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MARIN COUNTY PLANNING COMMISSION RESOLUTION NO.
A RESOLUTION APPROVING THE MARIN HORIZON SCHOOL USE PERMIT AND DESIGN REVIEW
305 MONTFORD AVENUE, MILL VALLEY ASSESSOR’S PARCEL 047-161-07
* * * * * * * * * * * * * * * * * * * * * * * *
…
30. Stockpiling of excavated soil, debris, sand, or other materials during construction shall be watered and/or covered. Upon completion of grading activities, stockpiled areas shall be seeded, covered, landscaped and/or watered with an appropriate dust palliative or suppressant, such as EPA approved biodegradable “Ek35” or “Soiltac®” added to the water prior to application. Containment berms and silt fencing may also be required as directed by the Marin County Department of Public Works staff subsequent to routine field inspections of the site.
SECTION I: FINDINGS
The building would have the following minimum property line setbacks: 19.5 feet front (north); 15 feet side (west); 170 feet side (east); and 170 feet rear (south). The project also includes a proposal to increase the permitted number of students enrolled in the school by 50 students, from a maximum of 250 students to a maximum of 300 students; increase staff levels from 44 Full Time Staff Equivalent (FTE), comprised of 31 full time and 16 part time employees, to 49 FTE comprised of 44 full time and 10 part time staff; construct a new stepped terrace along the western side property line; construct 14 new parking spaces on the southern portion of the playground for a total of 49 parking spaces; construct a new transformer 11 feet from the front property line facing Montford Avenue; demolish 10 feet of building located adjacent to the driveway access on the south side of the property; construct an additional pedestrian emergency walkway from the third floor to Montford Avenue; remove two redwood trees, one Monterey pine tree, one strawberry tree, and one fir tree; and install new landscaping.
The project also includes an Encroachment Permit to allow existing diagonal striping for the passenger loading area along Melrose Avenue to extend 2 feet into the street right-of-way. The additional encroachment into the right of way is to provide for a wider pedestrian way between the school building and the passenger drop-off and pick-up area for safety reasons. No change to the length of the passenger loading area is proposed.
Land Use Changes
The proposed land use changes include modifications to the school’s 1993 Use Permit to: (1) increase the enrollment from 250 to 300 students, and to (2) increase the staff from 44 FTE to 49 FTE. No change to the number of special non-instructional events in the evening is proposed.
Table 1 outlines the proposed changes. (The proposed changes to the 1993 Use Permit are bolded.) In order to clarify and provide additional specificity to the proposed project the sponsor has submitted a detailed month-by-month matrix of the number and type of non-instructional events and the corresponding maximum on-site population levels.
TABLE 1: PROPOSED SCHOOL USE
ACTIVITY |
Existing Use Permit |
Proposed Use Permit |
School Year |
|
|
Maximum Students (Pre-K to 12) |
250 |
300 |
Maximum Staff |
44 FTE |
49 FTE |
Permitted hours of operation for school, and enrichment classes |
7:30 A.M. to 6:00 P.M. |
No change |
Day Care |
7:30 A.M. to 8:30 A.M. 3:15 P.M. to 6:00 P.M. |
No change |
Non-Instructional Activities |
|
|
Special during school day events |
7 events |
14 events per year |
Special weekday evening events |
36 events per year |
No change |
SUMMER SCHOOL (June 15 to August 15) |
|
|
Permitted hours of operation |
9:00 A. M. to 3:00 P.M. |
No change |
Physical Improvements
The proposed physical improvements for the Marin Horizon School include modifications to existing buildings and facilities, demolition and removal of existing buildings, and construction of new buildings. The proposed improvements include:
The new building would hold 11 classrooms: 8 classrooms for the 4th to 8th grades and 3 specialized classrooms for music, science and a foreign language studio. Demolishing the existing middle school building would eliminate 6 of the existing K-8 classrooms. Thus with the new building, the school is gaining 5 additional classrooms.
The proposed on-site parking areas would be redeveloped and expanded by 14 new spaces including 2 tandem spaces and 2 handicapped accessible spaces. The proposed parking plan would provide 49 on-site parking spaces, as compared to the 35 spaces currently available at the School. Other internal circulation improvements proposed as part of the project include the demolition of ten feet of existing building facing the driveway entrance onto Melrose Avenue to widen the driveway to accommodate two lanes; and modifications to on-site circulation to improve access to parking areas.
Lot coverage changes between the existing and the proposed project is summarized in Table 2 below:
PROJECT SITE |
Existing Sq.Ft. |
% of Total Site Area |
Proposed Sq. Ft. |
% of Total Site Area |
Building & Paved Coverage |
66,566 |
67.32% |
63,562 |
64.28% |
Semi-Pervious Surface |
8,264 |
8.36% |
12,063 |
12.20% |
Uncovered |
24,051 |
24.32% |
23,256* |
23.52% |
Total Land Area (2.27 Acres) |
98,881 |
100.00% |
98,881 |
100.00% |
TABLE 2: LOT COVERAGE
* Includes proposed bio-swale (348 Sq. Ft.)
A total of five trees are proposed for removal: two redwood trees, one Monterey pine tree, one Strawberry tree, and one fir tree. The project sponsor proposes a landscaping plan that includes replacement planting of 26 trees consisting of 8 California Buckeyes; 10 Coast Live Oaks; and 8 Coast Redwoods with an additional 380 shrubs, and other groundcover plantings consisting of native plant species.
The project sponsor estimates that the proposed project would require total grading involving approximately 615 cubic yards of excavation to be off-hauled, and 553 cubic yards of fill to be imported. Excavation would involve approximately 491 cubic yards for the new building and 124 cubic yards for the bioswale and permeable paving. Fill would involve 240 cubic yards of drain
rock and sand for the building, and 313 cubic yards of compacted soil material for the terrace. Approximately 322 cubic yards would be excavated and recompacted on site for the building pad.
The subject property is located at 305 Montford Avenue in Mill Valley, and is further identified as
Assessor’s Parcel 047-161-07.
22.42.060 of the Marin County Code).
