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i i i Applied Geotechnology Inc. Groundwater Monitor Well Installation Development and Samplinct Borings PW-1, PW-2, PW-3, and PW-4 were completed as monitor wells. All PVC well construction materials were decontaminated using a high-pressure steam cleaner. r- r. Subsequent to installation, the wells were developed using a clean stain- less steel bailer equipped with a Teflon check valve. The bailer was thoroughly decontaminated prior to placement in each well in accordance with the decontamination procedures outlined below. Approximately 5 casing volumes of water were removed during development. Subsequent to development, each monitor well was purged an additional 3 to S casing volumes prior to sampling using a Teflon bailer. Field personnel periodically measured temperature, pH, and electrical conductivity of the water removed from each well during development/purging to verify and sub- stantiate development/purging adequacy. The specific conductivity meter �. ; was calibrated in the field using standard solutions prior to sampling each well. Measurements in all wells had stabilized by the completion of purg- ing. An arbitrary datum of 140 feet was used as a temporary bench mark established in 1987 at the steel stake pounded in the ground located near the utility pole by the tracks (see notes in Figure 3) . All wells were surveyed in using the arbitrary datum. Groundwater quality samples were collected from each well using a clean Teflon bailer suspended on a nylon cord. The cord was discarded after each well was sampled. fL Samole Control/Shipment After collection, each groundwater sample container was sealed by firmly screwing the lid onto the container and affixing an Applied Geotechnology Inc. Custody Seal across two sides of the lid. Each sample container was labeled identifying the contents with the following information: i o Project name o AGI project number o Sample I.D. � . o Date and time of collection o Analysis o Initials of person collecting sample Following proper sealing and labeling, sample containers were placed on ice in a cooler. Samples were packaged and shipped in accordance with Depart- ment of Transportation (DOT) regulations. For each sampling round, the samples were delivered to the analytical laboratory by AGI field staff returning from Stockton, California the day following sampling. Chain-of- Custody records were filled out and accompanied every shipment of samples Lto the laboratory. I