Agenda packet — Corona City Council, August 5, 2026 (part 5 of 23)

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or allowed to establish opportunistically within the FMZs or landscape areas. The same selection restrictions would apply to SMAs and RPZs.
• Fire Walls. Because of property boundary constraints, a small portion on the eastern side of Planning Area 2 adjacent to the “Not A Part” area of the Project (i.e., TTM 36544R1 Lot Nos. 28 through 32), as well as in the southeast portion of Planning Area 3 (i.e., TTM 36544R1 Lot Nos. 1 and 2), are unable to achieve a minimum 100 feet of on-site fuel modification. To mitigate for the reduced FMZ, a 6-foot-tall noncombustible Concrete Masonry Unit (CMU) fire wall would be constructed in multiple locations along the property boundary line around TTM 36544R1 Lot Nos. 1 through 14, 28 through 32, 76 through 78, 85 through 97, 111 through 115, 121, 122, and 127 through 144 where the full 100 feet of onsite fuel modification cannot be achieved. Figure 13 shows the portions of the site that would require CMU fire walls. The fire walls would be installed to function as heat-deflecting walls.

In summary, the requirements and recommendations set forth in the Project’s FPP indicate how the Project would conform with required fire and building codes. The recommendations provided in the Project’s FPP have also been designed specifically for the proposed construction of structures within areas designated as VHFHSZ. When properly implemented on an ongoing basis, the fire protection strategies proposed in the Project’s FPP would significantly reduce the potential fire threat to vegetation on the community and its structures, as well as assist CFD in responding to emergencies within the Project site. The fire protection system provided for the Project site includes a redundant layering of code-compliant, fire-resistant construction materials and methods that have been shown through post-fire damage assessments to perform extremely well against wildfire and ember storm conditions. To address areas where the Project is unable to meet the minimum Fire Code standards due to site constraints, code-exceeding measures have been suggested to meet the intent of the provisions of the Fire Code.

The proposed Project would include up to 170-foot-wide fuel modification zones that would be in excess of code requirements, along with ignition resistant construction that would exceed the requirements of one of the most restrictive fire and building codes in the country. The use of these methods and materials along with ongoing maintenance would result in a community that would be highly defensible with minimal firefighting resource demands. Projects occurring within fire hazard severity zones and wildland urban interface areas with higher potential fire hazards represent lower overall fire safety risk when the buildings and community are built to ignition resistant levels as required by CFD. Conversely, older communities that do not include the ignition resistant strategies may occur in a location that represents lower potential fire hazards outside of a fire hazard severity zone or wildland urban interface, but may actually be at higher overall fire risk due to the vulnerabilities inherent in their construction. (Dudek, 2025, p. 94)
Modern infrastructure would be provided, and all structures are required to include interior, automatic residential fire sprinkler systems consistent with the City’s regulatory standards and National Fire Protection Association (NFPA) Standard No. 13-D. The Project’s FPP also provides guidance for vegetation maintenance for the proposed FMZs and landscaped areas on the Project site. The requirements and recommendations provided in the Project’s FPP have been designed specifically for the proposed Project. The analysis and its fire protection justifications as documented in the Project’s FPP are supported by fire science research, results from previous wildfire incidents, and fire agencies that have approved these concepts. The Project design would feature ignition-resistant construction, asphalt roads and parking stalls, sufficient water supply, and up to 170 feet of on-site fuel modification. (Dudek, 2025, p. 94)

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In addition, and assuming implementation of the Project’s proposed drainage system, implementation of the Project’s FMZs and other fire protection measures would ensure that future Project structures are not exposed to significant risks, including downslope or downstream flooding or landslides. Impacts would be less than significant.

Based on the preceding analysis, and assuming mandatory compliance with the recommendations provided in the Project’s FPP, the proposed Project would not exacerbate wildfire risks, and thereby expose Project occupants to, pollutant concentrations from a wildfire or the uncontrolled spread of a wildfire, and impacts would be less than significant. In addition, the Project would not expose people or structures to significant risks, including downslope or downstream flooding or landslides, as a result of runoff, post-fire slope instability, or drainage changes.

Compliance with the Project’s FPP would be required pursuant to SHP EIR Mitigation Measure PS-1, which has been modified herein to reference the Project’s FPP and to specifically require CFD review of implementing building permits and landscape plans for compliance with the FPP recommendations. Accordingly, with implementation of SHP EIR Mitigation Measure PS-1 and the recommendations of the Project’s FPP, the proposed Project would not result in any new impact not already analyzed in the SHP EIR or increase the severity of a significant impact previously identified and analyzed in the SHP EIR. c) Would the Project require the installation or maintenance of associated infrastructure (such as roads, fuel breaks, emergency water sources, power lines or other utilities) that may exacerbate fire risk or that may result in temporary or ongoing impacts to the environment? EIR Addendum No. 1 Finding: No Substantial Change from Previous Analysis. As described above under the analysis of Threshold b), the proposed Project would include FMZs that would extend up to 170 feet from all proposed structures on site, would include a 10-foot clearance zone along internal roadways that directly abut open space areas, and would include the installation of fire walls in certain locations. However, physical impacts associated with implementation of the Project’s fire protection measures, including the proposed FMZs, have been evaluated throughout this EIR Addendum under the appropriate subject heading. For example, the discussion and analysis of the Project’s potential impacts to biological resources in Subsection 2.4 accounts for physical impacts associated with development of the Project, including the Project’s FMZs and other fire protection measures, as previously shown on Figure 9. There are no impacts to the environment that could result from the Project’s FMZs and fire protection measures that have not already been addressed herein and/or in the SHP EIR, and all of the Project’s physical impacts to the environment would be reduced to less-than-significant levels with implementation of the SHP EIR mitigation measures (as modified/supplemented herein). Additionally, the Project’s proposed fire protection measures would reduce the Project site’s potential for wildfire hazards as compared to existing conditions, and there are no components of the Project that would exacerbate wildfire hazard risk. Accordingly, because the Project would not exacerbate fire risk, and because impacts to the environment associated with the Project’s FMZs and other fire protection measures would be reduced to lessthan-significant levels with implementation of the SHP EIR mitigation measures (as modified/supplemented herein), Project impacts due to fire protection infrastructure would be less than significant. Therefore, the proposed Project would not result in any new impact not already analyzed in the SHP EIR or increase the severity of a significant impact previously identified and analyzed in the SHP EIR.

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2.20 Mandatory Findings of Significance
New
Significant
Impact
More
Severe
Impacts
New Ability to
Substantially
Reduce
Significant
Impact
No Substantial
Change from
Previous
Analysis
a. Does the Project have the potential to substantially degrade the quality of the environment, substantially
reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below selfsustaining levels, threaten to eliminate a plant or animal community, substantially reduce the number
or restrict the range of a rare or endangered plant or
animal or eliminate important examples of the major
periods of California history or prehistory?
☐ ☐ ☐ ☒
b. Does the Project have impacts that are individually
limited, but cumulatively considerable?
(“Cumulatively considerable” means that the
incremental effects of a project are considerable when
viewed in connection with the effects of past projects, the effects of other current projects, and the effects
of probable future projects)?
☐ ☐ ☐ ☒
c. Does the Project have environmental effects which
will cause substantial adverse effects on human
beings, either directly or indirectly?
☐ ☐ ☐ ☒

ENVIRONMENTAL ANALYSIS
a) Does the Project have the potential to substantially degrade the quality of the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, substantially reduce the number or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California history or prehistory? EIR Addendum No. 1 Finding: No Substantial Change from Previous Analysis. The SHP EIR identified significant and unavoidable impacts under the issue areas of aesthetics only. The Project would not result in any new or increased impacts to aesthetics, and in fact the analysis presented herein in Subsection 2.1 demonstrates that the proposed Project’s impacts to aesthetics would be reduced in comparison to what was evaluated and disclosed by the SHP EIR due to the Project’s proposed increase in open space areas by 22.0% and the reduction in the number of dwelling units proposed on site by 16 units as compared to the Approved Project. As indicated in the discussion and analysis presented herein in Subsection 2.4, with implementation of the SHP EIR mitigation measures (as modified/supplemented herein), the Project’s impacts to biological resources, including wildlife habitat and sensitive wildlife species, would be reduced to below a level of significance. The analysis provided herein in Subsection f) demonstrates that with mitigation to address the potential for uncovering previously undiscovered

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resources, the Project’s impacts to cultural resources, including historical and archaeological resources, would be reduced to less-than-significant levels. Accordingly, the Project would not substantially degrade the quality of the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, substantially reduce the number or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California history or prehistory, and impacts would be less than significant. Therefore, implementation of the Project would not result in any new impacts not already analyzed in the SHP EIR or increase the severity of a significant impact previously identified and analyzed in the SHP EIR. b) Does the Project have impacts that are individually limited, but cumulatively considerable? (“Cumulatively considerable” means that the incremental effects of a project are considerable when viewed in connection with the effects of past projects, the effects of other current projects, and the effects of probable future projects)?
EIR Addendum No. 1 Finding: No Substantial Change from Previous Analysis. Cumulative effects that would result from implementation of the Project have been evaluated throughout this EIR Addendum, which concludes that such impacts would not occur, would be less than significant, or would be reduced to a level below significant with implementation of the mitigation measures specified by the SHP EIR (as modified/ supplemented herein), standard City Conditions of Approval (COAs), and/or regulatory requirements. Additionally, this EIR Addendum concludes that the Project as proposed would not result in any new or more severe cumulative effects beyond what was already evaluated and disclosed by the SHP EIR. All applicable mitigation measures identified as part of the SHP EIR and that were imposed to address cumulatively-considerable effects would continue to apply to the Project as revised, except as modified or supplemented by this Addendum to the SHP EIR. The analysis throughout this EIR Addendum demonstrates that all Project impacts would be less than significant, or would be reduced in comparison to the analysis and conclusions of SHP EIR. Additionally, the analysis herein demonstrates that physical impacts associated with the Project (e.g., biological resources, cultural resources, geology/soils, etc.) would not substantially change or increase compared to the analysis presented in SHP EIR, and there have been no changed circumstances since the certification of the SHP EIR that would result in any new or increased significant impacts.

