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ENVIRONMENTAL . . Analytical Chemists August 25, 2021 Lab ID : STK2150746-001 Customer ID : 3-17919 San Joaquin Co.Environmental Health Dep Water Quality Division Sampled On : July 29, 2021-11:35 Attn: Michael Kith Sampled By : Aaron Gooderman 1868 East Hazelton Ave. Received On : July 29, 2021-14:52 Stockton, CA 95205 Matrix : Drinking Water Description : Wellhead Project : 18225 River Road 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 256 2.5 mg/L 200.7 08/03/21:208800 200.7 08/03/21:211926 Calcium 63 1 mg/L 200.7 08/03/21:208800 200.7 08/03/21:211926 Magnesium 24 1 mg/1. 200.7 08/03/21:208800 200.7 08/03/21:211926 Potassium 8 1 mg/L 200.7 08/03/21:208800 200.7 08103/21:211926 Sodium 42 1 mgAL 200.7 08/03/21:208800 2003 08103/21:211926 Total Cations 7.2 --- meq/L 200.7 08103/21:208800 200.7 08103/21:211926 Boron 0.1 0.1 mg/L 200.7 08/03/21:208800 200.7 08/03/21:211926 Copper 30 10 ug/L 10002 200.7 08/03/21:208800 200.7 08/03/21:211926 Iron ND 30 ug/L 3002 200.7 08/03/21:208800 200.7 08/03/21:211926 anganese ND 10 ug/L 502 200.7 08/03/21:208800 200.7 08/03/21:211926 Zinc ND 20 ug/L 200.7 08/03/21:208800 200.7 08/03/21:211926 SAR 1.1 0.1 -- 200.7 08/03/21:208800 200.7 08/03/21:211926 Total Alkalinity(as CaCO3) 220 10 mg/L, 23208 08/09/21:209000 2320B 08/10/21:212311 Hydroxide as OH ND 10 mg/L 2320B 08/09/21:209000 2320B 08/10/21:212311 Carbonate as CO3 ND 10 mg/L 2320B 08/09/21:209000 2320B 08/10/21:212311 Bicarbonate as HCO3 260 10 mg/L 2320B 08/09/21:209000 2320B 08/10/21:212311 Sulfate 19.8 0.5 mg/L 5002 300.0 07/30/21:208674 300.0 07/30/21:211830 Chloride 18 1 mg/L 5002 300.0 07/30/21:208674 300.0 07/30/21:211830 Nitrate as NO3 93.9 0.8* mg/L 45 300.0 07/30/21:208674 300.0 07/31/21:211830 Nitrite as N ND 0.2 mg/L. 1 300.0 07/30/21:208674 300.0 07/30/21:211830 Nitrate+Nitrite as N 21.2 0.2* mg/L 10 300.0 07/30/21:208674 300.0 07/31/21:211830 Fluoride ND 0.1 mg/L 2 300.0 07/30/21:208674 300.0 07/30/21:211830 Total Anions 6.7 --- meq/L 2320B 08109/21:209000 2320B 08/10/21:212311 pH(Field) 7.58 --- units 4500-H B 07/29/21:208863 4500HB 07/29/21:211960 Specific Conductance 683 1 umhos/cm 16002 2510B 08/10/21:209101 2510B 08/10/21:212264 Total Dissolved Solids 480 20 mg/L 10002 2540CE 08/02/21:208732 25400 08/03/21:211854 AS Extraction ND 0.1 mg/L, 0.52 55400 07/30/21:208831 55400 07/30/21:211945 Aggressiveness Index 12.1 1 -- 4500-H B 07/29/21:208863 4500HB 07/29/21:211960 angelier Index(20°C) 0.3 1 -- 4500-H B 07/29/21:208863 4500HB 07/29/21:211960 urate Nitrogen 21.2 0.2* mg/L 10 300.0 07/30/21:208674 300.0 07131/21:211830 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