WORK PLANS - Laserfiche WebLink

Home Browse Search

Kennedy/Jenks Consultants downwards toward the valleys. The thickness of the clay liner on the bottom of the ponds is a minimum of 24 inches at the valley positions and 36 inches at the ridge positions. 2.2.3 Leachate Collection and Recovery System The floor of each surface impoundment was constructed with ridges and valleys to form the base for the LCRS. The ridges and valleys traversing the short dimension of the impoundment base are sloped at 0.4 percent to allow any liquid to drain toward northeast side of the impoundments as part of the LCRS design. Four-inch-diameter perforated polyvinyl chloride (PVC) pipes were installed on top of the clay liner within the valleys and were surrounded with filter gravel and a geotextile filter fabric wrap. The four-inch perforated pipes drain to a six inch perforated collector pipe that transports liquid to one of four LCRS sumps. Two sumps were constructed for each impoundment; one in the northwest corner and one in the southeast corner. Each sump is equipped with a ''/2-horsepower submersible pump to convey collected liquid back into the surface impoundment. Small diameter perforated pipes connected to vertical piping was installed under the synthetic liner layer to allow air to be vented to atmosphere. A free-draining granular media was placed on top of the clay liner and leachate collection piping to a depth of six inches at the ridge positions and 12 inches at the valley positions. A geomembrane drainage mat with a geo-fabric backing was placed on the clay liner of the side slopes to direct potential leakage from the side slopes to the leachate collection piping system. The LCRS system of each surface impoundment was tested at the time of installation. For the first surface impoundment constructed in 1986, testing was performed by introducing water into the air venting pipes and monitoring collection of the water in the sumps. For the second impoundment constructed in 1991, water was sprinkled onto the surface of the granular media prior to installation of the synthetic liner and retrieved from the sumps. 2.2.4 Synthetic Liner Both surface impoundments were entirely lined with a Hypalon reinforced chlorosulfonated polyethylene synthetic liner. The synthetic liner forms an impenetrable layer over the LCRS and was secured by burying the ends in an anchor trench at the top of the embankments. According to KSA, "Extensive testing conducted on Hypalon liners for use in salt gradient solar ponds indicate that Hypalon is very compatible with brine solutions and will perform very well in this application." (Kjeldsen, Sinnock&Associates 1986a). Several features are incorporated in the impoundment design to minimize the potential for leakage at the influent points. A 45-mil shroud was clamped to the inlet pipe and bonded to the liner to protect against leaking at the pipe penetration of the synthetic liner. A concrete pad four feet wide and four inches thick was constructed below the pipe inlet as a splash pad to prevent scouring. A 45-mil splash pad liner was bonded to the concrete and joined with the synthetic liner. Page 4 Work Plan for Improved Detection Monitoring Program Musco Family Olive Company, Tracy, California a -,o�o,ammpbnznzo�oam_m��r�,es.,e,"W_27_dmp�pai da..mlreporttext-09-26.doc