Therefore, because the Project would have similar or reduced cumulative impacts to the environment as compared to what was evaluated and disclosed in SHP EIR, the Project would not result in any new or increased impacts to the environment beyond what was evaluated, disclosed, and mitigated for by the SHP EIR. Therefore, implementation of the Project would not result in any new impacts not already analyzed in the SHP EIR or increase the severity of a significant impact previously identified and analyzed in the SHP EIR. c) Does the Project have environmental effects which will cause substantial adverse effects on human beings, either directly or indirectly?
EIR Addendum No. 1 Finding: No Substantial Change from Previous Analysis. The Project’s potential to result in substantial adverse effects on human beings has been evaluated throughout this EIR Addendum (e.g., Air Quality, Geology/Soils, Noise, etc.). Where potentially significant impacts are identified, mitigation measures from the SHP EIR have been imposed, as modified or supplemented by this EIR Addendum to the SHP EIR, to reduce these adverse effects to a level below significance. There are no components of the Project that could result in substantial adverse effects on human beings that are not already evaluated and disclosed throughout this EIR Addendum and/or by the SHP EIR. Accordingly, no additional impacts would occur. Therefore, implementation of the Project

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would not result in any new impacts not already analyzed in the SHP EIR or increase the severity of a significant impact previously identified and analyzed in the SHP EIR.

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3.0 REFERENCES
Cited As: Source:
(BFSA, 2023a) BFSA Environmental Services, 2023a. Phase I Cultural Resources Assessment for the Skyline Heights Project. October 26, 2023. Included as EIR Addendum Technical Appendix E.
(BFSA, 2023b) BFSA Environmental Services, 2023b. Paleontological Sensitivity Update and Revised Monitoring Recommendations for the Skyline Heights Project, City of Corona, Riverside County, California (Sch. No. 2014021003). October 26, 2023. Included as EIR Addendum Technical Appendix F.
(CalRecycle,
2024a)
CalRecycle, 2024a. El Sobrante Landfill November 2024 Tonnage Report. November 2024.

Accessed February 3, 2025. Available online:
https://secure.calrecycle.ca.gov/SWISDocument/Document/Download/485002 (CalRecycle,
2024b)
CalRecycle, 2024b. Lamb Canyon Landfill October 2024 Tonnage Report. October 2024.

Accessed February 3, 2025. Available online:
https://secure.calrecycle.ca.gov/SWISDocument/Document/Download/482777 (CalRecycle,
2024c)
CalRecycle, 2024c. Badlands Landfill December 2024 Tonnage Report. December 2024.

Accessed February 3, 2025. Available online:
https://secure.calrecycle.ca.gov/SWISDocument/Document/Download/487361 (Caltrans, 2020) California Department of Transportation (Caltrans), 2020. Vibration Manual. April 2020.

Available online: https://dot.ca.gov/-/media/dot-media/programs/environmentalanalysis/documents/env/tcvgm-apr2020-a11y.pdf (CEC, 2022) California Energy Commission, 2022. 2022 Building Energy Efficiency Standards FAQ.

August 2022. Available online: https://www.energy.ca.gov/sites/default/files/2022- 12/CEC-400-2022-010_CMF.pdf
(CFD, 2023) Corona Fire Department, 2023. Explosives, Blasting and Pyrotechnics Permit Guideline per 2022 CFC. December 5, 2023. Included as EIR Addendum Technical Appendix L. (CGS, 2014) California Geological Survey, 2014. Mineral Land Classification Map. 2014. (Included in the Project’s Administrative Record)
(Corona, 2014) City of Corona, 2014. NOP for the SHSP EIR. January 31, 2014. (Included in the Project’s Administrative Record)
(Corona, 2015) City of Corona, 2015. Skyline Heights Project EIR. December 2015. Included as EIR Addendum Technical Appendix A.
(Corona, 2016) City of Corona, 2016. Recirculated SHSP EIR. November 2016. (Included in the Project’s Administrative Record)
(Corona, 2019a) City of Corona, 2019a. City of Corona Climate Action Plan. March 2019. Accessed February 3, 2025. Available online:
https://www.coronaca.gov/home/showpublisheddocument/18422/63723935396207000 0 (Corona, 2019b) City of Corona, 2019b. City of Corona General Plan EIR. 2019. Accessed February 3, 2025.

Available online: https://www.coronaca.gov/government/departmentsdivisions/planning-division/general-plan-update

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Cited As: Source:
(Corona, 2020) City of Corona, 2020. General Plan. June 3, 2020. Accessed December 13, 2024. Accessed February 3, 2025. Available online:
https://www.coronaca.gov/home/showpublisheddocument/25479/63849403903237000 0 (Corona, 2021) City of Corona, 2021. 2020 Urban Water Management Plan. June 16, 2021. Accessed February 3, 2025. Available online:
https://www.coronaca.gov/home/showpublisheddocument/20292/63761240271340000 0 (Corona, 2024) City of Corona, 2024. City of Corona Municipal Code. 2024. Accessed February 3, 2025.

Available online: https://codelibrary.amlegal.com/codes/corona/latest/corona_ca/0-0-0- 54679
(DTSC, n.d.) Department of Toxic Substances Control (DTSC), n.d. Cortese List. Accessed February 3, 2025/ Available online: https://dtsc.ca.gov/dtscs-cortese-list/ (Dudek, 2025) Dudek, 2024. Fire Protection Plan, September 2025. Included as EIR Addendum Technical Appendix K.
(FEMA, 2008a) Federal Emergency Management Agency, 2008a. FIRM 06065C1351G. August 28, 2008.

Accessed February 3, 2025. Available online:
https://msc.fema.gov/portal/downloadProduct?productTypeID=FINAL_PRODUCT&produc tSubTypeID=FIRM_PANEL&productID=06065C1353G
(Google Earth,
2024)
Google Earth Pro, 2024. Google Earth Viewer (application). Aerial Photograph dated May 9, 2024. Available online: https://www.google.com/earth/download/gep/agree.html (KWC Engineers,
2025a)
KWC Engineers, 2025a. Preliminary Hydrology/Hydraulics Report. February 2025. Included as EIR Addendum Technical Appendix H1.
(KWC Engineers,
2025b)
KWC Engineers, 2025b. Project Specific Water Quality Management Plan. June 23, 2025.

Included as EIR Addendum Technical Appendix H2.
(L&L, 2024) L&L Environmental, Inc. 2024. An Updated Biological Resources Assessment and Crotch Bumble Bee Survey. November 2024. Included as EIR Addendum Technical Appendix D1. (L&L, 2025) L&L Environmental, Inc. 2024. Determination of Biologically Equivalent or Superior Preservation Report. January 2025. Included as EIR Addendum Technical Appendix D2. (LGC, 2019a) LGC Geotechnical, Inc. 2019a. Geotechnical Rough Grading Plan Review for the Proposed Skyline Heights Residential Development, Tract No. 36544, City of Corona, California.

January 30, 2019. Included as EIR Addendum Technical Appendix G1. (LGC, 2019b) LGC Geotechnical, Inc. 2019b. Updated Fault Evaluation for the Proposed "Skyline Heights" Residential Development, Tract No. 36544, City of Corona, California. January 22, 2019.

Included as EIR Addendum Technical Appendix G1.
(RCA, 1996) Regional Conservation Authority, 1996. Habitat Conservation Plan for the Stephens’ Kangaroo Rat in Western Riverside County California. March 1996. Available online:
https://www.rchca.us/DocumentCenter/View/549/SKR-Habitat-Conservation-Plan

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Cited As: Source:
(RCA, n.d.) Regional Conservation Authority, n.d. RCA MSHCP Information Map. No date. Accessed February 3, 2025. Available online:
https://wrcrca.maps.arcgis.com/apps/webappviewer/index.html?id=2b9d4520bd5f4d35a dd35fb58808c1b7
(RCIT, n.d.) Riverside County Information Technology (RCIT), n.d. Riverside County GIS. No date.

Accessed February 3, 2025. Available online: https://rcitgiscountyofriverside.hub.arcgis.com/ (Riverside County
ALUC, 1993)
County of Riverside Airport Land Use Commission, 1993. Corona Municipal Airport Comprehensive Land Use Plan. March 17, 1993. Accessed December 13, 2024. Available on-line: https://rcaluc.org/sites/g/files/aldnop421/files/migrated/Portals-13-PDFGeneralplan-oldplan-Corona-20Municipal-20Airport.PDF.pdf (RWQCB, 2019) Regional Water Quality Control Board, 2019. Santa Ana River Basin Plan. June 2019.

Accessed February 3, 2025. Available online:
https://www.waterboards.ca.gov/santaana/water_issues/programs/basin_plan/ (SCAG, 2024) Southern California Association of Governments, 2024. Connect SoCal. April 4, 2024.

Accessed December 13, 2024. Available on-line: https://scag.ca.gov/sites/main/files/fileattachments/23-2987-connect-socal-2024-final-complete-040424.pdf?1714175547 (UC, 2023) Urban Crossroads, 2023. Noise and Vibration Analysis. December 11, 2023. Included as EIR Addendum Technical Appendix I.
(UC, 2024) Urban Crossroads, 2024. Skyline Heights Air Quality & Greenhouse Gas Assessment.

