Exhibit 8 - Addendum No. 1 to Skyline Heights EIR.pdf — Corona City Council, July 1, 2026 (part 5 of 5)

Mitigation Measure No./Implementing Action Responsible for Monitoring Monitoring Frequency Timing of Verification Method of Verification Verified Date/Initials
Sanctions for NonCompliance
Mitigation Measure GEO-6: Fill Placement, Moisture Conditioning, And Compaction. After approval of the overexcavation and prior to placement of any compacted engineered fill materials, the exposed removal bottoms shall be scarified to a minimum depth of six (6) inches.

The area shall then be moisture conditioned approximately 1 to 2 percentage points above the optimum moisture content, and compacted to a minimum of 90 (or 93) percent of the applicable maximum density. The planned development will involve deep fills in the canyon areas and side-hill fill slopes. In order to reduce the amount of fill settlement, the fill shall be compacted to the minimum relative compaction shown below:

Fill Depth (Feet)
Minimum Relative Compaction
(ASTM: D1557) (%)
0 – 50 90
Below 50 93
Fill slopes shall also be constructed at the minimum relative compactions shown above, with the exception of the outer 3 feet of the slope face which can be placed at 90% relative compaction. Deep fill areas requiring 93% relative compaction are delineated in Plate VI of the Geotechnical Report.

Generation of oversized rock (over 8 inches in maximum dimension) from excavations in the bedrocks is anticipated.

Oversize rock shall be placed in single file windrows not exceeding three feet in height and six (6) feet in width with a minimum equipment width (15 feet) separating each windrow or a rock blanket fill not exceeding two (2) to three (3) feet in height. Large erratic rocks shall be buried individually. Granular fill shall be thoroughly flooded in the rock voids and covered with a minimum two feet compacted fill blanket. Successive windrows shall be staggered and none shall be placed within 10 feet of finished grade or closer than 15 feet to compacted fill slope surfaces. Typical rock placement construction detail is provided in Appendix IV of the Geotechnical Report. Placement of rock windrows shall be performed under the observation and recommendations of the Project Geotechnical Engineer.

Fill materials shall be spread in thin lifts, moisture conditioned to about 1 to 2 percentage points over optimum moisture content and compacted to a minimum of 90 (or 93) percent of the laboratory maximum dry density as determined in accordance with ASTM Test Method D-1557. Each lift shall be treated in a like manner until the desired finished grades are achieved.

The grading contractor shall have suitable and sufficient compaction equipment in operation to achieve the required compaction. When necessary, earthmoving equipment may be utilized for compaction or temporarily halted in order to permit adequate compaction of fills.

City of Corona
-Development Services Div.

Once during plan check;
As needed during site
grading and
construction
Plan check; As needed during
grading and construction
activities
Review of plans; On-site
inspection
Withhold grading or
building permit; Halt
grading and
construction activities
Mitigation Measure GEO-7: Slope Construction

1. Care shall be taken during grading to prevent spillage of loose materials over slopes to remain natural. Should loose soil be spilled onto natural slopes by the grading contractor, removal of the loose fill shall be required.

2. Fill shall be properly benched into firm bedrock or compacted fill as directed by the Project Engineering Geologist and/or Geotechnical Engineer during grading. Typical benching shall include 4-foot verticals exposing approved, competent material (see Appendix D – Typical Benching Detail of the Geotechnical Report).

3. In order to minimize surficial slumps on compacted fill slopes, the following grading procedures shall be used:
a) Where possible, fill slopes shall be constructed by overfilling a minimum of three (3) horizontal feet and then trimming back to expose the dense inner core of the slope surface. Compacted fill slopes shall be back-rolled during construction at intervals not exceeding four (4) vertical feet. Care shall be taken to construct the slope in a workmanlike manner so that it is positioned at its designed orientation and slope ratio. Achieving a uniform slope surface by subsequent thin wedge filling must be avoided. Any add-on correction to a fill slope shall be done by overfilling the affected area in horizontal, compacted lifts which must be benched into the existing fill prism. The overfilled slope may then be trimmed to the design gradient.
b) Where fill slopes are planned above natural slopes and cannot be overfilled and trimmed back, the slopes shall be rolled for the entire height of the slope with a sheepsfoot roller and then finished with a grid roller.

If the desired compaction is not obtained in this manner, a vibratory sheepsfoot roller may be required. To City of Corona
-Development Services Division
As needed during site
grading and
construction
As needed during site grading
and construction
On-site inspection Halt grading and
construction activities

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Mitigation Measure No./Implementing Action Responsible for Monitoring Monitoring Frequency Timing of Verification Method of Verification Verified Date/Initials
Sanctions for NonCompliance
be most effective, this equipment shall be anchored and manipulated from a side-boom tractor. In lieu of a grid roller, the slope may be track rolled with a John Deere 450, Caterpillar D-8 dozer or equivalent. To obtain the required compaction and appearance of the slope face, the soil moisture shall be maintained at above optimum from the time of mass filling to the completion of grid rolling. c) The grading contractor shall take proper care to avoid spillage of loose material down the face of the slopes during grading and during drainage terrace and down-drain construction. Fine grading operations for benches and down-drains shall not deposit loose trimmed soils on the finished slope surfaces. Loose soil materials shall require removal.
d) Seeding and planting of slopes shall proceed as rapidly as possible to achieve a well-established and deeprooted vegetal cover requiring minimal watering. The type of vegetation and watering schedule shall be established by a landscape architect familiar with hillside maintenance.

