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ENVIRONMENTAINW. . , Analytical Chemists May 5, 2023 Lab No. : STK2335191-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : April 26, 2023 at 08:35 1868 East Hazelton Ave. Sampled By : Francisco Garcia Rui Stockton, CA 95205 Received On : April 26, 2023 at 09:15 Description :Wellhead Matrix : Drinking Water Project :20481 S. VanAllen Rd.,Escalon- WP0044385 Sample Results - Inorganic • ,. General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 103 2.5 mg/L 1 04/28/2023 13:00 ac 2340B 04/28/2023 18:23 ac Calcium 28 1 mg/L 1 04/28/2023 13:00 ac EPA 200.7 04/28/2023 18:23 ac Magnesium 8 1 mg/L 1 04/28/2023 13:00 ac EPA 200.7 04/28/2023 18:23 ac Potassium 4 1 mg/L 1 04/28/2023 13:00 ac EPA 200.7 04/28/2023 18:23 ac Sodium 21 1 mg/L 1 04/28/2023 13:00 ac EPA 200.7 04/28/2023 18:23 ac Total Cations 3.1 --- meq/L 1 04/28/2023 13:00 ac Calc. 04/28/2023 18:23 ac Boron 0.1 0.1 mg/L 1 04/28/2023 13:00 ac EPA 200.7 04/28/2023 18:23 ac Copper ND 10 ug/L 10002 1 J 04/28/2023 13:00 ac EPA 200.7 04/28/2023 18:23 ac Iron ND 30 ug/L 3002 1 U 04/28/2023 13:00 ac EPA 200.7 04/28/2023 18:23 ac Manganese ND 10 ug/L 502 1 U 04/28/2023 13:00 ac EPA 200.7 04/28/2023 18:23 ac Zinc ND 20 ug/L 1 J 04/28/2023 13:00 ac EPA 200.7 04/28/2023 18:23 ac SAR 0.9 0.1 1 04/28/2023 13:00 ac Calc. 04/28/2023 18:23 ac Total Alkalinity(as CaCO3) 90 10 mg/L 1 05/02/2023 13:20 amm SM 4500-H+B 05/03/2023 04:01 amm Hydroxide as OH ND 10 mg/L 1 U 05/02/2023 13:20 amm SM 4500-H+B 05/03/2023 04:01 amm Carbonate as CO3 ND 10 mg/L 1 U 05/02/2023 13:20 amm SM 4500-H+B 05/03/2023 04:01 amm Bicarbonate as HCO3 110 10 mg/L 1 05/02/2023 13:20 amm SM 4500-H+B 05/03/2023 04:01 amm Sulfate 37.3 0.5 mg/L 5002 1 04/27/2023 13:49 ldm EPA 300.0 04/28/2023 04:39 ldm Chloride 4 1 mg/L 5002 1 b 04/27/2023 13:49 ldm EPA 300.0 04/28/2023 04:39 ldm Nitrate as NO3 44.2 0.4 mg/L 45 1 1 04/27/2023 13:49 ldm EPA 300.0 04/28/2023 04:39 ldm Nitrite as N ND 0.1 mg/L 1 1 Ub 04/27/2023 13:49 ldm EPA 300.0 04/28/2023 04:39 ldm Nitrate+Nitrite as N 10 0.1 mg/L 10 1 1 04/27/2023 13:49 ldm EPA 300.0 04/28/2023 04:39 ldm Fluoride 0.1 0.1 mg/L 2 1 04/27/2023 13:49 ldm EPA 300.0 04/28/2023 04:39 ldm Total Anions 3.4 --- meq/L 1 bl 05/02/2023 13:20 amm Calc. 05/03/2023 04:01 amm pH 7.8 units 1 04/26/2023 08:40 fgr SM 4500-H+B 04/26/2023 08:40 fgr Specific Conductance 331 1 umhos/cm 16002 1 05/02/2023 13:20 amm SM 4500-H+B 05/03/2023 04:01 amm Total Dissolved Solids 250 20 mg/L 10002 1 04/28/2023 10:05 ctl SM 2540 C 05/01/2023 11:00 ctl MBAS,Calc.as LAS,MW 320 Negative 0.1 mg/L 0.52 1 U 04/27/2023 17:43 krh SM 5540 C 04/27/2023 18:07 krh Aggressiveness Index 11.6 1 1 04/26/2023 08:40 fgr Calc. 04/26/2023 08:40 fgr Langelier Index(20°C) -0.2 1 1 04/26/2023 08:40 fgr Calc. 04/26/2023 08:40 fgr Nitrate Nitrogen 10 0.1 mg/L 10 1 1 04/27/2023 13:49 ldm EPA 300.0 04/28/2023 04:39 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 1 The MS/MSD did not meet QC criteria. 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 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