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APACHE PLASTICS, L. P. 2050 E . Fremont St. • P.O. Box 5127 • Stockton, CA 95205-0127 • 20914664356 • 8001527-2243 • FAX 2091466-1730 October 19, 1995 Mrs. Diane Hinson Public Health Services Environmental Health Division P . O . Box 0388 Stockton, CA 95201 -0388 Dear Mrs. Hinson: This letter is to just give you a status report of our remediation project. during the month of August. As we discussed, I left the vapor extraction unit shut down du g gu Since I restarted the unit in September, it has been impossible to keep running at the same flow rate as before the extended shutdown (I sometimes have had to restart the unit 4 or 5 times per day because the unit misses and stumbles when it is pulling from the wells). I consulted with VR Systems last week who' s theory is that during shutdown the natural "bugs" became more active creating a more active degrading process (possibly promoted by my injecting air into the wells periodically during the shutdown), creating more carbon dioxide at a faster rate than before shutdown. I asked VR Systems' representative if in the de past month and a half the carbon dioxide should have been depleted mostly and shouldn't the carburetor be closing now indicating that fresh oxygen is being pulled into the unit. The answer was that they have experienced times where the degrading process is going so good that the carbon dioxide is being produced faster than the vapor extraction unit can pull it out, and that the fresh air that is being pulled into the radius of influence actually causes a chain reaction type situation promoting the degrading process. This is good if it is factual. I have recently learned that I can keep the vapor extraction unit running if I create a false vacuum with the well ball valves and have been able to very slowly increase the flow rate while doing so. If you feel that it has merit, we can sample the vapor and have it analyzed for carbon dioxide and oxygen percentage to verify the VR System theory.