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ENVIRONMENTA�'�AGRICULTURAL Analytical Chemists June 9, 2026 Lab No. : STK2637406-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : May 20, 2026 at 08:46 1868 East Hazelton Ave. Sampled By : Sastina T lammavongsa Stockton, CA 95205 Received On : May 20, 2026 at 09:14 Description :Well Head Matrix : Drinking Water Project :1349 Drais Road,Stockton- WP2601605 Sample Results - Inorganic General Mineral Date Time Who Method Date Time Who Total Hardness as CaCC3 77.8 2.5 mg/L 05/22/2026 09:00 ac 2340B 05/22/2026 17:17 ac Calcium 18 1 mg/L 1 05/22/2026 09:00 ac EPA 200.7 05/22/2026 17:17 ac Magnesium 8 1 mg/L 1 05/22/2026 09:00 ac EPA 200.7 05/22/2026 17:17 ac Potassium 4 1 mg/L 1 05/22/2026 09:00 ac EPA 200.7 05/22/2026 17:17 ac Sodium 18 1 mg/L 1 05/22/2026 09:00 ac EPA 200.7 05/22/2026 17:17 ac Total Cations 2.4 meq/L 05/22/2026 09:00 ac Calc. 05/22/2026 17:17 ac Boron ND 0.1 mg/L 1 U 05/22/2026 09:00 ac EPA 200.7 05/22/2026 17:17 ac Capper ND 10 ug/L 1000, 1 U 05/22/2026 09:00 ac EPA 200.7 05/22/2026 17:17 ac Iron 30 30 ug/L 3001 1 05/22/2026 09:00 ac EPA 200.7 05/22/2026 17:17 ac Manganese 20 10 ug/L 50' 1 05/22/2026 09:00 ac EPA 200.7 05/22/2026 17:17 ac Zinc 160 20 ug/L 5000 1 05/22/2026 09:00 ac EPA 200.7 05/22/2026 17:17 ac SAR 0.9 05/22/2026 09:00 ac Calc. 05/22/2026 17:17 ac Total Alkalinity(as CaCO3) 100 10 mg/L 1 I 05/30/2026 18:23 amm SM 4500-H+B 05/31/2026 04:52 amm Hydroxide as OH ND 10 mg/L 1 U 05/30/2026 18:23 amm SM 4500-H+B 05/31/2026 04:52 amm Carbonate as CO3 ND 10 mg/L 1 UI 05/30/2026 18:23 amm SM 4500-H+B 05/31/2026 04:52 amm Bicarbonate as HCO3 120 10 mg/L 1 05/30/2026 18:23 amm SM 4500-H+B 05/31/2026 04:52 amm Sulfate 8.3 0.5 mg/L 5001 1 05/28/2026 07:50 ldm EPA 300.0 05/28/2026 15:14 ldm Chloride 18 1 mg/L 5002 1 05/28/2026 07:50 ldm EPA 300.0 05/28/2026 15:14 ldm Nitrate as NO3 6.9 0.4 mg/L 45 1 05/21/2026 15:15 mml SM 4500-NO3 F 05/21/2026 17:02 mml Nitrite as N ND 0.2 mg/L 1 1 U 05/21/2026 15:15 mml SM 4500-NO3 F 05/21/2026 16:59 mml Nitrate+Nitrite as N 1.6 0.4 mg/L 10 1 05/21/2026 15:15 mml SM 4500-NO3 F 05/21/2026 17:02 mml Fluoride 0.1 0.1 mg/L 2 1 05/28/2026 07:50 ldm EPA 300.0 05/28/2026 15:14 ldm Total Anions 2.8 meq/L 05/28/2026 07:50 ldm Calc. 05/28/2026 15:14 ldm pH 7.4 - units 1 05/20/2026 08:46 st SM 4500-H+B 05/20/2026 08:46 st Specific Conductance 278 1 umhos/cm 1600' 1 I 05/30/2026 18:23 amm SM 4500-H+B 05/31/2026 04:52 amm Total Dissolved Solids 210 20 mg/L 1000, 1 05/26/2026 13:00 ctl SM 2540 C 05/27/2026 11:45 ctl MBAS(Screen) Negative 0.1 mg/L 1 U 05/21/2026 21:15 mct SM 5540 C 05/21/2026 21:58 mct Aggressiveness Index 11.1 10 --- 05/22/2026 09:00 ac Calc. 05/22/2026 17:17 ac Langelier Index(20°C) -0.8 20 --- 05/22/2026 09:00 ac Calc. 05/22/2026 17:17 ac Nitrate Nitrogen 1.6 0.4 mg/L 10 1 05/21/2026 15:15 mml SM 4500-NO3 F 05/21/2026 17:02 mml DQF Flags Definition: U Constituent results were non-detect. I The RPD for the laboratory duplicate exceeded laboratory criteria. 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.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 Certification No.1573 CA ELAP Certification No.1563 CA ELAP Certification No.2670 CA ELAP Certification No.2775 CA ELAP Certification No.2810