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ENVIRONMENTAL= Analytical Chemists September 22, 2021 Lab ID : STK2152566-001 Customer ID : 3-17919 San Joaquin Co. Environmental Health Dep Water Quality Division Sampled On : September 2, 2021-11:00 Attn: Michael Kith Sampled By : Aaron Goodenham 1868 East Hazelton Ave. Received On : September 2, 2021-11:35 Stockton, CA 95205 Matrix : Drinking Water Description : Wellhead Project : 1282 Corwin Dr Sample Result - Inorganic Constituent Result PQL Units MCL✓AL Sample Preparation Sample Analysis Method Date/ID Method Date/ID General Mineral otal Hardness as CaCO3 100 2.5 mg/L. 200.7 09/04/21:210236 200.7 09/06/21:213828 alcium 27 1 mgAL 200.7 09/04/21:210236 200.7 09/06/21:213828 Magnesium 8 1 mg/L 200.7 09/04/21:210236 200.7 09/06/21:213828 Potassium 3 1 mg/L 200.7 09/04/21:210236 200.7 09/06/21:213828 Sodium 29 1 mg/L 200.7 09/04/21:210236 200.7 09/06/21:213828 otal Cations 3.3 --- meq/L 200.7 09/04/21:210236 200.7 09/06/21:213828 Boron 0.2 0.1 mg/L 200.7 09/04/21:210236 200.7 09/04/21:213774 PP 2 C, er ND 10 ug/L 1000 200.7 09/04/21:210236 200.7 09/04/21:213774 Iron ND 30 ug/L 3002 200.7 09/04/21:210236 200.7 09/04/21:213774 Manganese ND 10 ug/L 502 200.7 09/04/21:210236 200.7 09/04/21:213774 Inc 20 20 ug/L 200.7 09/04/21:210236 200.7 09/04/21:213774 SAR 1.3 0.1 -- 200.7 09/04/21:210236 200.7 09/06/21:213828 Total Alkalinity(as CaCO3) 120 10 mg/L 2320B 09/14/21:210651 2320B 09/15/2L214400 Hydroxide as OH ND 10 mg/L 2320B 09/14/21:210651 2320B 09/15/21:214400 Carbonate as CO3 ND 10 mg/L 2320B 09/14/21:210651 2320B 09/15/21:214400 Bicarbonate as HCO3 140 10 mg/L 2320E 09/14/21:210651 23208 09/15/21:214400 Sulfate 12.9 0.5 mg/L 5002 300.0 09/03/21:210232 300.0 09/03/21:213977 Chloride 8 1 mg/L 5002 300.0 09/03/21:210232 300.0 09/03/21:213977 Nitrate as NO3 16.2 0.4 mg/L 45 300.0 09/03/21:210232 300.0 09/03/21:213977 Nitrite as N ND 0.2 mg/L 1 300.0 09/03/21:210232 300.0 09/03/21:213977 Nitrate+Nitrite as N 3.7 0.1 mg/L 10 300.0 09/03/21:210232 300.0 09/03/21:213977 Fluoride 0.1 0.1 mg/L 2 300.0 09/03/21:210232 300.0 09/03/21:213977 Total Anions 3.1 --- meq/L 2320B 09/14/21:210651 2320B 09/15/21:214400 pH(Field) 7.68 --- units 4500-H B 09/02/21:210263 4500HB 09/02/21:213804 Specific Conductance 314 1 umhos/cm 16002 25108 09/14/21:210625 2510B 09/14/21:214274 Total Dissolved Solids 230 20 mg/L 10002 2540CE 09/07/21:210269 2540C 09/08/21:213933 MBAS Extraction ND 0.1 mg/L, 0.52 5540C 09/03/21:210315 5540C 09/03/21:213884 Aggressiveness Index 11.6 1 -- 4500-H B 09/02/21:210263 4500HB 09/02/21:213804 Langelier Index(20°C) -0.2 1 -- 4500-H B 09/02/21:210263 4500HB 09/02/21:213804 Nitrate Nitrogen 1 3.7 0.1 mg/L 10 300.0 09/03/21:210232 300.0 09/03/21:213977 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 10 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 Cartifiration Nn 9n70 r,n Fi AP r A of AM