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ENV IRON M ENTALITMAGRICULTURAL Analytical Chemists December 17, 2025 Lab No. : STK2558392-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : December 3, 2025 at 08:14 1868 East Hazelton Ave. Sampled By : Sastina Thammavongsa Stockton, CA 95205 Received On : December 3, 2025 at 08:58 Description :Well Head Matrix : Drinking Water Project :7806 S. Borba Road Stockton/ WP0042779 Sample Results - Inorganic General Mineral Date Time Who Method Date Time Who Total Hardness as CaCC3 110 2.5 mg/L 12/06/2025 06:00 ac 2340B 12/06/2025 13:41 ac Calcium 21 1 mg/L 1 12/06/2025 06:00 ac EPA 200.7 12/06/2025 13:41 ac Magnesium 14 1 mg/L 1 12/06/2025 06:00 ac EPA 200.7 12/06/2025 13:41 ac Potassium ND 1 mg/L 1 U 12/06/2025 06:00 ac EPA 200.7 12/06/2025 13:41 ac Sodium 204 1 mg/L 1 12/06/2025 06:00 ac EPA 200.7 12/06/2025 13:41 ac Total Cations 11.1 1 meq/L 12/06/2025 06:00 ac Calc. 12/06/2025 13:41 ac Boron 0.4 0.1 mg/L 1 12/06/2025 06:00 ac EPA 200.7 12/06/2025 13:41 ac Copper ND 10 ug/L 1000' 1 U 12/06/2025 06:00 ac EPA 200.7 12/06/2025 13:41 ac Iron ND 30 ug/L 300' 1 U 12/06/2025 06:00 ac EPA 200.7 12/06/2025 13:41 ac Manganese 130 10 ug/L 50' 1 12/06/2025 06:00 ac EPA 200.7 12/06/2025 13:41 ac Zinc ND 20 ug/L 5000 1 U 12/06/2025 06:00 ac EPA 200.7 12/06/2025 13:41 ac SAR 8.5 - 12/06/2025 06:00 ac Calc. 12/06/2025 13:41 ac Total Alkalinity(as CaCO3) 210 10 mg/L 1 12/14/2025 21:37 amm SM 4500-H+B 12/15/2025 05:05 amm Hydroxide as OH ND 10 mg/L 1 U 12/14/2025 21:37 amm SM 4500-H+B 12/15/2025 05:05 amm Carbonate as CO3 ND 10 mg/L 1 U 12/14/2025 21:37 amm SM 4500-H+B 12/15/2025 05:05 amm Bicarbonate as HCO3 260 10 mg/L 1 12/14/2025 21:37 amm SM 4500-H+B 12/15/2025 05:05 amm Sulfate 98.7 0.5 mg/L 500' 1 b 12/11/2025 09:28 ldm EPA 300.0 12/12/2025 02:21 Idm Chloride 200 4* mg/L 500' 4 b 12/11/2025 09:28 ldm EPA 300.0 12/12/2025 11:54 Idm Nitrate as NO3 24.0 0.4 mg/L 45 1 12/04/2025 14:25 mml SM 4500-NO3 F 12/04/2025 16:45 mml Nitrite as N ND 0.2 mg/L 1 1 U 12/04/2025 14:25 mml SM 4500-NO3 F 12/04/2025 16:43 mml Nitrate+Nitrite as N 5.4 0.4 mg/L 10 1 12/04/2025 14:25 mml SM 4500-NO3 F 12/04/2025 16:45 mml Fluoride 0.4 0.1 mg/L 2 1 12/11/2025 09:28 Idm EPA 300.0 12/12/2025 02:21 Idm Total Anions 12.3 10 meq/L 12/11/2025 09:28 Idm Calc. 12/12/2025 11:54 Idm pH 8.0 --- units 1 12/03/2025 08:14 st SM 4500-H+B 12/03/2025 08:14 st Specific Conductance 1220 1 umhos/cm 1600' 1 12/14/2025 21:37 amm SM 4500-H+B 12/15/2025 05:05 amm Total Dissolved Solids 680 20 mg/L 1000' 1 12/05/2025 10:30 ctl SM 2540 C 12/08/2025 11:15 ctl MBAs(Screen) Negative 0.1 mg/L 1 U 12/04/2025 18:35 mct SM 5540 C 12/04/2025 18:41 mct Aggressiveness Index 12.0 10 --- 12/06/2025 06:00 ac Calc. 12/06/2025 13:41 ac Langelier Index(20°C) 0.2 20 --- 12/06/2025 06:00 ac Calc. 12/06/2025 13:41 ac Nitrate Nitrogen 5.4 0.4 mg/L 10 1 12/04/2025 14:25 mml SM 4500-NO3 F 12/04/2025 16:45 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*RL adjusted for dilution, 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.Undo Avenue 3442 Empress 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