February 14, 2024. Included as EIR Addendum Technical Appendix C. (UC, 2025) Urban Crossroads, 2025. Traffic Analysis. January 23, 2025. Included as EIR Addendum Technical Appendix J.
(USCB, 2024) United States Census Bureau, 2024. Quick Facts Corona City, California. July 1, 2024.

Accessed February 3, 2025. Available on-line:
https://www.census.gov/quickfacts/fact/table/coronacitycalifornia/PST045224

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4.0 MITIGATION MONITORING AND REPORTING PROGRAM (MMRP)
Mitigation Measure No./Implementing Action Responsible for Monitoring Monitoring Frequency Timing of Verification Method of Verification Verified Date/Initials
Sanctions for NonCompliance

BIOLOGICAL RESOURCES
Mitigation Measure BIO-MM1. The project impact areas and avoidance areas shall be flagged or fenced prior to clearing to prevent incursion into unsurveyed or avoided areas. A qualified biological monitor(s) shall monitor work activities during the initial clearing and grading phase of construction (including any ground or vegetation disturbance, demolition, fence installation, grading of existing roads, material delivery, etc.). The monitoring biologist shall ensure the flagging or fencing remains intact and no incursions into avoided areas occurs. The monitoring biologist shall examine each area of impact as the clearing/grading operations move into an uncleared native habitat area or into any area that has had a lapse in construction for more than 30 days to ensure no sensitive wildlife species are present. The biologist shall inspect debris piles, pipes, burrows, vegetation, leaf litter piles, and other potential refugia for sensitive wildlife species prior to initiation of clearing, grubbing, grading, or any other Project activity that may injure or kill sensitive wildlife species.

If wildlife is discovered, the biological monitor shall take appropriate action as defined in the mitigation measures, permit conditions, and regulations. The biological monitor may move wildlife or humanely encourage it to move out of harm’s way, if safe and feasible and permitted to do so. Potential day roosts for pallid bat (e.g., caves, crevices, mines, hollow trees, buildings, etc.) shall be inspected by a qualified bat biologist prior to initial ground disturbance. If bats are roosting, a bat exclusion plan shall be prepared and submitted to CDFW for review prior to impacts. If a colony is discovered during the breeding season (March 1 -October 1), the biologist shall determine appropriate avoidance measures, including, but not limited to sound walls, buffers, and Project phasing/timing, to prevent disturbance to the colony until all young are weaned and capable of foraging independently.

Monitoring and survey activities shall be documented on a daily basis. All monitoring reports and communications shall be retained in Project files to allow review by the City of Corona, CDFW, and USFWS, if requested.

City of Corona
-Planning Division
Once prior to site
clearing or grading
activities for each phase
of development
Prior to issuance of grading
permit, site clearing or
grading activities for each
phase of development
On-site inspection Withhold grading
permit
Mitigation Measure BIO-MM2. Special Status Botanical Species. The following measures shall apply to address and minimize potential impacts to Coulter’s matilija poppy, intermediate mariposa lily, and chaparral nolina to the extent feasible.
• Impacts shall be minimized and avoided to the extent feasible. Prior to commencement of ground-disturbing activities (i.e., clearing and grading), Coulter’s matilija poppy and intermediate mariposa lily plants within the development footprint shall be salvaged for use in the Project area, avoidance area, or reuse in local restoration projects. In addition, a qualified botanist shall collect seeds from plants within the grading impact area during the spring or summer before grading commencement.
• Prior to commencement of ground-disturbing activities (i.e., clearing and grading), impacts to chaparral nolina shall be mitigated through translocation and seed collection with propagation to an on-site or off‐site preserved property acceptable to the City. The property shall be composed of habitat characteristics suitable to support chaparral nolina, including but not limited to: appropriate soils, elevation, and supporting chaparral or coastal sage scrub (or a combination thereof) habitat. The property shall be conserved via recordation of a conservation easement or deed restriction in favor of a California Department of Fish and Wildlife (CDFW)-due diligence approved local conservation entity to protect chaparral nolina on the property in perpetuity. Alternatively, the land may be transferred in fee title to a CDFW-approved local conservation entity. A management fund shall be established by the Applicant and will consist of an interest-bearing account with the amount of capital necessary to generate sufficient interest and/or income to fund all monitoring, management, and protection of the conservation area(s), including but not limited to, reasonable administrative overhead, biological monitoring, invasive species and trash removal, signage replacement and repair, law enforcement measures, long-term management reporting (as described below), and other actions designed to maintain and improve the habitat of the conserved land(s), in perpetuity.
• Prior to commencement of ground-disturbing activities, a Property Analysis Record, or substantially equivalent analysis, shall be conducted by the Applicant and approved by the City to determine the management needs and costs described above, which then will be used to calculate the capital needed for the management of the fund.

This management fund shall be held and managed by a CDFW-approved local conservation entity. To protect the mitigation area(s), the Project Applicant shall place appropriate signage around the perimeter of each site.

Except for uses appropriate to a habitat conservation area, the public shall not have access to the mitigation area(s), and no activities shall be permitted within the mitigation areas, except maintenance of habitat, including City of Corona
-Planning Division
Once prior to site
clearing or grading
activities for each phase
of development
Prior to issuance of grading
permit, site clearing or
grading activities for each
phase of development
Review of conservation plans by
project biologist and mitigation
planting plan, conservation
easement, or deed restriction;
and On-site inspection
Withhold grading
permit

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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
the removal of nonnative plant species, trash, and debris, and the installation of native plant materials. Prior to any ground disturbance, the Applicant shall prepare a Chaparral Nolina Planting Plan (Plan) for chaparral nolina.

The Plan shall require a replacement ratio of 1:1 by area, and ensure a minimum 90 percent survivorship at the end of a five-year monitoring period, which shall be verified by the monitoring biologist (minimum qualifications of the monitoring biologist are specified below). At a minimum, the five-year plan shall include the following information:

1. a description of the existing conditions of the receiver site(s) characterizing the suitability of the site(s) for chaparral nolina, and documenting the acreage of the site,

2. a description of how the site will be preserved in perpetuity, e.g., conservation easement, deed restriction, etc., and the name of the CDFW-approved due diligence entity that will hold the easement/deed restriction, etc.,

3. qualifications of the monitoring biologist. At a minimum the monitoring biologist will possess a minimum of five-year's experience conducting habitat restoration projects in coastal sage scrub and/or chaparral habitat in Riverside County, California,

4. receiver site preparation for transplanting,

5. goals for success,

6. schedule,

7. propagation techniques,

8. transplant and seedling installation methods,

9. plant spacing,

10. performance criteria for success, including provision for control of non-native and invasive species,

11. monitoring and reporting procedures for each of the five years of the monitoring period,

12. adaptive management strategies, including a contingency plan should the site fail to meet the specified success criteria, and

13. maintenance requirements that will be reviewed and approved by the City. The Plan shall also ensure a mixture of both male and female plants.

Mitigation Measure BIO-MM3. Compensation Parcel. Prior to issuance of a grading permit, the project Applicant shall preserve a minimum of ten (10) acres (a 1:1 ratio) of natural habitat, which shall be biologically equivalent or superior to the Public/Quasi-Public (PQP) land the project site surrounds, and shall be located adjacent to USFS land. The compensation parcel shall either be:

1. Deeded in fee title to the United States Forest Service (USFS) or Western Riverside County Regional Conservation Authority (RCA) to ensure appropriate protection and permanent habitat management in perpetuity, or

2. Conserved via recordation of a conservation easement or deed restriction in favor of a CDFW-due diligence approved local conservation entity.

City of Corona
-Planning Division
Once prior to site
clearing or grading
activities for each phase
of development
Prior to issuance of grading
permit, site clearing or
grading activities for each
phase of development
Proof of conservation easement
or deed restriction; On-site
inspection
Withhold grading
permit
Mitigation Measure BIO-MM4. Designate Unimpacted Areas as Open Space. Prior to recordation of Final Maps for each phase of the proposed development, those areas of the project site not impacted by the project footprint, including Riparian/Riverine and excluding the minimum 10-acre preservation area identified in BIO-MM3, shall be conserved in perpetuity via the recordation of a conservation easement or deed restriction in favor of a CDFW-approved local conservation entity; or transferred in fee title to a CDFW-approved local conservation entity. The avoided Riparian/Riverine areas shall be conserved prior to issuance of a grading permit. The CDFW-approved local conservation entity shall manage the conservation areas to protect the long-term conservation, functions and values in-perpetuity.

City of Corona
-Planning Division
Once prior to Final Map
recordation for each
phase of development
Prior to Final Map recordation
for each phase of
development
Proof of conservation easement
or deed restriction; On-site
inspection
Withhold Final Map
approval and
recordation
Mitigation Measure BIO-MM5. Other Species to Avoid in Landscaping. Prior to issuance of grading permits, building permits, and/or road improvement plans, the Project Applicant shall prepare a landscape plan for review and approval by the City of Corona The landscape plan shall prohibit the use of more common cultivar forms of Coulter’s matilija poppy to the list of plants to be avoided in site landscaping, including White Cloud matilija poppy. Additional non-native plants that shall not be planted within any onsite mitigation or landscaping include coyote brush (Baccharis pilularis) and fourwing saltbush (Atriplex canescens). In addition, the landscape plan shall exclude those species identified in Table 6-2, Plants that Should be Avoided Adjacent to the MSHCP Conservation Area, of the Western Riverside County Multiple Species Habitat Conservation Plan (MSHCP). To ensure these non-native plants are not used in landscaping within the project site, the project Applicant shall include a list of plant species to avoid within the CC&Rs for the development. The project applicant City of Corona
-Planning Division
Once prior to issuance
of building permits
Prior to issuance of the first
building permit for the
production units and review
of HOA
landscape plans.

