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