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GROUND ZERO ANALYSIS, INC. Quality Control/Quality Assurance Plan contents. During sampling, latex gloves will be worn to prevent cross contamination with other samples. One pair of disposable gloves will be dedicated to each sample collected. Once the sample is collected, each end of the cylinder will be sealed with Teflon tape and then capped with a polyethylene lid, taped, and labeled. The sample will then be individually sealed in a ziplock bag and immediately placed in an ice chest containing dry ice or frozen chemical ice for delivery to a state certified laboratory. Sample identification, storage and transportation will be conducted as outlined in the previous section. 11.3 Sampling From Soil Piles Or Shallow Soil Pits Soil samples will be collected and transported from excavated material in the manner described in the previous section, however, a backhoe will not be utilized. If composite samples are collected, four brass cylinders will be collected for every 50 cubic yards of material to be samples unless otherwise specified by the lead regulatory agency. The samples will be composited by the state certified analytical laboratory personnel prior to testing. 12.0 GROUNDWATER SAMPLING PROTOCOL Prior to arriving at the sampling site, all sampling equipment will be washed with laboratory grade detergent, and rinsed twice with tap water, and once with deionized water. This procedure will be carried out on-site before sampling of other monitoring wells, if more than one well is to be sampled with the same sampling device. Immediately prior to sampling, the depth to water (DTW) in the well will be recorded. The thickness of free phase LNAPL on top of the groundwater, if present, will be measured using an interface probe. The procedure of monitoring is presented in Section 9.0 (Groundwater Monitoring Protocol). If free LNAPL is detected, analysis of groundwater at the interface for dissolve product will not be conducted. A product sample will be collected for source identification, as needed. If free product cannot be removed, an interval specific sampling device may be utilized to collect a sample from below the zone of free product. Before collecting groundwater sample from a well, the well will be purged until indicator parameters (temperature, conductivity and pH) stabilize. This will entail the removal of at least three well casing volumes. Temporary storage of purged water is outlined in Section 10.0, (Well Development Protocol). The indicator parameter measurements will be taken both before and after purging of each well casing volume. Once the well is purged and indicator parameters have stabilized, a sample will be collected after the water level approaches 80 percent of its initial elevation. Where water level recovery is slow, the sample will be collected after stabilization is achieved and enough water is present to fill sample container. Cross contamination from transferring pumps (or bailers) from well to well will be avoided by utilizing dedicated equipment. Where this is not feasible, thorough cleaning of equipment will be performed between sampling rounds. Sampling will proceed from the least contaminated to the most contaminated well, if information is available before sample collection, or if it is indicated by G:\Data\GROUNDZE\QAQC\QAQC.doc 7