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.O `AGRICULTURAL Analytical Chemists August 12, 2022 Lab No. : STK2250321-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Steven Shih Sampled On :July 21, 2022 at 11:00 1868 East Hazelton Ave. Sampled By : Aaron Gooderham Stockton, CA 95205 Received On :July 21, 2022 at 14:25 Description : Wellhead Matrix : Drinking Water Project 23925 Highland Ave-WP0042302 Sample Results - Inorganic 91 _ • . General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 149 2.5 mg/L 1 07/29/2022 08:00 ac EPA 200.7 07/29/2022 16:08 ac Calcium 40 1 mg/L 1 07/29/2022 08:00 ac EPA 200.7 07/29/2022 16:08 ac Magnesium 12 1 mg/L 1 07/29/2022 08:00 ac EPA 200.7 07/29/2022 16:08 ac Potassium 5 1 mg/L 1 07/29/2022 08:00 ac EPA 200.7 07/29/2022 16:08 ac Sodium 51 1 mg/L 1 07/29/2022 08:00 ac EPA 200.7 07/29/2022 16:08 ac Total Cations 5.3 --- meq/L 1 07/29/2022 08:00 ac EPA 200.7 07/29/2022 16:08 ac Boron 0.1 0.1 mg/L 1 07/29/2022 08:00 ac EPA 200.7 07/29/2022 16:08 ac Copper ND 10 ug/L 10002 1 J 07/29/2022 08:00 ac EPA 200.7 07/29/2022 16:08 ac Iron ND 30 ug/L 3002 1 U 07/29/2022 08:00 ac EPA 200.7 07/29/2022 16:08 ac Manganese ND 10 ug/L 502 1 U 07/29/2022 08:00 ac EPA 200.7 07/29/2022 16:08 ac Zinc ND 20 ug/L 1 U 07/29/2022 08:00 ac EPA 200.7 08/01/2022 15:41 ac SAR 1.8 0.1 1 07/29/2022 08:00 ac EPA 200.7 07/29/2022 16:08 ac Total Alkalinity(as CaCO3) 130 10 mg/L 1 07/29/2022 23:15 amm SM 2320 B 07/30/2022 05:22 amm Hydroxide as OH ND 10 mg/L 1 U 07/29/2022 23:15 amm SM 2320 B 07/30/2022 05:22 amm Carbonate as CO3 ND 10 mg/L 1 U 07/29/2022 23:15 amm SM 2320 B 07/30/2022 05:22 amm Bicarbonate as HCO3 160 10 mg/L 1 07/29/2022 23:15 amm SM 2320 B 07/30/2022 05:22 amm Sulfate 52.2 0.5 mg/L 5002 1 1 07/22/2022 13:11 njb EPA 300.0 07/22/2022 16:56 mca Chloride 38 1 mg/L 5002 1 07/22/2022 13:11 njb EPA 300.0 07/22/2022 16:56 mca Nitrate as NO3 45.6 0.4 mg/L 45 1 07/22/2022 13:11 njb EPA 300.0 07/22/2022 16:56 mca Nitrite as N ND 0.1 mg/L 1 1 U 07/22/2022 13:11 njb EPA 300.0 07/22/2022 16:56 mca Nitrate+Nitrite as N 10.3 0.1 mg/L 10 1 07/22/2022 13:11 njb EPA 300.0 07/22/2022 16:56 mca Fluoride ND 0.1 mg/L 2 1 J 07/22/2022 13:11 njb EPA 300.0 07/22/2022 16:56 mca Total Anions 5.5 --- meq/L 1 1J 07/29/2022 23:15 amm SM 2320 B 07/30/2022 05:22 amm pH 7.35 --- units 1 07/21/2022 11:00 ag SM 4500-H+B 07/21/2022 11:00 ag Specific Conductance 575 1 umhos/cm 16002 1 07/26/2022 08:34 sta. SM 2510 B 07/26/2022 08:34 sta. Total Dissolved Solids 390 20 mg/L 10002 1 07/25/2022 11:15 ctl SM 2540 C 07/26/2022 09:19 ctl MBAS(foaming agents) Negative 0.1 mg/L 0.52 1 U 07/22/2022 14:48 jba SM 5540 C 07/22/2022 14:49 jba Aggressiveness Index 11.5 1 1 07/21/2022 11:00 ag SM 4500-H+B 07/21/2022 11:00 ag Langelier Index(20°C) -0.4 1 1 07/21/2022 11:00 ag SM 4500-H+B 07/21/2022 11:00 ag Nitrate Nitrogen 10.3 0.1 mg/L 10 1 07/22/2022 13:11 njb EPA 300.0 07/22/2022 16:56 mca 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. 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 8 Page 2 of 8 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