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Stockton Wretg .d 3 November 16, 1990 r Section 66699. Any waste is considered a hazardous waste if the concentrations exceeds the TTLC Levels shown in the last column below. Summary of Analytical Result for Total Metal Concentrations Detected (all results in milligrams per kilogram/ppm) CONSTITUEN7 Sample Sample Sample Sample Sample TTLC 1-1 2-I 3-1 Q-I 5-1 Cadmium I.5 ND ND ND N-D 100 Chromium 52 54 14 67 35 2500 Lead 150 240 13 22 110 1000 Nickel 29 27 6.2 33 18 2000 ND: not detected at miniTnum detection Limit The detected concentrations of metals in the soil samples were all below the criteria which would classify the material as hazardous according to CCR. Title 22, Chapter 30, Article 11, Sections 66699. - Sections 66699 of CCR, Title 22 specify two criteria for determining hazardous concentrations of "Persistent and Bioaccumulative Toxic. Substances". The first criterion is a measure of the total concentration of the element in a given sample that is compared to the allowable TTLC limit- The second criterion is a measure of the soluble amount of the element or compound which can be obtained by subjecting the sample to a leaching procedure known as a Waste Extraction Test (WET) and then compared to" the allowable Soluble Limit Threshold Concentration (STLC). If an element or compound in a sample exceeds the allowable TTLC or STLC, then the material from which that sample was taken would be classified as hazardous waste. Because the WET procedure involves a dilution of "the original sample extract, a rule of thumb applied by consultants, laboratories and regulatory personnel is that the WET is performed only when the total concentration of a compound in a sample is greater than ten times the STLC. Since three samples (Samples 1-1, 2-1, and 5-1) exceeded the STLC for lead by ten times, a WET was preformed on those samples. The results of the Waste Extraction Test are presented in the table below. ,Any waste is ES-0497-SNI 901 1-F-038.LTR