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.O `AGRICULTURAL Analytical Chemists March 21, 2023 Lab No. : STK2332743-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Steven Shih Sampled On : March 1, 2023 at 11:30 1868 East Hazelton Ave. Sampled By : Aaron Gooderham Stockton, CA 95205 Received On : March 1, 2023 at 15:20 Description Wellhead Matrix : Drinking Water Project 9936 E. Lyons Rd-WP6043967 Sample Results - Inorganic 91 _ • . General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 289 2.5 mg/L 1 03/03/2023 13:00 ac EPA 200.7 03/03/2023 14:10 ac Calcium 83 1 mg/L 1 03/03/2023 13:00 ac EPA 200.7 03/03/2023 14:10 ac Magnesium 20 1 mg/L 1 03/03/2023 13:00 ac EPA 200.7 03/03/2023 14:10 ac Potassium 7 1 mg/L 1 03/03/2023 13:00 ac EPA 200.7 03/03/2023 14:10 ac Sodium 106 1 mg/L 1 1 03/03/2023 13:00 ac EPA 200.7 03/03/2023 14:10 ac Total Cations 10.6 --- meq/L 1 1 03/03/2023 13:00 ac EPA 200.7 03/03/2023 14:10 ac Boron 0.1 0.1 mg/L 1 03/03/2023 13:00 ac EPA 200.7 03/03/2023 14:10 ac Copper 60 10 ug/L 10002 1 03/03/2023 13:00 ac EPA 200.7 03/03/2023 14:10 ac Iron 30 30 ug/L 3002 1 03/03/2023 13:00 ac EPA 200.7 03/03/2023 14:10 ac Manganese 390 10 ug/L 502 1 03/03/2023 13:00 ac EPA 200.7 03/03/2023 14:10 ac Zinc 70 20 ug/L 1 03/03/2023 13:00 ac EPA 200.7 03/03/2023 14:10 ac SAR 2.7 0.1 1 1 03/03/2023 13:00 ac EPA 200.7 03/03/2023 14:10 ac Total Alkalinity(as CaCO3) 110 10 mg/L 1 03/06/2023 13:57 amm SM 4500-H+B 03/06/2023 22:39 amm Hydroxide as OH ND 10 mg/L 1 U 03/06/2023 13:57 amm SM 4500-H+B 03/06/2023 22:39 amm Carbonate as CO3 ND 10 mg/L 1 U 03/06/2023 13:57 amm SM 4500-H+B 03/06/2023 22:39 amm Bicarbonate as HCO3 130 10 mg/L 1 03/06/2023 13:57 amm SM 4500-H+B 03/06/2023 22:39 amm Sulfate 5.9 0.5 mg/L 5002 1 03/02/2023 15:04 1dm EPA 300.0 03/03/2023 04:33 ldm Chloride 377 7* mg/L 5002 7 03/02/2023 15:04 ldm EPA 300.0 03/03/2023 11:51 ldm Nitrate as NO3 ND 0.4 mg/L 45 1 U 03/02/2023 15:04 ldm EPA 300.0 03/03/2023 04:33 ldm Nitrite as N ND 0.1 mg/L 1 1 U 03/02/2023 15:04 ldm EPA 300.0 03/03/2023 04:33 ldm Nitrate+Nitrite as N ND 0.1 mg/L 10 1 U 03/02/2023 15:04 ldm EPA 300.0 03/03/2023 04:33 ldm Fluoride ND 0.1 mg/L 2 1 J 03/02/2023 15:04 ldm EPA 300.0 03/03/2023 04:33 ldm Total Anions 12.9 --- meq/L 1 J 03/06/2023 13:57 amm SM 4500-H+B 03/06/2023 22:39 amm pH 7.2 units 1 03/01/2023 11:30 ag 03/01/2023 11:30 ag Specific Conductance 1420 1 umhos/cm 16002 1 03/06/2023 13:57 amm SM 4500-H+B 03/06/2023 22:39 amm Total Dissolved Solids 1020 20 mg/L 10002 1 03/03/2023 12:00 ctl SM 2540 C 03/06/2023 10:30 ctl MBAs(foaming agents) Negative 0.1 mg/L 0.52 1 U 03/02/2023 15:21 krh SM 5540 C 03/02/2023 15:48 krh Aggressiveness Index 11.6 1 1 03/01/2023 11:30 ag 03/01/2023 11:30 ag Langelier Index(20°C) -0.3 1 1 03/01/2023 11:30 ag 03/01/2023 11:30 ag Nitrate Nitrogen ND 0.1 mg/L 10 1 U 03/02/2023 15:04 ldm EPA 300.0 03/03/2023 04:33 ldm DQF Flags Definition: 1 The MS/MSD did not meet QC criteria. U Constituent results were non-detect. J Reported value is estimated;detected at a concentration below the RL and above the laboratory MDL. 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