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Addendum to SVE Test Work Plan for SWMU B-3
Section 5 - Performance Schedule
The tasks to be performed as part of the second phase of this pilot test include:
Preparation of this addendum.
Preparation of subcontract modifications or bid packages for drilling, analytical, and land surveying services.
Drilling and sampling of soil borings for the collection of up to five confirmation soil samples.
Drilling and sampling of up to 12 soil borings and installation of VEWs in each boring.
An initial system check to evaluate the performance of the existing system.
Monitoring soil gas chemistry following system shut down to assess hydrocarbon recovery time and oxygen consumption.
Periodic testing of influence of at least three different configuration tests to determine the effective influence radius of each VEW.
Design and installation of an automated timer and moisture separator drain for the blower system, and
Preparation of a technical/treatability investigation report for the SVE pilot test, including an air emission exemption modification, a design for a short-term (up to one year) treatability test system, and a conceptual design for the full-scale treatment unit.
Routine monitoring of interim SVE treatment system following automation.
The schedule assumes that task 2 will be initiated prior to receipt of approval of this addendum, and that the field work associated with tasks 3 and 4 will be initiated within three weeks of receiving approval of this addendum. The anticipated schedule is depicted on Table 5.1. The drilling and construction activities are tentatively scheduled to require two weeks to complete.
The initial system check, task 5, will be performed immediately after drilling and construction phase of tasks 3 and 4 are completed. The blower system will be shut down at the end of the initial check and task 6 will be initiated. The schedule of the multiple configuration testing (task 7) depends largely on the time required for the soil gas chemistry in the B-3 trench to equilibrate after each test. The schedule shown on Table 5.1 assumes a recovery time of 30 days. Since each multiple configuration test will last at least two weeks, and with 30 days of recovery time required between each test, each test was assumed to require 45 days, or 135 days to complete all three multiple configuration tests. If the required testing period or recovery time is significantly different than the assumed interval, then the schedule will need to be adjusted accordingly.
The automated timer and moisture separator drain for the blower system will be designed (task 8) and the necessary equipment will be procured during the final multiple configuration testing. It will be set up based on the operating parameters and pulse schedule to be recommended in the technical report. The draft technical report will be submitted within six weeks after completion of all field activities. Preparation of the report will begin immediately after all test activities are completed. The final report will be submitted within 30 days of receipt of comments.