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.O `AGRICULTURAL Analytical Chemists November 16, 2022 Lab No. : STK2255037-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Steven Shih Sampled On : October 18, 2022 at 11:39 1868 East Hazelton Ave. Sampled By : Frank Giardi Stockton, CA 95205 Received On : October 18, 2022 at 12:10 Description : Wellhead Matrix : Drinking Water Project 2224 Beyer Rd.,STK-WP0041388 Sample Results - Inorganic 91 _ • . General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 169 2.5 mg/L 1 10/20/2022 11:00 ac EPA 200.7 10/21/2022 12:31 ac Calcium 38 1 mg/L 1 10/20/2022 11:00 ac EPA 200.7 10/21/2022 12:31 ac Magnesium 18 1 mg/L 1 10/20/2022 11:00 ac EPA 200.7 10/23/2022 11:08 ac Potassium 8 1 mg/L 1 10/20/2022 11:00 ac EPA 200.7 10/21/2022 12:31 ac Sodium 16 1 mg/L 1 10/20/2022 11:00 ac EPA 200.7 10/21/2022 12:31 ac Total Cations 4.3 --- meq/L 1 10/20/2022 11:00 ac EPA 200.7 10/21/2022 12:31 ac Boron ND 0.1 mg/L 1 U 10/20/2022 11:00 ac EPA 200.7 10/21/2022 12:31 ac Copper ND 10 ug/L 10002 1 J 10/20/2022 11:00 ac EPA 200.7 10/21/2022 12:31 ac Iron 60 30 ug/L 3002 1 10/20/2022 11:00 ac EPA 200.7 10/23/2022 11:08 ac Manganese ND 10 ug/L 502 1 U 10/20/2022 11:00 ac EPA 200.7 10/21/2022 12:31 ac Zinc ND 20 ug/L 1 J 10/20/2022 11:00 ac EPA 200.7 10/21/2022 12:31 ac SAR 0.5 0.1 1 10/20/2022 11:00 ac EPA 200.7 10/21/2022 12:31 ac Total Alkalinity(as CaCO3) 170 10 mg/L 1 10/21/2022 14:30 sta. SM 4500-H+B 10/21/2022 23:42 amm Hydroxide as OH ND 10 mg/L 1 U 10/21/2022 14:30 sta. SM 4500-H+B 10/21/2022 23:42 amm Carbonate as CO3 ND 10 mg/L 1 U 10/21/2022 14:30 sta. SM 4500-H+B 10/21/2022 23:42 amm Bicarbonate as HCO3 210 10 mg/L 1 10/21/2022 14:30 sta. SM 4500-H+B 10/21/2022 23:42 amm Sulfate 15.6 0.5 mg/L 5002 1 11/14/2022 12:45 ldm EPA 300.0 11/14/2022 22:52 ldm Chloride 17 1 mg/L 5002 1 1 10/19/2022 10:22 ldm EPA 300.0 10/20/2022 04:53 ldm Nitrate as NO3 15.4 0.4 mg/L 45 1 1 10/19/2022 10:22 ldm EPA 300.0 10/20/2022 04:53 ldm Nitrite as N ND 0.1 mg/L 1 1 U 10/19/2022 10:22 ldm EPA 300.0 10/20/2022 04:53 ldm Nitrate+Nitrite as N 3.5 0.1 mg/L 10 1 1 10/19/2022 10:22 ldm EPA 300.0 10/20/2022 04:53 ldm Fluoride ND 0.1 mg/L 2 1 Jh 10/19/2022 10:22 ldm EPA 300.0 10/20/2022 04:53 ldm Total Anions 4.5 --- meq/L 1 1Jh 10/21/2022 14:30 sta. SM 4500-H+B 10/21/2022 23:42 amm pH 8.1 units 1 T 10/21/2022 14:30 sta. SM 4500-H+B 10/21/2022 23:42 amm Specific Conductance 421 1 umhos/cm 16002 1 10/21/2022 14:30 sta. SM 4500-H+B 10/21/2022 23:42 amm Total Dissolved Solids 270 20 mg/L 10002 1 10/20/2022 13:53 ctl SM 2540 C 10/21/2022 11:03 ctl MBAS(foaming agents) Negative 0.1 mg/L 0.52 1 U 10/19/2022 13:35 jba SM 5540 C 10/19/2022 13:47 jba Aggressiveness Index 12.3 1 1 10/21/2022 14:30 sta. SM 4500-H+B 10/21/2022 23:42 amm Langelier Index(20°C) 0.5 1 1 10/21/2022 14:30 sta. SM 4500-H+B 10/21/2022 23:42 amm Nitrate Nitrogen 3.5 0.1 mg/L 10 1 1 10/19/2022 10:22 ldm EPA 300.0 10/20/2022 04:53 ldm 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. 1 The MS/MSD did not meet QC criteria. h 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