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Page 4 <br /> degraders of long-chain hydrocarbons such as lubricating <br /> oil . The microorganisms present in both the contaminated <br /> soil and the mushroom compost should thoroughly degrade the <br /> TOG contaminants to form the non-toxic end products of <br /> carbon dioxide, minerals, and water within 4 to 8 weeks . <br /> Atmospheric oxygen will be supplied to the hydrocarbon- <br /> utilizing microorganisms in the treatment bed by piping <br /> placed within the bed�and through which air will be drawn <br /> using a vacuum pump. !.Soil moisture will be maintained by <br /> sprinkling the treatment bed with water pumped from the <br /> on-site well purge-water storage tanks after this water has <br /> itself been itself biologically detoxified (this would be <br /> accomplished by adding nutrients and pumping air into the <br /> storage tanks) ? <br /> During the course of the project , the treatment beds will <br /> be monitored for rates of degradation, moisture content , <br /> soil chemistry, and biological activity. Confirmation of <br /> the success of the treatment process will be through the fiJX ` <br /> collection and certified laboratory analysis of one <br /> discrete soil sample for every 20 cubic yards of soil <br /> treated. Each of the two discrete soil samples (one per <br /> every 20 cubic yards of contaminated soil ) will be acquired <br /> by driving a 1 . 9 inch diameter by 6.0 inch long clean brass <br /> tube into the soil until each tube is completely filled <br /> with consolidated material . Upon being withdrawn from the <br /> soil , the ends of each tube will be covered with teflon <br /> sheeting or aluminum foil , fitted with plastic caps , and <br /> sealed with duct tape. Each tube will then marked and <br /> placed within an iced, insulated container for trans- <br /> portation to Priority Environmental Labs under chain of <br /> custody. Certified analysis will subsequently be performed <br /> for Total Petroleum Hydrocarbons as Diesel (TPH-D) using <br /> EPA Methods 3550/8015, Total Petroleum Hydrocarbons as <br /> Gasoline (TPH-G) , benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX) using EPA Methods 5030/8015-8020, and Total <br /> Oil and Grease (TOG) using 5M 5520 D&F. <br /> The East Street site will remain fenced and the soil under <br /> remediation will be kept partially covered and sufficiently <br /> moist to preclude dust blowing into the shopping center <br /> located adjacent to the treatment area. <br /> As our goal is to reduce the levels of contamination to <br /> below laboratory detection limits , EPM requests permission <br /> to use the remediated soil as clean fill at 2360 East <br /> Street . <br /> Work will begin within two weeks of EPM's receipt of your <br /> authorization to proceed. All work will be performed under <br /> the direction of a Registered Civil Engineer in accordance <br /> W61 D0\ <br />