The goals of this pilot study are to determine how much free product only (no water) can be recovered on a daily basis from the pilot site formation and to observe the change in the radius of influence beyond skimming only.
Objective #1: "Establish a free product recovery rate baseline and radius of influence without vacuum enhancement.
I. REQUIRED EQUIPMENT:
1. Xitech product recovery system
2. Electronic Interface meter
3. Product holding tank
4. Air supply (bottled gas or air compressor)
5. Power supply (car battery or 110AC)
II. SET UP:
1. Install the Xitech product recovery system (refer to Manual).
III. OPERATION PROCEDURE:
1. Document the amount of time it takes to remove free product to a sheen.
2. Document the amount of time it takes for the free product to return to original static level.
3. Set the pumping time in minutes and cycles per day on the electronic controller to match the documented times in steps 1 and 2. Start the skimmer recovering product. NOTE: do not interrupt the skimming operation once the test has begun.
4. Record the amount of free product recovered in each 24 hour period. Record the change in product thickness in any nearby wells.
5. Operate the skimmer for 4-5 days.
Objective #2: Quantify the changes in recovery rate and radius of influence with the application of a low vacuum applied to the well.
I. ADDITIONAL REQUIRED EQUIPMENT:
1. Vacuum source, 75-100CFM
2. Dwyer gauges in inches of water
3. Volatile Organic portable analyzerII. SET UP:
1. Attach the vacuum source to the skimming well (refer to drawing).
2. Raise skimmer 1 foot in well without removing skimmer from well.
3. Double pumping time in minutes on the electronic timer. NOTE: DO NOT turn off the skimming operation during this set up.III. OPERATION PROCEDURE:
1. Apply 30 inches of water vacuum to skimming well.
NOTE: You may have to install a tee and air make-up valve to reduce the vacuum force to 30 inches of water.
2. Record the amount of free product recovered for each 24 hour period. Record the vacuum force in all surrounding wells. Record the VOC concentrations coming off of the exhaust air at the vacuum source.
3. Operate the VER system for 4-5 days.