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ENVIRONMENTAL1WAGRICULTURAL Analytical Chemists May 15, 2026 Lab No. : STK2636373-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : May 5, 2026 at 09:27 1868 East Hazelton Ave. Sampled By : Sastina Thammavongsa Stockton, CA 95205 Received On : May 5, 2026 at 11:01 Description : Wellhead Matrix : Drinking Water Project : 744 S. Hewitt Rd.,Linden-WP2601553 Sample Results - Inorganic General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 86.1 2.5 mg/L 05/07/2026 12:30 ac 2340B 05/07/2026 22:57 ac Calcium 18 1 mg/L 1 05/07/2026 12:30 ac EPA 200.7 05/07/2026 22:57 ac Magnesium 10 1 mg/L 1 1 05/07/2026 12:30 ac EPA 200.7 05/07/2026 22:57 ac Potassium 4 1 mg/L 1 05/07/2026 12:30 ac EPA 200.7 05/07/2026 22:57 ac Sodium 14 1 mg/L 1 05/07/2026 12:30 ac EPA 200.7 05/07/2026 22:57 ac Total Cations 2.4 -- meq/L 05/07/2026 12:30 ac Calc. 05/07/2026 22:57 ac Boron ND 0.1 mg/L 1 U 05/07/2026 12:30 ac EPA 200.7 05/07/2026 22:57 ac Copper ND 10 ug/L 10002 1 U 05/07/2026 12:30 ac EPA 200.7 05/07/2026 22:57 ac Iron ND 30 ug/L 3002 1 U 05/07/2026 12:30 ac EPA 200.7 05/07/2026 22:57 ac Manganese ND 10 ug/L 502 1 U 05/07/2026 12:30 ac EPA 200.7 05/07/2026 22:57 ac Zinc ND 20 ug/L 5000 1 U 05/07/2026 12:30 ac EPA 200.7 05/07/2026 22:57 ac SAR 0.7 05/07/2026 12:30 ac Calc. 05/07/2026 22:57 ac Total Alkalinity(as CaCO3) 90 10 mg/L 1 05/13/2026 15:09 amm SM 4500-H+B 05/13/2026 20:52 amen Hydroxide as OH ND 10 mg/L 1 U 05/13/2026 15:09 amm SM 4500-H+B 05/13/2026 20:52 amm Carbonate as CO3 ND 10 mg/L 1 U 05/13/2026 15:09 amm SM 4500-H+B 05/13/2026 20:52 amm Bicarbonate as HCO3 110 10 mg/L 1 05/13/2026 15:09 amm SM 4500-H+B 05/13/2026 20:52 amen Sulfate 6.2 0.5 mg/L 5002 1 b 05/11/2026 08:45 Win EPA 300.0 05/12/2026 02:02 Idm Chloride 7 1 mg/L 5002 1 b 05/11/2026 08:45 Idm EPA 300.0 05/12/2026 02:02 Idm Nitrate as NO3 7.5 0.4 mg/L 45 1 05/06/2026 15:00 mml SM 4500-NO3 F 05/06/2026 17:01 mml Nitrite as N ND 0.2 mg/L 1 1 U 05/06/2026 15:00 mml SM 4500-NO3 F 05/06/2026 17:00 mml Nitrate+Nitrite as N 1.7 0.4 mg/L 10 1 05/06/2026 15:00 mml SM 4500-NO3 F 05/06/2026 17:01 mml Fluoride 0.1 0.1 mg/L 2 1 05/11/2026 08:45 Win EPA 300.0 05/12/2026 02:02 Idm Total Anions 2.3 - meq/L 05/11/2026 08:45 Idm Calc. 05/12/2026 02:02 Idm pH 7.4 -- units 1 05/05/2026 09:27 st SM 4500-H+B 05/05/2026 09:27 st Specific Conductance 230 1 umhos/cm 16001 1 05/13/2026 15:09 amm SM 4500-H+B 05/13/2026 20:52 amm Total Dissolved Solids 230 20 mg/L 10002 1 05/07/2026 10:45 ctl SM 2540 C 05/08/2026 11:15 ctl MBAs(Screen) Negative 0.1 mg/L 1 U 05/06/2026 18:56 mct SM 5540 C 05/06/2026 19:07 met Aggressiveness Index 11.0 10 --- 05/07/2026 12:30 ac Calc. 05/07/2026 22:57 ac Langelier Index(20°C) -0.8 20 --- 05/07/2026 12:30 ac Calc. 05/07/2026 22:57 ac Nitrate Nitrogen 1.7 0.4 mg/L 10 1 05/06/2026 15:00 mml SM 4500-NO3 F 05/06/2026 17:01 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 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)3435818 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