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GROUND ZERO ANALYSIS, INC. Quality Control/Quality Assurance Plan <br /> the most contaminated well, if information is available before sample collection, or if it is <br /> indicated by evidence. Where several types of analysis will be performed for a given well, <br /> individual samples will be collected in the following order: <br /> 1. Volatile organics <br /> 2. Purgeable organic hydrocarbons <br /> 3. Purgeable organic halogens <br /> 4. Total organic hydrocarbons <br /> 5. Total organic halogens <br /> 6. Extractable organics <br /> 7. Total metals <br /> 8. Dissolved metals <br /> 9. Phenols <br /> 10. Cyanide <br /> The specific analytical methods to be utilized for the common volatile/semivolatile analyses are <br /> shown on Table 2. <br /> Groundwater samples will be collected with a Teflon bailer with bottom emptying device. <br /> Duplicate samples will be transferred to vials or containers that meet Regulatory Agency <br /> specifications (Table 1). Groundwater from the bailer will be transferred to the sample container <br /> by allowing the fluid to flow slowly along the sides of the vessel. All containers will be filled <br /> above the top of the opening to form a positive meniscus. No head space should be present in <br /> the sample container once it is sealed. After the vial is capped it will be inverted to check for air <br /> bubbles. If bubbles are present the sample will be discarded and replaced. If it is not possible to <br /> collect a sample without head space, the problem will be noted on the field technician's sampling <br /> log. <br /> Immediately following sample collection, samples will be labeled and stored in an ice chest <br /> containing frozen chemical ice sealed in plastic bags. Sample labels will contain the following <br /> information: date, time, project ID, sample ID, and name of sampler and type of analysis. All <br /> samples will be transported under chain of custody protocol to a state certified laboratory within <br /> 24 hours. A sample container filled in the laboratory with organic free water and carried <br /> unopened during the sampling trip will also be provided (Trip Blank). A "high-low" temperature <br /> recording thermometer will accompany sample shipments to ensure proper sample temperature <br /> maintenance. <br /> Samples will be transported either by GZA personnel or by private courier. Analytical holding <br /> times will be considered in determining sampling and shipping schedules. Friday <br /> shipment/Saturday laboratory receipt of samples will be coordinated in advance with the <br /> laboratory. <br /> G:\GR0UNDZE\QAQC\QAQC.doc <br /> 8 <br />