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Samples are collected using a simple random sampling strategy. Equipment used for sampling consist of stainless steel or aluminum trowels or container. Prior to collecting the daily samples, the equipment is cleaned using a liquinox/distilled water wash followed by a distilled water rinse. Cleaning is performed in separate clean 5-gallon plastic buckets or similar containers. Cleaning buckets are dedicated to this task and discarded if they become permanently soiled. The sampling methodology outlined in this AMP describes the general procedures and methods for sample collection, logging, control, and submittal for laboratory analysis. 10.1.1.1 STORAGE SILO ALIQUOTS The sampling frequency outlined in this AMP includes collection of aliquots during freefall from the storage silo into the truck. Fly ash is sampled by collecting a minimum of 100 grams of material, a minimum of eight (8) random passes across the freefall line of ash as it is deposited into the truck. A master sample control log will be maintained that documents the date of sample collection, sample type (fly or bottom), truck number, name and initials of sampler, sample ID number, and a column for comments on the sample. Following collection, the samples will be maintained and submitted for laboratory analysis under proper chain of custody procedures. 10.1.1.2 INDIVIDUAL TRUCK ALIQUOTS A minimum of four (4) of the samples from each truck will be analyzed as outlined below: • TTLC and STLC Metals lead and arsenic via EPA Method 60106. • 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.) The remaining four (4) samples will be retained on site in the event additional laboratory analyses are necessary. One (1) of the four samples will have California Title 22 metals (also called CAM 17) metals analysis. This is to confirm other metals, other than those outlined below, are below regulatory limits. The metals listed below are more likely to be present in the ash at higher concentrations than the rest of the CAM 17 metals. 10.2 FLY ASH STATISTICAL ANALYSIS The individual truck aliquots results will be used to calculate an 80% confidence interval for each truck (with the exception of the CAM 17 metals). For non-detect ("ND") values 23