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.O `AGRICULTURAL Analytical Chemists October 28, 2022 Lab No. : STK2254925-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Steven Shih Sampled On : October 17, 2022 at 11:57 1868 East Hazelton Ave. Sampled By : Frank Giardi Stockton, CA 95205 Received On : October 17, 2022 at 12:33 Description : Wellhead Matrix : Drinking Water Project 1031 White Ln.,Stockton-WP0041099 Sample Results - Inorganic Sample AnalysisGeneral Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 128 2.5 mg/L 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 10:34 ac Calcium 30 1 mg/L 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 10:34 ac Magnesium 13 1 mg/L 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 10:34 ac Potassium 7 1 mg/L 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 10:34 ac Sodium 16 1 mg/L 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 10:34 ac Total Cations 3.4 --- meq/L 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 10:34 ac Boron ND 0.1 mg/L 1 U 10/18/2022 14:00 ac EPA 200.7 10/19/2022 10:34 ac Copper ND 10 ug/L 10002 1 J 10/18/2022 14:00 ac EPA 200.7 10/19/2022 10:34 ac Iron ND 30 ug/L 3002 1 J 10/18/2022 14:00 ac EPA 200.7 10/19/2022 10:34 ac Manganese 160 10 ug/L 502 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 10:34 ac Zinc ND 20 ug/L 1 J 10/18/2022 14:00 ac EPA 200.7 10/19/2022 10:34 ac SAR 0.6 0.1 1 10/18/2022 14:00 ac EPA 200.7 10/19/2022 10:34 ac Total Alkalinity(as CaCO3) 150 10 mg/L 1 10/23/2022 15:05 amm SM 4500-H+B 10/24/2022 00:25 amm Hydroxide as OH ND 10 mg/L 1 U 10/23/2022 15:05 amm SM 4500-H+B 10/24/2022 00:25 amm Carbonate as CO3 ND 10 mg/L 1 U 10/23/2022 15:05 amm SM 4500-H+B 10/24/2022 00:25 amm Bicarbonate as HCO3 180 10 mg/L 1 10/23/2022 15:05 amm SM 4500-H+B 10/24/2022 00:25 amm Sulfate 11.9 0.5 mg/L 5002 1 10/26/2022 11:37 ldm EPA 300.0 10/26/2022 14:05 ldm Chloride 13 1 mg/L 5002 1 10/26/2022 11:37 ldm EPA 300.0 10/26/2022 14:05 ldm Nitrate as NO3 12.2 0.9 mg/L 45 1 10/18/2022 12:30 Ifs SM 4500-NO3 F 10/18/2022 14:29 Ifs Nitrite as N ND 0.2 mg/L 1 1 U 10/18/2022 12:30 Ifs SM 4500-NO3 F 10/18/2022 14:27 Ifs Nitrate+Nitrite as N 2.8 0.2 mg/L 10 1 10/18/2022 12:30 Ifs SM 4500-NO3 F 10/18/2022 14:29 Ifs Fluoride ND 0.1 mg/L 2 1 J 10/26/2022 11:37 ldm EPA 300.0 10/26/2022 14:05 ldm Total Anions 3.8 --- meq/L 1 J 10/23/2022 15:05 amm SM 4500-H+B 10/24/2022 00:25 amm pH 6.55 --- units 1 10/17/2022 11:57 fg 10/17/2022 11:57 fg Specific Conductance 360 1 umhos/cm 16002 1 10/23/2022 15:05 amm SM 4500-H+B 10/24/2022 00:25 amm Total Dissolved Solids 230 20 mg/L 10002 1 10/18/2022 14:58 ctl SM 2540 C 10/19/2022 10:33 ctl MBAS(foaming agents) Negative 0.1 mg/L 0.52 1 U 10/18/2022 17:23 jba SM 5540 C 10/18/2022 17:32 jba Aggressiveness Index 10.6 1 1 10/17/2022 11:57 fg 10/17/2022 11:57 fg Langelier Index(20°C) -1.2 1 1 10/17/2022 11:57 fg 10/17/2022 11:57 fg Nitrate Nitrogen 2.8 0.2 mg/L 10 1 10/18/2022 12:30 Ifs SM 4500-NO3 F 10/18/2022 14:29 Ifs DQF Flags Definition: U Constituent results were non-detect. J Reported value is estimated;detected at a concentration below the PQL and above the laboratory MDL. 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