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November 12, 2025 <br />San Joaquin Co. Environmental Health Dep <br />Water Quality Division <br />Attn: Scott Sanglaang <br />1868 East Hazelton Ave. <br />Stockton, CA 95205 <br />Description :Well Head <br />Project :12757 E Whitehouse Road <br />Stockton/WP2500952 <br />Sample Results - Inorganic <br />Lab No. : STK2556626-001 <br />Customer No.: 3017919 <br />Sampled On : October 27, 2025 at 14:11 <br />Sampled By : Sastina Thammavongsa <br />Received On : October 27, 2025 at 14:30 <br />Matrix : Drinking Water <br />General Mineral <br />Date <br />Time <br />Who <br />Method <br />Date <br />Time <br />Who <br />Total Hardness as CaCO3 <br />68.7 <br />2.5 <br />mg/L <br />10/28/2025 <br />13:40 <br />ac <br />2340B <br />10/28/2025 <br />21:47 <br />ac <br />Calcium <br />16 <br />1 <br />mg/L <br />1 <br />10/28/2025 <br />13:40 <br />ac <br />EPA 200.7 <br />10/28/2025 <br />21:47 <br />ac <br />Magnesium <br />7 <br />1 <br />mg/L <br />1 <br />10/28/2025 <br />13:40 <br />ac <br />EPA 200.7 <br />10/28/2025 <br />21:47 <br />ac <br />Potassium <br />5 <br />1 <br />mg/L <br />1 <br />10/28/2025 <br />13:40 <br />ac <br />EPA 200.7 <br />10/28/2025 <br />21:47 <br />ac <br />Sodium <br />16 <br />1 <br />mg/L <br />1 <br />10/28/2025 <br />13:40 <br />ac <br />EPA 200.7 <br />10/28/2025 <br />21:47 <br />ac <br />Total Cations <br />2.2 <br />1 <br />meq/L <br />10/28/2025 <br />13:40 <br />ac <br />Calc. <br />10/28/2025 <br />21:47 <br />ac <br />Boron <br />ND <br />0.1 <br />mg/L <br />1 <br />U <br />10/28/2025 <br />13:40 <br />ac <br />EPA 200.7 <br />10/28/2025 <br />21:47 <br />ac <br />Copper <br />ND <br />10 <br />ug/L <br />1000, <br />1 <br />Ul <br />10/28/2025 <br />13:40 <br />ac <br />EPA 200.7 <br />10/28/2025 <br />21:47 <br />ac <br />Iron <br />ND <br />30 <br />ug/L <br />3002 <br />1 <br />Ul <br />10/28/2025 <br />13:40 <br />ac <br />EPA 200.7 <br />10/28/2025 <br />21:47 <br />ac <br />Manganese <br />ND <br />10 <br />ug/L <br />501 <br />1 <br />U <br />10/28/2025 <br />13:40 <br />ac <br />EPA 200.7 <br />10/28/2025 <br />21:47 <br />ac <br />Zinc <br />40 <br />20 <br />ug/L <br />5000 <br />1 <br />10/28/2025 <br />13:40 <br />ac <br />EPA 200.7 <br />10/28/2025 <br />21:47 <br />ac <br />SAR <br />0.8 <br />10/28/2025 <br />13:40 <br />ac <br />Calc. <br />10/28/2025 <br />21:47 <br />ac <br />Total Alkalinity (as CaCO3) <br />100 <br />10 <br />mg/L <br />1 <br />10/29/2025 <br />14:10 <br />amm <br />SM 4500-H+B <br />10/29/2025 <br />22:51 <br />amm <br />Hydroxide as OH <br />ND <br />10 <br />mg/L <br />1 <br />U <br />10/29/2025 <br />14:10 <br />amm <br />SM 4500-H+B <br />10/29/2025 <br />22:51 <br />amm <br />Carbonate as CO3 <br />ND <br />10 <br />mg/L <br />1 <br />U <br />10/29/2025 <br />14:10 <br />amm <br />SM 4500-H+B <br />10/29/2025 <br />22:51 <br />amm <br />Bicarbonate as HCO3 <br />120 <br />10 <br />mg/L <br />1 <br />10/29/2025 <br />14:10 <br />amm <br />SM 4500-H+B <br />10/29/2025 <br />22:51 <br />amm <br />Sulfate <br />5.0 <br />0.5 <br />mg/L <br />5001 <br />1 <br />11/04/2025 <br />12:40 <br />ldm <br />EPA 300.0 <br />11/05/2025 <br />00:43 <br />ldm <br />Chloride <br />6 <br />1 <br />mg/L <br />5002 <br />1. <br />11/04/2025 <br />12:40 <br />ldm <br />EPA 300.0 <br />11/05/2025 <br />00:43 <br />ldm <br />Nitrate as NO3 <br />3.3 <br />0.4 <br />mg/L <br />45 <br />1 <br />10/28/2025 <br />11:30 <br />mml <br />SM 4500-NO3 F <br />10/28/2025 <br />12:22 <br />mml <br />Nitrite as N <br />ND <br />0.2 <br />mg/L <br />1 <br />1 <br />U <br />10/28/2025 <br />11:30 <br />mml <br />SM 4500-NO3 F <br />10/28/2025 <br />12:20 <br />mml <br />Nitrate + Nitrite as N <br />0.8 <br />0.4 <br />mg/L <br />10 <br />1 <br />10/28/2025 <br />11:30 <br />mml <br />SM 4500-NO3 F <br />10/28/2025 <br />12:22 <br />rami <br />Fluoride <br />0.1 <br />0.1 <br />mg/L <br />2 <br />1 <br />11/04/2025 <br />12:40 <br />ldm <br />EPA 300.0 <br />11/05/2025 <br />00:43 <br />ldm <br />Total Anions <br />2.3 <br />10 <br />meq/L <br />11/04/2025 <br />12:40 <br />ldm <br />Calc. <br />11/05/2025 <br />00:43 <br />ldm <br />pH <br />8.3 <br />-- <br />units <br />1 <br />10/27/2025 <br />14:11 <br />st <br />SM 4500-H+B <br />10/27/2025 <br />14:11 <br />st <br />Specific Conductance <br />221 <br />1 <br />umhos/cm <br />16001 <br />1 <br />10/29/2025 <br />14:10 <br />amm <br />SM 4500-H+B <br />10/29/2025 <br />22:51 <br />amm <br />Total Dissolved Solids <br />190 <br />20 <br />mg/L <br />10001 <br />1 <br />10/29/2025 <br />10:00 <br />ctl <br />SM 2540 C <br />10/30/2025 <br />11:15 <br />ctl <br />MBAs (Screen) <br />Negative <br />0.1 <br />mg/L <br />1 <br />U <br />10/28/2025 <br />18:50 <br />mct <br />SM 5540 C <br />10/28/2025 <br />19:05 <br />met <br />Aggressiveness Index <br />11.9 <br />10 <br />--- <br />10/28/2025 <br />13:40 <br />ac <br />Calc. <br />10/28/2025 <br />21:47 <br />ac <br />Langeher Index (20°C) <br />0.09 <br />20 <br />--- <br />10/28/2025 <br />13:40 <br />ac <br />Calc. <br />10/28/2025 <br />21:47 <br />ac <br />Nitrate Nitrogen <br />0.8 <br />0.4 <br />mg/L <br />10 <br />1 <br />10/28/2025 <br />11:30 <br />mml <br />SM 4500-NO3 F <br />10/28/2025 <br />12:22 <br />mml <br />DQF Flags Definition: <br />U Constituent results were non -detect. <br />1 The MS/MSD did not meet QC criteria. <br />ND=Non-Detected, RL=Reporting Level, Dil.=Dilution <br />MCL = Maximum Contamination Level. 2 - Secondary Standard. 3 - CDPH Notification Level. AL = Regulatory Action Level. <br />Section: Sample Results Page 2 of 8 Page 2 of 8 <br />Corporate Offices & Laboratory Office & Laboratory Offlce & Laboratory <br />853 Corporation Street 2500 Stagecoach Road 563 E. Undo Avenue <br />Santa Paula, CA 93060 Stockton, CA 95215 Chico, CA 95926 <br />TEL: (805)392-2000 TEL: (209)942-0182 TEL: (530)343-5818 <br />CA ELAP Certification No. 1573 CA ELAP Certification No. 1563 CA ELAP Certification No. 2670 <br />Office & Laboratory <br />3442 Empresa Drive, Suite D <br />San Luis Obispo, CA 93401 <br />TEL: (805)783-2940 <br />CA ELAP Certification No. 2775 <br />Office & Laboratory <br />9411 W. Goshen Avenue <br />Visalia, CA 93291 <br />TEL: (559)734-9473 <br />CA ELAP Certification No. 2810 <br />