Mitigation Measure GEO-8: Earthwork Observations And Testing a) The site preparation, over-excavation, and earthwork shall be performed under the observation and testing by a representative of the Project Geotechnical Engineer or Project Geologist. b) The fill shall be tested at the time of placement to verify that the required compaction is achieved. c) The fill compaction shall be determined in the field by the Sand Cone Method (ASTM: D 1556) or Nuclear Gauge Method (ASTM: D 2216), or other test method approved by the Project Geotechnical Engineer. d) During grading, an adequate number of field density tests shall be performed using approved test procedures in order to determine compliance of earthwork to the project requirements. The frequency of field density testing shall be in accordance with the recommendations of the Project Geotechnical Engineer. e) Quality control testing performed to determine the acceptability of the fill compaction shall be based on the laboratory maximum dry density and optimum moisture content determined in accordance with ASTM: D 1557 test procedure.
f) Any surface or subsurface obstructions, or questionable materials encountered during grading shall be brought immediately to the attention of the Project Geotechnical Engineer. Deeper excavations may be required, should unsuitable soils be encountered locally, as determined by the Project Geotechnical Engineer and/or Project Geologist.

City of Corona
-Development Services Division
As needed during site
grading and
construction
As needed during grading and
construction activities
On-site inspection and review of
test results/ reports
Halt grading and/or
construction activities
Mitigation Measure GEO-9: Deep Fill Settlement Monitoring. In deep fill areas, settlement monuments shall be installed and periodically surveyed by the project civil engineer to evaluate the magnitude and progress of settlements. Ginter & associates proposes positioning settlement monuments at strategic locations in the deeper fill areas as shown on figure vi of the geotechnical report. These shall be monitored on a regular basis until the primary settlement has stabilized before those areas released for construction.

City of Corona
-Development Services Division
As needed during site
grading and
construction
As needed during grading and
construction activities
On-site inspection Halt grading and/or
construction activities
Mitigation Measure GEO-10: Foundation Design. The compacted engineered fill at the project site is anticipated to be low to medium soil expansion potential. Presented below are preliminary geotechnical criteria for design of building foundations, based on medium soil expansion potential for the on-site soils:

Option 1 - Conventional Footing:

Allowable Bearing Pressure (1) = 1,500 pounds per square foot (psf) Minimum Footing Depth (2) = 24 inches
Minimum Footing Width = Continuous: 12 inches; Isolated: 24 inches Passive Soil Pressure (3) = 250 psf/ft.

Friction Coefficient = 0.30 (ultimate)
Minimum Footing Reinforcement = Four No. 4 bars, 2 each at top and bottom Garage Door Grade Beam = 18 inches deep, Four No. 4 bars, Two each at top and bottom, tied into foundation elements.
(1) The above value may be increased 250 psf for each additional foot exceeding the minimum embedment depth and/or width, subject to a maximum of 2,500 psf. Allowable bearing pressures may be increased by one-third for short term loading due to wind or seismic forces.
(2) Footing depth is from lowest adjacent finished soil grade. Footings shall be deepened, as necessary, to provide setback distance from adjacent slope in conformance with CBC criteria.

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Option 2 – Post-Tensioned Foundation:

If post-tensioned slab/footing system is selected for the subject project, the design may be based on the geotechnical criteria shown below for medium soil expansion potential. These are based on the guidelines presented in the PTI, Third Edition design manual.

Thornthwaite Moisture Index = -20
Equilibrium Suction = 3.6
Edge Lift Moisture Variation Distance, em = 5.1 feet
Edge Lift, ym = 1.1 inches
Center Lift Moisture Variation Distance, em = 9.0 feet
Center Lift, ym = 0.47 inches
Minimum Footing Depth (Exterior) = 18 inches below adjacent grade The above foundation criteria are based on medium soil expansion consideration only. Foundation design shall consider anticipated post-construction settlements, as appropriate. Foundation design details such as slab thickness, concrete strength, reinforcements, etc. shall be established by the Project Structural Engineer considering medium soil expansion and settlement potential provided below.

Mitigation Measure GEO-11: Foundation Settlement. Total static and differential post-construction settlements for footings designed and constructed in accordance with the criteria given below and supporting loads not exceeding the typical loadings for residential construction (column and wall loads on the order of 30 kips and 3 kips/lineal foot, respectively) are not anticipated to exceed the values shown below. The settlement estimates shall be confirmed based on review of the foundation plans. Structures shall be designed for the following post-construction settlements:
- Total settlement = 1 inch
- Differential settlement = ¾-inch (*)
(*) Between similarly loaded column footings and for continuous footings and slabs over a distance of approximately 30 feet.

General Remarks:
(i) Footing depths shall not be allowed to be affected adversely, such as through erosion softening, digging, landscaping, etc.
(ii) Where foundations encroach closer than five (5) feet horizontally from the flow line of drainage swales, the footing shall be deepened sufficiently to maintain the required embedment depth below the adjacent flow line. (iii) Foundation details such as concrete strength, reinforcements, etc. shall be established by the Project Structural Engineer, considering the loading and medium soil expansion potential. The footing and slab reinforcements recommended in the Geotechnical Report are minimum requirements. More restrictive criteria based on structural design considerations or Code requirements shall govern. (iv) Foundation excavations shall be observed and approved by the Project Geotechnical Engineer prior to the placement of reinforcement or concrete. Forming of footing excavations may be required. Excavations shall be free of slough and debris and thoroughly moisture conditioned prior to placing concrete. (v) Excavated material from footing and utility trenches shall not be placed in slab-on-grade areas unless properly compacted and tested.

Recommended Minimum Criteria For Slab-On-Grade Are Shown Below:

Concrete Floor Slabs: Concrete floor slabs shall be 5 inches thick (minimum) and shall be reinforced with No. 3 bars at 18 inches on center, each way at mid height. No. 3 bars at 18 inches on center shall be provided connecting floor slabs to footings. In order to minimize migration of moisture up the concrete slab from soil subgrade and damage to floor coverings, a moisture barrier/water vapor retarder is recommended beneath floor slabs as discussed hereinafter.

