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Since this is a construction site and the proposed building will encompass the majority of the site, the wells have been located yw , so that they will be accessible upon completion of the construc- tion. The wells will be developed by a combination of swabbing, bail- ing, and pumpage using a 3 inch submersible pump; air development methods will not be employed. Development will continue until the well discharge water is sediment free, or until a total of 2 hours of development time has elapsed. The swab, bailer and pump i ' will be thoroughly cleaned prior to first use and between each well with a high pressure, potable water spray rinse. Following development, the wells will remain idle for at least one week � s prior to sampling. once completed the wells will be surveyed from a known location to determine the on--site gradient. _ i=a 5.3 Soil Sampling ks F-A During the drilling of the exploratory boreholes and the monitor well boreholes, soil samples will be collected from each location I at 5 feet below grade and at 5 foot intervals thereafter down to groundwater. Sampling at the deep (40 foot) boring will continue into the saturated material at 5 foot intervals. Those unsatu- rated samples appearing visually stained, odorous, exhibiting evidence of chemical presence or producing a response on a field screening instrument (a HNu photoionizer) will be submitted for chemical analysis. If no samples appear suspect, then the r. , . unsaturated sample closest to groundwater will be submitted for 1, analysis. A minimum of 2 soil samples per exploratory boring and 1 sample per monitor well boring will be submitted for chemical analysis. The two soil samples from the soil borings will came from the 5' depth and from directly above the saturated zone. The sample from the monitoring well instGllation will be from directly above the saturated zone. Those samples not initially selected for chemical analysis will be archived at the laboratory r for possible future analysis. r.5 Prior to collection of these samples, the split-spoon sampler will be decontaminated by scrubbing with a bristle brush in a solution of potable water and non-phosphate detergent (such as Alconox) , followed by potable water rinse and completed with a final spray rinse of distilled water. The split-spoon will then j = be lined with laboratory c3ganed brass tubes. Augers and drill bits will be steam cleaned with potable water between borings. Once the split-spoon has been driven into the ground and re- trieved, the spoon will be opened and two of the tubes will be rM removed. The ends of each tube will be covered with teflon sheeting and then capped with plastic end caps; these caps will be sealed to the tube by wrapping with an elastic tape such as electrical tape. The tubes will then be appropriately labeled, inserted into ziplock baggies and placed on ice in an insulated cooler for delivery to the laboratory within 24 hours of I I 10 - M. I �