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.O `AGRICULTURAL Analytical Chemists May 8, 2026 Lab No. : STK2636042-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : April 29, 2026 at 08:34 1868 East Hazelton Ave. Sampled By : Sastina Thammavongsa Stockton, CA 95205 Received On : April 29, 2026 at 09:55 Description :Well Head Matrix : Drinking Water Project :7904 S. Endow Road French Camp- WP2601585 Sample Results - Inorganic ��®�� General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 430 2.5 mg/L 05/01/2026 08:00 ac 2340B 05/04/2026 11:41 ac Calcium 118 1 mg/L 1 05/01/2026 08:00 ac EPA 200.7 05/04/2026 11:41 ac Magnesium 33 1 mg/L 1 05/01/2026 08:00 ac EPA 200.7 05/04/2026 11:41 ac Potassium 5 1 mg/L 1 05/01/2026 08:00 ac EPA 200.7 05/01/2026 19:11 ac Sodium 184 1 mg/L 1 05/01/2026 08:00 ac EPA 200.7 05/01/2026 19:11 ac Total Cations 16.7 meq/L 05/01/2026 08:00 ac Calc. 05/04/2026 11:41 ac Boron 0.3 0.1 mg/L 1 05/01/2026 08:00 ac EPA 200.7 05/04/2026 11:41 ac Copper ND 10 ug/L 10002 1 U 05/01/2026 08:00 ac EPA 200.7 05/01/2026 19:11 ac Iron 140 30 ug/L 300' 1 05/01/2026 08:00 ac EPA 200.7 05/01/2026 19:11 ac Manganese 790 10 ug/L 502 1 05/01/2026 08:00 ac EPA 200.7 05/04/2026 11:41 ac Zinc ND 20 ug/L 5000 1 U 05/01/2026 08:00 ac EPA 200.7 05/01/2026 19:11 ac SAR 3.9 05/01/2026 08:00 ac Calc. 05/04/2026 11:41 ac Total Alkalinity(as CaCO3) 170 10 mg/L 1 05/04/2026 18:54 amm SM 4500-H+B 05/05/2026 05:37 amm Hydroxide as OH ND 10 mg/L 1 U 05/04/2026 18:54 amm SM 4500-H+B 05/05/2026 05:37 amm Carbonate as CO3 ND 10 mg/L 1 U 05/04/2026 18:54 amm SM 4500-H+B 05/05/2026 05:37 amm Bicarbonate as HCO3 200 10 mg/L 1 05/04/2026 18:54 amm SM 4500-H+B 05/05/2026 05:37 amm Sulfate 5.6 0.5 mg/L 5001 1 b 05/06/2026 08:51 ldm EPA 300.0 05/06/2026 14:24 ldm Chloride 520 11* mg/L 500' 10 b 05/06/2026 08:51 ldm EPA 300.0 05/07/2026 12:35 ldm Nitrate as NO3 0.7 0.4 mg/L 45 1 J 04/30/2026 13:40 mml SM 4500-NO3 F 04/30/2026 15:16 mml Nitrite as N ND 0.2 mg/L 1 1 U 04/30/2026 13:40 mml SM 4500-NO3 F 04/30/2026 15:14 mml Nitrate+Nitrite as N ND 0.4 mg/L 10 1 J 04/30/2026 13:40 mml SM 4500-NO3 F 04/30/2026 15:16 mml Fluoride ND 0.1 mg/L 2 1 U 05/06/2026 08:51 ldm EPA 300.0 05/06/2026 14:24 ldm Total Anions 18.1 meq/L 05/06/2026 08:51 Win Calc. 05/07/2026 12:35 ldm pH 7.1 --- units 1 04/29/2026 08:34 st SM 4500-H+B 04/29/2026 08:34 st Specific Conductance 2000 1 umhos/cm 16002 1 05/04/2026 18:54 amm SM 4500-H+B 05/05/2026 05:37 amm Total Dissolved Solids 1430 10 mg/L 10002 1 05/01/2026 10:00 ctl SM 2540 C 05/04/2026 12:00 ctl MBAS(Screen) Negative 0.1 mg/L 1 U 04/30/2026 15:58 mct SM 5540 C 04/30/2026 16:03 mct Aggressiveness Index 11.8 10 --- 05/01/2026 08:00 ac Calc. 05/04/2026 11:41 ac Langelier Index(20°C) -0.1 10 --- 05/01/2026 08:00 ac Calc. 05/04/2026 11:41 ac Nitrate Nitrogen ND 0.4 mg/L 10 1 U 04/30/2026 13:40 mml SM 4500-NO3 F 04/30/2026 15:16 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, 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