Moisture/Water Vapor Retarder for Concrete Slab- on-Grade: In order to reduce the potential for moisture/water vapor migration up through the slab and possibly affecting floor covering, a moisture/vapor retarder is recommended under City of Corona
-Building Division
Once during plan check;
As needed during site
grading and
construction
Plan check; As needed during
grading and construction
activities
Review of plans; On-site
inspection
Withhold grading or
building permit; Halt
grading and
construction activities

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Mitigation Measure No./Implementing Action Responsible for Monitoring Monitoring Frequency Timing of Verification Method of Verification Verified Date/Initials
Sanctions for NonCompliance
concrete floor slab-on-grade. The moisture barrier shall be properly installed, lapped and sealed in accordance with the manufacturer’s specifications.

Punctures and rips shall be repaired prior to placement of sand. At a minimum, this moisture/water vapor retarder shall consist of 10- millimeter thick polyethylene (“Visqueen”), lapped and sealed, and placed mid-height within a 4-inch coarse sand layer. This moisture/water vapor retarder shall be installed in accordance with manufacturer’s specifications. The following recommendations are based on the tentative guidelines by the American Concrete Institute (ACI, April 2001) to reduce the potential moisture/water vapor intrusion in concrete slab-on-grade. Based on Ginter & Associates’ review of available literature, it appears that the ACI procedure would be more effective to help reduce potential moisture/water vapor migration up through concrete slab-on-grade.

Recommendations based on the ACI guidelines are presented below:
• The moisture/water vapor retarder shall consist of high strength polyethylene membrane and shall meet or exceed the ASTM: E-1745-97 Class C material requirements for water vapor permeance, tensile strength and puncture resistance. The vapor retarder shall consist of “Moistop Plus” (Fortifiber Building Products Systems) or “Vapor Block” VB 15 (Americover, Inc.), or approved equal. The vapor retarder shall be underlain by a capillary break comprised of minimum 4 inches thick pea gravel layer. The gravel layer shall be placed and compacted on approved soil sub-grade.
• The membrane shall be placed on approved gravel layer and properly lapped and sealed. Membranes intersecting utility pipes, sewer lines, ducts or drains shall be properly wrapped around the penetrations and sealed. All punctures and rips in the membrane shall be repaired prior to placement of concrete, following manufacturer’s recommendations. The vapor retarder shall be installed in general accordance with the procedures outlined in ASTM: E-1643, and in conformance with the installation procedures recommended by the manufacturer.
• To minimize slab curling, a low slump concrete (low shrinkage mix design) shall be used for the slab construction, as determined by the Project Structural Engineer.

The moisture/water vapor protection for concrete slab-on-grade shall be selected based on cost and construction considerations, and considering potential future problems resulting from improper and uncontrolled landscape irrigation practices.

Regardless of the moisture/water vapor retarder option selected, it should be emphasized that proper control of irrigation and landscape water adjacent to the structure is of paramount importance.

Mitigation Measure GEO-13: Driveways. Driveway concrete slabs shall be 5 inches thick (minimum) with no. 3 bars at 18 inches on center, each way at mid-height. The slab may be placed directly on properly prepared sub-grade. No moisture barrier is required under driveway slabs.

City of Corona
-Building Division
Once during plan check;
As needed during site
grading and
construction
Plan check; As needed during
grading and construction
activities
Review of plans; On-site
inspection
Withhold grading or
building permit; Halt
grading and
construction activities
Mitigation Measure GEO-14: Exterior Flatwork. Exterior concrete flatwork (e.g. Sidewalks, walkways) shall be 4 inches thick (minimum), with no. 3 bars at 24 inches on center, each way at mid-height and placed on properly prepared subgrade. Hardscape areas within two feet of the descending slopes shall include a thickened edge deepened to provide a minimum five (5) feet horizontal setback between the bottom outside face of the thickened edge and slope face.

City of Corona
-Building Division
Once during plan check;
As needed during site
grading and
construction
Plan check; As needed during
grading and construction
activities
Review of plans; On-site
inspection
Withhold grading or
building permit; Halt
grading and
construction activities
Mitigation Measure GEO-15: Sub-Grade Pre- Saturation. Prior to concrete placement, the soil sub- grade shall be thoroughly wetted to about 12 inches in depth at a moisture condition of about 2 to 3 percentage points above the optimum moisture content.

City of Corona
-Building Division
Once during plan check;
As needed during site
grading and
construction
Plan check; As needed during
grading and construction
activities
Review of plans; On-site
inspection
Withhold grading or
building permit; Halt
grading and
construction activities
Mitigation Measure GEO-16: General. Interior floor slabs and exterior concrete flatwork, including driveway, shall be properly designed for the construction and service loading conditions, potential settlements and soil expansion. The structural details, such as slab thickness, concrete strength, reinforcing criteria, joint spacing, etc. Shall be established by the project structural engineer.

The recommended minimum reinforcements for concrete slabs provided above are intended for preliminary design only.

More restrictive criteria as dictated by structural design or regulatory requirements shall govern.

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Mitigation Measure No./Implementing Action Responsible for Monitoring Monitoring Frequency Timing of Verification Method of Verification Verified Date/Initials
Sanctions for NonCompliance
Mitigation Measure GEO-17: Retaining Walls
• Foundations: Retaining wall foundations may be supported on either compacted engineered fill or competent bedrock. If a bedrock/fill transition is encountered, the bedrock portion shall be over- excavated minimum 2 feet and replaced with approved compacted fill. Alternatively, a cold joint shall be constructed in both the footing and the wall. Footings may be designed in accordance with the foundation design criteria presented in the Geotechnical Report when embedded at least two feet below lowest adjacent grade. Footings located on or at top of slopes shall be deepened, as necessary, to provide minimum lateral setback between footing and slope faces in accordance with CBC requirements.
• Lateral Earth Pressures: The earth pressures acting on retaining walls depend primarily on allowable wall movement, type of backfill materials, backfill slopes, wall inclination, surcharges, and any hydrostatic pressure.