The visual resources policies of the CWP and the Community Plan encourage new structures to be compatible in scale and design with the surrounding environment. Structures should follow the natural land contours and should not obstruct significant views from public viewing locations. The visual impact analysis concluded that the proposed project is consistent with these policies. The viewshed reconnaissance from adjacent streets, hills, and other possible vantages where the school site could be visible from public viewpoints and open space indicated that the school would be largely screened by existing vegetation or would be obstructed by existing buildings. No locations were identified where the project would obstruct any significant views. Staff observations from the surrounding area, including private properties, confirm the information provided by the visual analysis.
Although the project is generally consistent with this Finding, several features of the design in the area behind the new school building and adjacent to Montford Avenue should be modified to enhance the appearance of the school from the vantage point of Montrford Avenue. The interface between the institutional character of the school property and the residential character of the surrounding area is sensitive and requires an appropriate architectural and site design. The development on the school property intergrades effectively with residential area along Melrose Avenue, the natural area of Reed Creek, and the public area of the community center. However, the treatment of the area along Montford Avenue is inappropriate and should be modified to be compatible with the character of the community.
The design includes features that would normally be considered appropriate for an ally or service entrance, including a storage shed and utility entrance, two exterior staircases, and an emergency exit. Exterior materials that include concrete cinderblock and a wire fence are included in the proposal for this area. Staff recommends requiring a redesign of this area that would not adversely affect the architectural integrity of the design of the new school building, but would enhance this area adjacent to Montford Avenue. The following recommendations should govern the modifications to the design:
These modifications would ensure that sound and creative design principles have been used in designing the proposed project, which result in high quality site planning and architectural design, and the innovative use of materials, construction methods, and techniques.
The new building would be screened from view by the existing topography on the site and the existing vegetation and landscaping. From Montford Avenue the proposed building pad would be approximately twenty feet below the level of the street, since the property slopes from an elevation of approximately 134 feet at Montford Avenue to 114 feet at the base of the proposed structure. Consequently, approximately one and-a-half stories of the three-story structure would be visible from Montford Avenue. Photosimulations 2s, 3s and 4s show that the existing Acacia trees and other landscaping would largely hide the portion of the project above Montford Avenue. The proposed building is designed so that the third story is approximately half the square footage of the second story. The height and bulk of the proposed building would not create a significant visual impact viewed from Montford Avenue. The prominence of construction is be minimized by placing buildings so that they will be screened by existing vegetation, and depressions in the site topography. The exterior appearance of proposed structures, along with their associated landscaping, parking, signs, is compatible and harmonious with the design, scale, and context of surrounding properties.
As modified by the conditions of project approval, and discussed in the Initial Study, the project analysis and the other mandatory Findings, the project avoids conflicts between land uses, ensures that environmental values of the site are preserved, and adverse physical or visual effects which might otherwise result from unplanned or inappropriate development, design, or placement are minimized. The design of the project respects and preserves the natural beauty of the County and the environmental resources found in the area.
Site Planning, building design, and construction practices promote resource conservation through climate responsive design and use of renewable energy and resources as discussed in Finding G below. Further, the bioswale, the increase in pervious paving surface, and the drainage box/filter are environmentally beneficial and would ensure that fisheries values in the creek would not be reduced as a result of unfiltered runoff, sedimentation, erosion, and contamination from use of the roadway and parking areas. These features would protect water quality and fishery values associated with Reed Creek.
The proposed project would preserve the primary oak woodland habitat environment on the property that is concentrated in the riparian corridor adjacent to Reed Creek because most of the proposed construction would occur on an already developed site outside of the SCA. The project would result in the removal of five trees comprising two redwood trees, one Monterey pine tree, one strawberry tree, and one fir tree. The preliminary landscaping plan proposes planting of 26 trees resulting in an average of 5.2 replacement trees for each tree that would be removed by the project. The preliminary landscape plan calls for the planting of 380 shrubs. The proposed project would result in a net increase in the biomass due to the planting of trees, shrubs and groundcover.
The project would maintain significant trees and other landscaping and vegetation, which would reduce and soften the visual impacts of the new construction, stabilize and prevent the erosion of graded soils around the structure and enhance the privacy of the occupants of the subject and surrounding properties. Further, the landscaping plan would increase vegetation on the site. Landscaping would enhance the appearance of the new development and surrounding areas by being designed, installed, and maintained to blend new structures into the context of an established community.
The exterior appearance of the new school building, along with the associated landscaping, and parking, as well as the existing school sign, is compatible and harmonious with the design, scale, and context of surrounding properties. The existing sign on the front of the school compliments the school property because it is relatively small and well designed.
The proposed project is consistent with this Finding for the reasons expressed in Design Review Findings A and B herein.
The stability of the creek banks in the vicinity of the school site was investigated by a geotechnical consultant, Earth Mechanics Consulting Engineers. The report concluded that the creek banks on the site are generally stable. The Initial Study discusses this issue in detail, and as a condition of project approval the applicaant shall be required to submit a storm water pollution control plan prior to construction. All construction shall ensure drainage into the natural watershed in a manner that will avoid significant erosion or damage to adjacent properties, and impervious surfaces shall be minimized in the parking area within the SCA for Reed Creek.
Subsequent to the publication of the Initial Study, a tree fell in the channel of Reed Creek adjacent to the school property. Areas of localized erosion and the adjacent area where a tree fell were caused by surface water on the AC paving above the creek being directed toward and concentrated onto the creek bank. The engineer recommended that the collected surface water concentrated onto the creek bank slope would be improved by constructing a curb along the south side of the pavement in the area of the observed
erosion. The engineer’s recommendations address an existing condition on the MHS site unrelated to the proposed project and therefore does not require any revisions to the Initial Study. The engineer’s recommendations, however, are a part of the merit considerations of the project because the issue represents a land use compatibility problem or other policy concern for the project. A condition of project approval requires the construction of a curb along the south side of the pavement in the area of the observed erosion.
The proposed project will require total grading of approximately 615 cubic yards of excavation to be off-hauled, and 553 cubic yards of fill to be imported. Excavation would involve approximately 491 cubic yards for the new building and 124 cubic yards for the bioswale and permeable paving. Fill would involve 240 cubic yards of drain rock and sand for the building, and 313 cubic yards of compacted soil material for the terrace. Approximately 322 cubic yards would be excavated and recompacted on site for the building pad.
