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' • • KOPPEL STOCKTON TERMINAL <br /> WORK PLAN FOR MONITORING WELL INSTALLATION <br /> ' frequency be reduced to semi-annually for these three wells.Trends of concentrations will <br /> continue to be monitored with semi-annual data. Starting after the first quarter of 1999 it is <br /> ' proposed that all existing wells be sampled semi-annually. The sampling events during <br /> 1999 would occur during the first and third quarters and would occur during the second <br /> and fourth quarters during the year 2000. In general,the wells would be sampled in the first <br /> and third quarters during the odd-numbered years and during the second and fourth <br /> quarters during the even numbered years. It is proposed that all new wells be sampled <br /> quarterly for the first year and then semi-annually after the first year according to the <br /> ' alternating year scheme. It is proposed that the background well be monitored during the <br /> first two quarters proceeding installation. After the first two quarters of sampling, the <br /> sampling frequency for the background well will be evaluated. <br /> Soil Sampling <br /> In order to better define nitrogen concentrations in the soil, soil samples will be collected at <br /> 10 locations thoughout the Koppel site. The samples will be collected at depths of 1 foot, <br /> 2-feet,4-feet,and 6-ft-bgs. Four sample locations are targeted for the area north of the <br /> ' warehouse, three locations are targeted for the area east of the warehouse, and two <br /> locations are targeted for south of the warehouse. The samples will be analyzed for the <br /> constituents shown in Table 3. Proposed sampling locations are shown on Figure 2. <br /> TABLE 3 <br /> Analytical Methods for Soil Sampling <br /> Parameter Analytical Method <br /> Nitrate-Nitrogen Buffered Extraction EPA 353.3(M)/354.1(M) <br /> ' Ammonia-Nitrogen Potassium Chloride Extraction EPA/CE81-1 3-155 <br /> pH Saturation Paste USBR514.8.3 <br /> TKN Kjeldahl Digestion <br /> Schedule <br /> Well installation is targeted to be completed by the end of October 1998. This schedule will <br /> ' be followed unless offsite access agreements are delayed with the Port of Stockton or the <br /> BN&SF Railroad.Well permits will be obtained from San Joaquin County before well <br /> installation begins. It is expected that purge water from the new wells will be irrigated on <br /> ' the poplar grove at the Koppel StocktonTerminal site. Drill cuttings will be disposed of <br /> between the rows of the poplar trees at the site and worked into the soil during routine <br /> disking. <br /> ' RDD\E:\144002\FIELD INVESTIGATIOMNEW MW-SOIL WKPLAN.DOC 3 <br />