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RM- .O AGRICULTUKAL Analytical Chemists July 16, 2026 Lab No. : STK2639742-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On :July 1, 2026 at 09:00 1868 East Hazelton Ave. Sampled By : Rena LeRoy Stockton, CA 95205 Received On :July 1, 2026 at 09:55 Description :Wellhead Matrix : Drinking Water Project :700 Yosemite Ave., Escalon- WP0044134 Sample Results - Inorganic Sample AriaIN7sis General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 245 2.5 mg/L 07/06/2026 08:00 ac 2340B 07/06/2026 13:37 ac Calcium 52 1 mg/L 1 07/06/2026 08:00 ac EPA 200.7 07/06/2026 13:37 ac Magnesium 28 1 mg/L 1 07/06/2026 08:00 ac EPA 200.7 07/06/2026 13:37 ac Potassium 4 1 mg/L 1 07/06/2026 08:00 ac EPA 200.7 07/06/2026 13:37 ac Sodium 27 1 mg/L 1 07/06/2026 08:00 ac EPA 200.7 07/06/2026 13:37 ac Total Cations 6.2 meq/L 07/06/2026 08:00 ac Calc. 07/06/2026 13:37 ac Boron ND 0.1 mg/L 1 U 07/06/2026 08:00 ac EPA 200.7 07/06/2026 13:37 ac Copper ND 10 ug/L 1000, 1 U 07/06/2026 08:00 ac EPA 200.7 07/06/2026 13:37 ac Iron ND 30 ug/L 3001 1 U 07/06/2026 08:00 ac EPA 200.7 07/06/2026 13:37 ac Manganese ND 10 ug/L 50' 1 U 07/06/2026 08:00 ac EPA 200.7 07/06/2026 13:37 ac Zinc ND 20 ug/L 5000 1 U 07/06/2026 08:00 ac EPA 200.7 07/06/2026 13:37 ac SAR 0.8 07/06/2026 08:00 ac Cale. 07/06/2026 13:37 ac Total Alkalinity(as CaCO3) 230 10 mg/L 1 07/06/2026 13:53 amm SM 4500-H+B 07/06/2026 22:39 amm Hydroxide as OH ND 10 mg/L 1 U 07/06/2026 13:53 amm SM 4500-H+B 07/06/2026 22:39 amm Carbonate as CO3 ND 10 mg/L 1 U 07/06/2026 13:53 amm SM 4500-H+B 07/06/2026 22:39 amm Bicarbonate as HCO3 280 10 mg/L 1 07/06/2026 13:53 amm SM 4500-H+B 07/06/2026 22:39 amm Sulfate 25.9 0.5 mg/L 5002 1 b 07/08/2026 09:29 ldm EPA 300.0 07/08/2026 16:29 Min Chloride 15 1 mg/L 500' 1 b 07/08/2026 09:29 ldm EPA 300.0 07/08/2026 16:29 ldm Nitrate as NO3 41.5 0.4 mg/L 45 1 07/02/2026 13:30 mmi SM 4500-NO3 F 07/02/2026 14:27 mml Nitrite as N ND 0.2 mg/L 1 1 U 07/02/2026 13:30 mml. SM 4500-NO3 F 07/02/2026 14:25 mml Nitrate+Nitrite as N 9.4 0.4 mg/L 10 1 07/02/2026 13:30 mml SM 4500-NO3 F 07/02/2026 14:27 mml Fluoride 0.1 0.1 mg/L 2 1 07/08/2026 09:29 ldm EPA 300.0 07/08/2026 16:29 ldm Total Anions 6.2 - meq/L 07/08/2026 09:29 ldm Calc. 07/08/2026 16:29 ldm pH 7.4 --- units 1 07/01/2026 09:00 rl SM 4500-H+B 07/01/2026 09:00 rl Specific Conductance 585 1 umhos/cm 16002 1 07/06/2026 13:53 amm SM 4500-H+B 07/06/2026 22:39 amm Total Dissolved Solids 390 20 mg/L 1000, 1 07/06/2026 13:30 ctl SM 2540 C 07/07/2026 10:30 ctl MBAs(Screen) Negative 0.1 mg/L 1 U 07/02/2026 19:10 mct SM 5540 C 07/02/2026 19:18 mct Aggressiveness Index 11.9 10 --- 07/06/2026 08:00 ac Calc. 07/06/2026 13:37 ac Langeher Index(20°C) 0.02 20 --- 07/06/2026 08:00 ac Calc. 07/06/2026 13:37 ac Nitrate Nitrogen 9.4 0.4 mg/L 10 1 07/02/2026 13:30 mml SM 4500-NO3 F 07/02/2026 14:27 mml DQF Flags Definition: U Constituent results were non-detect. b The Blank was positive for constituent but less than the PQL 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.Lindo Avenue 3442 Empress Drive,Suite D 9411 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 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