Grading would occur in compliance with Title 23, Chapter 23.08 of the County Code (Excavating, Grading and Filling), but shall be held to a minimum. Every reasonable effort would be made to retain the natural features of the land, including native vegetation, mature trees, and Reed Creek. Where grading is required, it would not create flat planes and sharp angles of intersection with natural terrain. Slopes would be rounded and contoured to blend with existing topography.
The project is consistent with this Finding as discussed in Use Permit Finding Vl.E below.
The project is consistent with this Finding for the reasons expressed in Finding V.A above.
The new school building would have a generally east-west orientation and would have a large expanse of windows on the southern façade of the building, which would maximize passive solar heating. Therefore, the proposed site planning and building design promote resource conservation through climate responsive design and use of renewable energy and resources.
Based on the photosimulations and a visual analysis of the project, the Initial Study concluded that the project would have a less than significant visual impact pursuant to CEQA. However, the Initial Study also noted that the issue of community character involves important community planning and land use considerations and the County may further consider community character policy issues in the context of evaluating the merits of the project and/or the conditions of approval.
Staff has carefully reviewed the plans, visited the neighborhood, and evaluated the project with respect to architectural and building design. The architectural style of the school is a departure from the prevailing residential styles found elsewhere in Homestead Valley. However, the design is consistent with the institutional character of a school and would add visual interest to the Homestead Valley community. Substantial existing vegetation, proposed landscaping and the topographical depression where the new school building would be located would enhance the integration of the new school building with the surrounding area.
As modified by the conditions of approval, the proposed project would be compatible with the physical character of the Homestead Valley area and consistent with the policies contained in the community plan. Other operational characteristics are discussed in the Use Permit Findings below.
The proposed project is consistent with the Countywide Plan and the Tamalpais Area Community Plan for the reasons expressed in Finding III above.
An Initial Study has been prepared pursuant to the requirements of the California Environmental Quality Act, and the Environmental Coordinator of the County of Marin has recommended the grant of a Negative Declaration of Environmental Impact. All potentially significant adverse effects of the project and the appropriate mitigation measures are discussed in the Initial Study. The mitigation measures are included as conditions of project approval in the recommended Resolution attached to this Staff Report.
The proposed project is consistent with this Finding for the reasons expressed in Design Review Finding V.A above.
The proposed project is consistent with this Finding for the reasons expressed in Design Review Findings V.A and V.B above.
The project is generally consistent with this Finding for the reasons expressed in the other Findings above. However, with respect to noise created by special events at the school as well as traffic, loading, parking congestion, conditions of approval are necessary to ensure that the alterations to the operations of the school would have adverse affects to the character of the local community.
The acoustical analysis prepared in connection with the Initial Study indicates that the average additional noise created by the increase in enrollment would be barely perceptible to the surrounding area, and would not result in significant adverse affects to the environment with respect to noise. However, it is important to note that determinations regarding the project’s consistency with community plan policies and compatibility with the character of the local community cannot be solely derived from whether an effect would exceed established thresholds of significance under CEQA. Subjective factors, including land use conflicts, are also important considerations that must be evaluated in accordance with community plan policy LU 19.2. Several comments received from community members note that Stolte Grove, the small park located west of the subject property, does not allow amplification during special events. The school’s operations should also be held to a reasonable standard that is consistent with the community character. Therefore, in order to maintain the quiet residential character of Homestead Valley, a condition of project approval prohibits the use of amplification during special events in the evening or on Sundays.
The school has developed a traffic management plan that would address adverse affects that the school’s current and future operations have on the Homestead Valley area. The traffic management plan contains mandatory measures for each family whose children attend Marin Horizon School. A contractual agreement signed by each family commits them to abide by the regulations of the traffic management plan. Violation of regulations can result in fines, loss of driving privileges to/from the school and expulsion from the school. The traffic management plan comprises five components: drop-off and pick-up of students; parking; carpooling; traffic management rules; and parent compliance. The principal features of these components are summarized in the analysis of the staff report.
The conditions of approval include requirements that the traffic management plan continue to operate effectively, with the assurance that independent monitoring of the traffic management measures would be enforced by the County. Proper implementation of the modified traffic management plan would ensure that the proposed project is compatible with adjacent land uses and intensity of development in the immediate area, and is consistent with the community plan because it would minimize adverse affects to the Homestead Valley area with respect to traffic, loading, and parking congestion
CONDITIONS OF APPROVAL:
Community Development Agency – Planning Division
classroom building and construct a new 11,478 square foot classroom building for a total building area of 24,451 square feet for the Marin Horizon School on the 2.27-acre Homestead School site. The new classroom building will be a primarily two-story building with a three-story component. The maximum height of the building, not including the mechanical enclosure will be 36.2 feet above grade. The maximum height of the mechanical enclosure will be 39.5 feet above grade. The following describes the various building heights and the respective area of each portion of the building and the mechanical equipment enclosure:
The building will have the following minimum property line setbacks: 19.5 feet front (north); 15 feet side (west); 170 feet side (east); and 170 feet rear (south). The project also includes a proposal to increase the permitted number of students enrolled in the school by 50 students, from a maximum of 250 students to a maximum of 300 students; increase staff levels from 44 Full Time Staff Equivalent (FTE), comprised of 31 full time and 16 part time employees, to 49 FTE comprised of 44 full time and 10 part time staff; construct a new stepped terrace along the western side property line; construct 14 new parking spaces on the southern portion of the playground for a total of 49 parking spaces; construct a new transformer 11 feet from the front property line facing Montford Avenue; demolish 10 feet of building located adjacent to the driveway access on the south side of the property; construct an additional pedestrian emergency walkway from the third floor to Montford Avenue; remove two redwood trees, one Monterey pine tree, one strawberry tree, and one fir tree; and install new landscaping.
The project also includes an Encroachment Permit to allow existing diagonal striping for the passenger loading area along Melrose Avenue to extend 2 feet into the street right-of-way. The additional encroachment into the right of way is to provide for a wider pedestrian way between the school building and the passenger drop-off and pick-up area for safety reasons. No change to the length of the passenger loading area is proposed.