Review of CC&Rs; On- site
inspection
Withhold building
permit

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shall also develop and distribute a suitable homeowner education package to residents / new owners covering the species to avoid
Mitigation Measure BIO-MM6. Oak Tree Replacement. The project Applicant shall replace oak trees impacted by the project at a ratio consistent with the City of Corona oak tree conservancy policy (10.10.5), at no less than a 2:1 ratio.

Replacement trees shall be located in undeveloped natural areas suitable to support these trees or in onsite mitigation areas where possible. If spacing requirements limit the number of replacement trees in these areas additional plantings may be located in landscaped areas as close to open space as feasible. All replacement trees shall be planted prior to issuance of the Certificate of Occupancy.

City of Corona
-Planning Division
Once prior to issuance
of Certificate of
Occupancy for each
phase of development
Review of HOA
landscape plans and prior to
issuance of Certificate of
Occupancy for each phase of
development
On-site inspection Withhold Certificate of
Occupancy
Mitigation Measure BIO-MM7. Riparian/Riverine. Prior to issuance of a grading permit, the project Applicant shall provide mitigation for ±10.5107 acres of Riparian/Riverine impacts at no less than a 2:1 basis, as determined through consultation with the City of Corona and Wildlife Agencies based on their approval of the Determination of Biologically Equivalent or Superior Preservation (“DBESP”; see SHP EIR Addendum No. 1 Technical Appendix D2) that provides a functions and values analysis pursuant to the requirements of the MSHCP. If offsite mitigation is incorporated, the preferred choice shall be to find mitigation within or adjacent to the Santa Ana Watershed and in or adjacent to Corona if possible. In addition, some avoided resources within the open space areas shall be preserved to the extent feasible pursuant to a deed restriction or other appropriate legal mechanism to prevent future development.

If onsite mitigation is proposed as an alternative mitigation, a Habitat Mitigation and Monitoring Plan (HMMP) shall be developed and provided for review and approval by local and regulatory agencies, and shall include at a minimum the following components:
• Quantitative success criteria (vegetation cover and species richness); • Recommendations for soil preparation;
• A plant palette to include native species occurring on the site, such as coast live oak and Coulter’s matilija poppy; • Planting methods;
• Irrigation and maintenance requirements; and
• A long-term mitigation maintenance and monitoring plan with remedial measures.

City of Corona
-Planning Division
Once prior to issuance
of grading permit for
each phase of
development
Prior to issuance of grading
permit for each phase of
development
Proof of mitigation credits,
conservation easement or deed
restriction; On-site inspection
Withhold grading
permit
Mitigation Measure BIO-MM8. Storm Water Pollution Prevention Plan. Prior to the issuance of a grading permit, the project Applicant shall prepare for City of Corona review and approval of a Stormwater Pollution Prevention Plan (SWPPP), which shall identify all standard best management practices (BMPs) to prevent discharges from entering avoided jurisdictional drainages during construction. The required SWPPP shall at a minimum include BMPs that include but are not limited to:
• Use of erosion control or sedimentation prevention methods, such as fiber rolls, sand bags, rice mats, straw wattles, or similar measures, where appropriate; and
• Proper use and disposal of oil, gasoline, diesel fuel, antifreeze, and other toxic substances will be enforced.

Compliance with the City-approved SWPPP shall be required as a condition of grading permit approval, compliance with the SWPPP shall be required by bid documents issued to prospective construction contractors, and the Project construction contractors shall permit periodic inspection of the construction site by City of Corona staff or its designee to confirm compliance during all construction activities.

City of Corona
-Development Services Division
Once prior to site
clearing for each phase
of development
Prior to site clearing for each
phase of development
Review of SWPPP Withhold grading
permit
Mitigation Measure BIO-MM9. Regional Water Quality Control Board Permit. Prior to the issuance of a grading permit, to mitigate for the loss of 1.48 acres and temporary loss of ±0.25-acre of State waters regulated by the Santa Ana Regional Water Quality Control Board (via issuance and implementation of a Clean Water Act [CWA] Section 401 Certification) to replace permanently-impacted State waters as specified by the agreement with RWQCB at not less than a 2:1 basis, through offsite acquisition and preservation, participation in an approved mitigation bank, and/or on or offsite creation, enhancement, or reestablishment of State waters or a combination of these options. Temporary impacts to RWQCB State waters shall be mitigated through on-site restoration within the temporarily impacted areas or as otherwise specified by the CWA Section 401 certification. The exact ratio shall be based on a functions and values assessment included in the Project’s Determination of Biologically Equivalent or Superior Preservation (“DBESP”; see SHP EIR Addendum No. 1 Technical Appendix D1) and pursuant to RWQCB’s approval. Preparation of a Habitat Mitigation and Monitoring Plan (HMMP) outlining the details of the mitigation shall be required for any on-site mitigation or off-site mitigation on lands not already subject to an RWQCB-approved HMMP.

City of Corona
-Planning Division
Once prior to issuance
of grading permit for
each phase of
development
Prior to issuance of grading
permit for each phase of
development
Proof of Agreements and
regulatory permits
Withhold grading
permit
Mitigation Measure BIO-MM10. California Department of Fish and Wildlife Permit. Prior to the issuance of a grading permit, to mitigate for the loss of ±10.51 acres of streambed and wetlands and the temporary loss of ±1.13 acres of streambed due to project construction, the project Applicant shall enter into an agreement with the California Department City of Corona
-Planning Division
Once prior to issuance
of grading permit for
Prior to issuance of grading
permit for each phase of
development
Review of Agreements/ permits Withhold grading
permit

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of Fish and Wildlife (CDFW) via issuance and implementation of a Section 1600 Streambed Alteration Agreement to replace affected streambed at not less than a 2:1 basis (mitigation:impact) for permanent impacts and restoration of temporarily impacted areas to their existing/former condition, as specified by the California Department of Fish and Wildlife, through a combination of offsite acquisition and preservation, participation in an approved mitigation bank, and/or on or offsite creation, enhancement, or reestablishment of the streambed. The exact ratio shall be based on a functions and values assessment pursuant to CDFW’s approval of the required Streambed Alteration Agreement. Preparation of a Habitat Mitigation and Monitoring Plan (HMMP) outlining the details of the mitigation shall be required for on-site mitigation or off-site mitigation on lands not already subject to a CDFW-approved HMMP. each phase of
development
Mitigation Measure BIO-MM11. Nesting Birds. To prevent impacts to sensitive, migratory, and nesting birds (including raptors), clearing, or other work in native habitats shall be avoided during the critical nesting period of January 1 – September 1. If work cannot be avoided during this timeframe, a nesting bird survey shall be conducted by a qualified biologist within three (3) days prior to initiation of clearing and/or grading. A letter report documenting the clearance survey and its results shall be provided to the City of Corona prior to any disturbance to the Project site. If nesting birds are present, a nesting bird plan shall be developed and implemented to include appropriate measures to mitigate potential impacts, including maintaining a buffer area until fledging has occurred. Active bird nests shall be mapped utilizing a handheld global positioning system (GPS) (getting as close as possible without disturbing the nest) and a buffer will be flagged around the nest (typically 300 feet for most species, 500-foot buffer for raptor nests), as determined appropriate by the biologist. Construction should not be permitted within the buffer area while the nest continues to be active (eggs, chicks, etc.). Once fledging has occurred no further avoidance is required.

City of Corona
-Planning Division
- Development Services Division
Once at plan check
(review of construction
bid documents); Once
prior to construction
activities in undisturbed
areas for each phase of
development
Plan check (review of
construction bid documents);
Prior to construction activities
in undisturbed areas for each
phase of development
Review of nesting bird survey if
done during nesting season.

Withhold grading
and/or building permit;
Halt construction
activities
Mitigation Measure BIO-MM12. Burrowing Owl. A pre-construction burrowing owl clearance survey shall be conducted by an experienced burrowing owl biologist no more than 30 days before earth disturbance (construction). The survey will be conducted as close to the actual construction initiation date as possible. A letter report documenting the clearance survey and its results shall be provided to the City of Corona prior to any disturbance to the Project site and prior to commencement of grading activities. If owls are present, the project biologist shall consult with local and state agencies, as appropriate, and develop a mitigation plan. Mitigation will be based on the following goals and requirements included in the MSHCP:

1. If the site contains or is part of an area supporting less than 35 acres of suitable habitat or the survey reveals that the site and the surrounding area supports fewer than three (3) pairs of burrowing owls, the onsite burrowing owls will be passively or actively relocated following accepted protocols.

2. Occupied nests shall be avoided during the nesting season (February 1 – August 31) and a buffer of 300 to 500 feet shall be employed, depending on the level of disturbance surrounding the burrow.

3. Burrow exclusion shall be utilized outside of the nesting season by installing a one-way door in burrow openings.

The burrow shall be closed following verification burrows are empty (through site monitoring and scoping).

4. If the site (including adjacent areas) supports three (3) or more pairs of burrowing owls, supports greater than 35 acres of suitable habitat, and is non-contiguous with MSHCP Conservation Area lands, at least 90 percent of the a
City of Corona
-Planning Division
Once within 30 days
prior to construction
activities in undisturbed
areas for each phase of
development
Within 30 days prior to
construction activities in
undisturbed areas for each
phase of development
Proof of burrowing owl survey. . Withhold grading
and/or building permits
Mitigation Measure BIO-MM13. Mountain Lion Program. Prior to issuance of the first Certificate of Occupancy for each phase of development, a mountain lion (Puma concolor) program shall be developed by the project Applicant for City review and approval in an effort to reduce likelihood of human-lion conflicts. The program shall include the following components:

1. A suitable homeowner education package for distribution to residents / new owners;

2. A suitable road sign program warning of the presence of mountain lions and the need for reduced speeds and increased caution;

3. A suitable CC&R provision limiting unsupervised outdoor pets and pet feeding practices that may encourage mountain lions to enter residential yards in search of food; and

4. A suitable mountain lion safety plan.

The Project’s CC&Rs shall include a provision specifically requiring future homeowners to comply with the requirements of the Mountain Lion Program.

