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ENVIRONMENTAL • . Analytical Chemists June 23, 2021 Lab ID : STK2137082-001 Customer ID : 3-17919 San Joaquin Co.Environmental Health Dep Water Quality Division Sampled On : May 19, 2021-10:15 Attn: Michael Kith Sampled By : Aldara Salinas 1868 East Hazelton Ave. Received On : May 19, 2021-11:40 Stockton, CA 95205 Matrix : Drinking Water Description : Wellhead Project : 4700 Lovely Rd.,Tracy CA 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 209 2.5 mg/L 200.7 05/24/21:205769 200.7 05/24/21:207767 Calcium 44 1 mg/L 200.7 05/24/21:205769 200.7 05/24/21:207767 Magnesium 24 1 mg/L 200.7 05/24/21:205769 200.7 05/24/21:207767 Potassium 4 1 mg/L 200.7 05/24/21:205769 200.7 05/24/21:207767 Sodium 128 1 mg/L 200.7 05/24/21:205769 200.7 05/24/21:207767 Total Cations 9.8 --- meq/L 200.7 05/24/21:205769 200.7 05/24/21:207767 Boron 0.8 0.1 mg/L 200.7 05/24/21:205769 200.7 05/24/21:207767 Copper ND 10 ug/L 10002 200.7 05/24/21:205769 200.7 05124/21:207767 Iron 390 30 ug/L 3002 200.7 05/24/21:205769 200.7 05/24/21:207767 Manganese 70 10 ug/L 502 200.7 05/24/21:205769 200.7 05/24/21:207767 Zinc 1100 20 ug/L 200.7 05/24/21:205769 200.7 05/24/21:207767 SAR 3.9 0.1 -- 200.7 05/24/21:205769 200.7 05/24/21:207767 Total Alkalinity(as CaCO3) 130 10 mg/L 2320E 05/27/21:205889 23208 05/28/21:208034 Hydroxide as OH ND 10 mgAL 2320E 05/27/21:205889 2320B 05/28/21:208034 arbonate as CO3 ND 10 mg/L 23208 05/27/21:205889 23208 05/28/21:208034 Bicarbonate as HCO3 160 10 mg/L 2320E 05/27/21:205889 2320B 05/28/21:208034 Sulfate 214 1* mg/L 5002 300.0 06/09/21:206443 300.0 06/10/21:208775 Chloride 106 1 mg/L 5002 300.0 06/09/21:206443 300.0 06/10/21:208775 Nitrate as NO3 ND 0.9 mg/L 45 450ONO3F 05/20/21:205642 450ONO3F 05/20/21:207567 Nitrite as N ND 0.2 mg/L I 450ONO3F 05/20/21:205643 450ONO3F 05/20/21:207564 Nitrate+Nitrite as N ND 0.2 mg/L 10 450ONO3F 05/20/21:205642 450ONO3F 05/20/21:207567 Fluoride ND 0.1 mg/L 2 300.0 06/09/21:206443 300.0 06/10/21:208775 Total Anions 10.1 --- meq/L 23208 05/27/21:205889 23208 05/28/21:208034 pH(Field) 7.7 -- units 4500-H B 05/19/21:205788 05/19/21:207776 pecific Conductance 1070 1 umhos/cm 16002 2510E 05/28/21:205946 2510B 05/28/21:208005 Total Dissolved Solids 650 20 mg/L 1000 2540CE 05/21/21.205653 2540C 05/24/21:207709 AS Extraction ND 0.1 mg/L 0.52 5540C 05/20/21:205941 5540C 05/20/21:208000 Aggressiveness Index 11.9 1 -- 4500-H B 05/19/21:205788 05/19/21:207776 Langelier Index(20°C) -0.03 1 -- 4500-H B 05/19/21:205788 05/19/21:207776 I[Nitrate Nitrogen ND 0.2 m 10 450ONO3F 05/20/21:205642 450ONO3F 05/20/21:207567 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&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