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Geological?ecknics Inc. Page 2 U.S. Can Company Work Plan-Appendix A Project No. 397.2 August 9, 1996 2.0 QUALITY ASSURANCE PROGRAM The following measures will be taken by Geological Technics Inc. to ensure that a high quality study is conducted and that cross contamination does not occur. 2.1 Equipment Soil borings may be drilled with a hollow stem continuous flight auger, owned and operated by a licensed well driller. Soil samples may be collected using a 2 inch (i.d.) modified California split spoon sampler, or continuous coring device, lined with brass sample tubes. 2.2 Boring Logs A detailed log will be made of each boring. The information to be noted includes: sample depths, blow counts if continuous coring devise is not used, horizons of detectable contamination (detected by field methods), soil classification utilizing the Unified Soil Classification System and sediment description (color, texture, composition,hardness,moisture content,and post-depositional changes that have occurred in the sediments). 2.3 Cross Contamination Prevention All sample equipment(split spoon sampler or core tube,brass tubes etc.)and auger(drilling rod, drilling bits,& auger, etc.)will be thoroughly cleaned before being used and between uses. Wash water may be containerized in DOT approved 55 gallon drums, labeled, and stored on site until their disposition can be arranged. Plastic gloves will be worn during sample collection and changed between all samples. 2.4 Chain of Custody Chain of Custody (CofC) forms are legal documents used to track the handling of samples All dates, times, persons and their companies will be listed from the time the sample is collected to its ultimate disposal. A CofC form will be filled out for all samples collected. The CofC will be tracked to ensure sample integrity. 2.5 Sample Analysis Samples will be analyzed for the appropriate constituents by a licensed laboratory. 2.6 Data Reduction Analytical data will be integrated with the geological data gathered during field investigation. Cross sections will be prepared to illustrate the stratigraphy and the distribution of soil contamination. The cross sections may be used for interpreting the extent of contamination. 2.7 Groundwater Sampling Procedure Groundwater sampling procedure is as follows: Arriving on site the stainless steel submersible pump/stainless steel bailer is assembled and the sampling equipment prepared. The wells are unlocked, opened, and depth to water is measured from the top of casing. As a matter of procedure, the following actions are taken to evaluate the presence of floating product, or third phase contaminant material on the groundwater. If field evidence suggests that floating product may be present (i.e.,the well has a strong odor of hydrocarbons and gasoline is observed on the water meter probe), then either a bailer or product/water interface meter is used to measure the thickness of floating product on the surface of the groundwater. In the event that floating product is present, that well would not be sampled unless specifically requested. The pump/bailer is inserted into the well, lowered to a depth of 6 to 8 inches above the bottom and activated. Water flow is monitored visually for cloudiness and measured for flow rate, temperature, conductivity, and pH. At least three well volumes are purged from the well prior to sampling until pH, conductivity, and temperature had stabilized to ensure sampling from representative formation water. After stabilization of water parameters, the well is allowed to recharge. Prior to sampling the well, a bailer blank is collected by pouring water provided by the laboratory into the bailer and emptying it into a sample