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ENVIR0NMENTA AGRICULTURAL Analytical Chemists January 20, 2026 Lab No. : STK2630257-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On :January 7, 2026 at 09:17 1868 East Hazelton Ave. Sampled By : Rena-Lerey Stockton, CA 95205 Received On :January 7, 2026 at 10:06 Description :Well Head Matrix : Drinking Water Project :15124 Jelly Bean lane Oakdale, Ca /Ap2502315 Sample Results - Inorganic General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 154 2.5 mg/L 01/09/2026 10:00 ac 2340B 01/09/2026 13:46 ac Calcium 32 1 mg/L 1 01/09/2026 10:00 ac EPA 200.7 01/09/2026 13:46 ac Magnesium 18 1 mg/L 1 01/09/2026 10:00 ac EPA 200.7 01/09/2026 13:46 ac Potassium 3 1 mg/L 1 01/09/2026 10:00 ac EPA 200.7 01/09/2026 13:46 ac Sodium 23 1 mg/L 1 01/09/2026 10:00 ac EPA 200.7 01/09/2026 13:46 ac Total Cations 4.2 meq/L 01/09/2026 10:00 ac Calc. 01/09/2026 13:46 ac Boron ND 0.1 mg/L 1 U 01/09/2026 10:00 ac EPA 200.7 01/09/2026 13:46 ac Copper 20 10 ug/L 1000' 1 01/09/2026 10:00 ac EPA 200.7 01/09/2026 13:46 ac Iron ND 30 ug/L 300' 1 U 01/09/2026 10:00 ac EPA 200.7 01/09/2026 13:46 ac Manganese ND 10 ug/L 50' 1 U 01/09/2026 10:00 ac EPA 200.7 01/09/2026 13:46 ac Zinc 2850 20 ug/L 5000 1 01/09/2026 10:00 ac EPA 200.7 01/09/2026 13:46 ac SAR 0.8 01/09/2026 10:00 ac Calc. 01/09/2026 13:46 ac Total Alkalinity(as CaCO3) 170 10 mg/L 1 01/12/2026 15:22 amen SM 4500-H+B 01/12/2026 20:17 amm Hydroxide as OH ND 10 mg/L 1 U 01/12/2026 15:22 amm SM 4500-H+B 01/12/2026 20:17 amm Carbonate as CO3 ND 10 mg/L 1 U 01/12/2026 15:22 amm SM 4500-H+B 01/12/2026 20:17 amm Bicarbonate as HCO3 210 10 mg/L 1 01/12/2026 15:22 amm SM 4500-H+B 01/12/2026 20:17 amm Sulfate 12.0 0.5 mg/L 500' 1 b 01/12/2026 09:10 ldm EPA 300.0 01/13/2026 00:41 ldm Chloride 13 1 mg/L 500' 1 b 01/12/2026 09:10 ldm EPA 300.0 01/13/2026 00:41 ldm Nitrate as NO3 10.0 0.4 mg/L 45 1 01/08/2026 14:15 mmi SM 4500-NO3 F 01/08/2026 15:34 mml Nitrite as N ND 0.2 mg/L 1 1 U 01/08/2026 14:15 mml SM 4500-NO3 F 01/08/2026 15:32 mml Nitrate+Nitrite as N 2.3 0.4 mg/L 10 1 01/08/2026 14:15 mml SM 4500-NO3 F 01/08/2026 15:34 mml Fluoride 0.1 0.1 mg/L 2 1 01/12/2026 09:10 ldm EPA 300.0 01/13/2026 00:41 ldm Total Anions 4.2 meq/L 01/12/2026 09:10 ldm Calc. 01/13/2026 00:41 ldm pH 2.3 --- units 1 01/07/2026 09:17 r-1 SM 4500-H+B 01/07/2026 09:17 r-1 Specific Conductance 400 1 umhos/cm 1600' 1 01/12/2026 15:22 amm SM 4500-H+B 01/12/2026 20:17 amm Total Dissolved Solids 270 20 mg/L 1000' 1 01/09/2026 13:45 ctl SM 2540 C 01/12/2026 11:30 ctl MBAs(Screen) Negative 0.1 mg/L 1 U 01/08/2026 20:22 mct SM 5540 C 01/08/2026 20:29 mct Aggressiveness Index 6.4 10 --- 01/09/2026 10:00 ac Calc. 01/09/2026 13:46 ac Langelier Index(20'C) -5.4 20 --- 01/09/2026 10:00 ac Calc. 01/09/2026 13:46 ac Nitrate Nitrogen 2.3 0.4 mg/L 10 1 01/08/2026 14:15 mml SM 4500-NO3 F 01/08/2026 15:34 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.Undo Avenue 3442 Empresa 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