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EXHIBIT A i BROWN AND CALDWELL FIELD PROCEDURES Exhibit A describes Brown and Caldwell field procedures for groundwater sampling from monitoring wells, and sample handling GROUNDWATER SAMPLING Prior to collecting a sample of groundwater from a well,the well will be purged by removing three or more well volumes of water,using either appump or a bailer A well volume is defined as the amount of groundwater in the well casing Tlie pH, temperature, and electrical conductivity of the water will be measured periodically during the purging A dissolved oxygen (DO) meter with a probe capable to measure DO within the water column of the well will be used DO will be measured prior to purging The groundwater sample will be obtained with a Teflon or a disposable polyethylene bailer equipped with a bottom-emptying valve To release water from the bailer with minimal aeration, theprotrusion on the bottom-emptying device actuates the bottom check valve and regulates the flow into the sample bottle The sample containers will be obtained precleaned from the analytical laboratory, and it will be specific with respect to size and matenal to the type of analysis to be performed The container will be carefully filled to the very top, in order to create a positive meniscus, and sealed with a Teflon-lined cap (septa) These precautions aid in eliminating air from the sample The sample will be visually inspected to ensure that no air bubbles remain within Depending on the type of analysis required, samples will be preserved with a chemical preservative and/or cooled to 4 degrees Celsius Samples then will be labeled, stored, and transported in cooled ice chests to the analytical laboratory within the permissible holding time SAMPLE HANDLING Samples are handled during collection and shipment in such a way as to ensure maximum sample quality and integrityAll samples will be collected by experienced Brown and Caldwell field personnel The sampls will be collected in containers that are appropriate to the sample material and the required analyses All sample containers are precleaned b the analytical laboratory or the container manufacturer or are decontaminated in the field by washing with laboratory-grade detergent, rinsing with tap water, and then rinsing with deionized water All sampling equipment will be decontaminated prior to and between use Each sample container will have a label affixed in the field that identifies the date and time of sample collection, name of sampler,fob number, and a unique sample number This information will be recorded on the boring log or in the field records Samples are stored and This report was prepared in accordance with the standards of the environmental consulting industry at the time it was prepared It should not be relied upon by parties otber than those for whom it was prepared,and then only to the extent of the scope of work which was authorized This report does not guarantee that no additional environmental contamination beyond that described in this report exists at the site BCSACOAP 116o001162711WRKPLN2 doc