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ENVIRONMENTA AGRICULTURAL Analytical Chemists October 30, 2025 Lab No. : STK2556097-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : October 16, 2025 at 10:20 1868 East Hazelton Ave. Sampled By : Rena LeRoy Stockton, CA 95205 Received On : October 16, 2025 at 12:10 Description :Wellhead Matrix : Drinking Water Project :17250 Campbell Ave., Escalon, CA 95320 Sample Results - Inorganic OFT== ., , General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 107 2.5 mg/L 10/17/2025 13:20 ac 2340B 10/17/2025 21:05 ac Calcium 23 1 mg/L 1 10/17/2025 13:20 ac EPA 200.7 10/17/2025 21:05 ac Magnesium 12 1 mg/L 1 10/17/2025 13:20 ac EPA 200.7 10/17/2025 21:05 ac Potassium 3 1 mg/L 1 10/17/2025 13:20 ac EPA 200.7 10/17/2025 21:05 ac Sodium 18 1 mg/L 1 10/17/2025 13:20 ac EPA 200.7 10/17/2025 21:05 ac Total Cations 3.0 1 meq/L 10/17/2025 13:20 ac Calc. 10/17/2025 21:05 ac Boron ND 0.1 mg/L 1 U 10/17/2025 13:20 ac EPA 200.7 10/17/2025 21:05 ac Copper ND 10 ug/L 1000, 1 U 10/17/2025 13:20 ac EPA 200.7 10/17/2025 21:05 ac Iron ND 30 ug/L 3001 1 U 10/17/2025 13:20 ac EPA 200.7 10/17/2025 21:05 ac Manganese ND 10 ug/L 502 1 U 10/17/2025 13:20 ac EPA 200.7 10/17/2025 21:05 ac Zinc 4820 20 ug/L 5000 1 10/17/2025 13:20 ac EPA 200.7 10/17/2025 21:05 ac SAR 0.8 - 10/17/2025 13:20 ac Calc. 10/17/2025 21:05 ac Total Alkalinity(as CaCO3) 140 10 mg/L 1 10/21/2025 16:40 amm SM 4500-H+B 10/22/2025 07:45 amm Hydroxide as OH ND 10 mg/L 1 U 10/21/2025 16:40 amm SM 4500-H+B 10/22/2025 07:45 amm Carbonate as CO3 ND 10 mg/L 1 U 10/21/2025 16:40 amm SM 4500-H+B 10/22/2025 07:45 amm Bicarbonate as HCO3 170 10 mg/L 1 10/21/2025 16:40 amm SM 4500-H+B 10/22/2025 07:45 amm Sulfate 6.1 0.5 mg/L 5001 1 10/23/2025 11:10 Idm EPA 300.0 10/23/2025 16:26 Idm Chloride 4 1 mg/L 500, 1 10/23/2025 11:10 Idm EPA 300.0 10/23/2025 16:26 Idm Nitrate as NO3 9.6 0.4 mg/L 45 1 10/17/2025 11:30 mml SM 4500-NO3 F 10/17/2025 12:43 mml Nitrite as N ND 0.2 mg/L 1 1 U 10/17/2025 11:30 mml SM 4500-NO3 F 10/17/2025 12:42 mml Nitrate+Nitrite as N 2.2 0.4 mg/L 10 1 10/17/2025 11:30 mml SM 4500-NO3 F 10/17/2025 12:43 mml Fluoride 0.3 0.1 mg/L 2 1 b 10/23/2025 11:10 ldm EPA 300.0 10/23/2025 16:26 Idm Total Anions 3.2 10 meq/L 10/23/2025 11:10 Idm Calc. 10/23/2025 16:26 ldm pH 7.6 --- units 1 10/16/2025 10:20 rl SM 4500-H+B 10/16/2025 10:20 rl Specific Conductance 300 1 umhos/cm 1600, 1 10/21/2025 16:40 amm SM 4500-H+B 10/22/2025 07:45 amm Total Dissolved Solids 240 20 mg/L 10002 1 10/20/2025 11:00 ctl SM 2540 C 10/21/2025 11:15 cd MBAs(Screen) Negative 0.1 mg/L 1 U 10/17/2025 18:11 mct SM 5540 C 10/17/2025 18:22 mct Aggressiveness Index 11.5 10 --- 10/17/2025 13:20 ac Calc. 10/17/2025 21:05 ac Langelier Index(20°C) -0.3 20 --- 10/17/2025 13:20 ac Calc. 10/17/2025 21:05 ac Nitrate Nitrogen 2.2 0.4 mg/L 10 1 10/17/2025 11:30 mml SM 4500-NO3 F 10/17/2025 12:43 mml DQF Flags Definition: U Constituent results were non-detect. b The Blank was positive for constituent but less than the PQL 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