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ENVIRONMENTAL Analytical Chemists May 5, 2021 Lab ID : STK2135171-001 Customer ID : 3-17919 San Joaquin Co.Environmental Health Dep Water Quality Division Sampled On : April 15, 2021-13:15 Attn: Michael Kith Sampled By : Francisco Garcia Rui 1868 East Hazelton Ave. Received On : April 15, 2021-14:15 Stockton, CA 95205 Matrix : Drinking Water Description : Wellhead Project : 21301 N. Horseshoe Ct.,Clements 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 120 2.5 mg/L 200.7 04/16/21:204151 200.7 04/19/21:205711 Calcium 25 1 mg/L 200.7 04/16/21:204151 200.7 04/19/21:205711 Magnesium 14 1 mg/L 200.7 04/16/21:204151 200.7 04/19/21:205711 Potassium 6 1 mg/L 200.7 04/16/21:204151 200.7 04/19/21:205711 Sodium 13 1 mg/L 200.7 04/16/21:204151 200.7 04/19/21:205711 Total Cations 3.1 --- meq/L 200.7 04/16/21:204151 200.7 04/19/21:205711 Boron ND 0.1 mg/L 200.7 04/16/21:204151 200.7 04/19/21:205711 Copper ND 10 ug/L 10002 200.7 04/16/21:204151 200.7 04/19/21:205711 Iron 70 30 ug/L 3002 200.7 04/16/21:204151 200.7 04/19/21:205711 anganese 70 10 ug/L 502 200.7 04/16/21:204151 200.7 04/19/21:205711 inc 50 20 ug/L 200.7 04/16/21:204151 200.7 04/19/21:205711 SAR 0.5 0.1 -- 200.7 04/16/21:204151 200.7 04/19/21:205711 Total Alkalinity(as 130 10 mg/L 2320E 04/25/21:204475 2320E 04/25/21:206086 CaCO3) Hydroxide as OH ND 10 mg/L 2320E 04/25/21:204475 2320E 04/25/21:206086 Carbonate as CO3 ND 10 mg/L 23208 04/25/21:204475 2320E 04/25/21:206086 Bicarbonate as HCO3 150 10 mg/L 23208 04/25/21:204475 2320B 04/25/21:206086 Sulfate 4.8 0.5 mg/L 5002 300.0 04/16/21:204132 300.0 04/16/21:205853 Chloride 21 1 mg/L 5002 300.0 04/16/21:204132 300.0 04/16/21:205853 itrate as NO3 1.6 0.4 mg/L 45 300.0 04/16/21:204132 300.0 04/16/21:205853 Nitrite as N ND 0.2 mg/L 1 300.0 04/16/21:204132 300.0 04/16/21:205853 Nitrate+Nitrite as N 0.4 0.1 mg/L 10 300.0 04/16/21:204132 300.0 04/16/21:205853 Fluoride 0.1 0.1 mg/L 2 300.0 04/16/21:204132 300.0 04/16/21:205853 Total Anions 3.2 --- meq/L 2320E 04/25/21:204475 2320E 04/25/21:206086 pH(Field) 7.3 -- units 4500-H B 04/15/21:204291 04/15/21:205789 Specific Conductance 334 1 umhos/cm 16002 2510E 04/20/21:204225 2510B 04/20/21:205710 Total Dissolved Solids 220 20 mg/L 10002 2540CE 04/19/21:204194 25400 04/20/21:205728 MBAS Extraction ND 0.1 mg/L 0.52 55400 04/16/21:204476 5540C 04/16/21:206003 Aggressiveness Index 11.2 1 -- 4500-H B 04/15/21:204291 04/15/21:205789 Langelier Index(20°C) -0.6 1 -- 4500-H B 04/15/21:204291 04/15/21:205789 IN itrate Nitrogen 0.4 0.1 mg/L 10 300.0 04/16/21:204132 300.0 04/16/21:205853 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