City of Corona
-Planning Division
Once prior to issuance
of Certificate of
Occupancy for each
phase of development
Prior to issuance of Certificate
of Occupancy first production
unit.

Proof of program documents and
CC&Rs and placement of
information at model home
complex.

Withhold Certificates of
Occupancy
Mitigation Measure BIO-MM14. A qualified biologist shall monitor clearing and grubbing activities as they impact vegetation on the site. A qualified biologist shall inspect debris piles, pipes, burrows, vegetation, leaf litter piles, and other potential refugia for sensitive wildlife species prior to initiation of clearing, grubbing, grading, or any other project activity that may injure or kill sensitive wildlife species. If wildlife is discovered, the qualified biologist shall move it out of harm’s way or allow it to move safely out of the work area prior to initiation of project activities.

City of Corona
-Planning Division
At least once prior to
site clearing activities in
undisturbed areas for
each phase of
development
Prior to site clearing activities
in undisturbed areas for each
phase of development the
project applicant shall
demonstrate to the Planning
On-site inspection by project
biologist and report of findings
submitted to the Planning
Division.

Halt construction

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Potential day roosts for pallid bat (e.g., caves, crevices, mines, hollow trees, buildings, etc.) shall be inspected by a qualified bat biologist prior to initial ground disturbance. If bats are roosting, a bat exclusion plan shall be prepared and submitted to CDFW for review prior to impacts. If a colony is discovered during the breeding season (March-October), the biologist shall determine appropriate avoidance measures, including, but not limited to sound walls, buffers, and project phasing/timing, to prevent disturbance to the colony until all young are weaned and capable of foraging independently.

Division that a project
biologist has been retained
during initial on-site
disturbance activities.

Mitigation Measure BIO-MM15. Homeowner Education Package (Invasive Species). Prior to issuance of occupancy permits, the Project Applicant shall develop for review and approval by the City of Corona, a homeowner education package providing and informing future occupants that the list of plant species identified in Mitigation Measure BIO-5 are prohibited and may not be planted on any individual lot. The homeowner education package also shall include a list of recommended non-prohibited plant species. A copy of the City-approved homeowner education package shall be provided to future owners/tenants as part of all future lease/sales agreements.

City of Corona
-Planning Division
Once prior to issuance
of Certificate of
Occupancy
Prior to issuance of first
Certificate of Occupancy for
production units
Proof of design guidelines and
CC&Rs
Withhold Certificates of
Occupancy
Mitigation Measure BIO-MM16. All heavy equipment used onsite shall be washed, particularly the wheels and under carriage, prior to bringing it onto the project site from other construction sites to prevent the spread of weedy species.

City of Corona
-Planning Division
-Development Services Division
Once at plan check
(review of construction
bid documents); As
needed during
construction activities
for each phase of
development
Note on grading plans. Plan
check (review of construction
bid documents); At least once
during construction of each
phase of development
Review of construction bid
documents; on-site inspection.

Withhold grading
and/or building permit;
Halt construction
activities
Mitigation Measure BIO-MM17. Staging areas shall be placed in areas that have been previously disturbed or have degraded habitat within the project footprint but do not show an infestation of non-native species. Staging areas shall be maintained in a weed/noxious weed-free condition.

Withhold grading
and/or building permit;
Halt construction
activities
Mitigation Measure BIO-MM18. All refuse created or brought onsite by clearing personnel or contractors shall be placed in covered containers, removed from the site daily, and disposed of properly.

Withhold grading
and/or building permit;
Halt construction
activities
Mitigation Measure BIO-MM19. Field crews shall maintain the speed limit on posted roads and limit vehicle/truck speeds on unpaved surfaces to 15 miles per hour or less.

City of Corona
-Planning Division
-Development Services Division
Once at plan check
(review of construction
bid documents); As
needed during
construction
activities for each phase
of development
Note on grading plans. Plan
check (review of construction
bid documents); At least once
during
construction of each phase of
development
Review of construction bid
documents; on-site inspection.

Withhold grading
and/or building permit;
Halt construction
activities
Mitigation Measure BIO-MM20. Urban/Wildlands Interface. Prior to issuance of grading or building permits, the Applicant shall ensure that the grading and building plans have incorporated the measures to meet the requirements of the MSHCP Urban/Wildlands Interface guidelines and requirements (see MSHCP Volume I, Part 2 of 2, subsection 6.1.4) with respect to Drainage, Toxics, Lighting, Noise, Barriers, Access, Pets, and Grading/Land Development (See Section 9.5 of the BRA Report included in Appendix D to this Draft EIR).

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Mitigation Measure BIO-MM21. Crotch’s Bumble Bee. In the event the Crotch’s bumble bee (Bombus crotchii) status is listed as candidate, threatened or endangered by the CDFW at the time of construction, the following measures shall be implemented.
• Clearing/ground-disturbing activities shall be prohibited from February 1 through September 30 within suitable habitat for the Crotch’s bumble bee. As part of this requirement, if construction is proposed during this period, a qualified biologist shall go out and mark all of the suitable habitat on site, which must be avoided and fencing provided around any accessible areas until at least September 30. A letter report documenting the actions performed and completion of this measure shall be provided to the City of Corona prior to any disturbance of the Project site. Construction activities may commence in areas outside of suitable habitat for the bee. • For construction between October 1 and January 31, a pre-construction survey is required within suitable habitat to confirm that no nests occur on site. Should any nests be identified, the Project biologist shall consult with CDFW to determine if permits are required. Clearance within that portion of the property determined by the biologist to support a nest and a suitable buffer shall be avoided until consultation with the CDFW determines activities can resume or the site is no longer occupied. If the pre-construction survey identifies no nests, then construction activities may proceed as normal. A letter report documenting the actions performed and completion of this measure shall be provided to the City of Corona prior to any disturbance of the Project site. If consultation with the CDFW is required a second letter report shall be provided documenting the CDFW determination, requirements and approval prior to moving forward with construction activities on that portion of the Project site.
• Pesticides considered harmful to the Crotch bumble bee shall be prohibited during construction.

City of Corona
-Planning Division
Bee surveys are
required prior to
commencement of
grading activities if they
occur between February
1 and September 30
within suitable habitat,
and pre-construction
surveys are required for
construction activities
that would commence
between October 1 and
January 31 within
suitable habitat
Prior to issuance of grading
permits and prior to the
commencement of
clearing/ground-disturbing
activities
Submittal of bee survey, letter
and other documentation as
applicable to the City for review
Withhold grading
permit or withhold
Certificate of
Occupancy
Mitigation Measure BIO-MM22 Workers Environmental Awareness Program. All persons employed or otherwise working on the Project site during the vegetation clearing and grading phase of construction shall attend a Workers Environmental Awareness Program (WEAP) training. All workers must attend WEAP training prior to performing any work on-site. The WEAP shall consist of a presentation (either provided in person by the biological monitor or a recorded training session) that includes a discussion of the biology of the habitats and species that may be present at the site. The WEAP shall also include information about the special-status plant and wildlife species that may be present, legal protections for those species, penalties for violations, and mitigation measures. The WEAP shall include but not be limited to burrowing owl, nesting birds, and other special-status species. The WEAP shall also include information on weed control practices, appropriate trash disposal, fire prevention and procedures for smoking, spill prevention and procedures, jurisdictional waters and SWPPP, BMPs, biological monitors and compliance responsibilities, and other issues such as pets, firearms, etc.

Attendance at training shall be documented and construction workers provided with a hardhat sticker. Supporting materials shall be provided to all personnel during the training program, including contact information for the biological monitor and/or other compliance personnel. Informal or formal refresher training shall be conducted as needed to maintain compliance.

City of Corona
-Planning Division
Notes to be included on
grading and building
plans
Prior to commencement of
construction work on site for
all construction employees
Submittal of proof WEAP
attendance to the City for review
Withhold grading
permit or withhold
Certificate of
Occupancy
Mitigation Measure BIO-MM23 Restoration. Prior to final grading inspection, temporary impact areas associated with the haul road required during site mass grading activities shall be restored to its former condition.

City of Corona
-Planning Division
- Development Services Division
-Public Works Department
Once prior to issuance
of occupancy permits
Following completion of
grading and prior to final
grading inspection
Site visit and submittal of written
confirmation from the developer
Withhold Certificate of
Occupancy
Mitigation Measure BIO-MM24 Invasive Species Restrictions and CC&Rs. Prior to issuance of occupancy permits, the Project Applicant shall provide the City of Corona with a copy of the Project’s Codes, Covenants, and Restrictions (CC&Rs).

The Project CC&Rs shall explicitly prohibit the planting of the non-native plant species identified by Mitigation Measure BIO-5.

City of Corona
-Planning Division
- Development Services Division
-Public Works Department
Notes to be included on
grading and building
plans
Prior to issuance of
occupancy permits
Copy of CC&Rs to be provided to
the City
Withhold grading
permit or withhold
Certificate of
Occupancy
PDF BIO-1, Drainage – The project incorporates project streets, open channels and natural drainage courses as well as a comprehensive system of underground storm drains to handle storm runoff from the project site. Storm water from the project site and off-site areas will be directed to storm drains. The design and operation of the drainage channel shall be adequate to preclude discharge of water into open space areas that are of lower quality or higher quality than current conditions. The proposed development shall incorporate measures, including measures required through the NPDES requirements, to ensure that the quantity and quality of runoff discharged to the open space area is not altered in an adverse way when compared with existing conditions. In particular, measures shall be put in place to avoid discharge of untreated surface runoff from developed and paved areas into open space areas. Stormwater systems shall be designed to prevent the release of toxins, chemicals, petroleum products, exotic plant materials, or other elements that might degrade or harm biological resources or ecosystem processes within open space areas. This will be accomplished using a variety of methods including natural detention basins, grass swales, or mechanical trapping devices. Regular maintenance shall occur to ensure effective operations of runoff control systems.

