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Section 4 PROPOSED SCOPE OF WORK ' This project is designed to evaluate the effectiveness of injecting magnesium peroxide into the saturated and unsaturated zones in order to increase the availability of oxygen and enhance the biodegradation rates and reduce the mass of TPH in the source zone. tThe scope of work proposed for ' site include the following tasks: • Advance approximatel three boreholes t the area of vadose zone soil impacts around I' the former sump (see Figure 4) to a depth of about 20 feet and pressure inject Regenesis® ORC into the saturated and unsaturated zone. • Advance approximatel} 25 boreholes in the northeastern corner of the facility and four ' boreholes in the northwestern comer of the facility to a total depth of about 20 feet and pressure inject Regenesis® ORC into the saturated zone (Figure 4). Soil samples may be collected from selected boreholes for chemical analytical testing. • Install three 2 -inch diameter groundwater monitoring wells (MW -5, MW -6 and MW -7) and one 4 -ince h di eter gt n water extrac ton we I at the locations shown on Figure 4. • On a monthly basis monitor dissolved oxygen capon dioxide, redox potential, temperature an in groundwater at wells MW -1, MW -2, MW -5, MW -6 and MW -7. ' Oxygen in the vadose zone will be monitored using a buried 02 probe installed near the former sump. Additional ORC injections may be performed if oxygen levels are found to diminish to levels less than 1 ppm in the area of TPH impact. • On a monthly basis for th first three months 6d quarterly thereafter,coll samples at a point about 5orf m a VadU§Fzone ORC injection point and andyze the samples for total petroleum hydrocarbons, TEX_and redoxpotential. • Collec�groundwater samplesAnd depth -to -water measurements at monthly intervals. Groundwater samples will be analyzed for total petroleum hydrocaroon and BTEX compounds. If monitoring data suggests that biodegradation is not occurring in the vadose zone, an irrigation system may be constructed using water pumped from the on-site 4 -inch diameter extraction well. Nutrients in the form of a pelleted lawn fertilizer may be applied to the ground surface using a fertilizer spreader prior to starting the irrigation system. Alternatively, the fertilizer may be added to the irrigation system. --� • Prepare a summary report at the end of 1998, documenting the findings of the demonstration. 1 402_331-98_11 4-1