ARCHIVED REPORTS_1999 - Laserfiche WebLink

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The sides and top of the 48 inch vertical riser extending above the ash waste were strengthened with a minimum of 12 inches of steel reinforced concrete. An opening was cut on the southern side of the vertical riser to accommodate a 36 inch diameter concrete riser, positioned horizontally, to allow access from outside the waste management unit to the vertical riser and bottom collection sump. A foundation built from compacted ash was constructed between the vertical riser and the southern berm to support the 36 inch extension riser. The riser was placed on the ash foundation and sloped at about 1.5% to the south to allow drainage of condensate. A steel locking door was attached to the outside end of the extension riser to prevent unauthorized access to the leachate collection sump. Future construction on the Forward Ash Pit will involve building a sidewall liner along the existing western wall and extending the bottom clay liner and bottom leachate collection system. Vertical expansion will continue as needed along the southem and eastern berms of the ash pit, although no additional expansion is scheduled at this time.