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Certificate of Occupancy
for each phase of
development
PDF BIO-2, Toxics – The proposed project is designed to utilize natural drainage patterns for the flow of surface water.

Water Quality Best Management Practices (BMPs) include education, storm drain stenciling, and street sweeping in compliance with the City of Corona’s requirements. The earthen channel shall be signed to filter potential toxics in the storm water prior to its discharge into open space areas. These BMPs will be implemented as part of the storm water pollution prevention measures for the project, in accordance with all appropriate NPDES requirements. The project would result in the additional use of hazardous materials in limited quantities associated with normal residential use such as cleaning products, solvents, herbicides, and insecticides. However, compliance with regulations will reduce the potential risk of hazardous material exposure to a level that is less than significant. An information pamphlet has been prepared for each homeowner regarding the use of toxics.

City of Corona
-Planning Division
-Public Works Department
-Development Services Division
Once during plan check
(project design- related
measures); once prior
to issuance of grading
permit for each phase
of development or as
necessary during
construction
(construction
measures); Once prior
to issuance of
Certificate of Occupancy
for each phase of
development
Plan check (project designrelated measures); Prior to
issuance of grading permit for
each phase of development
(construction measures);
Prior to issuance of Certificate
of Occupancy
for each phase of
development
Review of Project plans,
construction documents, and onsite inspection
Withhold grading or
building permit; halt
construction; withhold
Certificate of
Occupancy
PDF BIO-3, Lighting – Outdoor lighting of residences will be designed so that all direct beams would be confined to dwelling sites. Project lighting will not intrude into the open space conservation areas. Street lighting, parking lot lighting, and other project-related illumination sources will be positioned, directed, and shielded so as to avoid “light spill” into the conserved areas. The proposed project will avoid any night lighting adjacent to the open space areas. Night lighting will not be used during the course of construction unless absolutely necessary. If necessary, the lights will be directed and shielded to minimize lighting of the surrounding habitat. The level of off-site lighting and lighting fixtures would comply with the applicable requirements and policies of the City of Corona.

City of Corona
-Planning Division
Once during plan check
(project design- related
measures); once prior
to issuance of grading
permit for each phase
of development or as
necessary during
construction
(construction
measures); Once prior
to issuance of
Certificate of Occupancy
for each phase of
development
Plan check (project designrelated measures); Prior to
issuance of grading permit for
each phase of development
(construction measures);
Prior to issuance of Certificate
of Occupancy for each phase
of development
Review of Project plans,
construction documents, and onsite inspection
Withhold grading or
building permit; halt
construction; withhold
Certificate of
Occupancy
PDF BIO-4, Noise – The proposed project incorporates landscape elements including trees, shrubs, and groundcover, which will assist in noise reduction on the project site. In addition, a noise analysis prepared for the project found that no proposed on-site or surrounding sensitive land uses would experience long-term noise levels in excess of 65 dBA during the daytime hours under build-out of the proposed project. This daytime noise level would not result in exterior nighttime levels greater than 45 dBA. Therefore, no noise created on the project site would exceed residential noise standards.

City of Corona
-Planning Division
Once during plan check
(project design- related
measures); Once prior
to issuance of
Certificate of Occupancy
for each phase of
development
Plan check (project designrelated measures); Prior to
issuance of Certificate of
Occupancy for each phase of
development
Review of Project plans; On-site
inspection
Withhold grading,
building, or landscape
permit; Withhold
Certificate of
Occupancy
PDF BIO-5, Invasives – Exotic Vegetation Control – Design guidelines for the project will provide the homeowners with a list of native landscaping materials permitted within the project site. These materials have been selected for their contribution to the project theme, adaptability to local climatic and soil conditions, and for their compatibility with the unique natural environment in the project site. The MSHCP has identified exotic invasive plants that should be areas avoided adjacent to the MSHCP Conservation Area in Table 6-2, Section 6.1.4 of the MSHCP; none of these plants will be utilized for the proposed project and their use by future homeowners will be prohibited.

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Sanctions for NonCompliance
PDF BIO-6, Barriers – The proposed project will include theme walls along project perimeter streets adjacent to public streets, and will include walls and fencing located where public view and/or important interfaces are of concern. The proposed project will incorporate special edge treatments designed to separate development areas from open space areas. These areas of native landscaping and fencing will serve to minimize unauthorized public access, domestic animals predation, and illegal trespass and dumping. Exclusion fencing will be permanently placed where development abuts avoided and adjacent open space areas. The exclusion fence will be a minimum of eight feet in height and will be installed and maintained for the purposed of controlling human and pet access (cats and dogs) into the open space area and be in compliance with MSHCP requirements. The fencing will be permanent and will be maintained in perpetuity.

Approval of the fencing design will be required by the City of Corona prior to project initiation.

City of Corona
-Planning Division
Once during plan check
(project design- related
measures); once prior
to issuance of grading
permit for each phase
of development or as
necessary during
construction
(constructio n
measures); Once prior
to issuance of
Certificate of Occupancy
for each phase of
development
Plan check (project designrelated measures); Prior to
issuance of grading permit for
each phase of development
(construction measures);
Prior to issuance of Certificate
of Occupancy for each phase
of development
Review of Project plans,
construction documents, and onsite inspection
Withhold grading or
building permit; halt
construction; withhold
Certificate of
Occupancy
PDF BIO-7, Access – Access points between native habitats and the project development will be posted with signage requesting residents to stay on the trails and not to disturb habitat. Yard fencing with no back gate will reduce access to native habitats adjacent to the project.

City of Corona
-Planning Division
Once during plan check
(project design- related
measures); Once prior
to issuance of
Certificate of Occupancy
for each phase of
development
Plan check (project designrelated measures); Prior to
issuance of Certificate of
Occupancy for each phase of
development
Review of Project plans; On-site
inspection
Withhold grading or
building permit;
Withhold Certificate of
Occupancy
PDF BIO-8, Pets – Uncontrolled pets, feral dogs and cats can predate on native wildlife species. Appropriate signage will be posted requesting residents leash their pets. Homeowner Educational pamphlets will be used to inform them of the potential impacts by uncontrolled pets on native habitats and to request residents be good stewards of the land and prevent or limit their domestic cats from being allowed to openly hunt in the avoidance area.

City of Corona
-Planning Division
Once prior to issuance
of Certificate of
Occupancy for each
phase of development
Prior to issuance of Certificate
of Occupancy for each phase
of development
On-site inspection Withhold Certificate of
Occupancy
PDF BIO-9, Grading/Land Development – All manufactured slopes associated with site development will be within the project site and there will be no impact to the MSHCP Conservation Area. All manufactured slopes that abut the natural open space will be retained as open space buffer zones. All manufactured slopes and areas disturbed by construction of these slopes will be revegetated with appropriate non-invasive buffer species during project construction.

City of Corona
-Planning Division
-Building Division
Once during plan check
(project design- related
measures); once prior
to issuance of grading
permit for each phase
of development or as
necessary during
construction
(construction
measures);
Once prior to issuance
of Certificate of
Occupancy for each
phase of development
Plan check (project designrelated measures); Prior to
issuance of grading permit for
each phase of development
(construction measures);
Prior to issuance of Certificate
of Occupancy for each phase
of development
Review of Project grading plans;
on-site inspection
Withhold grading or
building permit;
withhold Certificate of
Occupancy

CULTURAL RESOURCES
Mitigation Measure CR-1: Tribal Monitoring. Prior to the issuance of a grading permit the applicant shall contact the consulting Native American Tribe(s) that have requested monitoring through consultation with the City during the SB 18 process ("Monitoring Tribes”). The applicant shall coordinate with the Tribe(s) to develop individual Tribal Monitoring Agreement(s). A copy of the signed agreement(s) shall be provided to the City of Corona Planning Department prior to the issuance of a grading permit. The Agreement shall address the treatment of any known tribal cultural resources (TCRs) including the project's approved mitigation measures and conditions of approval; the designation, responsibilities, and participation of professional Tribal Monitors during grading, excavation and ground disturbing activities; project grading and development scheduling: terms of compensation for the monitors; and treatment and final disposition of any cultural resources, sacred sites, and human remains/burial goods discovered on the site per the Tribe(s) customs and traditions and the City’s mitigation measures/conditions of approval. The Tribal Monitor will have the authority to stop and redirect grading in the immediate area of a find in order to evaluate the find and determine the appropriate next steps, in consultation with the Project archaeologist.

If changes are made to the project footprint to include earth-moving activities in areas not previously studied, additional archaeological investigations shall be required.

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Mitigation Measure CR-2: Archaeological Monitoring. At least 30-days prior to application for a grading permit and before any grading, excavation and/or ground disturbing activities on the site take place, the Project Applicant shall retain a Secretary of Interior Standards qualified and RPA-certified archaeological monitor to monitor all ground-disturbing activities in an effort to identify any unknown archaeological resources/TCRs and assist with avoidance, preservation and/or mitigation per the City's Mitigation Measures on known resources.

