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ENVIRONMENTAL • , Analytical Chemists October 19, 2021 Lab ID : STK2153763-001 Customer ID : 3-17919 San Joaquin Co. Environmental Health Dep Water Quality Division Sampled On : September 23, 2021-10:25 Attn: Michael Kith Sampled By : Naseem Ahmed 1868 East Hazelton Ave. Received On : September 23,2021-11:30 Stockton, CA 95205 Matrix : Drinking Water Description : Wellhead Project : 8253 Linne Rd.,Tracy 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 421 2.5 mg/L 200.7 09/29/21:211311 200.7 09/29/21:215242 Calcium 116 1 mg/L 200.7 09/29/21:211311 200.7 09/29/21:215242 Magnesium 32 1 mg/L 200.7 09/29/21:211311 200.7 09/29/21:215242 Potassium 4 1 mg/L 200.7 09/29/21:211311 200.7 09/29/21:215242 Sodium 113 1 mg/L 200.7 09/29/21:211311 200.7 09/29/21:215242 Total Cations 13.4 --- meq/L 200.7 09/29/21:211311 200.7 09/29/21:215242 Boron 1.1 0.1 mg/L 200.7 09/29/21:211311 200.7 09/29/21:215242 Copper 10 10 ug/L 10002 200.7 09/29/21:211311 200.7 09/29/21:215242 Iron ND 30 ug/L 3002 200.7 09/29/21:211311 200.7 09/29/21:215242 anganese ND 10 ug/L 502 200.7 09/29/21:211311 200.7 09/29/21:215242 Zinc 30 20 ug/L 200.7 09/29/21:211311 200.7 09/29/21:215242 SAR 2.4 0.1 -- 200.7 09/29/21:211311 200.7 09/29/21:215242 Total Alkalinity(as CaCO3) 110 10 mg/L 2320B 10/04/21:211489 2320B 10/05/21:215539 Hydroxide as OH ND 10 mg/L 2320B 10/04/21:211489 2320B 10/05/21:215539 Carbonate as CO3 ND 10 mg/L 2320B 10/04/21:211489 2320E 10/05/21:215539 Bicarbonate as HCO3 130 10 mg/L 2320E 10/04/21:211489 2320B 10/05/21:215539 Sulfate 260 1.5* mg/L 5002 300.0 09/24/21:211113 300.0 09/25/21:215016 Chloride 158 3* mg/L 5002 300.0 09/24/21:211113 300.0 09/25/21:215016 Nitrate as NO3 47.6 0.4 mg/L 45 300.0 09/24/21:211113 300.0 09/24/21:215016 itrite as N ND 0.2 mg/L 1 300.0 09/24/21:211113 300.0 09/24/21:215016 Nitrate+Nitrite as N 10.8 0.1 mg/L 10 300.0 09/24/21:211113 300.0 09/24/21:215016 Fluoride 0.1 0.1 mg/L 2 300.0 09/24/21:211113 300.0 09/24/21:215016 Total Anions 12.8 --- meq/L 2320B 10/04/21:211489 2320B 10/05/21:215539 H(Field) 9.35 --- units 4500-H B 09/23/21:211154 4500HB 09/23/21:214999 Specific Conductance 1320 1 umhos/cm 16002 2510B 10/07/21:211632 2510B 10/07/21:215624 Total Dissolved Solids 870 20 mg/L 10002 2540CE 09/28/21:211258 25400 09/29/21:215172 AS Extraction ND 0.1 mg/L 0.52 5540C 09/24/21:211432 55400 10/01/21:215360 Aggressiveness Index 13.9 1 -- 4500-H B 09/23/21:211154 4500HB 09/23/21:214999 Langelier Index(20°C) 2.0 1 -- 4500-H B 09/23/21:211154 4500HB 09/23/21:214999 itrate Nitrogen 1 10.8 1 0.1 1 m /L 1 10 1 300.0 09/24/21:211113 300.0 09/24/21:215016 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.Undo 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