The following lateral earth pressures are recommended for vertical walls with no hydrostatic pressure and no surcharge loading:

Wall Condition Backfill Type
Lateral Earth Pressure (Equivalent Fluid
Pressure) (pcf)
Level 2:1 (H:V)
Active (Cantilever) Sandy Soils 40 65
The surcharge effect of anticipated loads on the wall backfill (i.e. traffic, construction equipment, footings, etc.) shall be included in the wall design. If the wall is free to deflect, 33 percent of the maximum surcharge load located within a distance equal to the height of wall shall be used in the design. • Backfill: Retaining wall backfill shall consist of predominantly granular non-expansive soils. The backfill shall extend within a 45-degree plane from the wall footing. Retaining wall backfill shall be mechanically compacted to minimum 90 percent of the applicable laboratory maximum density and performed under the observation and testing of the Project Geotechnical Engineer. No jetting, ponding, or flooding shall be permitted. No backfill shall be placed against concrete until minimum design strengths are attained. • Backfill Drainage: The wall design shall include waterproofing and weep holes or sub-drains or back- drains, as appropriate, for relieving possible hydrostatic pressures. If on-site soils are utilized for wall backfill, the design shall include a prefabricated drainage blanket (such as Miradrain 2000, or equivalent). At a minimum, sub-drains shall consist of 4-inch diameter, perforated Schedule 40, PVC pipe or equivalent, embedded in approximately 3 cubic feet per lineal foot of ¾-inch (maximum) rock, or approved alternate. This permeable material shall be enveloped in Geofabric consisting of Mirafi 140 or equivalent. The pipe and trench bottom shall be sloped at a gradient of 2+ percent to a suitable discharge outlet. Sub-drains placed behind retaining walls shall be approved by the Project Geotechnical Engineer prior to backfill placement.

City of Corona
-Building Division
- Development Services Division
Once during plan check;
As needed during site
grading and
construction
Plan check; As needed during
grading and construction
activities
Review of plans; On-site
inspection
Withhold grading or
building permit; Halt
grading and
construction activities
Mitigation Measure GEO-18: Soil Corrosion. The previous geotechnical consultants, Pacific Soils Engineering, Inc., performed preliminary testing and indicated that the site soils are corrosive to metals. Therefore, representative finished grade samples shall be tested for corrosion suites (sulfate, chloride, pH and resistivity) upon completion of grading. It may be necessary to retain a corrosion engineer for consultation.

City of Corona
-Development Services Division
As needed during site
grading and
construction
As needed during grading and
construction activities
Review of test results; Halt grading and
construction activities
Mitigation Measure GEO-19: Utility Trench Backfill
• Bedding material shall consist of on-site sandy or imported materials exhibiting a San Equivalent (S.E.) value of 30 or greater.
• The on-site soils are considered suitable for trench backfill, provided they are free of organic materials and oversize rocks.
• Backfill of all exterior and interior trenches shall be placed in thin lifts not exceeding 4 inches and mechanically compacted to achieve a relative compaction of not less than 90% based on ASTM: D1157. Care shall be taken not to damage utility lines.
• Utility trenches shall not be located within the influence of footings. This is defined as a zone located below the footing and a line sloping at an inclination of 1:1 (horizontal to vertical) outward from the outside edge of City of Corona
-Building Division
-Development Services Division
Once during plan check;
As needed during site
grading and
construction
Plan check; As needed during
grading and construction
activities
Review of plans; On-site
inspection
Withhold grading or
building permit; Halt
grading and
construction activities

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Mitigation Measure No./Implementing Action Responsible for Monitoring Monitoring Frequency Timing of Verification Method of Verification Verified Date/Initials
Sanctions for NonCompliance
footings. If utility lines are located within the zone of footings, the backfill shall be compacted to a minimum 95 percent relative compaction or slurry backfilled (minimum 1-1/2 sack cemented sand mix. • To reduce potential water migration into building sub- grade through the granular bedding/shading layer and/trench backfill, utility trenches shall be backfilled with the onsite finer grained materials or sand-cement slurry for minimum 3 feet length at their entry points. • Trenches in fill soils and alluvial deposits greater than 4 feet in depth shall be shored or sloped back as required by the local regulatory agency, the state of California Division of Industrial Safety Construction Safety Orders, and Federal OSHA requirements.

Mitigation Measure GEO-20: Asphalt Concrete Pavement. Preliminary asphalt concrete pavement sections for the planned streets in the development were developed utilizing the Caltrans method of design and the structural section design guide for California cities and counties. The following recommended pavement sections were computed assuming an “r” value of 30 for site soils compacted as sub-grade material, and assumed traffic indices. The actual “r” value will depend on the soil conditions exposed at the planned street sub-grade elevations. During rough grading, “r” value testing shall be performed on the pavement sub-grade soils to confirm the pavement design basis. Further analysis and evaluation are necessary if the design traffic index and the sub-grade “r” value are different from those used in Ginter & Associates’ analyses.

Traffic
Index
Recommended Minimum Pavement
Section
Asphalt
Concrete
(inches)
Aggregate
Base
(inches)
Total
(inches)

5.0 6.0

7.0 8.0

3.0 4.0

4.0 5.0

6.0 8.0

10.0 12.0

9.0 12.0

14.0 16.0
Aggregate base shall consist of crushed aggregate base (CAB) or crushed miscellaneous base (CMB) and shall comply with the specifications outlined in the “Standard Specifications for Public Works Construction”, (“Green Book”). The base material shall be compacted to minimum 95 percent of the maximum laboratory density, determined in accordance with ASTM: D-1557. The soil sub-grade shall be compacted to minimum 90 percent relative compaction. The subgrade soils shall exhibit a firm and unyielding surface, in addition to the recommended minimum compaction. Final compaction and testing of pavement sub-grade shall be performed just prior to placement of aggregate base.

