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ENV I.O Analytical Chemists January 29, 2026 Lab No. : STK2630707-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On :January 15, 2026 at 08:26 1868 East Hazelton Ave. Sampled By : Sastina Thammavongsa Stockton, CA 95205 Received On :January 15, 2026 at 10:10 Description :Well Head Matrix : Drinking Water Project :10499 S. Manthey Rd Lathrop/ WP2501377 Sample Results - Inorganic Sample Anaiv-sis---- General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 110 2.5 mg/L 01/19/2026 13:00 ac 2340B 01/19/2026 15:26 ac Calcium 31 1 mg/L 1 01/19/2026 13:00 ac EPA 200.7 01/19/2026 15:26 ac Magnesium 8 1 mg/L 1 01/19/2026 13:00 ac EPA 200.7 01/19/2026 15:26 ac Potassium 3 1 mg/L 1 01/19/2026 13:00 ac EPA 200.7 01/19/2026 15:26 ac Sodium 62 1 mg/L 1 01/19/2026 13:00 ac EPA 200.7 01/19/2026 15:26 ac Total Cations 5.0 - meq/L 01/19/2026 13:00 ac Calc. 01/19/2026 15:26 ac Boron 0.2 0.1 mg/L 1 01/19/2026 13:00 ac EPA 200.7 01/19/2026 15:26 ac Copper ND 10 ug/L 1000, 1 U 01/19/2026 13:00 ac EPA 200.7 01/19/2026 15:26 ac Iron ND 30 ug/L 3002 1 U 01/19/2026 13:00 ac EPA 200.7 01/19/2026 15:26 ac Manganese 10 10 ug/L 502 1 01/19/2026 13:00 ac EPA 200.7 01/19/2026 15:26 ac Zinc ND 20 ug/L 5000 1 U 01/19/2026 13:00 ac EPA 200.7 01/19/2026 15:26 ac SAR 2.6 01/19/2026 13:00 ac Calc. 01/19/2026 15:26 ac Total Alkalinity(as CaCO3) 170 10 mg/L 1 01/19/2026 13:05 amm SM 4500-H+B 01/19/2026 16:45 amm Hydroxide as OH ND 10 mg/L 1 U 01/19/2026 13:05 amm SM 4500-H+B 01/19/2026 16:45 amm Carbonate as CO3 ND 10 mg/L 1 U 01/19/2026 13:05 amm SM 4500-H+B 01/19/2026 16:45 amm Bicarbonate as HCO3 210 10 mg/L 1 01/19/2026 13:05 amm SM 4500-H+B 01/19/2026 16:45 amm Sulfate 15.4 0.5 mg/L 5002 1 b 01/22/2026 10:17 ldm EPA 300.0 01/22/2026 22:57 ldm Chloride 46 1 mg/L 5002 1 b 01/22/2026 10:17 ldm EPA 300.0 01/22/2026 22:57 ldm Nitrate as NO3 16.6 0.4 mg/L 45 1 01/16/2026 12:10 mml SM 4500-NO3 F 01/16/2026 13:42 mml Nitrite as N ND 0.2 mg/L 1 1 U 01/16/2026 12:10 mml SM 4500-NO3 F 01/16/2026 13:40 mml Nitrate+Nitrite as N 3.7 0.4 mg/L 10 1 01/16/2026 12:10 mml SM 4500-NO3 F 01/16/2026 13:42 mml Fluoride 0.1 0.1 mg/L 2 1 01/22/2026 10:17 ldm EPA 300.0 01/22/2026 22:57 ldm Total Anions 5.3 -- meq/L 01/22/2026 10:17 ldm Calc. 01/22/2026 22:57 ldm pH 7.6 --- units 1 01/15/2026 08:26 st SM 4500-H+B 01/15/2026 08:26 st Specific Conductance 527 1 umhos/cm 16002 1 01/19/2026 13:05 amm SM 4500-H+B 01/19/2026 16:45 amm Total Dissolved Solids 330 20 mg/L 10002 1 I 01/19/2026 10:45 ctl SM 2540 C 01/20/2026 11:00 ctl MBAS(Screen) Negative 0.1 mg/L 1 U 01/16/2026 16:52 mct SM 5540 C 01/16/2026 16:56 mct Aggressiveness Index 11.7 10 --- 01/19/2026 13:00 ac Calc. 01/19/2026 15:26 ac Langelier Index(20°C) -0.1 20 --- 01/19/2026 13:00 ac Calc. 01/19/2026 15:26 ac Nitrate Nitrogen 3.7 0.4 mg/L 10 1 01/16/2026 12:10 mml SM 4500-NO3 F 01/16/2026 13:42 mml DQF Flags Definition: U Constituent results were non-detect. b The Blank was positive for constituent but less than the PQL I The RPD for the laboratory duplicate exceeded laboratory criteria. ND=Non-Detected, RL=Reporting Level,Dil.=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