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ENVIRONMENTAL Analytical Chemists November 12, 2025 Lab No. : STK2556501-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : October 28, 2025 at 09:08 1868 East Hazelton Ave. Sampled By : Sastina Thammavongsa Stockton, CA 95205 Received On : October 28, 2025 at 09:29 Description Wellhead Matrix : Drinking Water Project 266 Hewitt Road, Linden Sample Results - Inorganic General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 86.1 2.5 mg/L 10/30/2025 11:00 ac 2340B 10/30/2025 19:39 ac Calcium 18 1 mg/L 1 10/30/2025 11:00 ac EPA 200.7 10/30/2025 19:39 ac Magnesium 10 1 mg/L 1 1 10/30/2025 11:00 ac EPA 200.7 10/30/2025 19:39 ac Potassium 4 1 mg/L 1 10/30/2025 11:00 ac EPA 200.7 10/30/2025 19:39 ac Sodium 13 1 mg/L 1 10/30/2025 11:00 ac EPA 200.7 10/30/2025 19:39 ac Total Cations 2.4 1 meq/L 10/30/2025 11:00 ac Calc. 10/30/2025 19:39 ac Boron ND 0.1 mg/L 1 U 10/30/2025 11:00 ac EPA 200.7 10/30/2025 19:39 ac Copper ND 10 ug/L 10002 1 U 10/30/2025 11:00 ac EPA 200.7 10/30/2025 19:39 ac Iron 270 30 ug/L 3002 1 10/30/2025 11:00 ac EPA 200.7 10/30/2025 19:39 ac Manganese 130 10 ug/L 502 1 10/30/2025 11:00 ac EPA 200.7 10/30/2025 19:39 ac Zinc ND 20 ug/L 5000 1 U 10/30/2025 11:00 ac EPA 200.7 10/30/2025 19:39 ac SAR 0.6 10/30/2025 11:00 ac Calc. 10/30/2025 19:39 ac Total Alkalinity(as CaCO3) 100 10 mg/L 1 11/03/2025 12:35 amm SM 4500-H+B 11/03/2025 15:10 amm Hydroxide as OH ND 10 mg/L 1 U 11/03/2025 12:35 amm SM 4500-H+B 11/03/2025 15:10 amm Carbonate as CO3 ND 10 mg/L 1 U 11/03/2025 12:35 amm SM 4500-H+B 11/03/2025 15:10 amm Bicarbonate as HCO3 120 10 mg/L 1 11/03/2025 12:35 amm SM 4500-H+B 11/03/2025 15:10 amm Sulfate 8.0 0.5 mg/L 5002 1 b 11/03/2025 10:32 ldm EPA 300.0 11/03/2025 18:32 ldm Chloride 6 1 mg/L 5002 1 b 11/03/2025 10:32 ldm EPA 300.0 11/03/2025 18:32 ldm Nitrate as NO3 4.4 0.4 mg/L 45 1 10/29/2025 12:20 mml SM 4500-1403 F 10/29/2025 14:26 mml Nitrite as N ND 0.2 mg/L 1 1 U 10/29/2025 12:20 mml SM 4500-NO3 F 10/29/2025 14:25 mml Nitrate+Nitrite as N 1.0 0.4 mg/L 10 1 10/29/2025 12:20 mml SM 4500-NO3 F 10/29/2025 14:26 mml Fluoride 0.1 0.1 mg/L 2 1 11/03/2025 10:32 ldm EPA 300.0 11/03/2025 18:32 Idm Total Anions 2.4 10 meq/L 11/03/2025 10:32 ldm Calc. 11/03/2025 18:32 Idm pH 7.3 --- units 1 10/28/2025 09:08 st SM 4500-H+B 10/28/2025 09:08 st Specific Conductance 235 1 umhos/cm 16002 1 11/03/2025 12:35 amm SM 4500-H+B 11/03/2025 15:10 amm Total Dissolved Solids 190 20 mg/L 10002 1 10/30/2025 11:00 ct1 SM 2540 C 10/31/2025 11:15 ctl MBAs(Screen) Negative 0.1 mg/L 1 U 10/29/2025 19:32 met SM 5540 C 10/29/2025 19:45 met Aggressiveness Index 11.0 10 --- 10/30/2025 11:00 ac Calc. 10/30/2025 19:39 ac Langelier Index(20°C) -0.9 20 --- 10/30/2025 11:00 ac Calc. 10/30/2025 19:39 ac Nitrate Nitrogen 1.0 0.4 mg/L 10 1 10/29/2025 12:20 mml SM 4500-NO3 F 10/29/2025 14:26 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,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.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