City of Corona
-Development Services Division
Once during plan check;
As needed during site
grading and
construction
Plan check; As needed during
grading and construction
activities
Review of plans; On-site
inspection
Withhold grading or
building permit; Halt
grading and
construction activities
Mitigation Measure GEO-21: Site Drainage. All roof and surface drainage shall be directed away from structures and their appurtenances and slopes to approved drainage facilities. Ponding of water shall be avoided. For graded soil areas, a minimum gradient of 2 percent away from structures shall be maintained. The drainage patterns designed by the project civil engineer shall be established at the time of fine grading and maintained throughout the life of the structure or, if altered, shall be replaced with a properly designed area drain system. Irrigation activities at the site shall be monitored and controlled to prevent overwatering. Planter areas adjacent to structures shall be avoided. If utilized, such planters shall include measures to contain irrigation water and prevent moisture migration into walls and under foundations and slabs-on-grade.

City of Corona
-Development Services Division
Once during plan check;
As needed during site
grading and
construction
Plan check; As needed during
grading and
construction activities
Review of plans; On-site
inspection
Withhold building
permit or Certificate of
Occupancy; Halt
grading and
construction activities
Mitigation Measure GEO-22: Slope Planting, Irrigation And Maintenance. General guidelines for slope planting, irrigation and maintenance are shown below:
a) Slope planting shall consist of appropriate drought resistant vegetation as recommended by the Landscape Architect. Landscaping of slopes shall be completed as soon as possible and properly maintained. b) The property owner is responsible for proper irrigation and for maintenance and repair of installed irrigation systems. Leaks shall be repaired immediately. Sprinklers shall be adjusted to provide maximum coverage with a minimum of water usage and overlap. Over-watering with consequent excessive runoff and ground saturation shall be avoided.
c) If automatic sprinkler systems are installed, their use shall be adjusted to account for natural rainfall conditions. d) All interceptor ditches, drainage terraces, down- drains, and any other drainage devices that have been installed shall be maintained and cleaned.

City of Corona
-Planning Division
Once during plan check;
As needed prior to
issuance of Certificate
of Occupancy
Plan check; As needed prior
to issuance of Certificate of
Occupancy
Review of plans; On-site
inspection
Withhold building
permit or Certificate of
Occupancy; Notify HOA
of violation

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Mitigation Measure No./Implementing Action Responsible for Monitoring Monitoring Frequency Timing of Verification Method of Verification Verified Date/Initials
Sanctions for NonCompliance
e) If rodent activity is present, the property owner shall undertake a program for the elimination of burrowing animals. This shall be an ongoing program in order to promote slope stability. f) Water shall not be allowed to flow over the constructed or natural slopes. This may require the construction of berms or ditches along the top of slopes, if such devices are not in place.

Mitigation Measure GEO-23: Additional Investigation. Additional geologic and geotechnical investigation may be necessary during the 40-scale grading plan review phase to obtain supplemental information relative to the site geologic conditions and engineering properties of on- site materials and to confirm the preliminary recommendations provided herein.

City of Corona
-Development Services Division
Once during plan check
for each phase of
development
Plan check for each phase of
development
Review of engineering
reports/plans
Withhold grading
permit

GREENHOUSE GAS EMISSIONS
Mitigation Measure GHG-1: Climate Action Plan Update Compliance. Prior to issuance of building permits, the Project Applicant shall demonstrate that appropriate building construction measures shall apply to achieve a minimum of 100 points per Appendix C to the City of Corona 2019 Climate Action Plan (CAP) Update. The conceptual measures anticipated for the Project are listed in Attachment C of the Project’s Air Quality and Greenhouse Gas Assessment (AQ/GHG Assessment), which is appended to this EIR Addendum as Technical Appendix C. The conceptual measures may be replaced with other measures as listed in the CAP Screening Tables (Appendix C to the CAP Update), as long as they are replaced at the same time with other measures that in total achieve a minimum of 100 points per Appendix C to the City of Corona CAP Update.

City of Corona
- Planning Division
Once prior to issuance
of building permits
Plan check Review of plans; On-site
inspection
Withhold grading
permit

HYDROLOGY AND WATER QUALITY
Mitigation Measure HYD-1: For Drainage Management Area C, the final engineering for the drainage of Area C shall include a concrete impact basin energy dissipater and rip-rap pad and shall be designed in accordance with City standards.

The outlet velocity shall be at or below the existing condition. The plans shall be submitted to the City for review and approval.

City of Corona
-Development Services Division
Once during plan check Plan check Review of plans Withhold grading and/or building permit

LAND USE AND PLANNING
Project Design Feature LU-1: The project applicant will survey and post the location of the private property boundary line where it abuts NFS lands within the project area.

City of Corona
-Planning Division
Prior to occupancy of
each phase of
development
Prior to issuance of Certificate
of Occupancy for each phase
of development
Visual inspection of project site
boundary adjacent to CNF Forest
Lands.

Withhold certificate of
occupancy
NOISE
Mitigation Measure NS-1: Construction and demolition shall be restricted to the hours of 7:00 A.M. to 8:00 P.M. Monday through Saturday, and 10:00 A.M. to 6:00 P.M. on Sundays and Federal holidays.