Land Use Changes
The proposed land use changes include modifications to the school’s 1993 Use Permit to: (1) increase the enrollment from 250 to 300 students, and to (2) increase the staff from 44 FTE to 49 FTE. No change to the number of special non-instructional events in the evening is proposed.
Table 1 outlines the proposed changes. (The proposed changes to the 1993 Use Permit are bolded.) In order to clarify and provide additional specificity to the proposed project the sponsor has submitted a detailed month-by-month matrix of the number and type of non-instructional events and the corresponding maximum on-site population levels.
TABLE 1: PROPOSED SCHOOL USE
ACTIVITY |
Existing Use Permit |
Proposed Use Permit |
School Year |
|
|
Maximum Students (Pre-K to 12) |
250 |
300 |
Maximum Staff |
44 FTE |
49 FTE |
Permitted hours of operation for school, and enrichment classes |
7:30 A.M. to 6:00 P.M. |
No change |
Day Care |
7:30 A.M. to 8:30 A.M. 3:15 P.M. to 6:00 P.M. |
No change |
Non-Instructional Activities |
|
|
Special during school day events |
7 events |
14 events per year |
Special weekday evening events |
36 events per year |
No change |
SUMMER SCHOOL (June 15 to August 15) |
|
|
Permitted hours of operation |
9:00 A. M. to 3:00 P.M. |
No change |
Physical Improvements
The proposed physical improvements for the Marin Horizon School include modifications to existing buildings and facilities, demolition and removal of existing buildings, and construction of new buildings. The proposed improvements include:
The new building will hold 11 classrooms: 8 classrooms for the 4th to 8th grades and 3 specialized classrooms for music, science and a foreign language studio. Demolishing the existing middle school building will eliminate 6 of the existing K-8 classrooms. Thus with the new building, the school is gaining 5 additional classrooms.
The proposed on-site parking areas will be redeveloped and expanded by 14 new spaces including 2 tandem spaces and 2 handicapped accessible spaces. The proposed parking plan will provide 49 on- site parking spaces, as compared to the 35 spaces currently available at the School. Other internal circulation improvements proposed as part of the project include the demolition of ten feet of existing building facing the driveway entrance onto Melrose Avenue to widen the driveway to accommodate two lanes; and modifications to on-site circulation to improve access to parking areas.
Lot coverage changes between the existing and the proposed project is summarized in Table 2 below:
PROJECT SITE |
Existing Sq.Ft. |
% of Total Site Area |
Proposed Sq. Ft. |
% of Total Site Area |
Building & Paved Coverage |
66,566 |
67.32% |
63,562 |
64.28% |
Semi-Pervious Surface |
8,264 |
8.36% |
12,063 |
12.20% |
Uncovered |
24,051 |
24.32% |
23,256* |
23.52% |
Total Land Area (2.27 Acres) |
98,881 |
100.00% |
98,881 |
100.00% |
TABLE 2: LOT COVERAGE
* Includes proposed bio-swale (348 Sq. Ft.)
A total of five trees are proposed for removal: two redwood trees, one Monterey pine tree, one Strawberry tree, and one fir tree. The project sponsor proposes a landscaping plan that includes replacement planting of 26 trees consisting of 8 California Buckeyes; 10 Coast Live Oaks; and 8 Coast Redwoods with an additional 380 shrubs, and other groundcover plantings consisting of native plant species.
The project sponsor estimates that the proposed project will require total grading involving approximately 615 cubic yards of excavation to be off-hauled, and 553 cubic yards of fill to be imported. Excavation will involve approximately 491 cubic yards for the new building and 124 cubic yards for the bioswale and permeable paving. Fill will involve 240 cubic yards of drain rock and sand for the building, and 313 cubic yards of compacted soil material for the terrace. Approximately 322 cubic yards will be excavated and recompacted on site for the building pad.
The subject property is located at 305 Montford Avenue in Mill Valley, and is further identified as
Assessor’s Parcel 047-161-07.
construction activities, general tree care practices, and long-term vegetation management to ensure continued viability of the site’s native vegetation.
may install a story stud that clearly indicates the maximum building height through height increments that are marked on the stud and preapproved by the Building and Safety Inspection staff before installation or request that the Building and Safety Inspection staff measure the plate heights for conformance with the approved plans.
Marin County Department of Public Works – Land Use and Water Resources Division
The County of Marin does not allow compact parking spaces, but will allow exceptions for tandem spaces when under suitable control of owner.
Marin Municipal Water District
VESTING:
The applicant must vest this approval by: (1) obtaining a Building Permit or other construction permit, if required, for the approved work and substantially completing the improvements in accordance with the approved permits; and/or (2) commencing the allowed use on the property, in compliance with the conditions of approval or all rights granted in this approval shall lapse unless the applicant applies for an extension at least 10 days before the expiration date above and the Community Development Agency staff approves it. An extension of up to four years may be granted for cause pursuant to Section(s) 22.56.050.B.3 of the Marin County Code.
The Building Permit approval expires if the building or work authorized is not commenced within one year from the issuance of such permit. A Building Permit is valid for two years during which construction is required to be completed. All permits shall expire by limitation and become null and void if the building or work authorized by such permit is not completed within two years from the date of such permit. Please be advised that if your Building Permit lapses after the vesting date stipulated in this approval (and no extensions have been granted), the Building Permit, Design Review and Use Permit approvals may become null and void. Should the applicant have difficulty meeting the deadline for
completing the work pursuant to a Building Permit, the applicant may apply for an extension to the Design Review and Use Permit at least 10 days before the expiration of the approval.
NOW, THEREFORE BE IT FURTHER RESOLVED that upon completion of the requirements to vest this application, this Use Permit shall remain valid for 10 years or as long as all the terms of the permit are maintained. In the event that the conditions of this permit are not maintained, this Use Permit may be revoked or modified at a public hearing.
