Transcript Environmental Health Ground Water in Hard Rock

MONTERY COUNTY
2005 GENERAL PLAN UPDATE
STUDY SESSION
INFRASTRUCTURE REVISIONS
July 7, 2005
CIRCULATION
LEVEL OF SERVICE
(Board Direction)
LEVEL OF SERVICE (LOS)
PERFORMANCE STANDARDS
1.
LOS C is the standard with specified exceptions:
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2.
Rural/Agricultural Lands: LOS D where necessary to directly
support urban development within the Community Areas.
Community Areas: LOS D or where a lower LOS may be
determined through the Community Plan process.
State Highways and Regional Corridors: LOS D (All State
Highways, G 12-Highway One to 101, Salinas to Marina
Corridor, and G16-Highway One to Carmel Rancho Blvd)
Existing LOS D or E Roads: Where LOS has already degraded
to LOS D or E no further degradation in LOS will be allowed.
Carmel Valley Road: CVMP Policy 39.3.2.1.
LOS standard is anticipated for buildout of the General
Plan.
WATER RESOURCES
NO REVISIONS PROPOSED
DOMESTIC WATER AND
LAND USE PERMITTING
PRIVATE WELLS FOR
DOMESTIC USES
(Existing lots of record)
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1. All new wells for domestic uses located in
consolidated materials ( i.e. hard rock areas)
must meet minimum quantity requirement of 3
gpm after a 72-hour pump test. In hydrogeologic
areas where data has been previously developed,
the pump test may be reduced. If the pump test is
less than 3 gpm, then the Division of
Environmental Health may consider site-specific
data that provides a reasonable assurance that a
long-term water supply will be available.
DEPARTMENT OF HEALTH
DIVISION OF
ENVIRONMENTAL HEALTH
WELL PRODUCTIVITY IN
FRACTURED HARD ROCK
WELL PRODUCTIVITY
IN FRACTURED HARD ROCK
Public Health Reasons for Minimum
Standard of 3 gpm for New Private Wells
 Reasonable Assurance for Long Term Water
Supply for Basic Sanitation Needs Such as:
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Potable Drinking Water;
Flushing of Waste;
Washing of Hands, Showering and Bathing;
Food Preparation and Cleanup;
Janitorial Cleanup Around the House for Basic Sanitation
WELL PRODUCTIVITY
IN FRACTURED HARD ROCK
RECHARGE
 The Majority of Groundwater Recharge in Hard Rock Areas in Monterey
County is by Rainfall.
 Monterey County Routinely Experiences Multiyear Droughts.
WELL PRODUCTIVITY
IN FRACTURED HARD ROCK
RECHARGE RATES
Monterra Ranch
Rancho San Carlos
Canada Woods
3 Bedroom SFD Basic Sanitation
Including Other Water Uses
.21 AF/ac
.25 AF/ac
.22 AF/ac
.33 AF/Yr
.46 AF/Yr
Recharge Rates Indicate 1.3 – 2+ Acres Would Be Needed Based
on Infiltration Capacity Alone.
Department of Water Resources has Recommended 3 - 5 acres
Larger Lots Allow Flexibility for Replacement Wells Especially in
Conjunction with Setbacks from Septic Systems.
WELL PRODUCTIVITY
IN FRACTURED HARD ROCK
SURFACE INFILTRATION CAPACITY
Rainwater Percolates Through Soil to Recharge Fractures.
Large Surface Area with
Natural Surface:
More Infiltration Capacity.
