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ENVIRONMENTALFGL Analytical Chemists June 9, 2026 Lab No. : STK2637775-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : May 28, 2026 at 08:28 1868 East Hazelton Ave. Sampled By : Sastina Thammavongsa Stockton, CA 95205 Received On : May 28, 2026 at 09:31 Description :Wellhead Matrix : Drinking Water Project :12425 E Comstock Rd Stk-WP2601441 Sample Results - Inorganic General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 178 2.5 mg/L 05/30/2026 07:00 ac 2340B 05/30/2026 14:16 ac Calcium 35 1 mg/L 1 05/30/2026 07:00 ac EPA 200.7 05/30/2026 14:16 ac Magnesium 22 1 mg/L 1 05/30/2026 07:00 ac EPA 200.7 05/30/2026 14:16 ac Potassium 4 1 mg/L 1 05/30/2026 07:00 ac EPA 200.7 05/30/2026 14:16 ac Sodium 16 1 mg/L 1 05/30/2026 07:00 ac EPA 200.7 05/30/2026 14:16 ac Total Cations 4.4 - meq/L 05/30/2026 07:00 ac Calc. 05/30/2026 14:16 ac Boron ND 0.1 mg/L 1 U 05/30/2026 07:00 ac EPA 200.7 05/30/2026 14:16 ac Copper ND 10 ug/L 1000, 1 U 05/30/2026 07:00 ac EPA 200.7 05/30/2026 14:16 ac Iron 40 30 ug/L 3002 1 05/30/2026 07:00 ac EPA 200.7 05/30/2026 14:16 ac Manganese 20 10 ug/L 50' 1 05/30/2026 07:00 ac EPA 200.7 05/30/2026 14:16 ac Zinc 280 20 ug/L 5000 1 05/30/2026 07:00 ac EPA 200.7 05/30/2026 14:16 ac SAR 0.5 05/30/2026 07:00 ac Calc. 05/30/2026 14:16 ac Total Alkalinity(as CaCO3) 170 10 mg/L 1 06/03/2026 13:47 amm SM 4500-H+B 06/03/2026 15:53 amm Hydroxide as OH ND 10 mg/L 1 U 06/03/2026 13:47 amm SM 4500-H+B 06/03/2026 15:53 amm Carbonate as CO3 ND 10 mg/L 1 U 06/03/2026 13:47 amm SM 4500-H+B 06/03/2026 15:53 amm Bicarbonate as HCO3 210 10 mg/L 1 06/03/2026 13:47 amm SM 4500-H+B 06/03/2026 15:53 amm Sulfate 18.4 0.5 mg/L 500' 1 06/04/2026 10:25 ldm EPA 300.0 06/04/2026 20:19 ldm Chloride 12 1 mg/L 5001 1 06/04/2026 10:25 ldm EPA 300.0 06/04/2026 20:19 ldm Nitrate as NO3 12.1 0.4 mg/L 45 1 05/29/2026 12:00 mml SM 4500-NO3 F 05/29/2026 13:03 mml Nitrite as N ND 0.2 mg/L 1 1 U 05/29/2026 12:00 mml SM 4500-NO3 F 05/29/2026 13:01 mml Nitrate+Nitrite as N 2.7 0.4 mg/L 10 1 05/29/2026 12:00 mml SM 4500-NO3 F 05/29/2026 13:03 mml Fluoride ND 0.1 mg/L 2 1 U 06/04/2026 10:25 ldm EPA 300.0 06/04/2026 20:19 ldm Total Anions 4.4 meq/L 06/04/2026 10:25 Idm Calc. 06/04/2026 20:19 ldm pH 7.2 - units 1 05/28/2026 08:28 st SM 4500-H+B 05/28/2026 08:28 st Specific Conductance 414 1 umhos/cm 16001 1 06/03/2026 13:47 amm SM 4500-H+B 06/03/2026 15:53 amm Total Dissolved Solids 280 20 mg/L 1000' 1 06/02/2026 10:45 ctl SM 2540 C 06/03/2026 11:30 ctl MBAs(Screen) Negative 0.1 mg/L 1 U 05/29/2026 19:42 mct SM 5540 C 05/29/2026 19:50 mct Aggressiveness Index 11.4 10 --- 05/30/2026 07:00 ac Calc. 05/30/2026 14:16 ac Langelier Index(20°C) -0.5 20 --- 05/30/2026 07:00 ac Calc. 05/30/2026 14:16 ac Nitrate Nitrogen 2.7 0.4 mg/L 10 1 05/29/2026 12:00 mml SM 4500-NO3 F 05/29/2026 13:03 mml DQF Flags Definition: U Constituent results were non-detect. 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.2610