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ENVIRONMENTAL <br /> • AGRICULTURAL <br /> Analytical Chemists <br /> July 16, 2026 <br /> Lab No. : STK2639741-001 <br /> San Joaquin Co. Environmental Health Dep Customer No.: 3017919 <br /> Description :Wellhead Matrix : Drinking Water <br /> Project :17423 S. Enterprise Rd., Escalon- Sampled On :July 1, 2026 at 09:20 <br /> WP0043558 <br /> Drinking Water Interpretations <br /> Summary: Your water was acceptable for all items tested on this sample report. Details are presented below: <br /> ComparedConstituent Result Units MCL Result <br /> Inorganic-Primary Less Than or Equal Exceeded <br /> Fluoride 0.2 mg/L 2 PASS <br /> Nitrate+Nitrite as N 4.3 mg/L 10 PASS <br /> Nitrate as NO3 18.9 mg/L 45 PASS <br /> Nitrate Nitrogen 4.3 mg/L 10 PASS <br /> Nitrite as N ND mg/L 1 PASS <br /> Zinc 40 ug/L 5000 PASS <br /> Inorganic-Secondary Less Than or Equal Exceeded <br /> Chloride 9 mg/L 500 PASS <br /> Copper 20 ug/L 1000 PASS <br /> Iron ND ug/L 300 PASS <br /> Manganese ND ug/L 50 PASS <br /> Specific Conductance 332 umhos/cm 1600 PASS <br /> Sulfate 9.8 mg/L 500 PASS <br /> Total Dissolved Solids 260 mg/L 1000 PASS <br /> Other Less Than or Equal Exceeded <br /> Copper 20 ug/L 1300** PASS <br /> Drinking Water Interpretations without MCL <br /> InterpretationConstituent Result Units Range <br /> Aggressiveness Index 11.1 --- 10 to 12 Moderately Aggressive. <br /> Water is undersaturated with respect to calcium carbonate. <br /> Langelier Index(20°C) -0.7 <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 /> Primary Items listed as primary are regulated because of health concerns. If there is a failure for a primary constituent <br /> treatment is normally required. <br /> Secondary Items listed as secondary are regulated because they may adversely affect the taste,odor or appearance of drinking <br /> water.They are not directly health related.If there is a failure for a secondary constituent on a small public water <br /> system it is best to consult your regulator to determine if treatment is required.A secondary constituent failure for a <br /> private water system does not require treatment. However,the owner may wish to treat the water in order to <br /> improve the quality. <br /> Section:Drinking Water Interpretations Page 4 of 8 Page 4 of 8 <br /> Corporate Offices&Laboratory Office&Laboratory Offlce&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 />