Castle Pines North WC Plan2007

• Project Type: Water Conservation Plan
• Applicant: Castle Pines North Metropolitan District
• Project Name: Water Conservation Plan
• Title: Castle Pines North Metropolitan District Water Conservation Plan
• Date: 8/1/2006
• County: Douglas
• Water Conservation - Doc Type: Complete Plan

CDM

Section 4
Proposed Facilities

Wastewater

The Plum Creek Wastewater Authority (PCW A) wastewater treatment facility was
recently expanded from 3.55 mgd to approximately 6.0 mgd. The plant is currently
permitted for 4.87 mgd, yet has the capacity to further expand. Construction of the
expansion began in October 2002 and was completed in July 2005. The facility serves
CPN, Castle Rock, Castle Pines Metro, Castleton Center, and Silver Heights. As
discussed in Section 3.3, potable demands within the District's service area are
estimated to be 2,000 AFY (does not include 240 AF of reuse for the Ridge Golf
Course) at buildout around 2011. Figure 4-2 shows effluent production vs well
production (not including the Ridge Golf Course) for 2004 and 2005. (Wastewater data
was not available prior to 2004). This trend shows the annual wastewater production
is approximately 40 percent of well production, resulting in an estimated 800 AFY of
wastewater at buildout. Given that the addition of surface water supplies is not going
to increase water supply, but rather replace non-renewable supplies, surface water
supplies will not significantly change water consumption or wastewater production
levels.

100
90
80
70
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~ 60
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0 50
~
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0: 30
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-=::t -=::t -=::t -=::t -=::t -=::t L[) L[) L[) L[) L[) L[)
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~ Well Production (Potable) - Wastewater Production

Figure 4-2
Well and Wastewater Productions

4.2 Incremental Cost Analysis

Table 4-3 shows the annual well production, the present value of supply costs in
nominal dollars, and the present value of supply costs per gallon. The average cost
per gallon for the 10-year planning period is $2.41/ gallon.

4-6

O:\Castle_Pines_North\Conservation Plan\Drafts Submitted For Review\Final Conservation Plan.doc