Laserfiche WebLink
d <br /> In Place Closure of Existing Supply and Return Lines <br /> After new pipelines are installed tested and connected to the backup fuel system,the existing <br /> underground supply and return lines will be closed in place as outlined here. Supply and return line <br /> closure in-place is proposed due to the abundance of utility and other patient related compressed gas <br /> line that pass over and along the existing pipe runs. In addition, portions of the supply and return lines <br /> to the backup generator and the boiler are located under reinforced concrete building pads and pass <br /> through support column footings and under concrete walk ways. <br /> The in-place closure procedure will consist of Wright personnel draining the lines of diesel fuel followed <br /> by flushing the supply and return lines with hot water and simple green cleaning solution. The final <br /> Rinsate will be purged with compressed air. All wash water and Rinsate will be placed in labeled, 55- <br /> gallon drums for disposal as a non-RCRA Hazardous Waste Liquid. Documentation for disposal will be <br /> provided to PHS-EHD. <br /> The supply and return lines will be closed in place after cleaning by filling the void with a pumpable <br /> mixture of cement, sand and water. This pumpable slurry mixture will consist of approximately six parts <br /> cement, two parts sand, one part bentonite and water as required to achieve a viscosity that is <br /> pumpable with a double diaphragm pump. After the pipes are pumped full, the pipelines where they <br /> now penetration through the concrete floor will be cut flush with the concrete floor and sealed as <br /> required with Quick Crete topping compound. <br /> Sampling under the closed in-place lines will take place under the direction of PHS-EHD inspector. <br /> Samples will be collected by hand auguring laterally from the new piping trench to a point below the <br /> existing pipeline alignment that roughly parallels the new pipeline alignment. Samples will be collected <br /> by Geoanalytical Laboratory a State Certified Laboratory and will be analyzed for Total Petroleum <br /> Hydrocarbons, as Diesel(TPH-D)and BTEX. <br /> Should additional information be required please contact John Lynch at Wright. <br /> 2 <br />