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ENVIRONMENTAINW. . , Analytical Chemists May 31, 2022 Lab ID : STK2236202-001 Customer ID : 3-17919 San Joaquin Co. Environmental Health Dep Water Quality Division Sampled On : May 4, 2022-10:30 Attn: Steven Shih Sampled By : Aaron Gooderham 1868 East Hazelton Ave. Received On : May 4, 2022-15:00 Stockton, CA 95205 Matrix : Drinking Water Description : Wellhead Project : 14557 Leroy Ave Sample Result-Inorganic Constituent Result PQL Units MCL/AL Sample Preparation Sample Analysis Method Date/ID Method Date/ID General Mineral Total Hardness as CaCO3 74.6 2.5 mg/L 200.7 05/10/22:205156 200.7 05/10/22:206735 Calcium 20 1 mg/L 200.7 05/10/22:205156 200.7 05/10/22:206735 Magnesium 6 1 mg/L 200.7 05/10/22:205156 200.7 05/10/22:206735 Potassium 4 1 mg/L 200.7 05/10/22:205156 200.7 05/10/22:206735 Sodium 17 1 mg/L 200.7 05/10/22:205156 200.7 05/10/22:206735 Total Cations 2.3 --- meq/L 200.7 05/10/22:205156 200.7 05/10/22:206735 Boron 0.1 0.1 mg/L 200.7 05/10/22:205156 200.7 05/10/22:206735 Copper ND 10 ug/L 10002 200.7 05/10/22:205156 200.7 05/10/22:206735 Iron 30 30 ug/L 3002 200.7 05/10/22:205156 200.7 05/10/22:206735 anganese ND 10 ug/L 502 200.7 05/10/22:205156 200.7 05/10/22:206735 Inc ND 20 ug/L 200.7 05/10/22:205156 200.7 05/10/22:206735 SAR 0.9 0.1 -- 200.7 05/10/22:205156 200.7 05/10/22:206735 Total Alkalinity(as CaCO3) 80 10 mg/L 2320B 05/16/22:205346 2320B 05/16/22:207015 Hydroxide as OH ND 10 mg/L 2320B 05/16/22:205346 2320B 05/16/22:207015 Carbonate as CO3 ND 10 mg/L 2320B 05/16/22:205346 2320B 05/16/22:207015 Bicarbonate as HCO3 100 10 mg/L 2320B 05/16/22:205346 2320B 05/16/22:207015 Sulfate 7.6 0.5 mg/L 5002 300.0 05/18/22:205495 300.0 05/18/22:207306 Chloride 12 1 mg/L 5002 300.0 05/18/22:205495 300.0 05/18/22:207306 Nitrate as NO3 10.8 0.4 mg/L 45 300.0 05/18/22:205495 300.0 05/18/22:207306 itrite as N ND 0.1 mg/L 1 300.0 05/18/22:205495 300.0 05/18/22:207306 Nitrate+Nitrite as N 2.4 0.1 mg/L 10 300.0 05/18/22:205495 300.0 05/18/22:207306 Fluoride 0.1 0.1 mg/L 2 300.0 05/18/22:205495 300.0 05/18/22:207306 Total Anions 2.3 --- meq/L 2320B 05/16/22:205346 2320B 05/16/22:207015 H(Field) 7.56 --- units 4500-H B 05/04/22:205074 4500HB 05/04/22:206568 Specific Conductance 254 1 umhos/cm 16002 2510B 05/17/22:205416 2510B 05/17/22:207022 Total Dissolved Solids 210 20 mg/L 10002 2540CE 05/09/22:205085 2540C 05/10/22:206670 BAS Screen Negative 0.1 mg/L 0.52 5540C 05/06/22:205089 5540C 05/06/22:206593 Aggressiveness Index 11.2 1 -- 4500-H B 05/04/22:205074 4500HB 05/04/22:206568 angelier Index(20°C) -0.7 1 -- 4500-H B 05/04/22:205074 4500HB 05/04/22:206568 itrate Nitrogen 2.4 0.1 mg/L 10 300.0 05/18/22:205495 300.0 05/18/22:207306 ND=Non-Detected.PQL=Practical Quantitation Limit.*PQL adjusted for dilution. MCL=Maximum Contamination Level.2-Secondary Standard.3-CDPH Notification Level.AL=Regulatory Action Level. Page 3 of 9 Corporate Offices&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory 853 Corporation Street 2500 Stagecoach Road 563 E.Lindo Avenue 3442 Empresa Drive,Suite D 9415 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 Env FAX:(805)525-4172/Ag FAX:(805)392-2063 FAX:(209)942-0423 FAX:(530)343-3807 FAX:(805)783-2912 FAX:(559)734-8435 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