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ENVIRONMENTAL - AGRICULTURAL Analytical Chemists July 21, 2026 Lab No. : STK2639982-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On :July 7, 2026 at 09:46 1868 East Hazelton Ave. Sampled By : Sastina Thammavongsa Stockton, CA 95205 Received On :July 7, 2026 at 10:15 Description Wellhead Matrix : Drinking Water Project 8348 N Simi Ct-WP2500707 Sample Results - Inorganic MUr General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 133 2.5 mg/L 07/09/2026 10:00 ac 2340B 07/09/2026 20:26 ac Calcium 27 1 mg/L 1 07/09/2026 10:00 ac EPA 200.7 07/09/2026 20:26 ac Magnesium 16 1 mg/L 1 07/09/2026 10:00 ac EPA 200.7 07/09/2026 20:26 ac Potassium 4 1 mg/L 1 07/09/2026 10:00 ac EPA 200.7 07/09/2026 20:26 ac Sodium 13 1 mg/L 1 07/09/2026 10:00 ac EPA 200.7 07/09/2026 20:26 ac Total Cations 3.3 meq/L 07/09/2026 10:00 ac Cale. 07/09/2026 20:26 ac Boron ND 0.1 mg/L 1 U 07/09/2026 10:00 ac EPA 200.7 07/09/2026 20:26 ac Copper ND 10 ug/L 1000, 1 U 07/09/2026 10:00 ac EPA 200.7 07/09/2026 20:26 ac Iron ND 30 ug/L 3001 1 U 07/09/2026 10:00 ac EPA 200.7 07/09/2026 20:26 ac Manganese ND 10 ug/L 501 1 U 07/09/2026 10:00 ac EPA 200.7 07/09/2026 20:26 ac Zinc 1280 20 ug/L 5000 1 07/09/2026 10:00 ac EPA 200.7 07/09/2026 20:26 ac SAR 0.5 07/09/2026 10:00 ac Cale. 07/09/2026 20:26 ac Total Alkalinity(as CaCO3) 160 10 mg/L 1 07/13/2026 16:01 amm SM 4500-H+B 07/14/2026 02:46 amen Hydroxide as OH ND 10 mg/L 1 U 07/13/2026 16:01 amen SM 4500-H+B 07/14/2026 02:46 amm Carbonate as CO3 ND 10 mg/L 1 U 07/13/2026 16:01 amm SM 4500-H+B 07/14/2026 02:46 amm Bicarbonate as HCO3 200 10 mg/L 1 07/13/2026 16:01 amm SM 4500-H+B 07/14/2026 02:46 amm Sulfate 10.3 0.5 mg/L 5001 1 b 07/13/2026 09:55 Win EPA 300.0 07/13/2026 18:38 ldm Chloride 6 1 mg/L 500' 1 b 07/13/2026 09:55 ldm EPA 300.0 07/13/2026 18:38 ldm Nitrate as NO3 7.6 0.4 mg/L 45 1 07/08/2026 15:50 mml SM 4500-NO3 F 07/08/2026 18:06 mml Nitrite as N ND 0.2 mg/L 1 1 U 07/08/2026 15:50 mml SM 4500-NO3 F 07/08/2026 18:04 mini Nitrate+Nitrite as N 1.7 0.4 mg/L 10 1 07/08/2026 15:50 mml SM 4500-NO3 F 07/08/2026 18:06 mml Fluoride ND 0.1 mg/L 2 1 U 07/13/2026 09:55 ldm EPA 300.0 07/13/2026 18:38 ]dm Total Anions 3.8 meq/L 07/13/2026 09:55 ldm Cale. 07/13/2026 18:38 ldm pH 7.2 --- units 1 07/07/2026 09:46 st SM 4500-H+B 07/07/2026 09:46 st Specific Conductance 353 1 umhos/cm 16001 1 07/13/2026 16:01 amm SM 4500-H+B 07/14/2026 02:46 amm Total Dissolved Solids 260 20 mg/L 1000, 1 07/09/2026 15:00 ctl SM 2540 C 07/10/2026 10:30 ctl MBAs(Screen) Negative 0.1 mg/L 1 U 07/08/2026 20:55 met SM 5540 C 07/08/2026 21:14 met Aggressiveness Index 11.2 10 --- 07/09/2026 10:00 ac Cale. 07/09/2026 20:26 ac Langelier Index(20°C) -0.6 20 --- 07/09/2026 10:00 ac Cale. 07/09/2026 20:26 ac Nitrate Nitrogen 1.7 0.4 mg/L 10 1 07/08/2026 15:50 mml SM 4500-NO3 F 07/08/2026 18:06 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