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ENVIRONMENTAL—- Analytical Chemists June 9, 2026 Lab No. : STK2637324-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : May 19, 2026 at 08:35 1868 East Hazelton Ave. Sampled By : Sastina Thammavongsa Stockton, CA 95205 Received On : May 19, 2026 at 09:11 Description Wellhead Matrix : Drinking Water Project 30444 E State Route 4-WP2400098 Sample Results - Inorganic WALlilaw General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 70.3 2.5 mg/L 05/21/2026 10:00 ac 2340B 05/21/2026 13:35 ac Calcium 15 1 mg/L 1 05/21/2026 10:00 ac EPA 200.7 05/21/2026 13:35 ac Magnesium 8 1 mg/L 1 05/21/2026 10:00 ac EPA 200.7 05/21/2026 13:35 ac Potassium 3 1 mg/L 1 05/21/2026 10:00 ac EPA 200.7 05/21/2026 13:35 ac Sodium 16 1 mg/L 1 05/21/2026 10:00 ac EPA 200.7 05/21/2026 13:35 ac Total Cations 2.2 meq/L 05/21/2026 10:00 ac Calc. 05/21/2026 13:35 ac Boron ND 0.1 mg/L 1 U 05/21/2026 10:00 ac EPA 200.7 05/21/2026 13:35 ac Copper ND 10 ug/L 1000, 1 U 05/21/2026 10:00 ac EPA 200.7 05/21/2026 13:35 ac Iron ND 30 ug/L 3002 1 U 05/21/2026 10:00 ac EPA 200.7 05/21/2026 13:35 ac Manganese ND 10 ug/L 502 1 U 05/21/2026 10:00 ac EPA 200.7 05/21/2026 13:35 ac Zinc 20 20 ug/L 5000 1 05/21/2026 10:00 ac EPA 200.7 05/21/2026 13:35 ac SAR 0.8 - 05/21/2026 10:00 ac Calc. 05/21/2026 13:35 ac Total Alkalinity(as CaCO3) 80 10 mg/L 1 05/22/2026 13:16 amm SM 4500-H+B 05/23/2026 03:38 amm Hydroxide as OH ND 10 mg/L 1 U 05/22/2026 13:16 amm SM 4500-H+B 05/23/2026 03:38 amm Carbonate as CO3 ND 10 mg/L 1 U 05/22/2026 13:16 amm SM 4500-H+B 05/23/2026 03:38 amm Bicarbonate as HCO3 100 10 mg/L 1 05/22/2026 13:16 amm SM 4500-H+B 05/23/2026 03:38 amm Sulfate 8.4 0.5 mg/L 5002 1 05/28/2026 07:50 ldm EPA 300.0 05/28/2026 15:29 Idm Chloride 14 1 mg/L 5002 1 05/28/2026 07:50 Idm EPA 300.0 05/28/2026 15:29 Idm Nitrate as NO3 8.5 0.4 mg/L 45 1 05/20/2026 12:40 mml SM 4500-NO3 F 05/20/2026 14:24 mml Nitrite as N ND 0.2 mg/L 1 1 U 05/20/2026 12:40 mral SM 4500-NO3 F 05/20/2026 14:22 rami Nitrate+Nitrite as N 1.9 0.4 mg/L 10 1 05/20/2026 12:40 rami SM 4500-NO3 F 05/20/2026 14:24 mml Fluoride 0.1 0.1 mg/L 2 1 05/28/2026 07:50 ldm EPA 300.0 05/28/2026 15:29 Idm Total Anions 2.3 meq/L 05/28/2026 07:50 Idm Calc. 05/28/2026 15:29 Idm pH 7.4 --- units 1 05/19/2026 08:35 st SM 4500-H+B 05/19/2026 08:35 st Specific Conductance 234 1 umhos/cm 16002 1 05/22/2026 13:16 amm SM 4500-H+B 05/23/2026 03:38 amm Total Dissolved Solids 190 20 mg/L 10002 1 05/22/2026 10:00 ctl SM 2540 C 05/26/2026 10:30 cd MBAS(Screen) Negative 0.1 mg/L 1 U 05/20/2026 18:04 met SM 5540 C 05/20/2026 18:24 met Aggressiveness Index 10.9 10 --- 05/21/2026 10:00 ac Calc. 05/21/2026 13:35 ac Langelier Index(20°C) -0.9 20 --- 05/21/2026 10:00 ac Calc. 05/21/2026 13:35 ac Nitrate Nitrogen 1.9 0.4 mg/L 10 1 05/20/2026 12:40 mml SM 4500-NO3 F 05/20/2026 14:24 mml DQF Flags Definition: U Constituent results were non-detect. 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 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.Linda 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