Specifications include, but are not limited to: 1. Runoff zone liner cleaning Contractor shall clean the runoff zone polypropylene geomembrane liners at Lined Dedicated Land Disposal (LDLD) 5 at the EchoWater Resource Recovery Facility (EchoWater Facility), 8521 Laguna Station Road, Elk Grove, California 95758. Cleaning shall include, but not limited to, removal of all dirt, mud, sand, harvested sludge, grass weeds, and other miscellaneous vegetation and debris. Cleaning shall include most areas of the runoff zone liners, including the floors and the sloped areas. Portions of the runoff zone are covered in a newer, black patch of Reinforced Polypropylene (RPP) liner – as opposed to the khaki-colored RPP liner elsewhere in the runoff zone. The new RPP liner is currently under warranty. Therefore, the cleaning and repair of the new RPP liner is not under this scope of work. Please refer to the site map, photographs, and drawings of LDLD5 runoff zone (Attachment 1, 2, and 3). Please also refer to the Maintenance Manual for the LDLD5 runoff zone liners (Attachment 4) for procedures and precautions when cleaning the liners, as well as descriptions of liner materials. Contractor’s bid will include a work plan detailing the equipment and methods to be used for cleaning the LDLD5 runoff zone liner. Contractor shall provide all equipment necessary for removal of materials from the runoff zone and conveyance to the adjacent LDLDs, or disposal offsite. 2. Protection of the liners, damage, and repairs It is of utmost importance that the liners not be damaged, including, but not limited to rips, tears, and punctures. This LDLD liner material and precautions against damaging it are described in the Maintenance Manual in Attachment 4. To avoid damaging and voiding the warranty of the new RPP liner, Contractor shall not step foot on, nor place any equipment on the surface of the new RPP liner. The contractor will be responsible for all damage to the liners incurred during cleaning. The District will inspect the liners after they are cleaned, on or about September 27, 2024 (see “Key Action Dates” in the RFB). Contractor will make repairs to the liners, as directed by the District, during the period for repairs between September 27, 2024 and October 31, 2024. Repairs shall be made as described in the Maintenance Manual (Attachment 4). The following precautions are from the Maintenance Manuals in Attachment 4. Contractor shall conduct operations in accordance with these precisions. Only rubber soled shoes should be used on the polypropylene liner. The soles shall be inspected prior to entrance onto the liner for embedded sharp objects such as metal shavings, rocks, glass, thorns, etc. Extra care is to be taken in the implementation of cleaning and maintenance processes to avoid damage to the liner. All equipment such as shovels, pumps, lights, blowers, vacuums, etc., shall have the bottom padded to prevent damage to the liner. No metal brooms or shovels are to be used for cleaning the liner. Dropping and/or dragging equipment and tools on lining is prohibited. All pumps and equipment should not have sharp projections or edges on them that may puncture the liner. Sharp edges on tools shall be removed and or padded. Gasoline, oils or other petroleum products should never be allowed to contact the polypropylene liner material. No metal brooms or shovels are to be used for the cleaning of the liner. The following methods are allowable: • Manual sweeping and pickup • Water wash down (low pressure) • Plastic grain shovels or plastic snow shovels • Other approved non-damaging methods. Dirt residue and other deposits can be removed from the liner by washing with a hose and letting water flow to the drain (sump). During cleaning remove water in certain areas by submersible pump and by broom and/or squeegee to facilitate rapid cleaning and draining of water off the liner. It is not recommended that the liner be walked on when wet. All persons going onto the liner should be advised that the liner will be very slippery when wet and to take extra care and precaution to protect against slippage. 3. Use of power equipment The O&M Manuals (Attachment 4) do not mention the use of power equipment to clean the runoff zone liners. Contractor may propose the use of power equipment that in their judgment, after viewing the liners during the Pre-bid Meeting on July 2, 2024, will not damage the liners. In such case, Contractor will explain in their bid why the power equipment will not cause damage to the liners, including but not limited to cuts, tears, punctures, and abrasion. Approval of the use of such equipment will be at the sole discretion of the District.
