COMPLIANCE INFO_2020 - Laserfiche WebLink

Home Browse Search

10.3.1 .2 INDIVIDUAL TRUCK ALIQUOTS A minimum of four (4) of the samples from each truck will be analyzed as outlined below: • TTLC and STLC for Metals (lead, arsenic and copper) via EPA Method 6010B. • TCLP for lead via EPA Method 1311. • pH via EPA Method 9040, EPA Method 9045 (calcareous procedure not used) or other approved test method described in SW-846. (DTES will analyze more than four (4) samples if SW-846, Table 9-1, Equation 8, provides that a higher number of samples is appropriate.) In addition, One (1) of the four (4) samples will have California Title 22 metals (also called CAM 17) metals analysis. This is to confirm other metals, other than those outlined above, are below regulatory limits. The metals listed above are more likely to be present in the ash at higher concentrations than the rest of the CAM 17 metals. The remaining four (4) samples will be retained on site in the event additional laboratory analyses are necessary. 10.3.2 STATISTICAL ANALYSIS The individual truck aliquots results will be used to calculate an 80% confidence interval for each truck. For non-detect ("ND") values the Method Detection Limit ("MDL") will be used. Once the calculations have been completed for the all of the sampled trucks, DTES will use this information to make a Generator Knowledge determination if the ash can reliably be characterized as non-hazardous for the following quarter. At DTES' option, the additional samples collected from each truck may be analyzed and included in the 80% confidence interval calculation. Bottom ash, from the trucks sampled, will be considered Nonhazardous Ash as long as the values of the 80% confidence intervals for each constituent and parameter are below the applicable regulatory thresholds. If the bottom ash is considered hazardous DTES will dispose of and transport the Ash as Hazardous Waste. DTES will then conduct a fuel quality review as outlined in Section 7.1. Once the fuel quality review has been conducted, DTES will repeat the sampling process outlined in Section 10.0 over a period of two weeks instead of one week. If the upper value for the 80% confidence interval for each constituent and parameter are below the applicable regulatory thresholds, then the Ash can be managed as non-hazardous. If the confidence intervals exceed regulatory thresholds, the Ash will be managed as hazardous waste until the problem with the fuel is identified and remedied. At that point, the sampling process outlined in Section 10.0 will be repeated again for two weeks to calculate the 80% confidence interval. 27