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