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.O `AGRICULTURAL Analytical Chemists January 4, 2024 Lab No. : STK2357703-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : December 28, 2023 at 09:20 1868 East Hazelton Ave. Sampled By : Naseem Ahmed Stockton, CA 95205 Received On : December 28, 2023 at 10:30 Description :Wellhead Matrix : Drinking Water Project :8014 N. Alpine Rd., Stockton- PO#WP0044496 Sample Results - Inorganic • ,. General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 159 2.5 mg/L 1 01/02/2024 08:00 ac 2340B 01/02/2024 09:31 ac Calcium 34 1 mg/L 1 01/02/2024 08:00 ac EPA 200.7 01/02/2024 09:31 ac Magnesium 18 1 mg/L 1 12/29/2023 12:00 ac EPA 200.7 12/29/2023 13:56 ac Potassium 6 1 mg/L 1 12/29/2023 12:00 ac EPA 200.7 12/29/2023 13:56 ac Sodium 13 1 mg/L 1 12/29/2023 12:00 ac EPA 200.7 12/29/2023 13:56 ac Total Cations 3.9 --- meq/L 1 01/02/2024 08:00 ac Calc. 01/02/2024 09:31 ac Boron ND 0.1 mg/L 1 U 12/29/2023 12:00 ac EPA 200.7 12/29/2023 13:56 ac Copper ND 10 ug/L 10002 1 U 12/29/2023 12:00 ac EPA 200.7 12/29/2023 13:56 ac Iron 40 30 ug/L 3002 1 12/29/2023 12:00 ac EPA 200.7 12/29/2023 13:56 ac Manganese ND 10 ug/L 502 1 U 12/29/2023 12:00 ac EPA 200.7 12/29/2023 13:56 ac Zinc ND 20 ug/L 5000 1 U 12/29/2023 12:00 ac EPA 200.7 12/29/2023 13:56 ac SAR 0.4 0.1 1 01/02/2024 08:00 ac Calc. 01/02/2024 09:31 ac Total Alkalinity(as CaCO3) 150 10 mg/L 1 01/02/2024 19:43 amm SM 4500-H+B 01/02/2024 23:37 amm Hydroxide as OH ND 10 mg/L 1 U 01/02/2024 19:43 amm SM 4500-H+B 01/02/2024 23:37 amm Carbonate as CO3 ND 10 mg/L 1 U 01/02/2024 19:43 amm SM 4500-H+B 01/02/2024 23:37 amm Bicarbonate as HCO3 190 10 mg/L 1 01/02/2024 19:43 amm SM 4500-H+B 01/02/2024 23:37 amm Sulfate 16.9 0.5 mg/L 5002 1 12/29/2023 13:25 ldm EPA 300.0 12/30/2023 02:42 ldm Chloride 9 1 mg/L 5002 1 12/29/2023 13:25 ldm EPA 300.0 12/30/2023 02:42 ldm Nitrate as NO3 11.9 0.4 mg/L 45 1 12/29/2023 13:25 ldm EPA 300.0 12/30/2023 02:42 ldm Nitrite as N ND 0.1 mg/L 1 1 U 12/29/2023 13:25 ldm EPA 300.0 12/30/2023 02:42 ldm Nitrate+Nitrite as N 2.7 0.1 mg/L 10 1 12/29/2023 13:25 ldm EPA 300.0 12/30/2023 02:42 ldm Fluoride ND 0.1 mg/L 2 1 U 12/29/2023 13:25 ldm EPA 300.0 12/30/2023 02:42 ldm Total Anions 3.9 --- meq/L 1 01/02/2024 19:43 amm Calc. 01/02/2024 23:37 amm pH 7.4 --- units 1 12/28/2023 09:20 na SM 4500-H+B 12/28/2023 09:20 na Specific Conductance 369 1 umhos/cm 16002 1 01/02/2024 19:43 amm SM 4500-H+B 01/02/2024 23:37 amm Total Dissolved Solids 260 20 mg/L 10002 1 12/29/2023 15:15 ctl SM 2540 C 01/02/2024 11:50 ctl MBAS,Calc.as LAS,MW 320 Negative 0.1 mg/L 0.52 1 U 12/29/2023 11:52 krh SM 5540 C 12/29/2023 12:50 krh Aggressiveness Index 11.5 1 1 12/28/2023 09:20 na Calc. 12/28/2023 09:20 na Langelier Index(20°C) -0.3 1 1 12/28/2023 09:20 na Calc. 12/28/2023 09:20 na Nitrate Nitrogen 2.7 0.1 mg/L 10 1 12/29/2023 13:25 ldm EPA 300.0 12/30/2023 02:42 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.Lindo Avenue 3442 Empresa Drive,Suite D 9415 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 Env FAX:(805)525-4172/Ag FAX:(805)392-2063 FAX:(209)942-0423 FAX:(530)343-3807 FAX:(805)783-2912 FAX:(559)734-8435 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