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.O `AGRICULTURAL Analytical Chemists October 14, 2022 Lab No. : STK2252817-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Steven Shih Sampled On : September 8, 2022 at 09:35 1868 East Hazelton Ave. Sampled By : Naseem Ahmed Stockton, CA 95205 Received On : September 8, 2022 at 10:15 Description Wellhead Matrix : Drinking Water Project : 1481 Manila Rd.,Lathrop-WP0042024 Sample Results - Inorganic 91 • .. General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 155 2.5 mg/L 1 10/13/2022 07:00 ac EPA 200.7 10/13/2022 07:14 ac Calcium 34 1 mg/L 1 10/13/2022 07:00 ac EPA 200.7 10/13/2022 07:14 ac Magnesium 17 1 mg/L 1 10/13/2022 07:00 ac EPA 200.7 10/13/2022 07:14 ac Potassium 1 1 mg/L 1 10/13/2022 07:00 ac EPA 200.7 10/13/2022 07:14 ac Sodium 545 5* mg/L 5 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:42 ac Total Cations 26.8 --- meq/L 1 10/13/2022 07:00 ac EPA 200.7 10/13/2022 07:14 ac Boron 0.6 0.1 mg/L 1 10/13/2022 07:00 ac EPA 200.7 10/13/2022 07:14 ac Copper 70 10 ug/L 10002 1 10/13/2022 07:00 ac EPA 200.7 10/13/2022 07:14 ac Iron ND 30 ug/L 3002 1 J 10/13/2022 07:00 ac EPA 200.7 10/13/2022 07:14 ac Manganese 230 10 ug/L 502 1 10/13/2022 07:00 ac EPA 200.7 10/13/2022 07:14 ac Zinc ND 20 ug/L 1 J 10/13/2022 07:00 ac EPA 200.7 10/13/2022 07:14 ac SAR 19.1 0.1 1 10/13/2022 07:00 ac EPA 200.7 10/13/2022 07:14 ac Total Alkalinity(as CaCO3) 350 10 mg/L 1 I 09/19/2022 15:10 amm SM 4500-H+B 09/19/2022 16:51 amm Hydroxide as OH ND 10 mg/L 1 U 09/19/2022 15:10 amm SM 4500-H+B 09/19/2022 16:51 amm Carbonate as CO3 ND 10 mg/L 1 U 09/19/2022 15:10 amm SM 4500-H+B 09/19/2022 16:51 amm Bicarbonate as HCO3 420 10 mg/L 1 09/19/2022 15:10 amm SM 4500-H+B 09/19/2022 16:51 amm Sulfate 165 0.5 mg/L 5002 1 09/09/2022 10:46 ldm EPA 300.0 09/09/2022 20:59 ldm Chloride 402 8* mg/L 5002 8 09/09/2022 10:46 ldm EPA 300.0 09/10/2022 14:09 ldm Nitrate as NO3 ND 0.4 mg/L 45 1 U 09/09/2022 10:46 ldm EPA 300.0 09/09/2022 20:59 ldm Nitrite as N ND 0.1 mg/L 1 1 U 09/09/2022 10:46 ldm EPA 300.0 09/09/2022 20:59 ldm Nitrate+Nitrite as N ND 0.1 mg/L 10 1 U 09/09/2022 10:46 ldm EPA 300.0 09/09/2022 20:59 ldm Fluoride 0.2 0.1 mg/L 2 1 09/09/2022 10:46 ldm EPA 300.0 09/09/2022 20:59 ldm Total Anions 21.7 --- meq/L 1 09/19/2022 15:10 amm SM 4500-H+B 09/19/2022 16:51 amm pH 6.08 --- units 1 09/08/2022 09:35 na SM 4500-H+B 09/08/2022 09:35 na Specific Conductance 2250 1 umhos/cm 16002 1 09/19/2022 15:10 amm SM 4500-H+B 09/19/2022 16:51 amm Total Dissolved Solids 1270 20 mg/L 10002 1 09/12/2022 10:39 ctl SM 2540 C 09/13/2022 11:27 ctl MBAS(foaming agents) Negative 0.1 mg/L 0.52 1 U 09/09/2022 17:01 jba SM 5540 C 09/09/2022 17:11 jba Aggressiveness Index 10.6 1 1 09/08/2022 09:35 na SM 4500-H+B 09/08/2022 09:35 na Langelier Index(20°C) -1.4 1 1 I 09/08/2022 09:35 na SM 4500-H+B 09/08/2022 09:35 na Nitrate Nitrogen ND 0.1 mg/L 10 1 U 09/09/2022 10:46 ldm EPA 300.0 09/09/2022 20:59 ldm DQF Flags Definition: J Reported value is estimated;detected at a concentration below the PQL and above the laboratory MDL. I The RPD for the laboratory duplicate exceeded laboratory criteria. U Constituent results were non-detect. ND=Non-Detected, RL=Reporting Level*RL adusted for dilution, 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