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ITEM: |
CONSENT
CALENDAR |
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19. |
CONSIDER
ADOPTION OF RESOLUTION NO. 2019-09 AMENDING TABLE 4 OF RULE 25.5: HIGH
EFFICIENCY APPLIANCE |
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Meeting
Date: |
June 17, 2019
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Budgeted: N/A |
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From: |
David J.
Stoldt, |
Program/ |
N/A |
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General
Manager |
Line Item No.: |
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Prepared
By: |
Stephanie Kister |
Cost
Estimate: |
N/A |
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General Counsel Review: N/A |
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Committee Recommendation: The Water Demand Committee reviewed this
item on April 23, 2019 and recommended approval.
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CEQA Compliance: This action does not constitute a project as defined by
the California Environmental Quality Act Guidelines Section 15378.
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SUMMARY: The California
Plumbing Code allows for the reuse of treated rainwater and greywater for
flushing toilets and clothes washing. The Monterey County Health Department
requires a backup water supply from a reliable source to augment the
rainwater/Graywater system. The Water Demand Committee approved a reduced Water
use Capacity of 75% for toilet flushing in residential projects that
flush toilets with rainwater and/or Graywater systems. In granting a credit for a Graywater and rainwater toilet flushing
system, the District shall require metering on both the Graywater and the
Potable backup to the system, as well as annual reporting. The requirements shall be recorded as a
permanent requirement on the property title.
Resolution No. 2019-09 (Exhibit
19-A) would update Rule 24, Table 4 High
Efficiency Appliance Credits to reflect the credit.
RECOMMENDATION: Adopt
Resolution No. 2019-09 (Exhibit 19-A) with the Consent Calendar. The resolution would amend Rule 24, Table 4
High Efficiency Appliance Credits to allow for a reduced Water Use Capacity of 75% for toilet flushing in
residential projects that flush toilets with rainwater and/or Graywater systems.
BACKGROUND: In
2013 California Plumbing Code allowed for the reuse of treated rainwater and
Graywater for flushing toilets and clothes washing. New construction of hotels
and apartment complexes are best able to incorporate this technology in the
building design to reduce their water demand. The Monterey County Health
Department requires a backup water supply from a reliable source to augment the
rainwater/Graywater system. This can be done by installing dual plumbing to the
water fixtures or by adding an auto fill valve to the storage tank.
The District has received a request to reduce the Estimated Annual Water
Use Capacity for installation of a Graywater system to flush toilets in two
proposed Multi-Family Dwellings in Monterey.
Staff estimates that between 10 and 15 gallons of treated Graywater
(depending on the flush volume of the toilet) would be needed to meet the
toilet demands of an apartment with an average of 2.3 persons per
household. This demand would be easily
offset with Graywater generated from bathing (e.g., one ten minute
shower). Design of the system would need
to have adequate storage to meet demand for three days to ensure that the
Potable water backup would not be used.
A similar requirement would apply to a rainwater flushing system, which
would require significantly more storage to meet demands during the dry months.
Staff received direction from the
Water Demand Committee on Aril 23, 2019, regarding amendment to Rule 24, Table
4: High Efficiency Appliance Credits for Graywater and rainwater systems for
toilet flushing. This table can be amended by Resolution of the Board of
Directors. The Committee discussed
whether a complete offset of the toilet fixture count should be available, or
whether the fixture count should be reduced for these systems. The
Water Demand Committee agreed that a credit of 75% of the fixture unit count
for toilet flushing should be applied to residential projects that flush toilets
with rainwater and/or Graywater systems, and that Rule 24, Table 4 High
Efficiency Appliance Credits should also be amended to reflect the credit.
In granting a credit for a Graywater and rainwater toilet flushing
system, the District would require metering on both the Graywater and the
Potable backup to the system and annual reporting. The requirements shall be recorded as a
permanent requirement on the property title.
In addition, the Monterey County Health Department would also permit the
system.
EXHIBITS
19-A Draft Resolution No. 2019-09
19-B Attachment 1: Table 4
U:\staff\Boardpacket\2019\20190617\ConsentClndr\19\Item-19.docx