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.O `AGRICULTURAL Analytical Chemists October 6, 2026 Lab No. : STK2654537-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : September 24, 2026 at 10:00 1868 East Hazelton Ave. Sampled By : Aaron Gooderham Stockton, CA 95205 Received On : September 24, 2026 at 13:00 Description Wellhead Matrix : Drinking Water Project 10943 Hwy. 12 Victor CA Sample Results - Inorganic Sample AnalysisGeneral Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 18.2 2.5 mg/L 09/28/2026 11:00 ac 2340B 09/28/2026 20:30 ac Calcium 4 1 mg/L 1 1 09/28/2026 11:00 ac EPA 200.7 09/28/2026 20:30 ac Magnesium 2 1 mg/L 1 1 09/28/2026 11:00 ac EPA 200.7 09/28/2026 20:30 ac Potassium 1 1 mg/L 1 09/28/2026 11:00 ac EPA 200.7 09/28/2026 20:30 ac Sodium 8 1 mg/L 1 1 09/28/2026 11:00 ac EPA 200.7 09/28/2026 20:30 ac Total Cations 0.7 meq/L 09/28/2026 11:00 ac Calc. 09/28/2026 20:30 ac Boron ND 0.1 mg/L 1 U 09/28/2026 11:00 ac EPA 200.7 09/28/2026 20:30 ac Copper ND 10 ug/L 10002 1 U 09/28/2026 11:00 ac EPA 200.7 09/28/2026 20:30 ac Iron ND 30 ug/L 3002 1 U 09/28/2026 11:00 ac EPA 200.7 09/28/2026 20:30 ac Manganese ND 10 ug/L 502 1 U 09/28/2026 11:00 ac EPA 200.7 09/28/2026 20:30 ac Zinc ND 20 ug/L 5000 1 U 09/28/2026 11:00 ac EPA 200.7 09/28/2026 20:30 ac SAR 0.8 09/28/2026 11:00 ac Calc. 09/28/2026 20:30 ac Total Alkalinity(as CaCO3) 30 10 mg/L 1 09/29/2026 11:25 amm SM 2320 B 09/29/2026 13:28 amm Hydroxide as OH ND 10 mg/L 1 U 09/29/2026 11:25 amm SM 2320 B 09/29/2026 13:28 amm Carbonate as CO3 ND 10 mg/L 1 U 09/29/2026 11:25 amm SM 2320 B 09/29/2026 13:28 amm Bicarbonate as HCO3 40 10 mg/L 1 09/29/2026 11:25 amm SM 2320 B 09/29/2026 13:28 amm Sulfate 2.0 0.5 mg/L 5002 1 b 09/30/2026 09:29 Win EPA 300.0 10/01/2026 00:31 ldm Chloride 2 1 mg/L 5002 1 b 09/30/2026 09:29 ldm EPA 300.0 10/01/2026 00:31 ldm Nitrate as NO3 0.6 0.4 mg/L 45 1 U 09/25/2026 12:15 mml SM 4500-NO3 F 09/25/2026 12:46 mml Nitrite as N ND 0.2 mg/L 1 1 U 09/25/2026 12:15 mml SM 4500-NO3 F 09/25/2026 12:44 mml Nitrate+Nitrite as N ND 0.4 mg/L 10 1 U 09/25/2026 12:15 mml SM 4500-NO3 F 09/25/2026 12:46 mml Fluoride 0.2 0.1 mg/L 2 1 09/30/2026 09:29 ldm EPA 300.0 10/01/2026 00:31 ldm Total Anions 0.8 meq/L 09/30/2026 09:29 ldm Calc. 10/01/2026 00:31 ldm pH 7.8 --- units 1 09/24/2026 10:00 ag SM 4500-H+B 09/24/2026 10:00 ag Specific Conductance 80.0 1 umhos/cm 16002 1 09/29/2026 11:25 amm SM 2320 B 09/29/2026 13:28 amm Total Dissolved Solids 70 20 mg/L 10002 1 09/28/2026 13:15 ctl SM 2540 C 09/29/2026 11:35 ctl MBAS(Screen) Negative 0.1 mg/L 1 U 09/25/2026 17:26 mct SM 5540 C 09/25/2026 17:34 mct Aggressiveness Index 10.3 10 --- 09/28/2026 11:00 ac Calc. 09/28/2026 20:30 ac Langelier Index(20°C) -1.5 20 --- 09/28/2026 11:00 ac Calc. 09/28/2026 20:30 ac Nitrate Nitrogen ND 0.4 mg/L 10 1 U 09/25/2026 12:15 mml SM 4500-NO3 F 09/25/2026 12:46 mml DQF Flags Definition: 1 The MS/MSD did not meet QC criteria. 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 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