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ENV1R0NMENTALNWr,-AGRICULTURAL Analytical Chemists April 6, 2026 Lab No. : STK2633934-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : March 24, 2026 at 09:34 1868 East Hazelton Ave. Sampled By : Rena LeRoy Stockton, CA 95205 Received On : March 24, 2026 at 10:04 Description :Wellhead Matrix : Drinking Water Project :18163 S Carrolton Rd.Ripon- WP0043053 Sample Results - Inorganic Sample AnalysisGeneral Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 82.8 2.5 mg/L 03/26/2026 14:00 ac 2340B 03/26/2026 21:00 ac Calcium 20 1 mg/L 1 1 03/26/2026 14:00 ac EPA 200.7 03/26/2026 21:00 ac Magnesium 8 1 mg/L 1 1 03/26/2026 14:00 ac EPA 200.7 03/26/2026 21:00 ac Potassium 4 1 mg/L 1 03/26/2026 14:00 ac EPA 200.7 03/26/2026 21:00 ac Sodium 17 1 mg/L 1 03/26/2026 14:00 ac EPA 200.7 03/26/2026 21:00 ac Total Cations 2.5 meq/L 03/26/2026 14:00 ac Calc. 03/26/2026 21:00 ac Boron ND 0.1 mg/L 1 U 03/26/2026 14:00 ac EPA 200.7 03/26/2026 21:00 ac Copper ND 10 ug/L 10002 1 U 03/26/2026 14:00 ac EPA 200.7 03/26/2026 21:00 ac Iron ND 30 ug/L 3002 1 U 03/26/2026 14:00 ac EPA 200.7 03/26/2026 21:00 ac Manganese ND 10 ug/L 502 1 U 03/26/2026 14:00 ac EPA 200.7 03/26/2026 21:00 ac Zinc 40 20 ug/L 5000 1 03/26/2026 14:00 ac EPA 200.7 03/26/2026 21:00 ac SAR 0.8 03/26/2026 14:00 ac Calc. 03/26/2026 21:00 ac Total Alkalinity(as CaCO3) 90 10 mg/L 1 03/29/2026 19:46 amm SM 4500-H+B 03/30/2026 05:08 amm Hydroxide as OH ND 10 mg/L 1 U 03/29/2026 19:46 amm SM 4500-H+B 03/30/2026 05:08 amm Carbonate as CO3 ND 10 mg/L 1 U 03/29/2026 19:46 amm SM 4500-H+B 03/30/2026 05:08 amm Bicarbonate as HCO3 110 10 mg/L 1 03/29/2026 19:46 amm SM 4500-H+B 03/30/2026 05:08 amm Sulfate 6.7 0.5 mg/L 5002 1 04/01/2026 08:50 ldm EPA 300.0 04/01/2026 18:20 ldm Chloride 9 1 mg/L 5002 1 04/01/2026 08:50 ldm EPA 300.0 04/01/2026 18:20 ldm Nitrate as NO3 22.1 0.4 mg/L 45 1 03/25/2026 12:50 mml SM 4500-NO3 F 03/25/2026 13:47 mml Nitrite as N ND 0.2 mg/L 1 1 U 03/25/2026 12:50 mml SM 4500-NO3 F 03/25/2026 13:46 mml Nitrate+Nitrite as N 5.0 0.4 mg/L 10 1 03/25/2026 12:50 mml SM 4500-NO3 F 03/25/2026 13:47 mml Fluoride 0.2 0.1 mg/L 2 1 04/01/2026 08:50 ldm EPA 300.0 04/01/2026 18:20 ldm Total Anions 2.6 meq/L 04/01/2026 08:50 ldm Calc. 04/01/2026 18:20 ldm pH 7.8 --- units 1 03/24/2026 09:34 rl SM 4500-H+B 03/24/2026 09:34 rl Specific Conductance 253 1 umhos/cm 16002 1 03/29/2026 19:46 amm SM 4500-H+B 03/30/2026 05:08 amm Total Dissolved Solids 240 20 mg/L 10002 1 03/26/2026 13:00 ctl SM 2540 C 03/27/2026 12:00 ctl MBAS(Screen) Negative 0.1 mg/L 1 U 03/25/2026 17:24 met SM 5540 C 03/25/2026 17:31 met Aggressiveness Index 11.5 10 --- 03/26/2026 14:00 ac Calc. 03/26/2026 21:00 ac Langelier Index(20°C) -0.4 20 --- 03/26/2026 14:00 ac Calc. 03/26/2026 21:00 ac Nitrate Nitrogen 5.0 0.4 mg/L 10 1 03/25/2026 12:50 mml SM 4500-NO3 F 03/25/2026 13:47 mml DQF Flags Definition: 1 The MS/MSD did not meet QC criteria. 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.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