The Project Archaeologist in consultation with the Monitoring Tribe(s), the Developer and the City, shall develop a Cultural Resources Monitoring Plan (CRMP) to address the details, timing and responsibility of all archaeological and cultural activities that will occur on the project site. Details in the Plan shall include:
a. Project grading and development scheduling;
b. The Project archeologist and the Monitoring Tribe(s) shall attend the pre-grading meeting with the construction manager and any contractors and will conduct a mandatory Cultural Resources Worker Sensitivity Training to those in attendance. The Training will include a brief review of the cultural sensitivity of the Project and the surrounding area: what resources could potentially be identified during earthmoving activities; the requirements of the monitoring program: the protocols that apply in the event inadvertent discoveries of cultural resources are identified, including who to contact and appropriate avoidance measures until the find(s) can be properly evaluated; and any other appropriate protocols. All new construction personnel that begin work on the Project following the initial Training must take the Cultural Sensitivity Training prior to beginning work and the Project archaeologist and Monitoring Tribe(s) shall make themselves available to provide the training on an as-needed basis.
c. The coordination of a monitoring schedule as agreed upon by the Monitoring Tribe(s), the Project archaeologist and the applicant;
d. The protocols and stipulations that the Developer. City, Monitoring Tribe(s) and Project archaeologist will follow in the event of inadvertent cultural resources discoveries, including any newly discovered cultural resource deposits that shall be subject to a cultural resources evaluation.

City of Corona
-Planning Division
At least once within 30
days prior to Issuance of
grading permit for each
phase of development
At least 30 days prior to
Issuance of grading permit for
each phase of development
Proof of retention/ contract and
submittal of CRMP to the City.

CRMP shall be approved by the
City and consulting tribal groups.

Withhold grading
permit
Mitigation Measure CR-3: Treatment and Disposition of Tribal Cultural Resources. In the event that Tribal Cultural Resources (TCRs) are inadvertently discovered during the course of grading for this Project and avoidance of the TCRs is not feasible, the following procedures will be carried out for treatment and disposition of the discoveries:

1. Temporary Curation and Storage: During the course of construction. All discovered resources shall be temporarily curated in a secure location onsite or at the offices of the project archaeologist. The removal of any artifacts from the project site will need to be thoroughly inventoried with tribal monitor oversight of the process; and

2. Treatment and Final Disposition: The landowner(s) shall relinquish ownership of all cultural resources, including all archaeological artifacts and non-human remains as part of the required mitigation for impacts to tribal cultural resources. Human remains, sacred/ceremonial items and burial good will be addressed per State Law.

Mitigation Measure CR-1 and the Agreement required in Mitigation Measure CR-1. The applicant shall relinquish the artifacts as indicated below and provide the City of Corona Planning Division with evidence of same:
a. Professional curation, including a curation agreement with a qualified repository in Riverside County that meets federal standards per 36 CFR Part 79, and which shall be made available to all qualified researchers upon application. The collections and associated records shall be transferred, including title, to an appropriate curation facility within Riverside County, to be accompanied by payment of the fees necessary for permanent curation;
b. At the completion of grading, excavation and ground disturbing activities on the site, a Phase IV Monitoring Report shall be submitted to the City Planning Division documenting monitoring activities conducted by the project Archaeologist and Native Tribal Monitors within 60 days of completion of grading. This report shall document the impacts to the known resources on the property; describe how each mitigation measure was fulfilled; document the type of cultural resources recovered and the disposition of such resources; provide evidence of the required cultural sensitivity training for the construction staff held during the required pregrade meeting; and, in a confidential appendix, include the daily/weekly monitoring notes from the archaeologist. All reports produced will be submitted to the City of Corona, Eastern Information Center and Monitoring Tribe(s).

City of Corona
-Planning Division
As necessary during
grading and
construction activities
for each phase of
development
As necessary during grading
and construction activities for
each phase of development
Submittal of curation agreement,
Phase IV Monitoring Report and
other written documentation as
necessary to the City for review
Withhold grading or
building permit/ halt
construction
Mitigation Measure CR-4: Sacred Sites. All sacred sites, should they be encountered within the project area, shall be avoided and preserved as the preferred mitigation, if feasible.

City of Corona
-Planning Division
As necessary during
grading and
construction activities
As necessary during grading
and construction activities for
each phase of development
Proof of Monitoring Report(s) Withhold grading or
building permit/ halt
construction

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Sanctions for NonCompliance
for each phase of
development
Mitigation Measure CR-5: Discovery of Human Remains. In the event that human remains (or remains that may be human) are discovered at the project site during grading or earthmoving. the construction contractors, project archaeologist, and/or designated Native American Monitor shall immediately stop all activities within 100 feet of the find.

The project applicant shall then inform the Riverside County Coroner and the City of Corona Planning Division immediately, and the coroner shall be permitted to examine the remains as required by California Health and Safety Code Section 7050.5(b). Section 7050.5 requires that excavation be stopped in the vicinity of discovered human remains until the coroner has made the necessary findings as to origin If human remains are determined to be Native American,, the applicant shall comply with the state law relating to the disposition of Native American burials that fall within the jurisdiction of the NARC (PRC Section 5097). The coroner shall contact the NAHC within 24 hours and the NAHC will make the determination of most likely descendant(s). The MLD shall complete his or her inspection and make recommendations or preferences for treatment within 48 hours of being granted access to the site. Treatment and disposition of the remains shall be determined in consultation with the most likely descendant(s) to determine the most appropriate disposition of human remains and any associated grave artifacts. In the event that the applicant and the MLD are in disagreement regarding the disposition of the remains. State law will apply and the mediation process will occur with the NAHC. if requested (see PRC Section 5097.98(e) and 5097.94(k)).

The specific locations of Native American burials and reburials are confidential and may not be disclosed to the general public. The locations will be documented by the consulting archaeologist in conjunction with the various stakeholders and a report of findings will be filed with the Eastern Information Center (EIC). A Sacred Lands File form will be submitted to the NAHC by the project archaeologist and the Monitoring Tribe(s).

According to the California Health and Safety Code, six or more human burials at one location constitutes a cemetery (Section 8100), and disturbance of Native American cemeteries is a felony (Section 7052).

City of Corona
-Planning Division
-Public Works Div.

As necessary during
grading and
construction activities
for each phase of
development
As necessary during grading
and construction activities for
each phase of development
Proof of Monitoring Report(s) Withhold grading or
building permit/ halt
construction
Mitigation Measure CR-6: Prior to issuance of any grading permit, the Applicant shall retain a qualified vertebrate paleontologist to develop a paleontological resource impact mitigation program (PRIMP) for excavations into the Upper Cretaceous Ladd Canyon Formation, the Upper Cretaceous Williams and Ladd Formations (undifferentiated), the Early Pleistocene Very Old Alluvial Fan Deposits; the Upper Cretaceous Ladd Formation/Baker Canyon Conglomerate member; and Paleocene Silverado Formation. A qualified vertebrate paleontologist is defined as a paleontologist meeting the criteria established by the Society for Vertebrate Paleontology. The qualified vertebrate paleontologist shall conduct a preconstruction field assessment to locate fossils at surface exposures. The qualified vertebrate paleontologist shall supervise a paleontological monitor who shall be present at such times as required by the paleontologist during construction excavations into the fossiliferous formations mentioned above. Monitoring shall consist of visually inspecting fresh exposures of rock for larger fossil remains and, where appropriate, collecting wet or dry screened sediment samples of promising horizons for smaller fossil remains. The frequency of monitoring shall be determined by the paleontologist and shall be based on the rate of excavation and grading activities, the materials being excavated, and the depth of excavation, and if found, the abundance and type of fossils encountered. If resources are located, monitoring hours shall be increased as needed.

City of Corona
-Planning Division
At least once prior to
Issuance of grading
permit for each phase
of development
Prior to Issuance of grading
permit for each phase of
development
Proof of PRIMP Withhold grading
permit
Mitigation Measure CR-7: If a potential fossil is found, the qualified vertebrate paleontologist or paleontological monitor shall be allowed to temporarily divert or redirect grading and excavation activities in the area of the exposed fossil, as determined appropriate by the monitor, to assess the significance of the find and, if necessary, develop appropriate treatment measures. Treatment measures may include avoidance or preservation in place, if feasible. If preservation or avoidance of the resource is not feasible, then the resource shall be removed from its location. Removal activities may consist of the relatively rapid removal of small isolated fossils from an active cut, to hand-quarrying of larger fossils over several hours, to excavations of large fossils or large numbers of smaller fossils from a bone bed over several days. These activities may include the assistance of the grading and excavation contractor’s equipment to facilitate removal. Any fossils encountered and recovered shall be prepared to the point of identification and catalogued before they are donated to their final repository. Any fossils collected shall be donated to a public, non-profit institution with a research interest in the materials, such as the Natural History Museum of Los Angeles County, San Bernardino County Museum, the John D.

Cooper Archaeological and Paleontological Curation Center at the California State University, Fullerton, or Western Science Center in Hemet, California. Accompanying notes, maps, and photographs shall also be filed at the repository.

City of Corona
-Planning Division
-Development Services Division
-Public Works Department
As necessary during
grading and
construction activities
for each phase of
development
As necessary during grading
and construction activities for
each phase of development
Proof of Monitoring Report(s) or
on-site inspection
Halt Construction
Mitigation Measure CR-8: Prior to the release of the grading bond, the paleontologist shall prepare a report summarizing the results of the monitoring and salvaging efforts, the methodology used in these efforts, as well as a description of the fossils collected and their significance. The report shall be submitted by the Applicant to the Planning Director or his/her designee for approval. In addition, the report shall be submitted to at least one of the repositories mentioned in Mitigation City of Corona
-Planning Division
-Development Services Division
As necessary during
grading and
construction activities
Prior to release of grading
bonds
Proof of Monitoring and Salvage
Report(s) or on-site inspection
Withhold release of
grading bonds

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Measure CR-7 and other appropriate or concerned agencies to signify the satisfactory completion of the project and required mitigation measures.
for each phase of
development

GEOLOGY AND SOILS
Mitigation Measure GEO-1: Site Preparation and Removals. All grading shall be accomplished under the observation and testing of the Project Geotechnical Engineer and Engineering Geologist in accordance with the recommendations contained in the Project Geotechnical Report, contained in Appendix F of this Draft EIR), the current codes practiced by the City of Corona and the Earthwork Specifications contained in Appendix IV of the Project Geotechnical Report.

