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giiaN lwm- •O Analytical Chemists May 29, 2026 Lab No. : STK2636935-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : May 13, 2026 at 08:50 1868 East Hazelton Ave. Sampled By : Rena LeRoy Stockton, CA 95205 Received On : May 13, 2026 at 09:40 Description :Wellhead Matrix : Drinking Water Project :23380 S. Austin Rd., Ripon- AP2400486 Sample Results - Inorganic General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 115 2.5 mg/L 05/15/2026 15:00 ac 2340B 05/15/2026 18:19 ac Calcium 33 1 mg/L 1 05/15/2026 15:00 ac EPA 200.7 05/15/2026 18:19 ac Magnesium 8 1 mg/L 1 05/15/2026 15:00 ac EPA 200.7 05/15/2026 18:19 ac Potassium 4 1 mg/L 1 05/15/2026 15:00 ac EPA 200.7 05/15/2026 18:19 ac Sodium 74 1 mg/L 1 05/15/2026 15:00 ac EPA 200.7 05/15/2026 18:19 ac Total Cations 5.6 -- meq/L 05/15/2026 15:00 ac Calc. 05/15/2026 18:19 ac Boron 0.2 0.1 mg/L 1 05/15/2026 15:00 ac EPA 200.7 05/15/2026 18:19 ac Copper ND 10 ug/L 1000, 1 U 05/15/2026 15:00 ac EPA 200.7 05/15/2026 18:19 ac Iron ND 30 ug/L 3001 1 U 05/15/2026 15:00 ac EPA 200.7 05/15/2026 18:19 ac Manganese ND 10 ug/L 502 1 U 05/15/2026 15:00 ac EPA 200.7 05/15/2026 18:19 ac Zinc ND 20 ug/L 5000 1 U 05/15/2026 15:00 ac EPA 200.7 05/15/2026 18:19 ac SAR 3.0 - 05/15/2026 15:00 ac Calc. 05/15/2026 18:19 ac Total Alkalinity(as CaCO3) 140 10 mg/L 1 05/18/2026 20:31 amm SM 4500-H+B 05/18/2026 22:46 amen Hydroxide as OH ND 10 mg/L 1 U 05/18/2026 20:31 amm SM 4500-H+B 05/18/2026 22:46 amm Carbonate as CO3 ND 10 mg/L 1 U 05/18/2026 20:31 amm SM 4500-H+B 05/18/2026 22:46 amm Bicarbonate as HCO3 170 10 mg/L 1 05/18/2026 20:31 amm SM 4500-H+B 05/18/2026 22:46 amm Sulfate 24.4 0.5 mg/L 5001 1 b 05/26/2026 08:34 ldm EPA 300.0 05/26/2026 22:23 ldm Chloride 56 1 mg/L 5001 1 b 05/26/2026 08:34 ldm EPA 300.0 05/26/2026 22:23 ldm Nitrate as NO3 39.3 0.4 mg/L 45 1 05/14/2026 15:15 mml SM 4500-NO3 F 05/14/2026 16:39 mml Nitrite as N ND 0.2 mg/L 1 1 U 05/14/2026 15:15 mml SM 4500-NO3 F 05/14/2026 16:37 mml. Nitrate+Nitrite as N 8.9 0.4 mg/L 10 1 05/14/2026 15:15 mml SM 4500-NO3 F 05/14/2026 16:39 mml Fluoride ND 0.1 mg/L 2 1 U 05/26/2026 08:34 ldm EPA 300.0 05/26/2026 22:23 ldm Total Anions 5.5 -- meq/L 05/26/2026 08:34 ldm Calc. 05/26/2026 22:23 ldm pH 7.8 -- units 1 05/13/2026 08:50 rl SM 4500-H+B 05/13/2026 08:50 rl Specific Conductance 561 1 umhos/cm 16002 1 05/18/2026 20:31 amm SM 4500-H+B 05/18/2026 22:46 amm Total Dissolved Solids 340 20 mg/L 10002 1 05/18/2026 11:30 ctl SM 2540 C 05/19/2026 11:15 ctl MBAS(Screen) Negative 0.1 mg/L 1 U 05/14/2026 18:41 mct SM 5540 C 05/14/2026 18:47 mct Aggressiveness Index 11.9 10 -- 05/15/2026 15:00 ac Calc. 05/15/2026 18:19 ac Langelier Index(20°C) 0.02 20 --- 05/15/2026 15:00 ac Calc. 05/15/2026 18:19 ac Nitrate Nitrogen 8.9 0.4 mg/L 10 1 05/14/2026 15:15 mml SM 4500-NO3 F 05/14/2026 16:39 mml DQF Flags Definition: 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 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