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ENVIRONMENTAL AGRICULTURAL Analytical Chemists March 17, 2026 Lab No. : STK2632853-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : March 2, 2026 at 08:15 1868 East Hazelton Ave. Sampled By : Sastina Thammavongsa Stockton, CA 95205 Received On : March 2, 2026 at 08:45 Description :Well Head Matrix : Drinking Water Project :2151 E Ralph Ave Stockton/WP0044928 Sample Results - Inorganic ®®®®® Sample Analysis General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 68.7 2.5 mg/L 03/03/2026 13:00 ac 2340B 03/03/2026 16:19 ac Calcium 16 1 mg/L 1 03/03/2026 13:00 ac EPA 200.7 03/03/2026 16:19 ac Magnesium 7 1 mg/L 1 03/03/2026 13:00 ac EPA 200.7 03/03/2026 16:19 ac Potassium 2 1 mg/L 1 03/03/2026 13:00 ac EPA 200.7 03/03/2026 16:19 ac Sodium 30 1 mg/L 1 03/03/2026 13:00 ac EPA 200.7 03/03/2026 16:19 ac Total Cations 2.7 - meq/L 03/03/2026 13:00 ac Cale. 03/03/2026 16:19 ac Boron ND 0.1 mg/L 1 U 03/03/2026 13:00 ac EPA 200.7 03/03/2026 16:19 ac Copper ND 10 ug/L 10002 1 U 03/03/2026 13:00 ac EPA 200.7 03/03/2026 16:19 ac Iron 50 30 ug/L 300' 1 03/03/2026 13:00 ac EPA 200.7 03/03/2026 16:19 ac Manganese 140 10 ug/L 502 1 03/03/2026 13:00 ac EPA 200.7 03/03/2026 16:19 ac Zinc ND 20 ug/L 5000 1 U 03/03/2026 13:00 ac EPA 200.7 03/03/2026 16:19 ac SAR 1.6 - 03/03/2026 13:00 ac Cale. 03/03/2026 16:19 ac Total Alkalinity(as CaCO3) 110 10 mg/L 1 03/09/2026 12:55 amm SM 4500-H+B 03/09/2026 23:41 amm Hydroxide as OH ND 10 mg/L 1 U 03/09/2026 12:55 amm SM 4500-H+B 03/09/2026 23:41 amm Carbonate as CO3 ND 10 mg/L 1 U 03/09/2026 12:55 amm SM 4500-H+B 03/09/2026 23:41 amm Bicarbonate as HCO3 130 10 mg/L 1 03/09/2026 12:55 amm SM 4500-H+B 03/09/2026 23:41 amm Sulfate 6.6 0.5 mg/L 500' 1 b 03/16/2026 09:50 Idm EPA 300.0 03/16/2026 21:16 Idm Chloride 24 1 mg/L 5002 1 lb 03/16/2026 09:50 ldm EPA 300.0 03/16/2026 21:16 ldm Nitrate as NO3 0.9 0.4 mg/L 45 1 J 03/03/2026 11:55 mml SM 4500-NO3 F 03/03/2026 13:46 mml Nitrite as N ND 0.2 mg/L 1 1 U 03/03/2026 11:55 mml SM 4500-NO3 F 03/03/2026 13:44 mml Nitrate+Nitrite as N ND 0.4 mg/L 10 1 J 03/03/2026 11:55 mml SM 4500-NO3 F 03/03/2026 13:46 mml Fluoride ND 0.1 mg/L 2 1 U 03/16/2026 09:50 ldm EPA 300.0 03/16/2026 21:16 Idm Total Anions 3.0 - meq/L 03/16/2026 09:50 ldm Cale. 03/16/2026 21:16 Idm pH 7.6 --- units 1 03/02/2026 08:15 st SM 4500-H+B 03/02/2026 08:15 st Specific Conductance 283 1 umhos/cm 16001 1 03/09/2026 12:55 amm SM 4500-H+B 03/09/2026 23:41 amm Total Dissolved Solids 200 20 mg/L 1000, 1 I 03/04/2026 10:30 cd SM 2540 C 03/05/2026 10:30 ctl MBAs(Screen) Negative 0.1 mg/L 1 U 03/03/2026 18:02 met SM 5540 C 03/03/2026 18:09 met Aggressiveness Index 11.2 10 --- 03/03/2026 13:00 ac Cale. 03/03/2026 16:19 ac Langelier Index(20°C) -0.6 20 --- 03/03/2026 13:00 ac Cale. 03/03/2026 16:19 ac Nitrate Nitrogen ND 0.4 mg/L 10 1 U 03/03/2026 11:55 mml SM 4500-NO3 F 03/03/2026 13:46 mml DQF Flags Definition: U Constituent results were non-detect. b The Blank was positive for constituent but less than the PQL 1 The MS/MSD did not meet QC criteria. J Reported value is estimated;detected at a concentration below the RL and above the laboratory MDL. I The RPD for the laboratory duplicate exceeded laboratory criteria. 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.Undo 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