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.O `AGRICULTURAL Analytical Chemists March 30, 2023 Lab No. : STK2331644-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Steven Shih Sampled On : February 6, 2023 at 14:05 1868 East Hazelton Ave. Sampled By : Frank Giardi Stockton, CA 95205 Received On : February 6, 2023 at 14:50 Description :Wellhead Matrix : Drinking Water Project : 11320 Eight Mile Road, Stockton- WP0042485 Sample Results - Inorganic "Win Sample Analysis General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 274 2.5 mg/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 22:35 ac Calcium 67 1 mg/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 22:35 ac Magnesium 26 1 mg/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 22:35 ac Potassium 5 1 mg/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 22:35 ac Sodium 28 1 mg/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 22:35 ac Total Cations 6.8 --- meq/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 22:35 ac Boron ND 0.1 mg/L 1 J 02/10/2023 12:00 ac EPA 200.7 02/10/2023 22:35 ac Copper 40 10 ug/L 10002 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 22:35 ac Iron 460 30 ug/L 3002 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 22:35 ac Manganese 20 10 ug/L 502 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 22:35 ac Zinc 90 20 ug/L 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 22:35 ac SAR 0.7 0.1 1 02/10/2023 12:00 ac EPA 200.7 02/10/2023 22:35 ac Total Alkalinity(as CaCO3) 160 10 mg/L 1 02/12/2023 17:28 amm SM 4500-H+B 02/13/2023 06:41 amm Hydroxide as OH ND 10 mg/L 1 U 02/12/2023 17:28 amm SM 4500-H+B 02/13/2023 06:41 amm Carbonate as CO3 ND 10 mg/L 1 U 02/12/2023 17:28 amm SM 4500-H+B 02/13/2023 06:41 amm Bicarbonate as HCO3 190 10 mg/L 1 02/12/2023 17:28 amm SM 4500-H+B 02/13/2023 06:41 amm Sulfate 17.2 0.5 mg/L 5002 1 T 03/21/2023 12:03 ldm EPA 300.0 03/21/2023 17:10 ldm Chloride 11 1 mg/L 5002 1 T 03/21/2023 12:03 ldm EPA 300.0 03/21/2023 17:10 ldm Nitrate as NO3 11.9 0.4 mg/L 45 1 T 03/21/2023 12:03 ldm EPA 300.0 03/21/2023 17:10 ldm Nitrite as N ND 0.1 mg/L 1 1 JT 03/21/2023 12:03 ldm EPA 300.0 03/21/2023 17:10 ldm Fluoride 0.1 0.1 mg/L 2 1 T 03/21/2023 12:03 ldm EPA 300.0 03/21/2023 17:10 ldm Total Anions 4.0 --- meq/L 1 J 02/12/2023 17:28 amm SM 4500-H+B 02/13/2023 06:41 amm pH 7.12 --- units 1 02/06/2023 14:05 fg 02/06/2023 14:05 fg Specific Conductance 384 1 umhos/cm 16002 1 02/12/2023 17:28 amm SM 4500-H+B 02/13/2023 06:41 amm Total Dissolved Solids 270 20 mg/L 10002 1 02/08/2023 09:51 ctl SM 2540 C 02/09/2023 11:26 ctl MBAS(foaming agents) Negative 0.1 mg/L 0.52 1 U 02/07/2023 16:41 jba SM 5540 C 02/07/2023 16:45 jba Aggressiveness Index 11.5 1 1 02/06/2023 14:05 fg 02/06/2023 14:05 fg Langelier Index(20°C) -0.3 1 1 02/06/2023 14:05 fg 02/06/2023 14:05 fg Nitrate Nitrogen 2.7 0.1 mg/L 10 1 T 03/21/2023 12:03 ldm EPA 300.0 03/21/2023 17:10 ldm Metals,Total Arsenic 2 1 ug/L 10 1 03/29/2023 10:00 ac EPA 200.8 03/29/2023 15:29 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. T Exceeded method/regulatory-specific holding time. 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 3 of 9 Page 3 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