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.O `AGRICULTURAL Analytical Chemists October 28, 2022 Lab No. : STK2254807-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Steven Shih Sampled On : October 13, 2022 at 14:31 1868 East Hazelton Ave. Sampled By : Aaron Goodenham Stockton, CA 95205 Received On : October 13, 2022 at 15:12 Description : Wellhead Matrix : Drinking Water Project 22331 Skiff Rd-WP0043555 Sample Results - Inorganic Sample AnalysisGeneral Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 65.4 2.5 mg/L 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 11:15 ac Calcium 13 1 mg/L 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 11:15 ac Magnesium 8 1 mg/L 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 11:15 ac Potassium 3 1 mg/L 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 11:15 ac Sodium 15 1 mg/L 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 11:15 ac Total Cations 2.0 --- meq/L 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 11:15 ac Boron ND 0.1 mg/L 1 J 10/18/2022 14:00 ac EPA 200.7 10/19/2022 11:15 ac Copper ND 10 ug/L 10002 1 J 10/18/2022 14:00 ac EPA 200.7 10/19/2022 11:15 ac Iron ND 30 ug/L 3002 1 J 10/18/2022 14:00 ac EPA 200.7 10/19/2022 11:15 ac Manganese ND 10 ug/L 502 1 U 10/18/2022 14:00 ac EPA 200.7 10/19/2022 11:15 ac Zinc ND 20 ug/L 1 J 10/18/2022 14:00 ac EPA 200.7 10/19/2022 11:15 ac SAR 0.8 0.1 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 11:15 ac Total Alkalinity(as CaCO3) 70 10 mg/L 1 10/22/2022 20:26 amm SM 4500-H+B 10/22/2022 21:24 amm Hydroxide as OH ND 10 mg/L 1 U 10/22/2022 20:26 amm SM 4500-H+B 10/22/2022 21:24 amm Carbonate as CO3 ND 10 mg/L 1 U 10/22/2022 20:26 amm SM 4500-H+B 10/22/2022 21:24 amm Bicarbonate as HCO3 90 10 mg/L 1 10/22/2022 20:26 amm SM 4500-H+B 10/22/2022 21:24 amm Sulfate 6.9 0.5 mg/L 5002 1 10/27/2022 15:01 Win EPA 300.0 10/27/2022 18:59 Idm Chloride 14 1 mg/L 5002 1 10/27/2022 15:01 Idm EPA 300.0 10/27/2022 18:59 Idm Nitrate as NO3 8.8 0.2 mg/L 45 1 10/14/2022 14:00 Ifs SM 4500-NO3 F 10/14/2022 15:48 Ifs Nitrite as N ND 0.2 mg/L 1 1 U 10/14/2022 14:00 Ifs SM 4500-NO3 F 10/14/2022 15:46 Ifs Nitrate+Nitrite as N 2.0 0.2 mg/L 10 1 10/14/2022 14:00 Ifs SM 4500-NO3 F 10/14/2022 15:48 Ifs Fluoride 0.2 0.1 mg/L 2 1 10/27/2022 15:01 Idm EPA 300.0 10/27/2022 18:59 Idm Total Anions 2.2 --- meq/L 1 10/22/2022 20:26 amm SM 4500-H+B 10/22/2022 21:24 amm pH 8.02 --- units 1 10/13/2022 14:31 ag 10/13/2022 14:31 ag Specific Conductance 220 1 umhos/cm 16002 1 10/22/2022 20:26 amm SM 4500-H+B 10/22/2022 21:24 amm Total Dissolved Solids 190 20 mg/L 10002 1 10/17/2022 11:09 ctl SM 2540 C 10/18/2022 11:28 ctl MBAS(foaming agents) Negative 0.1 mg/L 0.52 1 U 10/14/2022 16:53 jba SM 5540 C 10/14/2022 17:01 jba Aggressiveness Index 11.4 1 1 10/13/2022 14:31 ag 10/13/2022 14:31 ag Langelier Index(20°C) -0.4 1 1 10/13/2022 14:31 ag 10/13/2022 14:31 ag Nitrate Nitrogen 2.0 0.2 mg/L 10 1 10/14/2022 14:00 Ifs SM 4500-NO3 F 10/14/2022 15:48 Ifs 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. 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