RIGHT TO APPEAL:
This decision is final unless appealed to the Board of Supervisors. A Petition for Appeal and a $700.00 filing fee must be submitted in the Community Development Agency – Planning Division, Room 308, Civic Center, San Rafael, no later than June 2, 2005.SECTION III: VOTE
PASSED AND ADOPTED at a regular meeting of the Planning Commission of the County of Marin, State of California, on the 23rd day of May, 2005, by the following vote to wit:
AYES:
NOES:
ABSENT:
STEVE C. THOMPSON, CHAIR
MARIN COUNTY PLANNING COMMISSION
Attest:
JESSICA WOODS, RECORDING SECRETARY
SECTION I: FINDINGS
The building would have the following minimum property line setbacks: 19.5 feet front (north); 15 feet side (west); 170 feet side (east); and 170 feet rear (south). The project also includes a proposal to increase the permitted number of students enrolled in the school by 50 students, from a maximum of 250 students to a maximum of 300 students; increase staff levels from 44 Full Time Staff Equivalent (FTE), comprised of 31 full time and 16 part time employees, to 49 FTE comprised of 44 full time and 10 part time staff; construct a new stepped terrace along the western side property line; construct 14 new parking spaces on the southern portion of the playground for a total of 49 parking spaces; construct a new transformer 11 feet from the front property line facing Montford Avenue; demolish 10 feet of building located adjacent to the driveway access on the south side of the property; construct an additional pedestrian emergency walkway from the third floor to Montford Avenue; remove two redwood trees, one Monterey pine tree, one strawberry tree, and one fir tree; and install new landscaping.
The project also includes an Encroachment Permit to allow existing diagonal striping for the passenger loading area along Melrose Avenue to extend 2 feet into the street right-of-way. The additional encroachment into the right of way is to provide for a wider pedestrian way between the school building and the passenger drop-off and pick-up area for safety reasons. No change to the length of the passenger loading area is proposed.
Land Use Changes
The proposed land use changes include modifications to the school’s 1993 Use Permit to: (1) increase the enrollment from 250 to 300 students, and to (2) increase the staff from 44 FTE to 49 FTE. No change to the number of special non-instructional events in the evening is proposed.
Table 1 outlines the proposed changes. (The proposed changes to the 1993 Use Permit are bolded.) In order to clarify and provide additional specificity to the proposed project the sponsor has submitted a detailed month-by-month matrix of the number and type of non-instructional events and the corresponding maximum on-site population levels.
TABLE 1: PROPOSED SCHOOL USE
ACTIVITY |
Existing Use Permit |
Proposed Use Permit |
School Year |
|
|
Maximum Students (Pre-K to 12) |
250 |
300 |
Maximum Staff |
44 FTE |
49 FTE |
Permitted hours of operation for school, and enrichment classes |
7:30 A.M. to 6:00 P.M. |
No change |
Day Care |
7:30 A.M. to 8:30 A.M. 3:15 P.M. to 6:00 P.M. |
No change |
Non-Instructional Activities |
|
|
Special during school day events |
7 events |
14 events per year |
Special weekday evening events |
36 events per year |
No change |
SUMMER SCHOOL (June 15 to August 15) |
|
|
Permitted hours of operation |
9:00 A. M. to 3:00 P.M. |
No change |
Physical Improvements
The proposed physical improvements for the Marin Horizon School include modifications to existing buildings and facilities, demolition and removal of existing buildings, and construction of new buildings. The proposed improvements include:
The new building would hold 11 classrooms: 8 classrooms for the 4th to 8th grades and 3 specialized classrooms for music, science and a foreign language studio. Demolishing the existing middle school building would eliminate 6 of the existing K-8 classrooms. Thus with the new building, the school is gaining 5 additional classrooms.
The proposed on-site parking areas would be redeveloped and expanded by 14 new spaces including 2 tandem spaces and 2 handicapped accessible spaces. The proposed parking plan would provide 49 on-site parking spaces, as compared to the 35 spaces currently available at the School. Other internal circulation improvements proposed as part of the project include the demolition of ten feet of existing building facing the driveway entrance onto Melrose Avenue to widen the driveway to accommodate two lanes; and modifications to on-site circulation to improve access to parking areas.
Lot coverage changes between the existing and the proposed project is summarized in Table 2 below:
PROJECT SITE |
Existing Sq.Ft. |
% of Total Site Area |
Proposed Sq. Ft. |
% of Total Site Area |
Building & Paved Coverage |
66,566 |
67.32% |
63,562 |
64.28% |
Semi-Pervious Surface |
8,264 |
8.36% |
12,063 |
12.20% |
Uncovered |
24,051 |
24.32% |
23,256* |
23.52% |
Total Land Area (2.27 Acres) |
98,881 |
100.00% |
98,881 |
100.00% |
TABLE 2: LOT COVERAGE
* Includes proposed bio-swale (348 Sq. Ft.)
A total of five trees are proposed for removal: two redwood trees, one Monterey pine tree, one Strawberry tree, and one fir tree. The project sponsor proposes a landscaping plan that includes replacement planting of 26 trees consisting of 8 California Buckeyes; 10 Coast Live Oaks; and 8 Coast Redwoods with an additional 380 shrubs, and other groundcover plantings consisting of native plant species.
The project sponsor estimates that the proposed project would require total grading involving approximately 615 cubic yards of excavation to be off-hauled, and 553 cubic yards of fill to be imported. Excavation would involve approximately 491 cubic yards for the new building and 124 cubic yards for the bioswale and permeable paving. Fill would involve 240 cubic yards of drain
rock and sand for the building, and 313 cubic yards of compacted soil material for the terrace. Approximately 322 cubic yards would be excavated and recompacted on site for the building pad.
The subject property is located at 305 Montford Avenue in Mill Valley, and is further identified as
Assessor’s Parcel 047-161-07.
22.42.060 of the Marin County Code).
The visual resources policies of the CWP and the Community Plan encourage new structures to be compatible in scale and design with the surrounding environment. Structures should follow the natural land contours and should not obstruct significant views from public viewing locations. The visual impact analysis concluded that the proposed project is consistent with these policies. The viewshed reconnaissance from adjacent streets, hills, and other possible vantages where the school site could be visible from public viewpoints and open space indicated that the school would be largely screened by existing vegetation or would be obstructed by existing buildings. No locations were identified where the project would obstruct any significant views. Staff observations from the surrounding area, including private properties, confirm the information provided by the visual analysis.
