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ENVIRONMENTAL AGRICULTURAL Analytical Chemists March 27, 2026 Lab No. : STK2633435-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : March 11, 2026 at 10:02 1868 East Hazelton Ave. Sampled By : Rena LeRoy Stockton, CA 95205 Received On : March 11, 2026 at 11:55 Description : Wellhead Matrix : Drinking Water Project 17074 Colony Rd,Ripon-WP2501249 Sample Results - Inorganic miff ff-PSMOMMM General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 261 2.5 mg/L 03/17/2026 12:15 ac 2340B 03/17/2026 19:46 ac Calcium 65 1 mg/L 1 03/17/2026 12:15 ac EPA 200.7 03/17/2026 19:46 ac Magnesium 24 1 mg/L 1 03/17/2026 12:15 ac EPA 200.7 03/17/2026 19:46 ac Potassium 5 1 mg/L 1 03/17/2026 12:15 ac EPA 200.7 03/17/2026 19:46 ac Sodium 24 1 mg/L 1 03/17/2026 12:15 ac EPA 200.7 03/17/2026 19:46 ac Total Cations 6.4 meq/L 03/17/2026 12:15 ac Calc. 03/17/2026 19:46 ac Boron ND 0.1 mg/L 1 U 03/17/2026 12:15 ac EPA 200.7 03/17/2026 19:46 ac Copper ND 10 ug/L 10002 1 U 03/17/2026 12:15 ac EPA 200.7 03/17/2026 19:46 ac Iron ND 30 ug/L 3002 1 U 03/17/2026 12:15 ac EPA 200.7 03/17/2026 19:46 ac Manganese ND 10 ug/L 502 1 U 03/17/2026 12:15 ac EPA 200.7 03/17/2026 19:46 ac Zinc 90 20 ug/L 5000 1 03/17/2026 12:15 ac EPA 200.7 03/17/2026 19:46 ac SAR 0.6 - 03/17/2026 12:15 ac Calc. 03/17/2026 19:46 ac Total Alkalinity(as CaCO3) 170 10 mg/L 1 03/16/2026 17:56 amm SM 4500-H+B 03/17/2026 04:52 amm Hydroxide as OH ND 10 mg/L 1 U 03/16/2026 17:56 amm SM 4500-H+B 03/17/2026 04:52 amm Carbonate as CO3 ND 10 mg/L 1 U 03/16/2026 17:56 amm SM 4500-H+B 03/17/2026 04:52 amm Bicarbonate as HCO3 210 10 mg/L 1 03/16/2026 17:56 amm SM 4500-H+B 03/17/2026 04:52 amm Sulfate 65.4 0.5 mg/L 5002 1 03/23/2026 08:52 ldm EPA 300.0 03/23/2026 18:31 ldm Chloride 12 1 mg/L 5002 1 03/23/2026 08:52 ldm EPA 300.0 03/23/2026 18:31 ldm Nitrate as NO3 70.4 0.4 mg/L 45 1 03/12/2026 13:30 mini SM 4500-NO3 F 03/12/2026 14:53 mml Nitrite as N ND 0.2 mg/L 1 1 U 03/12/2026 13:30 mml SM 4500-NO3 F 03/12/2026 14:51 mml Nitrate+Nitrite as N 15.9 0.4 mg/L 10 1 03/12/2026 13:30 mml SM 4500-NO3 F 03/12/2026 14:53 mml Fluoride 0.1 0.1 mg/L 2 1 03/23/2026 08:52 ldm EPA 300.0 03/23/2026 18:31 ldm Total Anions 6.3 meq/L 03/23/2026 08:52 ldm Calc. 03/23/2026 18:31 ldm pH 7.2 --- units 1 03/11/2026 10:02 rl SM 4500-H+B 03/11/2026 10:02 rl Specific Conductance 600 1 umhos/cm 16002 1 03/16/2026 17:56 amm SM 4500-H+B 03/17/2026 04:52 amm Total Dissolved Solids 470 20 mg/L 10002 1 03/16/2026 10:30 ctl SM 2540 C 03/17/2026 11:00 ctl MBAs(Screen) Negative 0.1 mg/L 1 U 03/12/2026 19:00 mct SM 5540 C 03/12/2026 19:11 mct Aggressiveness Index 11.6 10 --- 03/17/2026 12:15 ac Calc. 03/17/2026 19:46 ac Langelier Index(20°C) -0.2 20 --- 03/17/2026 12:15 ac Calc. 03/17/2026 19:46 ac Nitrate Nitrogen 15.9 0.4 mg/L 10 1 03/12/2026 13:30 mml SM 4500-NO3 F 03/12/2026 14:53 mml DQF Flags Definition: U Constituent results were non-detect. 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.Lando 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