/2025 01:15 amm Sulfate 13.1 0.5 mg/L 500' 1 b 12/15/2025 11:12 Idm EPA 300.0 12/16/2025 00:24 Win Chloride 5 1 mg/L 500' 1 b 12/15/2025 11:12 Idm EPA 300.0 12/16/2025 00:24 Win Nitrate as NO3 2.6 0.4 mg/L 45 1 12/09/2025 11:45 mml SM 4500-NO3 F 12/09/2025 13:12 mml Nitrite as N ND 0.2 mg/L 1 1 U 12/09/2025 11:45 mml SM 4500-NO3 F 12/09/2025 13:10 mml Nitrate+Nitrite as N 0.6 0.4 mg/L 10 1 12/09/2025 11:45 mml SM 4500-NO3 F 12/09/2025 13:12 mml Fluoride 0.1 0.1 mg/L 2 1 12/15/2025 11:12 Idm EPA 300.0 12/16/2025 00:24 Idm Total Anions 2.4 10 meq/L 12/15/2025 11:12 Idm Calc. 12/16/2025 00:24 Win pH 8.3 - units 1 12/08/2025 08:17 st SM 4500-H+B 12/08/2025 08:17 st Specific Conductance 244 1 umhos/cm 16001 1 12/10/2025 13:56 amen SM 4500-H+B 12/11/2025 01:15 amm Total Dissolved Solids 190 20 mg/L 10002 1 12/10/2025 10:50 ctl SM 2540 C 12/11/2025 13:00 ctl MBAs(Screen) Negative 0.1 mg/L 1 U 12/09/2025 19:16 mct SM 5540 C 12/09/2025 19:23 mct Aggressiveness Index 12.0 10 --- 12/09/2025 12:00 ac Calc. 12/09/2025 17:02 ac Langelier Index(20°C) 0.1 20 --- 12/09/2025 12:00 ac Calc. 12/09/2025 17:02 ac Nitrate Nitrogen 0.6 0.4 mg/L 10 1 12/09/2025 11:45 mml SM 4500-NO3 F 12/09/2025 13:12 mml DQF Flags Definition: U Constituent results were non-detect. I The RPD for the laboratory duplicate exceeded laboratory criteria. b The Blank was positive for constituent but less than the PQL ND=Non-Detected,RL=Reporting Level,Di1.=Dilution MCL=Maximum Contamination Level.2-Secondary Standard.3-CDPH Notification Level.AL= Regulatory Action Level. Section:Sample Results Page 2 of 8 Page 2 of 8 Corporate Offices&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory Office&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