Although the project is generally consistent with this Finding, several features of the design in the area behind the new school building and adjacent to Montford Avenue should be modified to enhance the appearance of the school from the vantage point of Montrford Avenue. The interface between the institutional character of the school property and the residential character of the surrounding area is sensitive and requires an appropriate architectural and site design. The development on the school property intergrades effectively with residential area along Melrose Avenue, the natural area of Reed Creek, and the public area of the community center. However, the treatment of the area along Montford Avenue is inappropriate and should be modified to be compatible with the character of the community.
The design includes features that would normally be considered appropriate for an ally or service entrance, including a storage shed and utility entrance, two exterior staircases, and an emergency exit. Exterior materials that include concrete cinderblock and a wire fence are included in the proposal for this area. Staff recommends requiring a redesign of this area that would not adversely affect the architectural integrity of the design of the new school building, but would enhance this area adjacent to Montford Avenue. The following recommendations should govern the modifications to the design:
These modifications would ensure that sound and creative design principles have been used in designing the proposed project, which result in high quality site planning and architectural design, and the innovative use of materials, construction methods, and techniques.
The new building would be screened from view by the existing topography on the site and the existing vegetation and landscaping. From Montford Avenue the proposed building pad would be approximately twenty feet below the level of the street, since the property slopes from an elevation of approximately 134 feet at Montford Avenue to 114 feet at the base of the proposed structure. Consequently, approximately one and-a-half stories of the three-story structure would be visible from Montford Avenue. Photosimulations 2s, 3s and 4s show that the existing Acacia trees and other landscaping would largely hide the portion of the project above Montford Avenue. The proposed building is designed so that the third story is approximately half the square footage of the second story. The height and bulk of the proposed building would not create a significant visual impact viewed from Montford Avenue. The prominence of construction is be minimized by placing buildings so that they will be screened by existing vegetation, and depressions in the site topography. The exterior appearance of proposed structures, along with their associated landscaping, parking, signs, is compatible and harmonious with the design, scale, and context of surrounding properties.
As modified by the conditions of project approval, and discussed in the Initial Study, the project analysis and the other mandatory Findings, the project avoids conflicts between land uses, ensures that environmental values of the site are preserved, and adverse physical or visual effects which might otherwise result from unplanned or inappropriate development, design, or placement are minimized. The design of the project respects and preserves the natural beauty of the County and the environmental resources found in the area.
Site Planning, building design, and construction practices promote resource conservation through climate responsive design and use of renewable energy and resources as discussed in Finding G below. Further, the bioswale, the increase in pervious paving surface, and the drainage box/filter are environmentally beneficial and would ensure that fisheries values in the creek would not be reduced as a result of unfiltered runoff, sedimentation, erosion, and contamination from use of the roadway and parking areas. These features would protect water quality and fishery values associated with Reed Creek.
The proposed project would preserve the primary oak woodland habitat environment on the property that is concentrated in the riparian corridor adjacent to Reed Creek because most of the proposed construction would occur on an already developed site outside of the SCA. The project would result in the removal of five trees comprising two redwood trees, one Monterey pine tree, one strawberry tree, and one fir tree. The preliminary landscaping plan proposes planting of 26 trees resulting in an average of 5.2 replacement trees for each tree that would be removed by the project. The preliminary landscape plan calls for the planting of 380 shrubs. The proposed project would result in a net increase in the biomass due to the planting of trees, shrubs and groundcover.
The project would maintain significant trees and other landscaping and vegetation, which would reduce and soften the visual impacts of the new construction, stabilize and prevent the erosion of graded soils around the structure and enhance the privacy of the occupants of the subject and surrounding properties. Further, the landscaping plan would increase vegetation on the site. Landscaping would enhance the appearance of the new development and surrounding areas by being designed, installed, and maintained to blend new structures into the context of an established community.
The exterior appearance of the new school building, along with the associated landscaping, and parking, as well as the existing school sign, is compatible and harmonious with the design, scale, and context of surrounding properties. The existing sign on the front of the school compliments the school property because it is relatively small and well designed.
The proposed project is consistent with this Finding for the reasons expressed in Design Review Findings A and B herein.
The stability of the creek banks in the vicinity of the school site was investigated by a geotechnical consultant, Earth Mechanics Consulting Engineers. The report concluded that the creek banks on the site are generally stable. The Initial Study discusses this issue in detail, and as a condition of project approval the applicaant shall be required to submit a storm water pollution control plan prior to construction. All construction shall ensure drainage into the natural watershed in a manner that will avoid significant erosion or damage to adjacent properties, and impervious surfaces shall be minimized in the parking area within the SCA for Reed Creek.
Subsequent to the publication of the Initial Study, a tree fell in the channel of Reed Creek adjacent to the school property. Areas of localized erosion and the adjacent area where a tree fell were caused by surface water on the AC paving above the creek being directed toward and concentrated onto the creek bank. The engineer recommended that the collected surface water concentrated onto the creek bank slope would be improved by constructing a curb along the south side of the pavement in the area of the observed
erosion. The engineer’s recommendations address an existing condition on the MHS site unrelated to the proposed project and therefore does not require any revisions to the Initial Study. The engineer’s recommendations, however, are a part of the merit considerations of the project because the issue represents a land use compatibility problem or other policy concern for the project. A condition of project approval requires the construction of a curb along the south side of the pavement in the area of the observed erosion.
The proposed project will require total grading of approximately 615 cubic yards of excavation to be off-hauled, and 553 cubic yards of fill to be imported. Excavation would involve approximately 491 cubic yards for the new building and 124 cubic yards for the bioswale and permeable paving. Fill would involve 240 cubic yards of drain rock and sand for the building, and 313 cubic yards of compacted soil material for the terrace. Approximately 322 cubic yards would be excavated and recompacted on site for the building pad.
Grading would occur in compliance with Title 23, Chapter 23.08 of the County Code (Excavating, Grading and Filling), but shall be held to a minimum. Every reasonable effort would be made to retain the natural features of the land, including native vegetation, mature trees, and Reed Creek. Where grading is required, it would not create flat planes and sharp angles of intersection with natural terrain. Slopes would be rounded and contoured to blend with existing topography.