City of Corona
-Planning Division
-Building Division
During grading and
construction
Note on plans. Prior to
issuance of construction
permits/ Regular site
inspections and upon any
received complaints
Review of construction
documents/O n-site inspection
Withhold issuance of
construction permits/
Issuance of Stop work
notice until rectified
Mitigation Measure NS-2: Noise and groundborne vibration construction activities whose specific location on the project site may be flexible (e.g., operation of compressors and generators, cement mixing, general truck idling) shall be conducted as far as possible from the nearest noise-and vibration-sensitive land uses.

City of Corona
-Building Division
During grading and
construction
Note on plans. Prior to
issuance of construction
permits/ Regular site
inspections and upon any
received complaints
Review of construction
documents/O n-site inspection
Withhold issuance of
construction permits/
Issuance of Stop work
notice until rectified
Mitigation Measure NS-3: Construction and demolition activities shall be scheduled so as to avoid operating several pieces of equipment simultaneously, which causes high noise levels.

City of Corona
-Building Division
During grading and
construction
Note on plans. Prior to
issuance of construction
permits/ Regular site
inspections and upon any
received complaints
Review of construction
documents/O n-site inspection
Withhold issuance of
construction permits/
Issuance of Stop work
notice until rectified
Mitigation Measure NS-4: The use of construction equipment or construction methods with the greatest peak noise generation potential shall be minimized (i.e., use of drills, jackhammers).

City of Corona
-Building Division
During grading and
construction
Note on plans. Prior to
issuance of construction
permits/ Regular site
inspections and upon any
received complaints
Review of construction
documents/O n-site inspection
Withhold issuance of
construction permits/
Issuance of Stop work
notice until rectified
Mitigation Measure NS-5: The project contractor shall use power construction equipment with state-of-the-art noise shielding and muffling devices.

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Mitigation Measure No./Implementing Action Responsible for Monitoring Monitoring Frequency Timing of Verification Method of Verification Verified Date/Initials
Sanctions for NonCompliance
Mitigation Measure NS-6: Barriers such as, but not limited to, plywood structures of flexible sound control curtains shall be erected between the proposed project and the adjacent existing residences to the northeast and west, to minimize the amount of noise to the maximum extent feasible during construction.

City of Corona
-Planning Division
-Public Works Div.

Prior to issuance of
grading and building
permits/ During grading
and construction
Note on plans. Prior to
issuance of construction
permits/ Regular site
inspections and upon any
received complaints
Review of construction
documents/O n-site inspection
Withhold issuance of
construction permits/
Issuance of Stop work
notice until rectified
Mitigation Measure NS-7: All construction truck traffic shall be restricted to truck routes approved by the City of Corona Public Works Department, which shall avoid residential areas and other sensitive receptors to the extent feasible.

City of Corona
-Planning Division
-Building Division
Prior to issuance of
grading and building
permits/ During grading
and construction
Prior to issuance of
construction permits/ Regular
site inspections and upon any
received complaints
Review of construction
documents/O n-site inspection
Withhold issuance of
construction permits/
Issuance of Stop work
notice until rectified
Mitigation Measure NS-8: Adjacent land uses within 300 feet of the construction site shall be notified about the estimated duration and hours of construction activities at least 30 days before the start of construction.

City of Corona
-Planning Division
Once at least 30 days
prior to start of
construction activities
for each phase of
development
At least 30 days prior to start
of construction activities for
each phase of development
Verify proof of mailing Withhold grading
and/or building
permit(s)
Mitigation Measure NS-9: Prior to approval of any grading permits that require blasting activities and a blasting permit, the Project Applicant shall prepare and submit for City review and approval of a Blasting Noise and Vibration Monitoring and Abatement Plan (“Noise and Vibration Abatement Plan”). At a minimum, the required Noise and Vibration Abatement Plan shall include the following:
• Specified blasting hours, restricting blasting only to Monday through Friday and only between the hours of 8:00 a.m. and 3:00 p.m.
• Conceptual blast designs. Conceptual blast designs shall be based on “scaled distance” criteria (i.e., defined as the distance in feet between a blast drill hole and the structure of concern, divided by the square root of the explosives loading per delay period in pounds-units in feet per pound1/2). The scaled distance chosen for the initial design should be supported by statistical analysis indicating the resulting ground vibration will be less than the criteria set for the Project. The scaled distance used for production blasts may be modified based on the results of the test blast(s) but should be conservative enough to produce vibration and airblast levels within the project specifications. It should be noted that the conceptual blast designs are general and will need to be modified during the project based on actual conditions encountered in the field and the results of site-specific blasting.
• Test Blasts. One or more test blasts shall be performed in an area outside of critical distance of residential structures or other improvements of concern; the critical distance shall based on the scaled distance calculations with a 10 percent distance increase.
• Controlled Blasting Techniques. Include techniques and procedures to control and monitor flyrock, airblast, and ground vibration:
 Flyrock mitigation measures may include: soil cover, leaving alluvial materials in place over materials to be blasted, and/or blast mats.
 Crushed rock (i.e., 3/8”) should be used for stemming materials  Drill cuttings are not acceptable.
 All stemming materials should be tamped in-place.
• The Blasting Noise and Vibration Abatement Plan shall include procedures for the submittal of blast reports and record keeping.
• The Blasting Noise and Vibration Abatement Plan shall outline safety measures and procedures to notify property owners that blasting will occur.
• If specified vibration limits are exceeded, the Noise and Vibration Abatement Plan shall require blasting operations to cease immediately, and a revised blasting plan shall be submitted to the City of Corona. Blasting shall not resume until a revised blasting plan has been reviewed and the Contractor has expressed in writing the conditions that will be applied to further blasting work. • Pre-Blast Survey Requirements. The following measures shall be specified in the Noise and Vibration Abatement Plan:

City of Corona
-Fire Department
Prior to and during any
blasting-related events
Prior to issuance of grading
permits requiring blasting
activities and a blasting
permit, and during blasting
activities
Review of construction
documents/O n-site inspection
Withhold grading
and/or building
permit(s)

