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.O `AGRICULTURAL Analytical Chemists June 10, 2024 Lab No. : STK2437645-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : May 28, 2024 at 12:30 1868 East Hazelton Ave. Sampled By : Aaron Gooderham Stockton, CA 95205 Received On : May 28, 2024 at 14:40 Description : Wellhead Matrix : Drinking Water Project 19007 Sierra View Court-WP0044873 Sample Results - Inorganic 91 _ • . General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 149 2.5 mg/L 05/30/2024 10:00 ac 2340B 05/30/2024 12:37 ac Calcium 30 1 mg/L 1 05/30/2024 10:00 ac EPA 200.7 05/30/2024 12:37 ac Magnesium 18 1 mg/L 1 05/30/2024 10:00 ac EPA 200.7 05/30/2024 12:37 ac Potassium 6 1 mg/L 1 05/30/2024 10:00 ac EPA 200.7 05/30/2024 12:37 ac Sodium 16 1 mg/L 1 05/30/2024 10:00 ac EPA 200.7 05/30/2024 12:37 ac Total Cations 3.8 1 meq/L 05/30/2024 10:00 ac Calc. 05/30/2024 12:37 ac Boron ND 0.1 mg/L 1 U 05/30/2024 10:00 ac EPA 200.7 05/30/2024 12:37 ac Copper 20 10 ug/L 10002 1 05/30/2024 10:00 ac EPA 200.7 05/30/2024 12:37 ac Iron ND 30 ug/L 3002 1 U 05/30/2024 10:00 ac EPA 200.7 05/30/2024 12:37 ac Manganese ND 10 ug/L 502 1 U 05/30/2024 10:00 ac EPA 200.7 05/30/2024 12:37 ac Zinc 30 20 ug/L 5000 1 05/30/2024 10:00 ac EPA 200.7 05/30/2024 12:37 ac SAR 0.6 05/30/2024 10:00 ac Calc. 05/30/2024 12:37 ac Total Alkalinity(as CaCO3) 130 10 mg/L 1 06/04/2024 19:22 amm SM 4500-H+B 06/05/2024 05:47 amm Hydroxide as OH ND 10 mg/L 1 U 06/04/2024 19:22 amm SM 4500-H+B 06/05/2024 05:47 amm Carbonate as CO3 ND 10 mg/L 1 U 06/04/2024 19:22 amm SM 4500-H+B 06/05/2024 05:47 amm Bicarbonate as HCO3 160 10 mg/L 1 06/04/2024 19:22 amm SM 4500-H+B 06/05/2024 05:47 amm Sulfate 11.6 0.5 mg/L 5002 1 05/29/2024 10:36 ldm EPA 300.0 05/29/2024 20:09 ldm Chloride 23 1 mg/L 5002 1 05/29/2024 10:36 ldm EPA 300.0 05/29/2024 20:09 ldm Nitrate as NO3 8.2 0.4 mg/L 45 1 05/29/2024 10:36 ldm EPA 300.0 05/29/2024 20:09 ldm Nitrite as N ND 0.1 mg/L 1 1 U 05/29/2024 10:36 ldm EPA 300.0 05/29/2024 20:09 ldm Nitrate+Nitrite as N 1.9 0.1 mg/L 10 1 05/29/2024 10:36 ldm EPA 300.0 05/29/2024 20:09 ldm Fluoride 0.2 0.1 mg/L 2 1 05/29/2024 10:36 ldm EPA 300.0 05/29/2024 20:09 ldm Total Anions 3.6 10 meq/L 05/29/2024 10:36 ldm Calc. 05/29/2024 20:09 ldm pH 7.0 --- units 1 05/28/2024 12:30 ag SM 4500-H+B 05/28/2024 12:30 ag Specific Conductance 366 1 umhos/cm 16002 1 06/04/2024 19:22 amm SM 4500-H+B 06/05/2024 05:47 amm Total Dissolved Solids 260 20 mg/L 10002 1 05/30/2024 13:00 ctl SM 2540 C 05/31/2024 13:00 ctl MBAS,Calc.as LAS,MW 320 Negative 0.1 mg/L 0.52 1 U 05/29/2024 15:23 krh SM 5540 C 05/29/2024 15:38 krh Aggressiveness Index 11.0 10 --- 05/30/2024 10:00 ac Calc. 05/30/2024 12:37 ac Langelier Index(20°C) -0.8 20 --- 05/30/2024 10:00 ac Calc. 05/30/2024 12:37 ac Nitrate Nitrogen 1.9 0.1 mg/L 10 1 05/29/2024 10:36 ldm EPA 300.0 05/29/2024 20:09 ldm DQF Flags Definition: U Constituent results were non-detect. 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