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Ir Groundwater Monitoring Well Sampling Once the well was successfully purged, a groundwater sample was collected using a disposable polyethylene bailer connected to clean nylon or polyethylene cord The bailer was lowered slowly into the water to avoid agitation of the sample A portion of the sample was place in a container and the morutoring parameters were recorded The remaining portion of the sample was transferred from the bailer to the appropriate, laboratory supplied sampling bottles, using a bottom emptying device The sample containers used for analysis of volatile compounds were filled completely, leaving a positive meniscus, so no airspace remained in the vial after sealing The sample bottles were labeled with the well identification number, date and time of the sample collection, the field technicians initials, lob number, analyses to be performed, and other relevant information Samples were immediately placed in an insulated cooler containing crushed ice The samples were maintained at approximately 4°C until reaching the analytical laboratory Samples were submitted to the analytical laboratory under appropriate chain-of-custody procedures If necessary, samples were shipped from the field directly to the analytical laboratory to minimize the time the samples remained in an iced cooler The analytical laboratory used and the analyses conducted on each sample are identified in.the body of the report Quality Assurance(QuaIity Control Procedures Instrument Calibration Equipment used to monitor groundwater parameters was calibrated prior to beginning purging at the site Monitoring equipment was calibrated following the manufactures • instructions using laboratory grade standards Equipment Decontamination Non-disposable and non-dedicated sampling equipment was cleaned prior to and between uses in each well Downhole equipment was cleaned by washing with a non-phosphate soap solution and rinsing twice with distilled water Duplicate One duplicate sample was collected from the site from a randomly selected monitoring well The duplicate sample was collected at the same tune as the original sample and was treated in the same manner The duplicate sample was submitted to the laboratory for the same analyses as the original Field BIank One field blank was prepared by the technician at the location where the duplicate sample was collected The field blank was prepared, pnor to sampling the well, by filling three 40-m1 VOAs with distilled water The field blank was submitted to the laboratory for analysis of TPHg and BTEX Trip BI rnk A trip blank was prepared by the analytical laboratory and accompanied the sample bottles throughout the shipping and sampling events The trip blank was submitted to the laboratory for analysis of TPHg and BTEX � f I I I i 1 ' f , I ` I