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Environmental Impact Report Addendum

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Mitigation Measure No./Implementing Action Responsible for Monitoring Monitoring Frequency Timing of Verification Method of Verification Verified Date/Initials
Sanctions for NonCompliance
 Prior to the commencement of any blasting, a pre-blast survey of the conditions of all existing property and aboveground utilities located within 1500 feet of any potential blasting areas shall be conducted or as specified by the City of Corona, whichever is a lesser distance.  Prior to the commencement of any blasting, notification of neighbors withing 1,500 feet of the blasting area shall be made via first class mail or hand delivery of written notice.  The pre-blast survey shall be conducted by a third-party company with a minimum of five years of experience performing pre-blast and similar type surveys.  The pre-blast survey shall include a photographic record of all visible and accessible structures, facilities, utilities, or other improvements. If property owners refuse surveys, provide copies of certified mail letters documenting attempts to provide the survey.
 The required surveys shall include a description of the interior and exterior condition of the various structures examined. Descriptions shall include the locations of any cracks, damage, or other existing defects and shall include information needed to identify and describe the defect, if any, and to evaluate the construction operations on the defect. Survey records shall include photos of all cracks and other damaged, weathered, or otherwise deteriorated structural conditions. If necessary, macro lenses and flash illumination shall be used to ensure defects are shown clearly in the photographs. Photos shall contain an accurate date stamp. No blasting shall occur prior to the completion of surveys of surrounding residential properties.
 Surveys shall be repeated at facilities or properties where damage concerns have been expressed by individual residents, property owners, or other concerned parties. Details of any observed changes to surveyed structures and documenting photos shall be reported and submitted.

Project grading and blasting contractors shall be required to ensure compliance with the Blasting Noise and Vibration Abatement Plan requirements and shall permit periodic inspection of the construction site by City of Corona staff or its designee to confirm compliance. The requirements of the Blasting Noise and Vibration Abatement Plan shall also be specified in bid documents issued to prospective construction contractors. The City of Corona shall review all monitoring reports to ensure compliance with the Blasting Noise and Vibration Abatement Plan and shall have the authority to stop all blasting activities on site if it is determined that blasting activities are not being conducted in conformance with the Blasting Noise and Vibration Abatement Plan. Additionally, project grading and blasting contractors shall be required to ensure compliance with the Corona Fire Department publication, “Explosives, Blasting and Pyrotechnics Permit Guidelines per 2022 CFC,” dated December 5, 2023, and included as Technical Appendix L of Addendum No. 1 to the Skyline Heights Project Environmental Impact Report.

PUBLIC SERVICES
Mitigation Measure PS-1: Prior to issuance of building permits, the project Applicant shall obtain CFD review and approval of the site plan, fuel modification plan, and project design features including, but not limited to roadway design to meet or exceed minimum fire and emergency access requirements including ingress/egress; driveway and fire lane width; turning radii inside and outside; grades/elevations; adequate on- site space to park CFD apparatus; fire hydrant sizing, spacing and locations; fire protection systems including automatic fire sprinkler systems and fire alarms installed in each residence; availability of adequate firefighting water flow; and approved building materials.

City of Corona
-Fire Department
-Building Division
Once at plan check and
prior to issuance of
building permits for
each phase of
development
Plan check and prior to
issuance of building permits
for each phase of
development
Review project plans and conduct
site inspections
Withhold building
permit(s)
Mitigation Measure PS-2: Prior to the issuance of building permits, the project Applicant shall pay the required service and development fees pursuant to the “Fire Facilities Fund” as amended in Chapter 3.36 of the CMC to the City of Corona for the public improvements and facilities associated with the CFD.

City of Corona
-Fire Department
-Building Division
Once prior to issuance
of building permits for
each phase of
development
Prior to issuance of building
permits for each phase of
development
Confirm fee payment Withhold building
permit(s)
Mitigation Measure PS-3: Prior to the issuance of building permits, the project Applicant shall reserve a portion of the project site for a future radio facility site, the specific size and location of which is subject to review and approval of CPD.

City of Corona
-Planning Division
-Fire Department
Once prior to issuance
of building permits for
each phase of
development
Prior to issuance of building
permits for each phase of
development
Review of plans to confirm radio
site provided, and acceptance/
verification testing in the field
Withhold building
permit(s)
Mitigation Measure PS-4: Prior to the issuance of building permits, the project Applicant shall pay the required service and development fees to the City of Corona for the public improvements and facilities associated with the CPD.

City of Corona
-Building Division
-Public Works Dept.

Once prior to issuance
of building permits for
each phase of
development
Prior to issuance of building
permits for each phase of
development
Confirm fee payment Withhold building
permit(s)
Mitigation Measure PS-5: Prior to the issuance of building permits, the project Applicant shall comply with the City of Corona Municipal Code (Chapter 16.35, Park Dedication and In Lieu Fees). The City’s subdivision map review authority City of Corona
-Building Division
Once prior to issuance
of building permits for
Prior to issuance of building
permits for each phase of
development
Confirm fee payment or land
dedication
Withhold building
permit(s)

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Environmental Impact Report Addendum

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Mitigation Measure No./Implementing Action Responsible for Monitoring Monitoring Frequency Timing of Verification Method of Verification Verified Date/Initials
Sanctions for NonCompliance
shall determine whether land dedication, an in lieu fee, or a combination of the two shall be required in conjunction with its approval of a subdivision map.
-Public Works Dept. each phase of
development
Mitigation Measure PS-6: Pursuant to Section 65995 of the California Government Code, the project Applicant shall pay the required SB 50 mitigation fees to the CNUSD.

