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.O `AGRICULTURAL Analytical Chemists July 16, 2024 Lab No. : STK2439765-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On :July 2, 2024 at 14:00 1868 East Hazelton Ave. Sampled By : Aaron Gooderham Stockton, CA 95205 Received On :July 2, 2024 at 14:20 Description Wellhead Matrix : Drinking Water Project 21601 E.Copperopolis-WP0043266 Sample Results - Inorganic 91 _ • . General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 74.5 2.5 mg/L 07/08/2024 08:00 ac 2340B 07/08/2024 16:55 ac Calcium 15 1 mg/L 1 07/08/2024 08:00 ac EPA 200.7 07/08/2024 16:55 ac Magnesium 9 1 mg/L 1 07/08/2024 08:00 ac EPA 200.7 07/08/2024 16:55 ac Potassium 4 1 mg/L 1 07/08/2024 08:00 ac EPA 200.7 07/08/2024 16:55 ac Sodium 14 1 mg/L 1 07/08/2024 08:00 ac EPA 200.7 07/08/2024 16:55 ac Total Cations 2.2 1 meq/L 07/08/2024 08:00 ac Calc. 07/08/2024 16:55 ac Boron ND 0.1 mg/L 1 U 07/08/2024 08:00 ac EPA 200.7 07/08/2024 16:55 ac Copper 10 10 ug/L 10002 1 07/08/2024 08:00 ac EPA 200.7 07/08/2024 16:55 ac Iron ND 30 ug/L 3002 1 U 07/08/2024 08:00 ac EPA 200.7 07/08/2024 16:55 ac Manganese ND 10 ug/L 502 1 U 07/08/2024 08:00 ac EPA 200.7 07/08/2024 16:55 ac Zinc 50 20 ug/L 5000 1 07/08/2024 08:00 ac EPA 200.7 07/08/2024 16:55 ac SAR 0.7 07/08/2024 08:00 ac Calc. 07/08/2024 16:55 ac Total Alkalinity(as CaCO3) 90 10 mg/L 1 07/06/2024 13:25 amm SM 4500-H+B 07/06/2024 18:47 amm Hydroxide as OH ND 10 mg/L 1 U 07/06/2024 13:25 amm SM 4500-H+B 07/06/2024 18:47 amm Carbonate as CO3 ND 10 mg/L 1 U 07/06/2024 13:25 amm SM 4500-H+B 07/06/2024 18:47 amm Bicarbonate as HCO3 110 10 mg/L 1 07/06/2024 13:25 amm SM 4500-H+B 07/06/2024 18:47 amm Sulfate 6.7 0.5 mg/L 500' 1 07/03/2024 19:14 ldm EPA 300.0 07/04/2024 14:56 ldm Chloride 8 1 mg/L 500' 1 07/03/2024 19:14 ldm EPA 300.0 07/04/2024 14:56 ldm Nitrate as NO3 9.0 0.4 mg/L 45 1 T 07/03/2024 19:14 ldm EPA 300.0 07/04/2024 14:56 ldm Nitrite as N ND 0.1 mg/L 1 1 UT 07/03/2024 19:14 ldm EPA 300.0 07/04/2024 14:56 ldm Nitrate+Nitrite as N 2.0 0.1 mg/L 10 1 T 07/03/2024 19:14 ldm EPA 300.0 07/04/2024 14:56 ldm Fluoride 0.1 0.1 mg/L 2 1 07/03/2024 19:14 ldm EPA 300.0 07/04/2024 14:56 ldm Total Anions 2.3 10 meq/L 07/03/2024 19:14 ldm Calc. 07/04/2024 14:56 ldm pH 7.40 --- units 1 07/02/2024 14:00 ag SM 4500-H+B 07/02/2024 14:00 ag Specific Conductance 222 1 umhos/cm 1600' 1 07/06/2024 13:25 amm SM 4500-H+B 07/06/2024 18:47 amm Total Dissolved Solids 200 20 mg/L 1000' 1 07/05/2024 10:30 ctl SM 2540 C 07/08/2024 12:40 ctl MBAS,Calc.as LAS,MW 320 Negative 0.1 mg/L 0.52 1 U 07/03/2024 16:35 krh SM 5540 C 07/03/2024 16:43 krh Aggressiveness Index 10.9 10 --- 07/08/2024 08:00 ac Calc. 07/08/2024 16:55 ac Langelier Index(20°C) -0.9 20 --- 07/08/2024 08:00 ac Calc. 07/08/2024 16:55 ac Nitrate Nitrogen 2.0 0.1 mg/L 10 1 T 07/03/2024 19:14 ldm EPA 300.0 07/04/2024 14:56 ldm DQF Flags Definition: U Constituent results were non-detect. T Exceeded method/regulatory-specific holding time. 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 3 of 8 Page 3 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