1 - the Envirostor

1.6, Section 07115, Subsection 1.4 and 1.5, specific methodology for liner
placement field scanning, and placement of boots for monitoring wells,
telephone poles, guide wires, fence posts, and other structures penetrating
the liner were prepared by Canonie with cooperation and information from
Nilex. This information was submitted to DHS two weeks before liner
installation and is included as Appendix D.
Upon delivery, the HDPE liner was stored in the area shown on Figure 4.
When it was determined that the drum yard subgrade was completed, the liner
was removed from the storage area and placed onto the drum yard using an
extended arm crane. The 1 iner was rolled out and placed into position by
laborers. A Nilex field technician then fused the sheets of HDPE together
as per the working details that Nilex had provided. Nilex suggested that a
better seal around the monitoring wells could be achieved if the concrete
utility boxes were replaced with sono tubes. This would allow the
performed pipe boots to be used instead of using a field weld. This method
was determined to be acceptable by Canonie, DHS, and CH2M HILL so long as
the utility boxes were replaced and accessiblity to the monitoring wells
maintained. Plans were made for utility box replacement so that the sono
tubes could be used.
Field vacuum testing and laboratory destructive testing of the liner seams
were performed. Any seams that proved to be inadequately welded were re-
welded and tested again to insure their integrity.
2.6.2 Concrete Placement
The placement of the concrete curb and catch basin conformed to Section
03300 of the Construction Specifications and as is shown on the
construction drawings. The concrete curb was placed and allowed to cure
five days before placement of final subsurface cover material and HDPE
liner. The existing curb around the sump was removed and the sump
backfilled with concrete so that the newly constructed curb could be
extended over the sump. After the curb had been cured, the HDPE liner was
fastened to the curb with Hilti concrete anchorages.