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.O `AGRICULTURAL Analytical Chemists March 8, 2023 Lab No. : STK2332028-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Steven Shih Sampled On : February 13, 2023 at 09:30 1868 East Hazelton Ave. Sampled By : Aaron Gooderham Stockton, CA 95205 Received On : February 13, 2023 at 12:00 Description : Wellhead Matrix : Drinking Water Project 31296 Rossier Road Sample Results - Inorganic Sample AnalysisGeneral Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 107 2.5 mg/L 1 02/14/2023 15:00 ac EPA 200.7 02/14/2023 19:59 ac Calcium 23 1 mg/L 1 02/14/2023 15:00 ac EPA 200.7 02/14/2023 19:59 ac Magnesium 12 1 mg/L 1 02/14/2023 15:00 ac EPA 200.7 02/14/2023 19:59 ac Potassium 3 1 mg/L 1 02/14/2023 15:00 ac EPA 200.7 02/14/2023 19:59 ac Sodium 17 1 mg/L 1 02/14/2023 15:00 ac EPA 200.7 02/14/2023 19:59 ac Total Cations 3.0 --- meq/L 1 02/14/2023 15:00 ac EPA 200.7 02/14/2023 19:59 ac Boron ND 0.1 mg/L 1 J 02/14/2023 15:00 ac EPA 200.7 02/14/2023 19:59 ac Copper ND 10 ug/L 10002 1 J 02/14/2023 15:00 ac EPA 200.7 02/14/2023 19:59 ac Iron ND 30 ug/L 3002 1 J 02/14/2023 15:00 ac EPA 200.7 02/14/2023 19:59 ac Manganese ND 10 ug/L 502 1 U 02/14/2023 15:00 ac EPA 200.7 02/14/2023 19:59 ac Zinc ND 20 ug/L 1 J 02/14/2023 15:00 ac EPA 200.7 02/14/2023 19:59 ac SAR 0.7 0.1 1 02/14/2023 15:00 ac EPA 200.7 02/14/2023 19:59 ac Total Alkalinity(as CaCO3) 110 10 mg/L 1 02/19/2023 17:48 amm SM 4500-H+B 02/20/2023 02:00 amm Hydroxide as OH ND 10 mg/L 1 U 02/19/2023 17:48 amm SM 4500-H+B 02/20/2023 02:00 amm Carbonate as CO3 ND 10 mg/L 1 U 02/19/2023 17:48 amm SM 4500-H+B 02/20/2023 02:00 amm Bicarbonate as HCO3 140 10 mg/L 1 02/19/2023 17:48 amm SM 4500-H+B 02/20/2023 02:00 amm Sulfate 13.6 0.5 mg/L 5002 1 02/21/2023 17:51 Win EPA 300.0 02/21/2023 21:17 ldm Chloride 7 1 mg/L 5002 1 1 02/21/2023 17:51 ldm EPA 300.0 02/21/2023 21:17 ldm Nitrate as NO3 20.0 0.4 mg/L 45 1 02/14/2023 15:50 Ifs SM 4500-NO3 F 02/14/2023 16:20 Ifs Nitrite as N ND 0.2 mg/L 1 1 U 02/14/2023 15:50 Ifs SM 4500-NO3 F 02/14/2023 16:18 Ifs Nitrate+Nitrite as N 4.5 0.4 mg/L 10 1 02/14/2023 15:50 Ifs SM 4500-NO3 F 02/14/2023 16:20 Ifs Fluoride 0.2 0.1 mg/L 2 1 02/21/2023 17:51 ldm EPA 300.0 02/21/2023 21:17 ldm Total Anions 3.1 --- meq/L 1 1 02/19/2023 17:48 amm SM 4500-H+B 02/20/2023 02:00 amm pH 7.72 --- units 1 02/13/2023 09:30 ag 02/13/2023 09:30 ag Specific Conductance 293 1 umhos/cm 16002 1 02/19/2023 17:48 amm SM 4500-H+B 02/20/2023 02:00 amm Total Dissolved Solids 230 20 mg/L 10002 1 02/15/2023 11:45 ctl SM 2540 C 02/16/2023 12:15 ctl MBAS(foaming agents) Negative 0.1 mg/L 0.52 1 U 02/14/2023 17:37 jba SM 5540 C 02/14/2023 17:41 jba Aggressiveness Index 11.5 1 1 02/13/2023 09:30 ag 02/13/2023 09:30 ag Langelier Index(20°C) -0.3 1 1 02/13/2023 09:30 ag 02/13/2023 09:30 ag Nitrate Nitrogen 4.5 0.4 mg/L 10 1 02/14/2023 15:50 Ifs SM 4500-NO3 F 02/14/2023 16:20 Ifs 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. 1 The MS/MSD did not meet QC criteria. 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.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