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.O `AGRICULTURAL Analytical Chemists June 9, 2022 Lab No. : STK2236204-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Steven Shih Sampled On : May 4, 2022 at 09:30 1868 East Hazelton Ave. Sampled By : Aaron Gooderham Stockton, CA 95205 Received On : May 4, 2022 at 15:00 Description : Wellhead Matrix : Drinking Water Project 23762 Arthur Road Sample Results - Inorganic Sample AnalysisGeneral Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 58.7 2.5 mg/L 1 05/10/2022 08:00 ac EPA 200.7 05/10/2022 17:24 ac Calcium 12 1 mg/L 1 05/10/2022 08:00 ac EPA 200.7 05/10/2022 17:24 ac Magnesium 7 1 mg/L 1 05/10/2022 08:00 ac EPA 200.7 05/10/2022 17:24 ac Potassium 3 1 mg/L 1 05/10/2022 08:00 ac EPA 200.7 05/10/2022 17:24 ac Sodium 16 1 mg/L 1 05/10/2022 08:00 ac EPA 200.7 05/10/2022 17:24 ac Total Cations 1.9 --- meq/L 1 05/10/2022 08:00 ac EPA 200.7 05/10/2022 17:24 ac Boron ND 0.1 mg/L 1 J 05/10/2022 08:00 ac EPA 200.7 05/10/2022 17:24 ac Copper ND 10 ug/L 10002 1 J 05/10/2022 08:00 ac EPA 200.7 05/10/2022 17:24 ac Iron ND 30 ug/L 3002 1 U 05/10/2022 08:00 ac EPA 200.7 05/10/2022 17:24 ac Manganese ND 10 ug/L 502 1 U 05/10/2022 08:00 ac EPA 200.7 05/10/2022 17:24 ac Zinc ND 20 ug/L 1 J 05/10/2022 08:00 ac EPA 200.7 05/10/2022 17:24 ac SAR 0.9 0.1 1 05/10/2022 08:00 ac EPA 200.7 05/10/2022 17:24 ac Total Alkalinity(as CaCO3) 80 10 mg/L 1 05/16/2022 09:58 amm SM 2320 B 05/16/2022 17:23 amm Hydroxide as OH ND 10 mg/L 1 U 05/16/2022 09:58 amm SM 2320 B 05/16/2022 17:23 amm Carbonate as CO3 ND 10 mg/L 1 U 05/16/2022 09:58 amm SM 2320 B 05/16/2022 17:23 amm Bicarbonate as HCO3 100 10 mg/L 1 05/16/2022 09:58 amm SM 2320 B 05/16/2022 17:23 amm Sulfate 3.3 0.5 mg/L 5002 1 T 06/02/2022 09:48 njb EPA 300.0 06/02/2022 16:12 njb Chloride 6 1 mg/L 5002 1 T 06/02/2022 09:48 njb EPA 300.0 06/02/2022 16:12 njb Nitrate as NO3 13.4 0.4 mg/L 45 1 T 06/02/2022 09:48 njb EPA 300.0 06/02/2022 16:12 njb Nitrite as N ND 0.1 mg/L 1 1 UT 06/02/2022 09:48 njb EPA 300.0 06/02/2022 16:12 njb Nitrate+Nitrite as N 3.0 0.1 mg/L 10 1 T 06/02/2022 09:48 njb EPA 300.0 06/02/2022 16:12 njb Fluoride 0.2 0.1 mg/L 2 1 T 06/02/2022 09:48 njb EPA 300.0 06/02/2022 16:12 njb Total Anions 2.1 --- meq/L 1 05/16/2022 09:58 amm SM 2320 B 05/16/2022 17:23 amm pH 7.3 --- units 1 05/04/2022 09:30 ag SM 4500-H+B 05/04/2022 09:30 ag Specific Conductance 212 1 umhos/cm 16002 1 05/24/2022 12:54 sta. SM 2510 B 05/24/2022 12:54 sta Total Dissolved Solids 200 20 mg/L 10002 1 05/09/2022 11:09 ctl SM 2540 C 05/10/2022 11:56 ctl MBAS(foaming agents) Negative 0.1 mg/L 0.52 1 05/06/2022 07:03 jba SM 5540 C 05/06/2022 07:15 jba Aggressiveness Index 10.7 1 1 05/04/2022 09:30 ag SM 4500-H+B 05/04/2022 09:30 ag Langelier Index(20°C) -1.1 1 1 05/04/2022 09:30 ag SM 4500-H+B 05/04/2022 09:30 ag Nitrate Nitrogen 3.0 0.1 mg/L 10 1 T 06/02/2022 09:48 njb EPA 300.0 06/02/2022 16:12 njb DQF Flags Definition: J Reported value is estimated;detected at a concentration below the PQL 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 7 Page 3 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