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Ms. Jill Davis ENTEK LUSD 12/7/20 Range of ECG-20- ECG-20- ECG-20- TTLC Values 5659-10M 5659-11M 5659-16M Analyte (mg/kg) mg/I for Which an mg/kg mg/kg mg/kg STLC Must be Done Antimony 500 15 >_ 150 mg/kg ND ND ND Arsenic 500 5 >_50 mg/kg 2.9 21 7.9 Barium 10,000 100 >_ 1000 mg/kg 51 340 270 Beryllium 75 0.75 >_ 7.5 mg/kg ND ND ND Cadmium 100 1 >_ 10 mg/kg ND ND 3.6 Chromium 2,500 5 >_ 50 mg/kg 10 ND 61 Cobalt 8,000 80 >_ 800 mg/kg 42,000 24,000 16 Copper 2,500 25 >_ 250 mg/kg 6.6 3.1 39 Lead 1,000 5 >_50 mg/kg ND ND 51 Mercury 20 0.2 >_ 2 mg/kg ND ND ND Molybdenum 3,500 350 >_ 3500 mg/kg ND ND 3.1 Nickel 2,000 20 >_ 200 mg/kg ND ND 25 Selenium 100 1 >_ 1000 mg/kg ND ND ND Silver 500 5 >_50 mg/kg ND ND ND Thallium 700 7 >_ 70 mg/kg 66 39 ND Vanadium 2,400 24 >_ 240 mg/kg 13 4.4 79 >_ 2,500 Zinc 5,000 250 mg/kg 10 10 34 *Please refer to the table in Appendix B for a list of samples that did not exceed the TTLC or STLC Metals -CAM17 Results Summary • Sample ECG-20-5659-10M- Unlabeled pink clay like material in small plastic container located on of the storage desk with large pull out drawers in the ceramics classroom. • Exceeds TTLC threshold for Cobalt. • Sample ECG-20-5659-11 M- Unlabeled Tan clay like material in small plastic container located on of the storage desk with large pull out drawers in the ceramics classroom. • Exceeds TTLC threshold for Cobalt. • Sample ECG-20-5659-16M- Unlabeled Tan clay like material in large plastic trash can inside ceramics classroom. • Has a High Probability of Exceeding STLC Threshold for Lead since it is over 10 times the STLC Limit for Lead. 21