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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 />GAGROUNDZE\QAQC\QAQC.doc <br />8 <br />