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ENVIRONMENTAINW. . , Analytical Chemists June 5, 2023 Lab No. : STK2335650-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : May 4, 2023 at 09:20 1868 East Hazelton Ave. Sampled By : Francisco Garcia Rui Stockton, CA 95205 Received On : May 4, 2023 at 09:53 Description :Well Head Matrix : Drinking Water Project :9011 Sedan Ave Manteca Ca 95336 WP0043246 Sample Results - Inorganic • ,. General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 133 2.5 mg/L 1 05/08/2023 12:00 ac 2340B 05/08/2023 16:40 ac Calcium 35 1 mg/L 1 05/08/2023 12:00 ac EPA 200.7 05/08/2023 16:40 ac Magnesium 11 1 mg/L 1 05/08/2023 12:00 ac EPA 200.7 05/08/2023 16:40 ac Potassium 4 1 mg/L 1 05/08/2023 12:00 ac EPA 200.7 05/08/2023 16:40 ac Sodium 37 1 mg/L 1 05/08/2023 12:00 ac EPA 200.7 05/08/2023 16:40 ac Total Cations 4.4 --- meq/L 1 05/08/2023 12:00 ac Calc. 05/08/2023 16:40 ac Boron 0.1 0.1 mg/L 1 05/08/2023 12:00 ac EPA 200.7 05/08/2023 16:40 ac Copper ND 10 ug/L 10002 1 J 05/08/2023 12:00 ac EPA 200.7 05/08/2023 16:40 ac Iron ND 30 ug/L 3002 1 U 05/08/2023 12:00 ac EPA 200.7 05/08/2023 16:40 ac Manganese ND 10 ug/L 502 1 U 05/08/2023 12:00 ac EPA 200.7 05/08/2023 16:40 ac Zinc 20 20 ug/L 1 05/08/2023 12:00 ac EPA 200.7 05/08/2023 16:40 ac SAR 1.4 0.1 1 05/08/2023 12:00 ac Calc. 05/08/2023 16:40 ac Total Alkalinity(as CaCO3) 100 10 mg/L 1 I 05/08/2023 16:26 amm SM 4500-H+B 05/08/2023 17:54 amm Hydroxide as OH ND 10 mg/L 1 U 05/08/2023 16:26 amm SM 4500-H+B 05/08/2023 17:54 amm Carbonate as CO3 ND 10 mg/L 1 U 05/08/2023 16:26 amm SM 4500-H+B 05/08/2023 17:54 amm Bicarbonate as HCO3 120 10 mg/L 1 I 05/08/2023 16:26 amm SM 4500-H+B 05/08/2023 17:54 amm Sulfate 37.5 0.5 mg/L 5002 1 05/05/2023 14:29 Idm EPA 300.0 05/05/2023 21:39 Idm Chloride 20 1 mg/L 5002 1 b 05/05/2023 14:29 Idm EPA 300.0 05/05/2023 21:39 Idm Nitrate as NO3 56.0 0.4 mg/L 45 1 1 05/05/2023 14:29 Idm EPA 300.0 05/05/2023 21:39 Idm Nitrite as N ND 0.1 mg/L 1 1 U 05/05/2023 14:29 Idm EPA 300.0 05/05/2023 21:39 Idm. Nitrate+Nitrite as N 12.6 0.1 mg/L 10 1 1 05/05/2023 14:29 Idm EPA 300.0 05/05/2023 21:39 Idm. Fluoride 0.1 0.1 mg/L 2 1 05/05/2023 14:29 Idm EPA 300.0 05/05/2023 21:39 Idm. Total Anions 4.2 --- meq/L 1 Ibl 05/08/2023 16:26 amm Calc. 05/08/2023 17:54 amm pH 2.6 units 1 05/04/2023 09:20 fgr SM 4500-H+B 05/04/2023 09:20 fgr Specific Conductance 419 1 umhos/cm 16002 1 05/08/2023 16:26 amm SM 4500-H+B 05/08/2023 17:54 amm Total Dissolved Solids 340 20 mg/L 10002 1 05/08/2023 11:45 ctl SM 2540 C 05/09/2023 12:45 ctl MBAS,Calc.as LAS,MW 320 Negative 0.1 mg/L 0.52 1 U 05/05/2023 16:16 krh SM 5540 C 05/05/2023 16:24 krh Aggressiveness Index 6.5 1 1 05/04/2023 09:20 fgr Calc. 05/04/2023 09:20 fgr Langelier Index(20°C) -5.3 1 1 I 05/04/2023 09:20 fgr Calc. 05/04/2023 09:20 fgr Nitrate Nitrogen 12.6 0.1 mg/L 10 1 1 05/05/2023 14:29 Idm EPA 300.0 05/05/2023 21:39 Idm Metals,Total Arsenic 10 1 ug/L 10 1 h 05/08/2023 09:00 ac EPA 200.8 05/08/2023 12:10 ac 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. I The RPD for the laboratory duplicate exceeded laboratory criteria. b The Blank was positive for constituent but less than the PQL 1 The MS/MSD did not meet QC criteria. h The MS/MSD did not meet QC criteria. Section: Sample Results Page 2 of 9 Page 2 of 9 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