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.O `AGRICULTURAL Analytical Chemists July 25, 2024 Lab No. : STK2450655-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On :July 18, 2024 at 09:30 1868 East Hazelton Ave. Sampled By : Aaron Gooderham Stockton, CA 95205 Received On :July 18, 2024 at 13:40 Description Wellhead Matrix : Drinking Water Project 6500 Duncan Road-WP0044737 Sample Results - Inorganic 91 _ • . General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 134 2.5 mg/L 07/23/2024 09:00 ac 2340B 07/23/2024 16:31 ac Calcium 34 1 mg/L 1 07/23/2024 09:00 ac EPA 200.7 07/23/2024 16:31 ac Magnesium 12 1 mg/L 1 07/23/2024 09:00 ac EPA 200.7 07/23/2024 16:31 ac Potassium 3 1 mg/L 1 07/23/2024 09:00 ac EPA 200.7 07/23/2024 16:31 ac Sodium 12 1 mg/L 1 07/23/2024 09:00 ac EPA 200.7 07/23/2024 16:31 ac Total Cations 3.3 1 meq/L 07/23/2024 09:00 ac Calc. 07/23/2024 16:31 ac Boron ND 0.1 mg/L 1 U 07/23/2024 09:00 ac EPA 200.7 07/23/2024 16:31 ac Copper ND 10 ug/L 10002 1 U 07/23/2024 09:00 ac EPA 200.7 07/23/2024 16:31 ac Iron ND 30 ug/L 3002 1 U 07/23/2024 09:00 ac EPA 200.7 07/23/2024 16:31 ac Manganese ND 10 ug/L 502 1 U 07/23/2024 09:00 ac EPA 200.7 07/23/2024 16:31 ac Zinc ND 20 ug/L 5000 1 U 07/23/2024 09:00 ac EPA 200.7 07/23/2024 16:31 ac SAR 0.5 07/23/2024 09:00 ac Calc. 07/23/2024 16:31 ac Total Alkalinity(as CaCO3) 140 10 mg/L 1 07/22/2024 15:13 amm SM 4500-H+B 07/22/2024 22:47 amm Hydroxide as OH ND 10 mg/L 1 U 07/22/2024 15:13 amm SM 4500-H+B 07/22/2024 22:47 amm Carbonate as CO3 ND 10 mg/L 1 U 07/22/2024 15:13 amm SM 4500-H+B 07/22/2024 22:47 amm Bicarbonate as HCO3 170 10 mg/L 1 07/22/2024 15:13 amm SM 4500-H+B 07/22/2024 22:47 amm Sulfate 12.1 0.5 mg/L 5002 1 07/19/2024 16:45 ldm EPA 300.0 07/19/2024 20:42 ldm Chloride 7 1 mg/L 5002 1 07/19/2024 16:45 ldm EPA 300.0 07/19/2024 20:42 ldm Nitrate as NO3 6.5 0.4 mg/L 45 1 07/19/2024 16:45 ldm EPA 300.0 07/19/2024 20:42 ldm Nitrite as N ND 0.1 mg/L 1 1 U 07/19/2024 16:45 ldm EPA 300.0 07/19/2024 20:42 ldm Nitrate+Nitrite as N 1.5 0.1 mg/L 10 1 07/19/2024 16:45 ldm EPA 300.0 07/19/2024 20:42 ldm Fluoride ND 0.1 mg/L 2 1 U 07/19/2024 16:45 ldm EPA 300.0 07/19/2024 20:42 ldm Total Anions 3.3 10 meq/L 07/19/2024 16:45 ldm Calc. 07/19/2024 20:42 ldm pH 7.40 --- units 1 07/18/2024 09:30 ag SM 4500-H+B 07/18/2024 09:30 ag Specific Conductance 327 1 umhos/cm 16002 1 07/22/2024 15:13 amm SM 4500-H+B 07/22/2024 22:47 amm Total Dissolved Solids 220 20 mg/L 10002 1 07/22/2024 11:50 ctl SM 2540 C 07/23/2024 11:30 ctl MBAS,Calc.as LAS,MW 320 Negative 0.1 mg/L 0.52 1 U 07/19/2024 14:45 krh SM 5540 C 07/19/2024 15:50 krh Aggressiveness Index 11.5 10 --- 07/23/2024 09:00 ac Calc. 07/23/2024 16:31 ac Langelier Index(20°C) -0.3 20 --- 07/23/2024 09:00 ac Calc. 07/23/2024 16:31 ac Nitrate Nitrogen 1.5 0.1 mg/L 10 1 07/19/2024 16:45 ldm EPA 300.0 07/19/2024 20:42 ldm DQF Flags Definition: U Constituent results were non-detect. 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 7 Page 2 of 7 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