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' • • 3.OMONITORING <br /> TABLE2 <br /> Monitoring Recommendations <br /> Koppel Stockton Terminal <br /> Monitoring Current <br /> Well Frequency Proposed Frequency Comments <br /> KP-1R Quarterly Annually starting 1000 Trends are established <br /> KP-2 Quarterly Annually starting 1000 Trends are established <br /> KP-3 Quarterly Annually starting 1 Q00 Trends are established <br /> KP-4 Quarterly Annually starting 1000 Trends are established <br /> KP-5S Quarterly Semi-annually starting 1Q01 Trends will be established <br /> KP-51) Quarterly Semi-annually starting 1001 Trends will be established <br /> KP-613 Quarterly Semi-annually starting 1001 Trends will be established <br /> KP-7S Quarterly Semi-annually starting 2000 Offsite well <br /> KP-7D Quarterly Semi-annually starting 2000 Offsite well <br /> KP-8S Quarterly Semi-annually starting 2000 Offsite well <br /> KP-9S Quarterly Semi-annually starting 2000 Offsite well <br /> KP-11G-1 Quarterly Semi-annually starting 2000 Offsite well <br /> TG-1 Semi-annually Semi-annually Test grove well <br /> TG-2 Semi-annually Semi-annually Test grove well <br /> TG-3 Semi-annually Semi-annually Test grove well <br /> It is proposed that new piezometers will be sampled semi-annually. <br /> 1 3.2 Soil Monitoring <br /> Soil sampling has been performed at the existing test grove as well as numerous other loca- <br /> tions on site. Results are summarized in the FS (CH2M HILL,2000a). <br /> A composite soil sample will be collected from a circular area with a diameter of 35 feet <br /> from each of the four new poplar grove areas.Within each circular area,borings will be <br /> advanced using a hand-auger at eight locations to a total depth of 6 feet. Soil samples from <br /> each boring will be divided into three depth intervals,0 to 2 feet,2 to 4 feet, and 4 to 6 feet. <br /> The eight samples from each depth interval will be composited and submitted for analysis. <br /> Constituents to be evaluated in soil are nitrate-nitrogen,ammonia-nitrogen,and pH. <br /> A statistical review of this soil data from this site shows that while nitrogen concentrations <br /> in the soil are generally stable or diminishing,the soil data is highly variable with respect to <br /> both time and location,and that actual trends in soils takes several years to develop. A <br /> 1 detailed discussion of these findings is provided in the Feasibility Study(CH2M HILL, <br /> 2000a).Therefore,it is proposed that soil sampling be performed at 5-year intervals to assess <br /> the success of phytoremediation in soil.At or near the time of planting,soil samples will be <br /> ' collected from all planting areas except the existing grove to provide a baseline for soil data. <br /> RDD/003670317.DOC(CAH710.DOC) 14 <br />