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ENVIRONMENTAL . . Analytical Chemists April 29, 2021 Lab ID : STK2134563-001 Customer ID : 3-17919 San Joaquin Co.Environmental Health Dep Water Quality Division Sampled On : April 7, 2021-11:25 Attn: Michael Kith Sampled By : Francisco Garcia Rui 1868 East Hazelton Ave. Received On : April 7, 2021-12:25 Stockton, CA 95205 Matrix : Drinking Water Description : Wellhead Project : 17200 W. Byron Rd., Tracy, CA 95304 Sample Result - Inorganic Constituent Result PQL Units MCLJAL Sample Preparation Sample Analysis Method Date/ID Method Date/ID General Mineral Total Hardness as CaCO3 450 2.5 mg/L 200.7 04/09/21:203850 200.7 04/10/21:205265 Calcium 73 1 mg/L 200.7 04/09/21:203850 200.7 04/10/21:205265 Magnesium 65 1 mg/L 200.7 04/09/21:203850 200.7 04/10/21:205265 Potassium 2 1 mg/L 200.7 04/09/21:203850 200.7 04/10/21:205265 Sodium 423 1 mg/L 200.7 04/09/21:203850 200.7 04/10/21:205265 Total Cations 27.4 --- meq/L 200.7 04/09/21:203850 200.7 04/10/21:205265 Boron 3.2 0.1 mg/L 200.7 04/09/21:203850 200.7 04/10/21:205265 Copper ND 10 ug/L 10002 200.7 04/09/21:203850 200.7 04/10/21:205265 Iron 60 30 ug/L 3002 200.7 04/09/21:203850 200.7 04/10/21:205265 Manganese 110 10 ug/L 502 200.7 04/09/21:203850 200.7 04/10/21:205265 Inc ND 20 ug/L 200.7 04/09/21:203850 200.7 04/10/21:205265 SAR 8.7 0.1 -- 200.7 04/09/21:203850 200.7 04/10/21:205265 Total Alkalinity(as 190 10 mg/L 2320B 04/13/21:203994 2320B 04/13/21:205468 aCO3) Hydroxide as OH ND 10 mg/L. 2320B 04/13/21:203994 2320B 04/13/21:205468 Carbonate as CO3 ND 10 mg/L 2320B 04/13/21:203994 2320B 04/13/21:205468 Bicarbonate as HCO3 230 10 mg/L 2320B 04/13/21:203994 2320B 04/13/21:205468 Sulfate 658 5* mg/L. 5002 300.0 04/08/21:203777 300.0 04/08/21:205201 hloride 470 10* mg/L 5002 300.0 04/08/21:203777 300.0 04/08/21:205201 Nitrate as NO3 8.2 0.4 mg/L. 45 300.0 04/08/21:203777 300.0 04/08/21:205201 Nitrite as N ND 0.2 mg/L, 1 300.0 04/08/21:203777 300.0 04/08/21:205201 Nitrate+Nitrite as N 1.9 0.1 mg/L. 10 300.0 04/08/21:203777 300.0 04/08/21:205201 Fluoride ND 0.1 mg/1- 2 300.0 04/08/21:203777 300.0 04/08/21:205201 Total Anions 30.9 --- meq/L 2320B 04/13/21:203994 2320B 04/13/21:205468 pH(Field) 7.2 -- units 4500-H B 04/07/21:203991 04/07/21:205386 Specific Conductance 3190 1 Umhos/cm 16002 2510B 04/15/21:204068 2510B 04/15/21:205501 Total Dissolved Solids 2050 20 mg/L 1.0002 2540CE 04/09/21:203818 25400 04/12/21:205287 MBAS Extraction ND 0.1 mg/L 0.52 55400 04/09/21:203870 55400 04/09/21:205225 Aggressiveness Index 11.7 1 -- 4500-H B 04/07/21:203991 04/07/21:205386 Langelier Index(20°C) -0.2 1 -- 4500-H B 04/07/21:203991 04/07/21:205386 Nitrate Nitrogen 1.9 0.1 mg/L 10 300.0 04/08/21:203777 300.0 04/08/21:205201 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