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• • KOPPEL STOCKTON TERMINAL <br /> WORK PLAN FOR MONITORING WELL INSTALLATION <br /> ' TABLE 1 <br /> Proposed Monitoring Well Construction <br /> Proposed Screened Intervals Proposed Total Depth <br /> Well Name (n-bgs) (feet below ground surface) <br /> KP-BG1 10 to 20 22 <br /> KP-5S 10 to 20 22 <br /> KP-7S 10 to 20 22 <br /> ' KP-8S 10 to 20 22 <br /> KP-5D 45 to 55 57 <br /> ' KP-61D 45 to 55 57 <br /> KP-7D 45 to 55 57 <br /> aFor the proposed deep wells,the screened interval will be 10 feet between the interval from 45 to 60 feet bgs. <br /> ' Water Quality Sampling <br /> It is expected that each of the new wells will be sampled for the constituents shown in <br /> Table 2. Field parameters of pH,electrical conductivity,dissolved oxygen, temperature,and <br /> Eh will be measured during sampling. The dissolved oxygen,Eh,and pH measurements <br /> will give an indication of in situ conditions that could affect rates of natural attenuation of <br /> t the nitrate and ammonia concentrations at the site. <br /> During drilling of the deep wells,hydropunch samples will be collected in the proposed <br /> deep screened interval location. The samples will be analyzed in the field for nitrate and <br /> ammonia to give an indication of the insitu concentration of the nitrogen constituents. <br /> Hollow-stem auger drilling will proceed to just above the proposed screened interval and <br /> then a hydropunch sampler will be pushed into the borehole up to 5 feet in advance of the <br /> ' drill bit. A sample will be collected and analyzed in the field to determine the nitrate and <br /> ammonia concentrations.The field results will be used to determine the final screened <br /> interval for the deep wells. <br /> TABLE 2 <br /> Analytical Methods for New Monitoring Wells <br /> ' Parameter Analytical Method <br /> TDS EPA 160.1 <br /> Nitratea EPA 353.3 <br /> Ammonia EPA 350.2 <br /> TKN EPA 351.3 <br /> ' Analytical methods are from U.S. Environmental Protection Agency(EPA), 1983. Methods for Chemical Analysis <br /> of Water and Wastes. EPA Manual 00/4-79-020. <br /> ' aField filtered to reduce suspended solids. <br /> Parameters of pH,conductivity, dissolved oxygen,temperature, and Eh will be monitored in the field. <br /> Reduction in Monitoring Well Sampling <br /> ' Existing monitoring wells KP-2,KP-3,and KP-4 have been monitored quarterly since 1996. <br /> A total of eight samples have been collected. Because concentrations or trends have <br /> ' remained relatively stable for KP-2,KP-3 and KP-4, it is recommended that the sampling <br /> RDD\E:\144002TJELD INVESTIGATIIXJWEW MW-SOIL WKPLAN.DOC 2 <br />