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ENVIRONMENTAL . , Analytical Chernists July 24, 2026 Lab No. : STK2650110-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On :July 8, 2026 at 08:40 1868 East Hazelton Ave. Sampled By : Rena LeRoy Stockton, CA 95205 Received On :July 8, 2026 at 09:50 Description :Wellhead Matrix : Drinking Water Project :31399 E. Combs Ave, Escalon- AP2400863 Sample Results - Inorganic General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 175 2.5 mg/L 07/13/2026 13:30 ac 2340B 07/13/2026 16:33 ac Calcium 37 1 mg/L 1 07/13/2026 13:30 ac EPA 200.7 07/13/2026 16:33 ac Magnesium 20 1 mg/L 1 07/13/2026 13:30 ac EPA 200.7 07/13/2026 16:33 ac Potassium 4 1 mg/L 1 07/13/2026 13:30 ac EPA 200.7 07/13/2026 16:33 ac Sodium 19 1 mg/L 1 07/13/2026 13:30 ac EPA 200.7 07/13/2026 16:33 ac Total Cations 4.4 -- meq/L 07/13/2026 13:30 ac Calc. 07/13/2026 16:33 ac Boron ND 0.1 mg/L 1 U 07/13/2026 13:30 ac EPA 200.7 07/13/2026 16:33 ac Copper ND 10 ug/L 1000, 1 U 07/13/2026 13:30 ac EPA 200.7 07/13/2026 16:33 ac Iron ND 30 ug/L 300' 1 U 07/13/2026 13:30 ac EPA 200.7 07/13/2026 16:33 ac Manganese ND 10 ug/L 50' 1 U 07/13/2026 13:30 ac EPA 200.7 07/13/2026 16:33 ac Zinc ND 20 ug/L 5000 1 U 07/13/2026 13:30 ac EPA 200.7 07/13/2026 16:33 ac SAR 0.6 07/13/2026 13:30 ac Calc. 07/13/2026 16:33 ac Total Alkalinity(as CaCO3) 190 10 mg/L 1 07/21/2026 10:16 amm SM 4500-H+B 07/21/2026 17:37 amm Hydroxide as OH ND 10 mg/L 1 U 07/21/2026 10:16 amm SM 4500-H+B 07/21/2026 17:37 amm Carbonate as CO3 ND 10 mg/L 1 U 07/21/2026 10:16 amm SM 4500-H+B 07/21/2026 17:37 amm Bicarbonate as HCO3 240 10 mg/L 1 07/21/2026 10:16 amm SM 4500-H+B 07/21/2026 17:37 amm Sulfate 11.2 0.5 mg/L 500' 1 07/17/2026 08:18 ldm EPA 300.0 07/17/2026 13:06 ldm Chloride 15 1 mg/L 500' 1 07/17/2026 08:18 ldm EPA 300.0 07/17/2026 13:06 ldm Nitrate as NO3 24.0 0.4 mg/L 45 1 07/09/2026 11:10 mml SM 4500-NO3 F 07/09/2026 11:44 mml Nitrite as N ND 0.2 mg/L 1 1 U 07/09/2026 11:10 mml SM 4500-NO3 F 07/09/2026 11:42 mml Nitrate+Nitrite as N 5.4 0.4 mg/L 10 1 07/09/2026 11:10 mml SM 4500-NO3 F 07/09/2026 11:44 mml Fluoride 0.1 0.1 mg/L 2 1 07/17/2026 08:18 ldm EPA 300.0 07/17/2026 13:06 ldm Total Anions 5.0 -- meq/L 07/17/2026 08:18 ldm Calc. 07/17/2026 13:06 ldm pH 7.2 --- units 1 07/08/2026 08:40 rl SM 4500-H+B 07/08/2026 08:40 rl Specific Conductance 468 1 umhos/cm 1600' 1 07/21/2026 10:16 amm SM 4500-H+B 07/21/2026 17:37 amm Total Dissolved Solids 340 20 mg/L 1000' 1 07/13/2026 10:55 ctl SM 2540 C 07/14/2026 10:45 cd MBAs(Screen) Negative 0.1 mg/L 1 U 07/09/2026 20:24 mct SM 5540 C 07/09/2026 20:31 mct Aggressiveness Index 11.4 10 -- 07/13/2026 13:30 ac Calc. 07/13/2026 16:33 ac Langelier Index(20°C) -0.4 20 -- 07/13/2026 13:30 ac Calc. 07/13/2026 16:33 ac Nitrate Nitrogen 5.4 0.4 mg/L 10 1 07/09/2026 11:10 mml SM 4500-NO3 F 07/09/2026 11:44 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.2810