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.O `AGRICULTURAL Analytical Chemists February 23, 2023 Lab No. : STK2331696-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Steven Shih Sampled On : February 7, 2023 at 11:25 1868 East Hazelton Ave. Sampled By : Aldara Salinas Stockton, CA 95205 Received On : February 7, 2023 at 12:06 Description :Wellhead Matrix : Drinking Water Project :5161 W. 11th Street, Tracy, CA 95304 (WP0043835) Sample Results - Inorganic Sample AnalysisGeneral Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 167 2.5 mg/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 21:17 ac Calcium 39 1 mg/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 21:17 ac Magnesium 17 1 mg/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 21:17 ac Potassium 4 1 mg/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 21:17 ac Sodium 116 1 mg/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 21:17 ac Total Cations 8.5 --- meq/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 21:17 ac Boron 0.7 0.1 mg/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 21:17 ac Copper 20 10 ug/L 10002 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 21:17 ac Iron ND 30 ug/L 3002 1 J 02/10/2023 12:00 ac EPA 200.7 02/10/2023 21:17 ac Manganese 160 10 ug/L 502 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 21:17 ac Zinc 40 20 ug/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 21:17 ac SAR 3.9 0.1 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 21:17 ac Total Alkalinity(as CaCO3) 120 10 mg/L 1 02/12/2023 17:28 amm SM 4500-H+B 02/13/2023 06:01 amm Hydroxide as OH ND 10 mg/L 1 U 02/12/2023 17:28 amm SM 4500-H+B 02/13/2023 06:01 amm Carbonate as CO3 ND 10 mg/L 1 U 02/12/2023 17:28 amm SM 4500-H+B 02/13/2023 06:01 amm Bicarbonate as HCO3 150 10 mg/L 1 02/12/2023 17:28 amm SM 4500-H+B 02/13/2023 06:01 amm Sulfate 190 1* mg/L 5002 2 02/08/2023 10:36 ldm EPA 300.0 02/09/2023 11:44 ldm Chloride 85 1 mg/L 5002 1 02/08/2023 10:36 ldm EPA 300.0 02/08/2023 22:10 ldm Nitrate as NO3 ND 0.4 mg/L 45 1 U 02/08/2023 10:36 ldm EPA 300.0 02/08/2023 22:10 ldm Nitrite as N ND 0.1 mg/L 1 1 Ub 02/08/2023 10:36 ldm EPA 300.0 02/08/2023 22:10 ldm Nitrate+Nitrite as N ND 0.1 mg/L 10 1 U 02/08/2023 10:36 ldm EPA 300.0 02/08/2023 22:10 ldm Fluoride ND 0.1 mg/L 2 1 J 02/08/2023 10:36 ldm EPA 300.0 02/08/2023 22:10 ldm Total Anions 8.8 --- meq/L 1 Jb 02/12/2023 17:28 amm SM 4500-H+B 02/13/2023 06:01 amm pH 7.54 --- units 1 02/07/2023 11:25 as 02/07/2023 11:25 as Specific Conductance 953 1 umhos/cm 16002 1 02/12/2023 17:28 amm SM 4500-H+B 02/13/2023 06:01 amm Total Dissolved Solids 630 20 mg/L 10002 1 02/09/2023 10:13 ctl SM 2540 C 02/10/2023 12:56 ctl MBAS(foaming agents) Negative 0.1 mg/L 0.52 1 U 02/08/2023 17:22 jba SM 5540 C 02/08/2023 17:23 jba Aggressiveness Index 11.6 1 1 02/07/2023 11:25 as 02/07/2023 11:25 as Langelier Index(20°C) -0.3 1 1 02/07/2023 11:25 as 02/07/2023 11:25 as Nitrate Nitrogen ND 0.1 mg/L 10 1 U 02/08/2023 10:36 ldm EPA 300.0 02/08/2023 22:10 ldm DQF Flags Definition: J Reported value is estimated;detected at a concentration below the RL and above the laboratory MDL. U Constituent results were non-detect. b The Blank was positive for constituent but less than the PQL ND=Non-Detected, RL=Reporting Level*RL adusted 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 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 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