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2012-09-06_REVISION - M2008070 (25)
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2012-09-06_REVISION - M2008070 (25)
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Last modified
6/15/2021 2:25:46 PM
Creation date
9/13/2012 12:29:01 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2008070
IBM Index Class Name
Revision
Doc Date
9/6/2012
Doc Name
AM-01 DESIGN & OPERATIONS PLAN, PROPOSED WASTE DISPOSAL FACILITY
From
WESTERN GRAVEL
To
DRMS
Type & Sequence
AM1
Email Name
THM
Media Type
D
Archive
No
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Design and Operations Plan October 24, 2011 <br />Western Gravel E & P Waste Disposal Facility Page 26 of 51 <br />• Portions of rainfall are stored in the operations layer and 12 -inch thick gravel leachate <br />drainage layer outside of the sump area. <br />Using this approach, the required volume of the sump in Cell A is 18,100 cubic feet (ft 3 ). The sump area is <br />shown on Figure 6, Detail 6A. The depth of leachate gravels in the sump area will range from 1 foot to 2 1/2 <br />feet in thickness as shown on Figure 6, Detail 6B. Sump design calculations are included in Appendix G. <br />A single, 12 -inch diameter HDPE (SDR 17) pipe that is 20 -feet in length and perforated with '/ -inch <br />diameter holes will be placed at the base of the sump area. A solid HDPE (SDR 17) 12 -inch diameter side <br />slope riser pipe will be connected to the perforated pipe section at the base of the sump area and extend up <br />the side slope to the top of the cell in order for leachate levels to be monitored, sample d, and when required, <br />allow leachate removal from the sump via pumping. A layer of 16 -oz non -woven geotextile will be placed <br />under the leachate gravels and HDPE sump pipes. A layer of 8 -oz non -woven geotextile will be placed over <br />the gravels in order to prevent fine soils from migrating into the gravels. A minimum protective soil cover of <br />at least 12- inches thick will be placed over the fabric within 30 days of installation. A minimum of 2 feet of <br />protective soil cover will be placed over solid side slop e riser pipe installed along the sidewall of the cell. <br />Details of the leachate sump, perforated pipe placement, and side slope riser pipe are provided on Figure 6, <br />Details 6B and 6C. <br />Materials used in construction of the LCRS shall meet the properties listed in the CQA/QCP. Construction <br />and testing procedures of these materials are provided in the CQA/QCP. <br />3.4.6.2 LCRS Operations <br />In accordance with Regulations Section 3.2.5(D), the LCRS is designed and will be constructed to maintain <br />less than a 12 -inch depth of leachate over the barrier layer and promote leachate transport from the most <br />distant point of the LCRS to the leachate removal system in less than a 12 month period assuming saturated <br />drainage media. Monitoring of fluid levels in the leachate collection sump will be conducted weekly during <br />spring months and initial stages of cell filling. In addition to monthly monitoring, the leachate sump level <br />will be measured after every significant rainfall of 1 -inch or greater or snowmelt event that occurs when a <br />leachate collection layer is exposed to precipitation. During inspection, leachate will be removed via <br />pumping based upon fluid levels. Typically, most pumps require a minimum fluid level of 1 foot to operate <br />efficiently; in no case will fluid in a sump be allowed to exceed a depth of 2 1/2 feet. <br />Based upon APCD regulations, collected leachate may be pumped from the LCRS and sprayed atop an active <br />landfill cell or disposed at an authorized disposal facility. In the event that leachate is spra yed on waste, <br />spray should not migrate beyond the cell boundary. Because of potential spray migration, this method of <br />leachate management may not be appropriate during windy conditions. <br />Whenever fluid is extracted from the sump for treatment and/or dis posal, a sample shall be collected and <br />analyzed for characteristic purposes. Leachate will be pumped directly from the sump into a truck - mounted <br />holding tank or steel, above ground storage tank (AST). If an AST is required, the tank will be located <br />within a lined area of underlying soils consisting of recompacted clays that exhibit low permeabilities (e.g <br />1x10 cm/sec to 1x10 -8 cm/sec). An alternative liner (e.g. HDPE) may be used instead of recompacted clays. <br />Earthen berms approximately 1.5 feet in height will be constructed around the AST in a manner where the <br />bermed area will contain the entire volume of the tank in the event of a liquid release. In the event of release, <br />liquid will be recovered using a pump and/or vac truck and transferred to an authorized treatment facility, the <br />LCRS, or sprayed on waste in an active cell. <br />The leachate may either be disposed of at a wastewater treatment facility or a disposal facility authorized to <br />treat and/or dispose of E &P and PCS wastewater, based upon chemical characteristics of the leachate. The <br />NWCC, Inc. <br />
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