Limited Surface Area (Small
Lots) with Hardscape:
Limited Infiltration Capacity
WELL PRODUCTIVITY
IN FRACTURED HARD ROCK
Water Storage Capacity
Water is Stored in Fractures That Results in Reduced
Storage Capacity:
Hard Rock Storage: <2% of Rock Volume, Decreases with depth
100 cubic feet of Fractured Rock = 1.5 gallons or less
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Alluvial Storage: 10% to 25% of Aquifer volume
100 cubic feet of Alluvium = 7.5 gallons – 18.75 gallons
WELL PRODUCTIVITY
IN FRACTURED HARD ROCK
FACTORS INFLUENCING WELL
PRODUCTIVITY
Unfavorable
Favorable
Orientation Of
Fractures
Wells intersect few
steeply dipping fractures
Wells intersect many
gently dipping fractures
WELL PRODUCTIVITY
IN FRACTURED HARD ROCK
FACTORS INFLUENCING WELL
PRODUCTIVITY
Unfavorable
Favorable
Width of
Fractures
Soil Cover
Can Provide
Some Storage
WELL PRODUCTIVITY
IN FRACTURED HARD ROCK
FACTORS INFLUENCING WELL
PRODUCTIVITY
Unfavorable
Favorable
Density of Fractures
Interconnection of
Fractures Over a
Large Area
WELL PRODUCTIVITY
IN FRACTURED HARD ROCK
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LOCAL AND STATEWIDE EXPERIENCE
Local Problems with Significant Decrease in
Well Productivity.
Statewide Problems with Significant Decrease of
Well Productivity.
Department of Health Services, Department of
Water Resources Acknowledge Well
Productivity Can be Problematical Due to the
Factors Affecting Water Production.
Eight of the Counties Surveyed Require 3 gpm
or Greater as a Minimum Standard.
WELL PRODUCTIVITY
IN FRACTURED HARD ROCK
Environmental Health Recommends
 3 gpm as a Minimum Standard After a 72 Hour
Pump Test.
 <3 gpm Would Be Considered For Larger Lots
As Well as Other Hydrogeological Factors.
PRIVATE WELLS FOR
DOMESTIC USES
(Existing lots of record)
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2.
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4.
Bulk hauled water is not considered an approvable supply for new
construction.
As a baseline, new development on existing lots of record must have
a determination of water quality via a one time biological and
chemical analysis of primary and secondary constituents. A
noticing process would be required so that future owners of the lot
would be informed of the water quality. Other Requirement of
deed notice if standards are exceeded. Other counties currently
require this initial biological and chemical constituent test. Staff
will work with County Counsel and the Board of Realtors to
develop the most reliable approach for ensuring notice to future
owners regarding the potential exceedance of standards.
Continue the requirement that construction of a well on any lot with
an onsite wastewater system, must be a minimum of 2.5 acres
WATER SYSTEMS
5.
6.
Consolidation of new development water systems with
existing utilities would be encouraged required in
community areas and rural centers. The County shall
also encourage the In all other planning areas, the
formation of new mutual water systems would be
discouraged by requiring the creation of satellite
systems owned and operated by existing entities (i.e.,
PUC Utilities, Community Service Districts) where
feasible with the appropriate Technical, Managerial and
Financial, (TMF) feasibility assurances.
To assure water quality and improved basin-wide
management of groundwater resources, water system
owners and purveyors must retain all water rights for
new lots created through minor and standard
subdivisions.
LAND USE PERMITTING
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7. The County shall continue to require that new
development have a long term sustainable water supply in
order for a project to be approved. This shall not be a
factor in determining a project complete, but will be a
critical factor in determining whether a project may be
approved. The County shall also continue its policy of
considering a project complete once the applicant submits
a hydrogeologic report or otherwise complies with the
requirement to submit information regarding adequacy
and quality of the water supply.
LAND USE PERMITTING
8.
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Long Term Sustainable Supply should be determined on
a basin by basin basis. Examples based upon current
information are as follows:
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Projects in Zone 2C shall be considered to haves a long term
sustainable supply
Projects in basins under the purview of the Pajaro Water
Management Agency shall be evaluated in terms of the
implementation of that agency’s CIP
Projects in the area managed by the Monterey Peninsula Water
Management District shall be governed by State Order 95
The Seaside Basin shall be considered not to have a long term
supply at this time
Long term supply in the Toro Basin (t.b.d.)