City of Corona
-Building Division
Once prior to issuance
of building permits for
each phase of
development
Prior to issuance of building
permits for each phase of
development
Confirm fee payment Withhold building
permit(s)
Mitigation Measure PS-7: Prior to the issuance of a building permit for the construction of the proposed project, the project Applicant shall pay the required service and development fees pursuant to the Section 16.23.080 of the CMC and in the City’s Library Facility and Collection section of the Master Facility Plan to the City of Corona for the public improvements and facilities associated with the CPL.

City of Corona
-Building Division
-Public Works Dept.

Once prior to issuance
of building permits for
each phase of
development
Prior to issuance of building
permits for each phase of
development
Confirm fee payment Withhold building
permit(s)

TRANSPORTATION
Mitigation Measure TR-1: Intersection 3 – Paseo Grande at Ontario Avenue: If the project is developed prior to the construction of the Foothill Parkway Extension then prior to issuance of any building permit for the project, the Applicant shall install a traffic signal and design for two-phase operation.

City of Corona
-Public Works
Once prior to issuance
of building permits for
each phase of
development
Prior to issuance of building
permits for each phase of
development
Review project plans; on-site
inspection
Withhold building
permit(s)
Mitigation Measure TR-2: Intersection 4 - Border Avenue at Ontario Avenue: Prior to issuance of any building permit for the project, a traffic signal designed for two-phase operation shall be installed. Intersection improvements shall include:
1) restriping of the eastbound shared left-through lane and the exclusive right-turn lane on Ontario Avenue to an exclusive left- turn lane and a shared through-right turn lane and 2) restriping of the westbound shared left-through lane and the exclusive right-turn lane on Ontario Avenue to an exclusive left-turn lane and a shared through-right turn lane.

City of Corona
-Public Works Dept.

Once prior to issuance
of building permits for
each phase of
development
Prior to issuance of building
permits for each phase of
development
Review project plans; on-site
inspection
Withhold building
permit(s)
Mitigation Measure TR-3: Intersection 10 - Elysia Street at Foothill Parkway: Prior to issuance of any building permit for the project, the Applicant shall install a traffic signal and design for five-phase operation to the satisfaction of the City.

City of Corona
-Public Works Dept.

Once prior to issuance
of building permits for
each phase of
development
Prior to issuance of building
permits for each phase of
development
Review project plans; on-site
inspection
Withhold building
permit(s)
Mitigation Measure TR-4: Intersection 11 - Trudy Way at Foothill Parkway: Prior to issuance of any building permit for the project, the Applicant shall install a traffic signal and design for three-phase operation to the satisfaction of the City.

City of Corona
-Public Works Dept.

Once prior to issuance
of building permits for
each phase of
development
Prior to issuance of building
permits for each phase of
development
Review project plans; on-site
inspection
Withhold building
permit(s)
Mitigation Measure TR-5: Roadway Segment 2 – Paseo Grande between Ontario Avenue and Green River Road: If the project is developed prior to the construction of the Foothill Parkway Extension then the Applicant shall improve this roadway segment to a 4-Lane Secondary Roadway to the satisfaction of the City prior to issuance of any building permit for the project.

City of Corona
-Public Works Dept.

UTILITIES AND SERVICE SYSTEMS
Mitigation Measure UTIL-1: Prior to issuance of the first certificate of occupancy, the project Applicant shall pay the required Corona Utilities Department water connection fees as set forth in Section 13.04.040 and Section 13.14.050 of the CMC.

City of Corona
-Utilities Department
-Building Division
Once prior to issuance
of Certificate of
Occupancy for each
phase of development
Prior to the issuance of
building permits
Verify fee payment Withhold Certificate of
Occupancy
Mitigation Measure UTIL-3: Prior to the issuance of any demolition or construction permit, the project Applicant shall provide a copy of the receipt or contract indicating that the construction contractor shall only contract for waste disposal services with the City’s exclusive franchise contract hauler, Waste Management of the Inland Empire. The contract specifying recycled waste service shall be presented to the Utilities Department prior to approval of the first certificate of occupancy for the project.

City of Corona
-Utilities Department
Prior to the issuance of
any demolition or
construction permit
Prior to the issuance of any
demolition or construction
permit.

Copy of receipt or contract
provided by applicant to
Municipal Operations Division
Withhold demolition or
construction permit
Mitigation Measure UTIL-4: In order to facilitate on- site separation and recycling of construction related wastes, the construction contractor shall provide temporary waste separation bins on-site during demolition and construction activities.

City of Corona
-Public Works Dept.

Prior to issuance of
grading and building
permits/ During grading
and construction
Prior to issuance of
construction permits/ Regular
site inspections and upon any
received complaints
Review of construction
documents/O n-site inspection
Withhold issuance of
construction permits/
Issuance of Stop work
notice until rectified
Mitigation Measure UTIL-5: Waste Diversion. The project Applicant shall demonstrate a plan to ensure adherence to the City of Corona Waste Diversion Program, which diverts 75 percent of all waste away from landfills. The City shall ensure that the project proponent implements the waste diversion plan objectives. These requirements shall be specified in the City of Corona
-Planning Division
Once prior to issuance
of Certificate of
Prior to issuance of Certificate
of Occupancy for each phase
Review of CC&Rs/On- site
inspection
Withhold issuance of
Certificate of

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Environmental Impact Report Addendum

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Mitigation Measure No./Implementing Action Responsible for Monitoring Monitoring Frequency Timing of Verification Method of Verification Verified Date/Initials
Sanctions for NonCompliance
final architectural plans to be approved by the City of Corona Planning and Building Divisions prior to issuance of building permits.
-Building Division Occupancy for each
phase of development
; As needed during
operation
of development; As needed
during operation
Occupancy/ Notify HOA
of non- compliance

Corona City CouncilJuly 1, 2026

Corona City Council
July 1, 2026