WORK PLANS CASE 2 - Laserfiche WebLink

Home Browse Search

Adak ' k' ■ KL EI N F E L D E R ' 5.3. TASK2-DRILLING OF SOIL BORINGS AND MONITORING WELL INSTALLATION Four (4) soil borings will be advanced to depths of approximately 30 feet bgs. During the advancement of the borings, soil samples will be collected at five foot intervals for lithologic classification. Lithologic classification will be based on the Unified Soil Classification System (USCS). After collection, the soil samples will be labeled, logged on a chain-of-custody, and immediately ' stored in an iced cooler. In an attempt to establish a baseline level for certain analytes in soil, the soil sample obtained from a depth of 5 feet bgs in each monitoring well boring would be analyzed for the following: ' Nitrate (as N) by EPA Method 300.0 Ammonia(as N) by EPA Method 350.3 Total Kjeldahl Nitrogen (TKN) by EPA Method 351.2 ' The samples will be analyzed on a normal laboratory schedule requiring approximately two weeks (ten working days) for completion unless the optional rush analytical turnaround is requested by the client at an additional charge. ' Following completion of the drilling, a 2-inch diameter PVC well will be installed in each of the borings. The well will be constructed as described in Appendix A. The wells will be surveyed for well location and elevation above mean sea level(msl) so that subsequent water level sounding data can be utilized in determining groundwater flow directions and gradient as described in Appendix A. ' 5.4. TASK 3 - MONITORING WELL DEVELOPMENT AND SAMPLING Forty-eight hours after installation, the new wells will be developed to remove sediment-laden water and to increase the hydraulic radius of each well. Development will be performed as described in Appendix A. Water level measurements will be made in the wells prior to development, and at the beginning of the sampling round prior to purging and sampling the wells. The depth to groundwater will then be measured in each well according to the protocol described in Appendix A. The depth to groundwater measurements will then be converted to relative groundwater elevations with respect to mean sea level or a local benchmark by subtracting them from the surveyed casing elevations. The resulting groundwater elevations will be used to assess the direction of the groundwater ' gradient at the time of sampling. This information can then be used to assess which wells represent upgradient and which wells represent downgradient groundwater conditions. 20-4587-OI.WPI/201 IP128 Page 7 of 12 Copyright 2001,Kleinfelder,Inc. May 8,2001