LAND USE PERMITTING
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9. As part of the determination of long term supply
for individual projects, the County shall evaluate
encourage the reduction of water usage on a
property in the permitting process. For the
purpose of determining baseline, documented
water usage for 10 out of the past 20 years shall be
calculated. A range minimum of from 20% to 30%
savings over baseline shall be required. is
proposed as appropriate for achieving savings to a
basin that has water supply deficiencies.
LAND USE PERMITTING
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10. Water quality shall be a key additional
determinant of long-term sustainable supply.
11. A will serve letter from an existing water
purveyor verifying that financial and
infrastructure commitments have been
completed will also be required.
12. In Community Areas, regional impacts may be
addressed via impact fees tied to a CIP for new
development.
LAND USE PERMITTING
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13. Outside Community Areas:
a)
Require Encourage connection to a
water system or establishment of a satellite to an
existing water system that has the appropriate
TMF.
b)
Regional impacts may be address via
impact fees tied to a CIP for new development.
However, outside community areas the CIP shall
have Tier2 priority.
WASTEWATER TREATMENT
AND DISPOSAL
14. Require new development to consolidate wastewater
collection, treatment and disposal systems of services,
connecting to existing systems where feasible. The
county shall not allow the use of package plants when
connection to a regional facility is feasible.
15. Proof of wastewater sewage feasibility prior to deeming
the application for development complete. Wastewater
requires all TMF requirements to be evaluated and
completed satisfactorily.
16. Wastewater facilities must be built and approved prior to
the issuance of building permits.
17. Wet weather storage for treated sewage effluent of 120
days is required. (current policy)
18. A minimum lot size of one acre will be required for
septic systems that are served by a water system.
SOLID WASTE
19. The county shall adopt the Landfill
Buffer Zone Ordinance The General
Plan should clearly indicate the need for
appropriate buffers between landfills
and development. A subsequent
ordinance will implement this principle.
INFRASTRUCTURE
ELEMENT
DEFINITIONS
ADEQUATE PUBLIC
FACILITIES AND SERVICES
(APFS)
• means the public facilities and services
required to support new development so
that new development does not adversely
impact current service or safety levels
below established minimum standards.
CONCURRENCY
• (Subdivisions) means that prior to recording the parcel map or final map that:
– all direct on-site and direct off-site public facility and public service
improvements to serve the development and feasibly mitigate its impact
on existing public facilities and services exist, are constructed, assured or
otherwise secured in a subdivision improvement agreement; and,
– the fairshare contributions to feasibly mitigate indirect off-site public
facility and public service impacts have been made or are assured or
otherwise secured in a subdivision improvement agreement.
• (Other Development) means that prior to the issuance of building permits that:
– all direct on-site and direct off-site public facility and public service
improvements to serve the development and feasibly mitigate its impact
on existing public facilities and services exist have been completed to the
extent that their completion is assured prior to occupancy of any portion
of the development; and,
– the fairshare contributions to feasibly mitigate indirect off-site public
facility and public service impacts have been made or are assured or
otherwise secured.
APFS IMPROVEMENTS
• Direct On-Site; means the improvements on the
development site necessary to fully serve the
development and feasibly mitigate the on site impacts
of the development.
• Direct Off-Site; means the improvements off the
development site necessary to fully serve the
development and feasibly mitigate the off site impacts
of the development .
• Indirect Off-Site; means the public service and
facility improvements needed off the project site to
feasibly mitigate the off site incremental impacts of
the development.
FAIR SHARE
• Staff Recommendation; means the contribution a new
development is required to pay for indirect off-site APFS
improvement proportionate to its impact on the public facilities
and services without assessment for existing APFS deficiencies.
• Refinement Group: Means the proportional share attributable to
a new development project of the cost of providing additional
service facility capacity necessary for the new development
project to meet adopted service level standards for that service
facility. Fair Share is that portion of the cost of providing such
additional service facility capacity, excluding the cost of
remedying any existing capacity deficiencies in that service
facility, calculated as the ratio between the burden placed on the
service facility by the new development project, and the total
burden on that service facility from existing development, the
proposed new development project, and all reasonably
anticipated cumulative development.