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ENVIRONMENTALM Analytical Chemists December 22, 2020 Lab ID : STK2056526-005 Customer ID : 3-12023 Luhdorff& Scalmanini, Consulting Eng. Attn: Jeanette Lovelis Sampled On : November 24, 2020-13:00 500 First Street Sampled By : Will Zimmerman Woodland, CA 95695 Received On : November 24, 2020-14:40 Matrix : System Description : Hall Project : Water Monitoring Sample Result-Inorganic Constituent Result PQL Units Note Sample Preparation Sample Analysis Method Date/ID Method Date/ID General Mineral Total Hardness as CaCO3 212 2.5 mg/L 200.7 11/25/20:213996 200.7 11/25/20:219019 Calcium 57 1 mg/L 200.7 11/25/20:213996 200.7 11/25/20:219019 Magnesium 17 1 mg/L 200.7 11/25/20:213996 200.7 11/25/20:219019 Potassium 2 1 mg/L 200.7 11/25/20:213996 200.7 11/25/20:219019 Sodium 71 1 mg/L 200.7 11/25/20:213996 200.7 11/25/20:219019 Total Cations 7.4 --- meq/L 200.7 11/25/20:213996 200.7 11/25/20:219019 Boron 0.4 0.1 mg/L 200.7 11/25/20:213996 200.7 11/25/20:219019 Copper ND 10 ug/L 200.7 11/25/20:213996 200.7 11/25/20:219019 Iron ND 30 ug/L 200.7 11/25/20:213996 200.7 11/25/20:219019 Manganese ND 10 ug/L 200.7 11/25/20:213996 200.7 11/25/20:219019 Zinc ND 20 ug/L 200.7 11/25/20:213996 200.7 11/25/20:219019 Total Alkalinity(as CaCO3) 180 IO mg/L 2320B I2/05/20:214246 2320a 12/06/20:219438 Hydroxide as OH ND 10 mg/L 2320B 12/05/20:214246 2320B 12/06/20:219438 Carbonate as CO3 ND 10 mg/L 2320E 12/05/20:214246 2320E 12/06/20:219438 Bicarbonate as HCO3 220 10 mg/L 2320B 12/05/20:214246 2320B 12/06/20:219438 Sulfate 80.6 0.5 mg/L 300.0 11/25/20:214055 300.0 11/25/20:219093 Chloride 87 1 mg/L 300.0 11/25/20:214055 300.0 11/25/20:219093 Nitrate as NO3 10.0 0.4 mg/L 300.0 11/25/20:214055 300.0 11/25/20:219093 Nitrite as N ND 0.2 mg/L 300.0 11/25/20:214055 300.0 11/25/20:219093 Nitrate+Nitrite as N 2.3 0.1 mg/L 300.0 11/25/20:214055 300.0 11/25/20:219093 Fluoride 0.2 0.1 mg/L 300.0 11/25/20:214055 300.0 11/25/20:219093 Total Anions 7.9 --- meq/L 2320B 12/05/20:214246 2320B 12/06/20:219438 pH(Field) 8.1 -- units 4500-H B 11/24/20:214414 4500HB 11/24/20:219936 Specific Conductance 840 1 umhos/cm 2510B 12/07/20:214325 2510B 12/07/20:219457 Total Dissolved Solids 480 20 mg/L 2540CE 11/30/20:214057 25400 12/01/20:219183 Total Dissolved Solids 545 0 mg/L 200.7 11/25/20:213996 200.7 11/25/20:219019 (sum) MBAS Screen Negative 0.1 mg/L 55400 11/25/20:214067 55400 11/25/20:219118 Aggressiveness Index 12.5 1 -- 4500-H B 11/24/20:214414 4500HB I1/24/20:219936 Langelier Index(20°C) 0.6 1 -- 4500-H B 11/24/20:214414 4500HB 11/24/20:219936 Nitrate Nitrogen 1 2.3 1 0.1 1 mg/L 300.0 11/25/20:214055 300.0 11/25/20:219093 ND=Non-Detected.PQL=Practical Quantitation Limit.•PQL adjusted for dilution. Page 7 of l I 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.2'