Grand Junction Retrofit WorkPlan

• Project Type: General OWC
• Applicant: City of Grand Junction
• Project Name: Residential Retrofit Pilot Project
• Title: Project Summary
• Water Conservation - Doc Type: Work Plan

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PROJECT IMPLEMENTATION
1. Residential Participation - A sample size of 96 single family
homes was determined as a minimum number for participation. The
size was calculated with 95% confidence that the sample size water
use average varies no more than 10% from the population water use
average. This level of confidence is for sample size determination
only and not to be confused with the confidence in data analysis.

Methodology - A letter requesting project participation will be
mailed to 1,000 single family customers to ensure that responses
are adequate to reach the desired sample size. Typical survey
responses fall in the range of 12-15% returns. Assuming a similar
response, the desired sample size should be easy to achieve from a
mailing to 1000 customers.

A random sample of 1,000 single family customers will be generated
from the Grand Junction computerized billing records. The mailing
will specify criteria that all households are to meet and also
point out savings benefits from participation. criteria required of
participating homes will include (1) home ownership (2) no water
efficient devices in place (3) consent to have utility bills
monitored (4) agreement to have devices remain installed for the
duration of the study.

Responses for participation and subsequent selection of homes for
participation may well exceed the minimum required households. If
this happens, homes not included in the study will be provided with
water conservation literature and tips. This group may also be
asked to participate in a future program.

Homeowners agreeing to participate in the project may be
predisposed to water efficient habits and therefore skew the
resul ts. To determine if there are any differences between the
participants and households that do not respond, a survey will be
conducted from a random sample of the non-responding households.
The survey will collect general household information, attempt to
determine existing water use habits and will be used to compare
with the project participants.

2. Project Devices - The devices for project use will be the
Future Flush, a dual flush toilet device, the ShowerSpa 2000 and
2001 showerhead, and a faucet aerator. These devices will help
provide information on the effects of both energy and water usage.

Donations will be made from Con-Tech Industries, manufacturers of
Future Flush, and Energy Technology Laboratories, manufacturers of
the ShowerSpa 2000 and aerator. The donation of devices assumes 70%
of the sample homes will have two bathrooms and all will be
retrofitted with both devices. Devices will be delivered to Grand
Junction when a total count of needed fixtures is determined.