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tin <br /> ENVIRONMENTAt:,z�a—a�a7,�'AGRICULTURAL <br /> Analytical Chemists <br /> December 17, 2025 <br /> Lab No. : STK2558392-001 <br /> San Joaquin Co. Environmental Health Dep Customer No.: 3017919 <br /> Description :Well Head Matrix : Drinking Water <br /> Project :7806 S. Borba Road Stockton Sampled On : December 3, 2025 at 08:14/ <br /> WP0042779 <br /> Drinking Water Interpretations <br /> Summary: Your water has a failure to meet maximum contaminant levels (MCLs) for one or more items on <br /> this sample report. Please see the table below to determine which items failed. Following the table is a brief <br /> explanation describing the significance of the failure and whether treatment may be required. <br /> Constituent Result Units MCL Result Compared to <br /> MCL <br /> Inorganic -Primary Less Than or Equal Exceeded <br /> Fluoride 0.4 mg/L 2 PASS <br /> Nitrate+Nitrite as N 5.4 mg/L 10 PASS <br /> Nitrate as NO3 24.0 mg/L 45 PASS <br /> Nitrate Nitrogen 5.4 mg/L 10 PASS <br /> Nitrite as N ND mg/L 1 PASS <br /> Zinc ND u /L 5000 PASS <br /> Inorganic- Secondary Less Than or Equal Exceeded <br /> Chloride 200 mg/L 500 PASS <br /> Copper ND ug/L 1000 PASS <br /> Iron ND ug/L 300 PASS <br /> Manganese 130 ug/L• 50 FAIL <br /> Specific Conductance 1220 umhos/cm 1600 PASS <br /> Sulfate 98.7 mg/L 500 PASS <br /> Total Dissolved Solids 680 mg/L 1000 PASS <br /> Other Less Than or Equal Exceeded <br /> Copper ND ug/L 1300** PASS <br /> Drinking Water Interpretations without MCL <br /> Constituent Result Units Range Interpretation <br /> Aggressiveness Index 12.0 --- 10 to 12 IModerately Aggressive. <br /> Langelier Index(20°C) 0.2 ___ >0 Water is supersaturated with respect to calcium carbonate <br /> (CaCO3)and scale forming may occur. <br /> Drinking Water Interpretations without MCL <br /> Constituent <br /> Aggressiveness Index 12.0 --- 10 to 12 11Moderately Aggressive. <br /> Langelier Index(20°C) 0.2 >0 Water is supersaturated with respect to calcium carbonate <br /> (CaCO3)and scale forming may occur. <br /> ND=Non-Detect <br /> Definitions <br /> MCL The maximum level at which a constituent may be present and be considered acceptable for potability or aesthetics. <br /> Section:Drinldng Water Interpretations Page 4 of 8 Page 4 of A <br /> Corporate Offices&Laboratory Offce&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory <br /> 853 Corporation Street 2500 Stagecoach Road 563 E.Lindo Avenue 3442 Empresa Drive,Suite D 9411 W.Goshen Avenue <br /> Santa Paula,CA 93060 Stockton,CA 95215 Chico,CA 95926 San Luis Obispo,CA 93401 Visalia,CA 93291 <br /> TEL:(805)392-2000 TEL:(209)942-0182 TEL:(530)343-5818 TEL:(805)783-2940 TEL:(559)734-9473 <br /> 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 <br />