The project is consistent with this Finding as discussed in Use Permit Finding Vl.E below.
The project is consistent with this Finding for the reasons expressed in Finding V.A above.
The new school building would have a generally east-west orientation and would have a large expanse of windows on the southern façade of the building, which would maximize passive solar heating. Therefore, the proposed site planning and building design promote resource conservation through climate responsive design and use of renewable energy and resources.
Based on the photosimulations and a visual analysis of the project, the Initial Study concluded that the project would have a less than significant visual impact pursuant to CEQA. However, the Initial Study also noted that the issue of community character involves important community planning and land use considerations and the County may further consider community character policy issues in the context of evaluating the merits of the project and/or the conditions of approval.
Staff has carefully reviewed the plans, visited the neighborhood, and evaluated the project with respect to architectural and building design. The architectural style of the school is a departure from the prevailing residential styles found elsewhere in Homestead Valley. However, the design is consistent with the institutional character of a school and would add visual interest to the Homestead Valley community. Substantial existing vegetation, proposed landscaping and the topographical depression where the new school building would be located would enhance the integration of the new school building with the surrounding area.
As modified by the conditions of approval, the proposed project would be compatible with the physical character of the Homestead Valley area and consistent with the policies contained in the community plan. Other operational characteristics are discussed in the Use Permit Findings below.
The proposed project is consistent with the Countywide Plan and the Tamalpais Area Community Plan for the reasons expressed in Finding III above.
An Initial Study has been prepared pursuant to the requirements of the California Environmental Quality Act, and the Environmental Coordinator of the County of Marin has recommended the grant of a Negative Declaration of Environmental Impact. All potentially significant adverse effects of the project and the appropriate mitigation measures are discussed in the Initial Study. The mitigation measures are included as conditions of project approval in the recommended Resolution attached to this Staff Report.
The proposed project is consistent with this Finding for the reasons expressed in Design Review Finding V.A above.
The proposed project is consistent with this Finding for the reasons expressed in Design Review Findings V.A and V.B above.
The project is generally consistent with this Finding for the reasons expressed in the other Findings above. However, with respect to noise created by special events at the school as well as traffic, loading, parking congestion, conditions of approval are necessary to ensure that the alterations to the operations of the school would have adverse affects to the character of the local community.
The acoustical analysis prepared in connection with the Initial Study indicates that the average additional noise created by the increase in enrollment would be barely perceptible to the surrounding area, and would not result in significant adverse affects to the environment with respect to noise. However, it is important to note that determinations regarding the project’s consistency with community plan policies and compatibility with the character of the local community cannot be solely derived from whether an effect would exceed established thresholds of significance under CEQA. Subjective factors, including land use conflicts, are also important considerations that must be evaluated in accordance with community plan policy LU 19.2. Several comments received from community members note that Stolte Grove, the small park located west of the subject property, does not allow amplification during special events. The school’s operations should also be held to a reasonable standard that is consistent with the community character. Therefore, in order to maintain the quiet residential character of Homestead Valley, a condition of project approval prohibits the use of amplification during special events in the evening or on Sundays.
The school has developed a traffic management plan that would address adverse affects that the school’s current and future operations have on the Homestead Valley area. The traffic management plan contains mandatory measures for each family whose children attend Marin Horizon School. A contractual agreement signed by each family commits them to abide by the regulations of the traffic management plan. Violation of regulations can result in fines, loss of driving privileges to/from the school and expulsion from the school. The traffic management plan comprises five components: drop-off and pick-up of students; parking; carpooling; traffic management rules; and parent compliance. The principal features of these components are summarized in the analysis of the staff report.
The conditions of approval include requirements that the traffic management plan continue to operate effectively, with the assurance that independent monitoring of the traffic management measures would be enforced by the County. Proper implementation of the modified traffic management plan would ensure that the proposed project is compatible with adjacent land uses and intensity of development in the immediate area, and is consistent with the community plan because it would minimize adverse affects to the Homestead Valley area with respect to traffic, loading, and parking congestion
CONDITIONS OF APPROVAL:
Community Development Agency – Planning Division
classroom building and construct a new 11,478 square foot classroom building for a total building area of 24,451 square feet for the Marin Horizon School on the 2.27-acre Homestead School site. The new classroom building will be a primarily two-story building with a three-story component. The maximum height of the building, not including the mechanical enclosure will be 36.2 feet above grade. The maximum height of the mechanical enclosure will be 39.5 feet above grade. The following describes the various building heights and the respective area of each portion of the building and the mechanical equipment enclosure:
The building will have the following minimum property line setbacks: 19.5 feet front (north); 15 feet side (west); 170 feet side (east); and 170 feet rear (south). The project also includes a proposal to increase the permitted number of students enrolled in the school by 50 students, from a maximum of 250 students to a maximum of 300 students; increase staff levels from 44 Full Time Staff Equivalent (FTE), comprised of 31 full time and 16 part time employees, to 49 FTE comprised of 44 full time and 10 part time staff; construct a new stepped terrace along the western side property line; construct 14 new parking spaces on the southern portion of the playground for a total of 49 parking spaces; construct a new transformer 11 feet from the front property line facing Montford Avenue; demolish 10 feet of building located adjacent to the driveway access on the south side of the property; construct an additional pedestrian emergency walkway from the third floor to Montford Avenue; remove two redwood trees, one Monterey pine tree, one strawberry tree, and one fir tree; and install new landscaping.
The project also includes an Encroachment Permit to allow existing diagonal striping for the passenger loading area along Melrose Avenue to extend 2 feet into the street right-of-way. The additional encroachment into the right of way is to provide for a wider pedestrian way between the school building and the passenger drop-off and pick-up area for safety reasons. No change to the length of the passenger loading area is proposed.
Land Use Changes
The proposed land use changes include modifications to the school’s 1993 Use Permit to: (1) increase the enrollment from 250 to 300 students, and to (2) increase the staff from 44 FTE to 49 FTE. No change to the number of special non-instructional events in the evening is proposed.
