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Analytical Chemists May 8, 2026 Lab No. : STK2635980-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On :April 28, 2026 at 08:15 1868 East Hazelton Ave. Sampled By : Sastina Thammavongsa Stockton, CA 95205 Received On :April 28, 2026 at 08:42 Description Wellhead Matrix : Drinking Water Project 6156 Ashley Lane-WP0043366 Sample Results - Inorganic ®®FEAM U KIM1730MIMMM . General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 122 2.5 mg/L 05/01/2026 08:00 ac 2340B 05/04/2026 12:28 ac Calcium 24 1 mg/L 1 05/01/2026 08:00 ac EPA 200.7 05/04/2026 12:28 ac Magnesium 15 1 mg/L 1 05/01/2026 08:00 ac EPA 200.7 05/04/2026 12:28 ac Potassium 6 1 mg/L 1 05/01/2026 08:00 ac EPA 200.7 05/01/2026 19:49 ac Sodium 13 1 mg/L 1 05/01/2026 08:00 ac EPA 200.7 05/01/2026 19:49 ac Total Cations 3.2 - meq/L 05/01/2026 08:00 ac Calc. 05/04/2026 12:28 ac Boron ND 0.1 mg/L 1 U 05/01/2026 08:00 ac EPA 200.7 05/04/2026 12:28 ac Copper ND 10 ug/L 10002 1 U 05/01/2026 08:00 ac EPA 200.7 05/01/2026 19:49 ac Iron ND 30 ug/L 3001 1 U 05/01/2026 08:00 ac EPA 200.7 05/01/2026 19:49 ac Manganese ND 10 ug/L 50' 1 U 05/01/2026 08:00 ac EPA 200.7 05/04/2026 12:28 ac Zinc ND 20 ug/L 5000 1 U 05/01/2026 08:00 ac EPA 200.7 05/01/2026 19:49 ac SAR 0.5 - 05/01/2026 08:00 ac Calc. 05/04/2026 12:28 ac Total Alkalinity(as CaCO3) 130 10 mg/L 1 05/04/2026 18:54 amm SM 4500-H+B 05/04/2026 23:15 amm Hydroxide as OH ND 10 mg/L 1 U 05/04/2026 18:54 amm SM 4500-H+B 05/04/2026 23:15 amm Carbonate as CO3 ND 10 mg/L 1 U 05/04/2026 18:54 amm SM 4500-H+B 05/04/2026 23:15 amm Bicarbonate as HCO3 150 10 mg/L 1 05/04/2026 18:54 amm SM 4500-H+B 05/04/2026 23:15 amm Sulfate 10.4 0.5 mg/L 500' 1 05/04/2026 12:04 ldm EPA 300.0 05/04/2026 15:39 ldm Chloride 10 1 mg/L 5002 1 05/04/2026 12:04 ldm EPA 300.0 05/04/2026 15:39 ldm Nitrate as NO3 5.2 0.4 mg/L 45 1 04/29/2026 11:45 mml SM 4500-NO3 F 04/29/2026 13:10 mml Nitrite as N ND 0.2 mg/L 1 1 U 04/29/2026 11:45 mml SM 4500-NO3 F 04/29/2026 13:08 mml Nitrate+Nitrite as N 1.2 0.4 mg/L 10 1 04/29/2026 11:45 mmi SM 4500-NO3 F 04/29/2026 13:10 mml Fluoride ND 0.1 mg/L 2 1 U 05/04/2026 12:04 ldm EPA 300.0 05/04/2026 15:39 ldm Total Anions 3.0 -- meq/L 05/04/2026 12:04 ldm Calc. 05/04/2026 15:39 Idm pH 7.0 --- units 1 04/28/2026 08:15 st SM 4500-H+B 04/28/2026 08:15 st Specific Conductance 302 1 umhos/cm 1600' 1 05/04/2026 18:54 amm SM 4500-H+B 05/04/2026 23:15 amm Total Dissolved Solids 230 20 mg/L 1000, 1 04/30/2026 14:00 ct1 SM 2540 C 05/01/2026 10:15 ctl MBAs(Screen) Negative 0.1 mg/L 1 U 04/29/2026 18:23 mct SM 5540 C 04/29/2026 18:33 mct Aggressiveness Index 10.9 10 - 05/01/2026 08:00 ac Calc. 05/04/2026 12:28 ac Langelier Index(20°C) -0.9 20 - 05/01/2026 08:00 ac Calc. 05/04/2026 12:28 ac Nitrate Nitrogen 1.2 0.4 mg/L 10 1 04/29/2026 11:45 mml SM 4500-NO3 F 04/29/2026 13:10 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.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