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ENVIRONMENTAS=- <br /> Analytical Chemists <br /> November 12, 2025 <br /> Lab No. : STK2556501-001 <br /> San Joaquin Co. Environmental Health Dep Customer No.: 3017919 <br /> Description : Wellhead Matrix : Drinking Water <br /> Project 266 Hewitt Road, Linden Sampled On : October 28, 2025 at 09:08 <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 Units MCL Result Compared <br /> Inorganic-Primary Less Than or Equal Exceeded <br /> Fluoride 0.1 mg/L 2 PASS <br /> Nitrate+Nitrite as N 1.0 mg/L 10 PASS <br /> Nitrate as NO3 4.4 mg/L 45 PASS <br /> Nitrate Nitrogen 1.0 mg/L 10 PASS <br /> Nitrite as N ND mg/L 1 PASS <br /> Zinc ND ug/L 5000 PASS <br /> Inorganic -Secondary Less Than or Equal Exceeded <br /> Chloride 6 mg/L 500 PASS <br /> Copper ND ug/L 1000 PASS <br /> Iron 270 ug/L 300 PASS <br /> Manganese 130 ug/L 50 FAIL <br /> Specific Conductance 235 umhos/cm 1600 PASS <br /> Sulfate 8.0 mg/L 500 PASS <br /> Total Dissolved Solids 190 m /L 1000 PASS <br /> Other Less Than or Equal Exceeded <br /> Copper ND u /L 1300** PASS <br /> Drinking Water Interpretations without MCL <br /> Constituent <br /> Aggressiveness Index 11.0 --- 10 to 12 Moderately Aggressive. <br /> Water is undersaturated with respect to calcium carbonate. <br /> Langelier Index(20°C) -0.9 <0 Undersaturated water has a tendency to remove existing calcium <br /> carbonate protective coatings in pipelines and equipment. <br /> Drinking Water Interpretations without MCL <br /> Constituent Result Units Range Interpretation <br /> Aggressiveness Index 11.0 10 to 12 Moderately Aggressive. <br /> Water is undersaturated with respect to calcium carbonate. <br /> Langelier Index(20°C) -0.9 <0 Undersaturated water has a tendency to remove existing calcium <br /> carbonate protective coatings in pipelines and equipment. <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:Drinking Water Interpretations Page 4 of 8 Paee 4 of 8 <br /> Corporate Offices&Laboratory Office&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 />