Table 1 outlines the proposed changes. (The proposed changes to the 1993 Use Permit are bolded.) In order to clarify and provide additional specificity to the proposed project the sponsor has submitted a detailed month-by-month matrix of the number and type of non-instructional events and the corresponding maximum on-site population levels.
TABLE 1: PROPOSED SCHOOL USE
ACTIVITY |
Existing Use Permit |
Proposed Use Permit |
School Year |
|
|
Maximum Students (Pre-K to 12) |
250 |
300 |
Maximum Staff |
44 FTE |
49 FTE |
Permitted hours of operation for school, and enrichment classes |
7:30 A.M. to 6:00 P.M. |
No change |
Day Care |
7:30 A.M. to 8:30 A.M. 3:15 P.M. to 6:00 P.M. |
No change |
Non-Instructional Activities |
|
|
Special during school day events |
7 events |
14 events per year |
Special weekday evening events |
36 events per year |
No change |
SUMMER SCHOOL (June 15 to August 15) |
|
|
Permitted hours of operation |
9:00 A. M. to 3:00 P.M. |
No change |
Physical Improvements
The proposed physical improvements for the Marin Horizon School include modifications to existing buildings and facilities, demolition and removal of existing buildings, and construction of new buildings. The proposed improvements include:
The new building will hold 11 classrooms: 8 classrooms for the 4th to 8th grades and 3 specialized classrooms for music, science and a foreign language studio. Demolishing the existing middle school building will eliminate 6 of the existing K-8 classrooms. Thus with the new building, the school is gaining 5 additional classrooms.
The proposed on-site parking areas will be redeveloped and expanded by 14 new spaces including 2 tandem spaces and 2 handicapped accessible spaces. The proposed parking plan will provide 49 on- site parking spaces, as compared to the 35 spaces currently available at the School. Other internal circulation improvements proposed as part of the project include the demolition of ten feet of existing building facing the driveway entrance onto Melrose Avenue to widen the driveway to accommodate two lanes; and modifications to on-site circulation to improve access to parking areas.
Lot coverage changes between the existing and the proposed project is summarized in Table 2 below:
PROJECT SITE |
Existing Sq.Ft. |
% of Total Site Area |
Proposed Sq. Ft. |
% of Total Site Area |
Building & Paved Coverage |
66,566 |
67.32% |
63,562 |
64.28% |
Semi-Pervious Surface |
8,264 |
8.36% |
12,063 |
12.20% |
Uncovered |
24,051 |
24.32% |
23,256* |
23.52% |
Total Land Area (2.27 Acres) |
98,881 |
100.00% |
98,881 |
100.00% |
TABLE 2: LOT COVERAGE
* Includes proposed bio-swale (348 Sq. Ft.)
A total of five trees are proposed for removal: two redwood trees, one Monterey pine tree, one Strawberry tree, and one fir tree. The project sponsor proposes a landscaping plan that includes replacement planting of 26 trees consisting of 8 California Buckeyes; 10 Coast Live Oaks; and 8 Coast Redwoods with an additional 380 shrubs, and other groundcover plantings consisting of native plant species.
The project sponsor estimates that the proposed project will require total grading involving approximately 615 cubic yards of excavation to be off-hauled, and 553 cubic yards of fill to be imported. Excavation will involve approximately 491 cubic yards for the new building and 124 cubic yards for the bioswale and permeable paving. Fill will involve 240 cubic yards of drain rock and sand for the building, and 313 cubic yards of compacted soil material for the terrace. Approximately 322 cubic yards will be excavated and recompacted on site for the building pad.
The subject property is located at 305 Montford Avenue in Mill Valley, and is further identified as
Assessor’s Parcel 047-161-07.
construction activities, general tree care practices, and long-term vegetation management to ensure continued viability of the site’s native vegetation.
may install a story stud that clearly indicates the maximum building height through height increments that are marked on the stud and preapproved by the Building and Safety Inspection staff before installation or request that the Building and Safety Inspection staff measure the plate heights for conformance with the approved plans.
Marin County Department of Public Works – Land Use and Water Resources Division
The County of Marin does not allow compact parking spaces, but will allow exceptions for tandem spaces when under suitable control of owner.
Marin Municipal Water District
VESTING:
The applicant must vest this approval by: (1) obtaining a Building Permit or other construction permit, if required, for the approved work and substantially completing the improvements in accordance with the approved permits; and/or (2) commencing the allowed use on the property, in compliance with the conditions of approval or all rights granted in this approval shall lapse unless the applicant applies for an extension at least 10 days before the expiration date above and the Community Development Agency staff approves it. An extension of up to four years may be granted for cause pursuant to Section(s) 22.56.050.B.3 of the Marin County Code.
The Building Permit approval expires if the building or work authorized is not commenced within one year from the issuance of such permit. A Building Permit is valid for two years during which construction is required to be completed. All permits shall expire by limitation and become null and void if the building or work authorized by such permit is not completed within two years from the date of such permit. Please be advised that if your Building Permit lapses after the vesting date stipulated in this approval (and no extensions have been granted), the Building Permit, Design Review and Use Permit approvals may become null and void. Should the applicant have difficulty meeting the deadline for
completing the work pursuant to a Building Permit, the applicant may apply for an extension to the Design Review and Use Permit at least 10 days before the expiration of the approval.
NOW, THEREFORE BE IT FURTHER RESOLVED that upon completion of the requirements to vest this application, this Use Permit shall remain valid for 10 years or as long as all the terms of the permit are maintained. In the event that the conditions of this permit are not maintained, this Use Permit may be revoked or modified at a public hearing.
RIGHT TO APPEAL:
This decision is final unless appealed to the Board of Supervisors. A Petition for Appeal and a $700.00 filing fee must be submitted in the Community Development Agency – Planning Division, Room 308, Civic Center, San Rafael, no later than June 2, 2005.SECTION III: VOTE
PASSED AND ADOPTED at a regular meeting of the Planning Commission of the County of Marin, State of California, on the 23rd day of May, 2005, by the following vote to wit:
AYES:
NOES:
ABSENT:
STEVE C. THOMPSON, CHAIR
MARIN COUNTY PLANNING COMMISSION
Attest:
JESSICA WOODS, RECORDING SECRETARY
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