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<br />scarp areas, by the means of a riprap or reinforced soil slope buttress fill, or a soil nail wall. In addition
<br />to these improvements, Kumar strongly recommended the installation of an interceptor trench drain to
<br />collect seepage water in and around the areas of the slides.
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<br />DISCUSSIONS
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<br />Based on discussion between the various board members of the Company, and based upon review
<br />of the technical data calculated and presented by the two engineering firms, it was decided by the Company
<br />that the long term design alternative developed by Kumar and Associates was in their best interest. The
<br />alternative selected for construction was the nail wall and interceptor trench drain. The nail wall would
<br />consist of drilled and grouted steel bars placed on a 4 to 6 foot grid. The facing would consist of a grid of
<br />small reinforcing bars and wire mesh embedded in a shotcrete, with a geocomposite drainage strips placed
<br />behind the facing. The interceptor trench drain would consist of a I-foot wide by 8-foot deep trench with a
<br />6-inch perforated pipe placed along the bottom of the trench and backfilled with free draining gravel to a
<br />height of 4-feet and backfilled the remaining 4-feet with on-site soils.
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<br />Table 2 below is a comparison of the modified design project, versus the costs presented in the
<br />original feasibility study:
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<br />Table 2 - Cost Comparison
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<br />Item Oril!inal Cost Estimate Modified Proiect Cost Cost Difference
<br />1,060 l.f. 60" CSP $63,924 $63,924 $0
<br />Soil Nailing Failure Areas $38,000 $38,000 $0
<br />Water Tight Joint Bands $83,125 $83,125 $0
<br />Conc. Headwalls $20,000 $7,800 ($12,200)
<br />RemovelRegrade Slope $110,000 $0 ( $110,000)
<br />Failure Areas - Shotcrete
<br />Soil Nail Wall and $0 $154,400 $154,400
<br />Shotcrete Face
<br />Interceotor Trench Drain $0 $27,500 $27,500
<br />Revegetation, erosion $18,000 $71,580 $53,580
<br />control and seeding
<br />Mobilization $0 $22,000 $22,000
<br />Subtotal: $333,049 $468,329 $135,280
<br />Northwest Engineering $10,000 $10,000 $0
<br />Kumar Engineering $0 $25,000 $25,000
<br />Total: $343,049 $503,329 $160,280
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<br />FINANCIAL ANALYSIS
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<br />The total estimated cost of the revised project is $503,329, of which the Company is requesting a
<br />Construction Fund loan of $377,497, which is 75% of the total project cost. The Town is requesting an
<br />amendment to their existing $257,287 loan with CWCB in the amount of $120,21 0, for a new loan amount
<br />of $377,497.
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<br />3
<br />Flood Protection. Water Project Planning and Financing. Stream and Lake Protection
<br />Water Supply Protection. Conservation Planning
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