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.O `AGRICULTURAL Analytical Chemists June 10, 2024 Lab No. : STK2437076-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : May 16, 2024 at 08:40 1868 East Hazelton Ave. Sampled By : Rena LeRoy Stockton, CA 95205 Received On : May 16, 2024 at 09:18 Description Wellhead Matrix : Drinking Water Project 7650 Borba Rd,Stkn CA-WP0042882 Sample Results - Inorganic Sample AnalysisGeneral Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 2600 4.1 mg/L 05/20/2024 12:00 ac 2340B 05/21/2024 17:37 ac Calcium 647 5* mg/L 5 05/20/2024 12:00 ac EPA 200.7 05/21/2024 17:37 ac Magnesium 240 1 mg/L 1 05/20/2024 12:00 ac EPA 200.7 05/20/2024 15:54 ac Potassium 5 1 mg/L 1 05/20/2024 12:00 ac EPA 200.7 05/20/2024 15:54 ac Sodium 1500 5* mg/L 5 05/20/2024 12:00 ac EPA 200.7 05/21/2024 17:37 ac Total Cations 117 5 meq/L 05/20/2024 12:00 ac Calc. 05/21/2024 17:37 ac Boron 0.4 0.1 mg/L 1 05/20/2024 12:00 ac EPA 200.7 05/20/2024 15:54 ac Copper ND 10 ug/L 10002 1 U 05/20/2024 12:00 ac EPA 200.7 05/20/2024 15:54 ac Iron 190 30 ug/L 3002 1 05/20/2024 12:00 ac EPA 200.7 05/20/2024 15:54 ac Manganese 4900 50* ug/L 502 5 05/20/2024 12:00 ac EPA 200.7 05/21/2024 17:37 ac Zinc 12900 100* ug/L 5000 5 05/20/2024 12:00 ac EPA 200.7 05/21/2024 17:37 ac SAR 12.8 05/20/2024 12:00 ac Calc. 05/21/2024 17:37 ac Total Alkalinity(as CaCO3) 320 10 mg/L 1 05/28/2024 17:20 amm SM 4500-H+B 05/29/2024 03:31 amm Hydroxide as OH ND 10 mg/L 1 U 05/28/2024 17:20 amm SM 4500-H+B 05/29/2024 03:31 amm Carbonate as CO3 ND 10 mg/L 1 U 05/28/2024 17:20 amm SM 4500-H+B 05/29/2024 03:31 amm Bicarbonate as HCO3 400 10 mg/L 1 05/28/2024 17:20 amm SM 4500-H+B 05/29/2024 03:31 amm Sulfate 134 5* mg/L 5002 10 06/03/2024 14:55 ldm EPA 300.0 06/04/2024 01:23 ldm Chloride 4000 80* mg/L 5002 80 06/03/2024 14:55 ldm EPA 300.0 06/04/2024 07:42 ldm Nitrate as NO3 ND 0.4 mg/L 45 1 U 05/17/2024 15:40 ilp SM 4500-NO3 F 05/17/2024 17:03 ilp Nitrite as N ND 0.2 mg/L 1 1 U 05/17/2024 15:40 ilp SM 4500-NO3 F 05/17/2024 17:01 ilp Nitrate+Nitrite as N ND 0.4 mg/L 10 1 U 05/17/2024 15:40 ilp SM 4500-NO3 F 05/17/2024 17:03 ilp Fluoride ND 1* mg/L 2 10 U 06/03/2024 14:55 ldm EPA 300.0 06/04/2024 01:23 ldm Total Anions 122 80 meq/L 06/03/2024 14:55 ldm Calc. 06/04/2024 07:42 ldm pH 7.60 --- units 1 05/16/2024 08:40 rl SM 4500-H+B 05/16/2024 08:40 rl Specific Conductance 12600 1 umhos/cm 16002 1 05/28/2024 17:20 amm SM 4500-H+B 05/29/2024 03:31 amm Total Dissolved Solids 9770 20 mg/L 10002 1 05/20/2024 12:30 ctl SM 2540 C 05/21/2024 10:00 ctl MBAS,Calc.as LAS,MW 320 Positive 0.1 mg/L 0.52 1 U 05/17/2024 14:06 krh SM 5540 C 05/17/2024 14:14 krh Aggressiveness Index 13.3 10 --- 05/20/2024 12:00 ac Calc. 05/21/2024 17:37 ac Langelier Index(20°C) 1.3 20 --- 05/20/2024 12:00 ac Calc. 05/21/2024 17:37 ac Nitrate Nitrogen ND 0.4 mg/L 10 1 U 05/17/2024 15:40 ilp SM 4500-NO3 F 05/17/2024 17:03 ilp DQF Flags Definition: U Constituent results were non-detect. ND=Non-Detected, RL=Reporting Level*RL adjusted 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 8 Page 2 of 8 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