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•O Analytical Chemists May 7, 2024 Lab No. : STK2435983-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : April 30, 2024 at 08:53 1868 East Hazelton Ave. Sampled By : Aldara Salinas Stockton, CA 95205 Received On : April 30, 2024 at 11:50 Description :Wellhead Matrix : Drinking Water Project :9988 W. Howard Rd., Stockton- WP0040954 Sample Results - Inorganic Sample AnalysisGeneral Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 612 2.5 mg/L 05/02/2024 08:00 ac 2340B 05/02/2024 11:51 ac Calcium 133 1 mg/L 1 05/02/2024 08:00 ac EPA 200.7 05/02/2024 11:51 ac Magnesium 68 1 mg/L 1 05/02/2024 08:00 ac EPA 200.7 05/02/2024 11:51 ac Potassium 3 1 mg/L 1 05/02/2024 08:00 ac EPA 200.7 05/02/2024 11:51 ac Sodium 242 1 mg/L 1 05/02/2024 08:00 ac EPA 200.7 05/02/2024 11:51 ac Total Cations 22.8 1 meq/L 05/02/2024 08:00 ac Calc. 05/02/2024 11:51 ac Boron 0.4 0.1 mg/L 1 05/02/2024 08:00 ac EPA 200.7 05/02/2024 11:51 ac Copper ND 10 ug/L 10002 1 U 05/02/2024 08:00 ac EPA 200.7 05/02/2024 11:51 ac Iron 1320 30 ug/L 3002 1 05/02/2024 08:00 ac EPA 200.7 05/02/2024 11:51 ac Manganese 1600 10 ug/L 502 1 05/02/2024 08:00 ac EPA 200.7 05/02/2024 11:51 ac Zinc ND 20 ug/L 5000 1 U 05/02/2024 08:00 ac EPA 200.7 05/02/2024 11:51 ac SAR 4.3 05/02/2024 08:00 ac Calc. 05/02/2024 11:51 ac Total Alkalinity(as CaCO3) 220 10 mg/L 1 05/05/2024 15:12 amm SM 4500-H+B 05/06/2024 00:53 amm Hydroxide as OH ND 10 mg/L 1 U 05/05/2024 15:12 amm SM 4500-H+B 05/06/2024 00:53 amm Carbonate as CO3 ND 10 mg/L 1 U 05/05/2024 15:12 amm SM 4500-H+B 05/06/2024 00:53 amm Bicarbonate as HCO3 270 10 mg/L 1 05/05/2024 15:12 amm SM 4500-H+B 05/06/2024 00:53 amm Sulfate 106 0.5 mg/L 5002 1 05/01/2024 10:29 ldm EPA 300.0 05/01/2024 19:27 ldm Chloride 670 13* mg/L 5002 10 b 05/01/2024 10:29 ldm EPA 300.0 05/02/2024 03:26 ldm Nitrate as NO3 ND 0.4 mg/L 45 1 Ul 05/01/2024 10:29 ldm EPA 300.0 05/01/2024 19:27 ldm Nitrite as N ND 0.1 mg/L 1 1 U 05/01/2024 10:29 ldm EPA 300.0 05/01/2024 19:27 ldm Nitrate+Nitrite as N ND 0.1 mg/L 10 1 Jl 05/01/2024 10:29 ldm EPA 300.0 05/01/2024 19:27 ldm Fluoride ND 0.1 mg/L 2 1 U 05/01/2024 10:29 ldm EPA 300.0 05/01/2024 19:27 ldm Total Anions 25.5 13 meq/L 05/01/2024 10:29 ldm Calc. 05/02/2024 03:26 ldm pH 7.44 --- units 1 04/30/2024 08:53 as SM 4500-H+B 04/30/2024 08:53 as Specific Conductance 2700 1 umhos/cm 16002 1 05/05/2024 15:12 amm SM 4500-H+B 05/06/2024 00:53 amm Total Dissolved Solids 1740 20 mg/L 10002 1 05/02/2024 12:45 ctl SM 2540 C 05/03/2024 10:00 ctl MBAS,Calc.as LAS,MW 320 Negative 0.1 mg/L 0.52 1 U 05/01/2024 14:28 krh SM 5540 C 05/01/2024 14:40 krh Aggressiveness Index 12.3 10 --- 05/02/2024 08:00 ac Calc. 05/02/2024 11:51 ac Langelier Index(20°C) 0.4 20 --- 05/02/2024 08:00 ac Calc. 05/02/2024 11:51 ac Nitrate Nitrogen ND 0.1 mg/L 10 1 Ul 05/01/2024 10:29 ldm EPA 300.0 05/01/2024 19:27 ldm DQF Flags Definition: 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. J Reported value is estimated;detected at a concentration below the RL and above the laboratory MDL. 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