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ENVIRONMENTAL Analvtical Chemists March 16, 2022 Lab ID : STK2232269-001 Customer ID : 3-17919 San Joaquin Co. Environmental Health Dep Water Quality Division Sampled On : February 14, 2022-14:23 Attn: Michael Kith Sampled By : Frank Girardi 1868 East Hazelton Ave. Received On : February 14,2022-15:30 Stockton, CA 95205 Matrix : Drinking Water Description : Wellhead Project : 2868 Burge Road, Stockton, CA 95215 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 91.0 2.5 mg/L 200.7 02/15/22:201778 200.7 02/15/22:202338 Calcium 20 1 mg/L 200.7 02/15/22:201778 200.7 02/15/22:202338 Magnesium 10 1 mg/L 200.7 02/15/22:201778 200.7 02/15/22:202338 Potassium 6 1 mg/L 200.7 02/15/22:201778 200.7 02/15/22:202338 Sodium 12 1 mg/L 200.7 02/15/22:201778 200.7 02/15/22:202338 Total Cations 2.5 --- meq/L 200.7 02/15/22:201778 200.7 02/15/22:202338 Boron ND 0.1 mg/L 200.7 02/15/22:201778 200.7 02/15/22:202338 Copper ND 10 ug/L 10002 200.7 02/15/22:201778 200.7 02/15/22:202338 Iron ND 30 ug/L 3002 200.7 02/15/22:201778 200.7 02/15/22:202338 anganese ND 10 ug/L 502 200.7 02/15/22:201778 200.7 02/16/22:202432 inc ND 20 ug/L 200.7 02/15/22:201778 200.7 02/15/22:202338 SAR 0.5 0.1 -- 200.7 02/15/22:201778 200.7 02/15/22:202338 Total Alkalinity(as CaCO3) 100 10 mg/L 2320E 02/21/22:202017 2320B 02/22/22:202721 Hydroxide as OH ND 10 mg/L 2320B 02/21/22:202017 2320B 02/22/22:202721 Carbonate as CO3 ND 10 mg/L 2320B 02/21/22:202017 2320E 02/22/22:202721 (carbonate as HCO3 120 10 mg/L 2320B 02/21/22:202017 2320E 02/2222:202721 Sulfate 3.8 0.5 mg/L 5002 300.0 02/1522:201760 300.0 02/1522:202368 Chloride 3 1 mg/L 5002 300.0 02/1522:201760 300.0 02/1522:202368 Nitrate as NO3 4.0 0.4 mg/L 45 300.0 02/1522:201760 300.0 02/1522:202368 itrite as N ND 0.2 mg/L 1 300.0 02/1522:201760 300.0 02/1522:202368 Nitrate+Nitrite as N 0.9 0.1 mg/L 10 300.0 02/1522:201760 300.0 02/1522:202368 Fluoride ND 0.1 mg/L 2 300.0 02/15/22:201760 300.0 02/1522:202368 Total Anions 2.2 --- meq/L 2320B 022122:202017 2320B 02/2222:202721 pH 8.28 --- units 4500-H B 02/1822:201927 4500HB 02/1822:202528 Specific Conductance 226 1 umhos/cnl 16002 2510E 02/1822:201891 2510B 02/1822:202476 Total Dissolved Solids 180 20 mg/L 10002 2540CE 02/16/22:201804 2540C 02/1722:202436 MBAS Extraction ND 0.1 mg/L 0.52 5540C 02/1622:201970 5540C 02/1622:202595 Aggressiveness Index 12.0 1 -- 4500-H B 02/1822:201927 450ORB 02/1822:202528 Langelier Index(20°C) 0.2 1 -- 4500-H B 02/1822:201927 4500HB 02/1822:202528 11Nitrate Nitrogen 1 0.9 1 0.1 1 mg/L 1 10 1 300.0 02/1522:201760 300.0 02/1522:202368 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 8 Corporate Offices&Laboratory Office 6 Laboratory Office&Laboratory Office S 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