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ENVIRONMENTAO�, AGRICULTURAL Analytical Chemists December 17, 2025 Lab No. : STK2558283-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : December 2, 2025 at 08:46 1868 East Hazelton Ave. Sampled By : Sastina Thammavongsa Stockton, CA 95205 Received On : December 2, 2025 at 09:29 Description :Well Head Matrix : Drinking Water Project :891 Manila Road ,Lathrop / WP2501139 Sample Results - Inorganic ` ffl�- Sample Analysis General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 513 2.5 mg/L 12/04/2025 09:00 ac 2340B 12/04/2025 12:11 ac Calcium 151 1 mg/L 1 12/04/2025 09:00 ac EPA 200.7 12/04/2025 12:11 ac Magnesium 33 1 mg/L 1 12/04/2025 09:00 ac EPA 200.7 12/04/2025 12:11 ac Potassium 4 1 mg/L 1 12/04/2025 09:00 ac EPA 200.7 12/04/2025 12:11 ac Sodium 424 5* mg/L 5 12/04/2025 09:00 ac EPA 200.7 12/06/2025 22:29 ac Total Cations 28.8 5 meq/L 12/04/2025 09:00 ac Calc. 12/04/2025 12:11 ac Boron 0.5 0.1 mg/L 1 12/04/2025 09:00 ac EPA 200.7 12/04/2025 12:11 ac Copper 10 10 ug/L 1000, 1 12/04/2025 09:00 ac EPA 200.7 12/04/2025 12:11 ac Iron 1160 30 ug/L 3002 1 12/04/2025 09:00 ac EPA 200.7 12/04/2025 12:11 ac Manganese 670 10 ug/L 501 1 12/04/2025 09:00 ac EPA 200.7 12/04/2025 12:11 ac Zinc ND 20 ug/L 5000 1 U 12/04/2025 09:00 ac EPA 200.7 12/04/2025 12:11 ac SAR 8.1 12/04/2025 09:00 ac Calc. 12/04/2025 12:11 ac Total Alkalinity(as CaCO3) 80 10 mg/L 1 12/04/2025 15:41 amm SM 4500-H+B 12/05/2025 02:58 amm Hydroxide as OH ND 10 mg/L 1 U 12/04/2025 15:41 amm SM 4500-H+B 12/05/2025 02:58 amm Carbonate as CO3 ND 10 mg/L 1 U 12/04/2025 15:41 amm SM 4500-H+B 12/05/2025 02:58 amm Bicarbonate as HCO3 100 10 mg/L 1 12/04/2025 15:41 amm SM 4500-H+B 12/05/2025 02:58 amm Sulfate 18.8 0.5 mg/L 5001 1 b 12/11/2025 08:32 ldm EPA 300.0 12/11/2025 12:51 ldm Chloride 1000 20* mg/L 5002 20 b 12/11/2025 08:32 ldm EPA 300.0 12/12/2025 03:06 Win Nitrate as NO3 0.4 0.4 mg/L 45 1 J 12/03/2025 12:35 mml SM 4500-NO3 F 12/03/2025 14:50 mml Nitrite as N ND 0.2 mg/L 1 1 U 12/03/2025 12:35 mml SM 4500-NO3 F 12/03/2025 14:48 mml Nitrate+Nitrite as N ND 0.4 mg/L 10 1 J 12/03/2025 12:35 mml SM 4500-NO3 F 12/03/2025 14:50 mml Fluoride ND 0.1 mg/L 2 1 U 12/11/2025 08:32 !dm EPA 300.0 12/11/2025 12:51 ldm Total Anions 30.2 20 meq/L 12/11/2025 08:32 idm Calc. 12/12/2025 03:06 ldm pH 7.8 --- units 1 12/02/2025 08:46 st SM 4500-H+B 12/02/2025 08:46 st Specific Conductance 3310 1 umhos/cm 1600' 1 12/04/2025 15:41 amm SM 4500-H+B 12/05/2025 02:58 amm Total Dissolved Solids 2350 20 mg/L 1000, 1 12/04/2025 13:15 ctl SM 2540 C 12/05/2025 10:35 cti MBAs(Screen) Negative 0.1 mg/L 1 U 12/03/2025 16:27 mct SM 5540 C 12/03/2025 16:35 mct Aggressiveness Index 12.3 10 - 12/04/2025 09:00 ac Calc. 12/04/2025 12:11 ac Langeher Index(20°C) 0.3 20 -- 12/04/2025 09:00 ac Calc. 12/04/2025 12:11 ac Nitrate Nitrogen ND 0.4 mg/L 10 1 U 12/03/2025 12:35 mml SM 4500-NO3 F 12/03/2025 14:50 mml DQF Flags Definition: U Constituent results were non-detect. b The Blank was positive for constituent but less than the PQL J Reported value is estimated;detected at a concentration below the RL and above the laboratory MDL. ND=Non-Detected, RL=Reporting Level*RL adjusted for dilution, 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