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.O `AGRICULTURAL Analytical Chemists June 28, 2024 Lab No. : STK2438835-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On :June 13, 2024 at 13:30 1868 East Hazelton Ave. Sampled By : Aaron Gooderham Stockton, CA 95205 Received On :June 13, 2024 at 15:05 Description : Wellhead Matrix : Drinking Water Project 3857 Emerson Rd-WP0044517 Sample Results - Inorganic EL Sample General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 99.3 2.5 mg/L 06/17/2024 13:00 ac 2340B 06/17/2024 14:22 ac Calcium 20 1 mg/L 1 06/17/2024 13:00 ac EPA 200.7 06/17/2024 14:22 ac Magnesium 12 1 mg/L 1 06/17/2024 13:00 ac EPA 200.7 06/17/2024 14:22 ac Potassium 4 1 mg/L 1 06/17/2024 13:00 ac EPA 200.7 06/17/2024 14:22 ac Sodium 11 1 mg/L 1 06/17/2024 13:00 ac EPA 200.7 06/17/2024 14:22 ac Total Cations 2.6 1 meq/L 06/17/2024 13:00 ac Calc. 06/17/2024 14:22 ac Boron ND 0.1 mg/L 1 U 06/17/2024 13:00 ac EPA 200.7 06/17/2024 14:22 ac Copper ND 10 ug/L 10002 1 U 06/17/2024 13:00 ac EPA 200.7 06/17/2024 14:22 ac Iron ND 30 ug/L 3002 1 U 06/17/2024 13:00 ac EPA 200.7 06/17/2024 14:22 ac Manganese ND 10 ug/L 502 1 U 06/17/2024 13:00 ac EPA 200.7 06/17/2024 14:22 ac Zinc 30 20 ug/L 5000 1 1 06/17/2024 13:00 ac EPA 200.7 06/17/2024 14:22 ac SAR 0.5 06/17/2024 13:00 ac Calc. 06/17/2024 14:22 ac Total Alkalinity(as CaCO3) 100 10 mg/L 1 06/16/2024 19:40 amm SM 4500-H+B 06/17/2024 12:27 amm Hydroxide as OH ND 10 mg/L 1 U 06/16/2024 19:40 amm SM 4500-H+B 06/17/2024 12:27 amm Carbonate as CO3 ND 10 mg/L 1 U 06/16/2024 19:40 amm SM 4500-H+B 06/17/2024 12:27 amm Bicarbonate as HCO3 130 10 mg/L 1 06/16/2024 19:40 amm SM 4500-H+B 06/17/2024 12:27 amm Sulfate 7.0 0.5 mg/L 5002 1 06/17/2024 14:47 1dm EPA 300.0 06/17/2024 19:01 ldm Chloride 9 1 mg/L 5002 1 06/17/2024 14:47 ldm EPA 300.0 06/17/2024 19:01 ldm Nitrate as NO3 3.8 0.4 mg/L 45 1 T 06/17/2024 14:47 ldm EPA 300.0 06/17/2024 19:01 ldm Nitrite as N ND 0.1 mg/L 1 1 UT 06/17/2024 14:47 ldm EPA 300.0 06/17/2024 19:01 ldm Nitrate+Nitrite as N 0.9 0.1 mg/L 10 1 T 06/17/2024 14:47 ldm EPA 300.0 06/17/2024 19:01 ldm Fluoride 0.1 0.1 mg/L 2 1 06/17/2024 14:47 ldm EPA 300.0 06/17/2024 19:01 ldm Total Anions 2.6 10 meq/L 06/17/2024 14:47 ldm Calc. 06/17/2024 19:01 ldm pH 7.40 --- units 1 06/13/2024 13:30 ag SM 4500-H+B 06/13/2024 13:30 ag Specific Conductance 254 1 umhos/cm 16002 1 06/16/2024 19:40 amm SM 4500-H+B 06/17/2024 12:27 amm Total Dissolved Solids 200 20 mg/L 10002 1 06/17/2024 10:40 ctl SM 2540 C 06/18/2024 12:00 ctl MBAS,Calc.as LAS,MW 320 Negative 0.1 mg/L 0.52 1 U 06/14/2024 14:54 krh SM 5540 C 06/14/2024 15:17 krh Aggressiveness Index 11.1 10 --- 06/17/2024 13:00 ac Calc. 06/17/2024 14:22 ac Langelier Index(20°C) -0.7 20 --- 06/17/2024 13:00 ac Calc. 06/17/2024 14:22 ac Nitrate Nitrogen 0.9 0.1 mg/L 10 1 T 06/17/2024 14:47 ldm EPA 300.0 06/17/2024 19:01 ldm DQF Flags Definition: U Constituent results were non-detect. 1 The MS/MSD did not meet QC criteria. 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 8 Page 3 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