Loose, compressible residual soil, non-engineered onsite fill, colluvium, alluvium, landslide debris, older alluvium and weathered bedrock shall be removed from fill areas prior to placement of fill and shall be removed from shallow cut areas, where exposed at finish grades.

Guidelines to determine the depth of removals are presented below; however, the exact extent of the removals must be determined in the field during grading, when observation and evaluation of the greater detail afforded by those exposures can be performed by the Geotechnical engineer and/or Engineering Geologist.

The minimum backcut ratio shall be 1:1 (horizontal to vertical). The bottoms of all removal areas shall be observed, mapped and approved by the Engineering Geologist prior to fill placement. It is recommended that the bottoms of removals be surveyed and documented by the Project Civil Engineer.

Groundwater, if encountered during grading, shall be evaluated by the Geotechnical Engineer and/or Engineering Geologist. In general, groundwater is not anticipated to adversely affect grading although saturated soils and free water may be encountered along canyons and within alluvium removals. If groundwater is excessive, remedial measures such as horizontal drains or under drains may need to be installed. Further, settlement monuments and plates (see Plate VI of the Geotechnical Report) shall be installed during and after completion of grading to monitor settlement monuments and plates shall be used to determine when the majority of the primary settlement has been completed to allow for the release of affected lots for construction.
• Stripping: Vegetation, debris and other deleterious materials are unsuitable as structural fill material and shall be disposed of offsite prior to commencing removals and placement of compacted fills. The thick, natural vegetative growth onsite is significant and will require consideration for removal. An onsite mulching operation may be considered. The mulched materials could then be used in future landscape areas. • Soil and Weathered Bedrock (unmapped): Loose, compressible onsite soils and underlying weathered bedrock shall be removed to expose the underlying competent bedrock materials prior to placement of compacted fill and when exposed in shallow cut area. An average removal depth of 5 feet is anticipated for removal of topsoil and weathered bedrock. In general, onsite soils and weathered bedrock are suitable to be re-used as structural fill when properly moisture-conditioned.
• Undocumented Artificial Fill (locally mapped as AFu): Fills associated with "recreational" grading, construction of unpaved access roads, mining operations and existing trench backfill shall be removed prior to fill placement.

Generally, these artificial fills range from a depth of 3 to 20 feet. Local areas of undocumented fill associated with previous geotechnical investigations are not plotted on the map. Other fills, including roadway fills and trench backfill, are not mapped due to their localized extent and minor thickness. Removals shall extend below the undocumented fill until competent materials are encountered. • Alluvium/Colluvium (map symbol Qal): All alluvium deposits exposed at existing or cut grades shall be entirely removed prior to fill placement. These deposits range in thickness from approximately 5 feet to 35 feet. Ginter and Associates recommends that all alluvial and colluvial soils below proposed fill areas and in cut areas be removed to expose competent bedrock or terrace deposits. Anticipated average removal depths for alluvium/colluvium areas are expected to vary to an estimated maximum thickness of 35 feet.

Groundwater was not encountered during PSE's subsurface investigation within the alluvium onsite. However, access was limited and certain alluvial areas could not be investigated such as within Krooner Canyon. If "saturated" alluvium is encountered that possesses a degree of saturation of 85% of more and is consistent with depth to bedrock, consideration may be given to leaving the saturated alluvium in-place, provided that settlement time-delay consequences are acceptable to the owner. If saturated alluvium is encountered and is going to remain in-place, an additional liquefaction investigation may be required and dynamic settlement recommendations for those areas will likely change. • Older Alluvium (Qoa): All older alluvium shall be removed to expose the underlying competent bedrock.

Generally, these deposits range in depth from 10 to about 20 feet.

City of Corona
-Development Services Division
Once during plan check;
As needed during site
grading
Plan check; As needed during
grading activities
Review of engineering reports/
plans; On-site inspection
Withhold grading or
building permit; Halt
grading and
construction activities

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Sanctions for NonCompliance
• Landslide Debris (Qls): All landslide debris that could adversely affect the proposed development shall be removed to expose the underlying competent bedrock. Generally, these deposits range in depth from 10 to about 29 feet, but may range up to around 35 feet in depth. • Removals Along Grading Limits: Removals of unsuitable soils shall be required prior to fill placement along the grading limit. A 1:1 projection, from toe of slope or grading limit, outward to competent materials shall be established, when possible. Where removals are not possible due to grading limits, property line or easement restrictions, removals shall be initiated at the grading boundary (property line easement, grading limit or outside the improvement) at a 1:1 ratio inward to competent materials. Where this reduced removal criterion is implemented, special maintenance zones may be necessary. Affected areas shall be established, minimally, as a 1:1 projection from suitable removal bottom to finish ground surface. This condition is mainly expected in the slope areas. Where the projection intersects the face of the slope, the potential for distortion of the slope in response to post-grading settlements exists and provisions for future maintenance of such slopes shall be provided.

Mitigation Measure GEO-2: Slope Stability and Remediation • Cut Slopes: The majority of cut slopes have been designed at a slope ratio of 2:1. The Engineering Geologist shall observe cut slopes and cut slope stabilization backcuts during grading. Modifications to the recommendations presented herein will likely be required based upon conditions exposed by grading. • Williams Formation (KW): Cut slopes within the Williams Formation may expose adverse bedding that shall require remediation. The cut slope superjacent to Lots 278 and 279 is anticipated to require replacement with a buttress fill. Probable buttresses are anticipated for the cut slope above Lots 261 through 267 and the cut slope below the WQMP Basin and Lots 247 through 255, as depicted on Figure 1 and Figure 2 (pocket) of the Geotechnical Report.
• Ladd Formation: Cut slopes within the Ladd Formation may expose adverse bedding that shall require remediation. The majority of the cut slopes should expose bedding dipping into the slope or at an angle steeper than the proposed cut slopes (greater than 60 degrees). Cut slopes within the Ladd Formation that expose bedding dipping into the slope or at an angle steeper than the proposed cut slopes are expected to be grossly stable; however, the final determination shall be made based on exposed conditions during grading. Cut slopes within the Ladd Formation may expose conglomerate resulting in poorly cemented sands, cobbles and boulders at finish grade, producing a rough uneven surface. These cut slopes shall be evaluated in the field by the Project Engineering Geologist or Geotechnical Engineer. Replacement of those slopes with compacted stabilization fills may be required. Future exploration and in-grading observation could reveal more favorable geology in these specific areas shall be 2 feet. Due to grading limit restrictions, removals of unsuitable soils beyond the proposed toe may be limited; therefore, additional slope maintenance shall be expected in the areas where a 1:1 projection into approved materials cannot be achieved.
• Alluvium/Colluvium: Cut slopes exposing alluvial/colluvial soils (Qal) shall require replacement with a drained stabilization fill. Typically, such corrective grading would be constructed with a minimum key width corresponding to one-half the full height of the superjacent slope, but not less than 15 feet. Minimum key depths at the toe shall be 2 feet. All stabilization fills shall be provided with a backdrain and outlet system as detailed in Appendix IV of the Geotechnical Report.
• Silverado Formation: Cut slopes within the Silverado Formation are expected to be grossly stable; however the final determination shall be made based on exposed conditions during grading. Cut slopes within the Silverado Formation may expose poorly cemented sands, cobbles and boulders at finish grade, which would produce a rough uneven surface. These cut slopes shall be evaluated in the field by the Project Engineering Geologist or Geotechnical Engineer. Replacement of those slopes with compacted stabilization fills may be required. • Fill Slopes: The majority of fill slopes on the project are designed at a maximum slope ratio of 2:1. The highest fill slope is approximately 160 feet in height and located subjacent to Lot 68. Based on the results of the calculations, the 2:1 fill slopes 160 feet and less in height, when properly constructed with onsite materials, are expected to be grossly stable, as designed. Keys shall be constructed at the toe of all fill slopes where unsuitable soil removals do not accomplish a minimum key width of one-half the slope height plus bench widths or twenty (20) feet, whichever is greater. Minimum key depths at the toe shall be 2 feet. Due to grading limit restrictions, removals of unsuitable soils beyond the proposed toe may be limited; therefore, additional slope maintenance shall be expected in the areas where a 1:1 projection into approved materials cannot be achieved.

City of Corona
-Development Services Division
Once during plan check;
As needed during site
grading
Plan check; As needed during
grading activities
Review of engineering
reports/plans
; On-site inspection
Withhold grading or
building permit; Halt
grading and
construction activities

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Sanctions for NonCompliance
Mitigation Measure GEO-3: Subsurface Drainage. Canyon subdrains are proposed as depicted on Figures 1 through 7 of the Geotechnical Report and shall consist of 6-inch and 8-inch diameter pipes and shall be constructed in accordance with the details shown in Appendix IV of the Geotechnical Report. Final determination of drain locations shall be made in the field. Outletting of subdrain systems shall require coordination with the Project Civil Engineer in determining suitable facilities to accept to drain water.

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-4: Overexcavation. Where a transition of cut and fill occurs across a finished lot, it shall be necessary to overexcavate the bedrock portions and replace it with compacted fill. The depth of bedrock overecavation shall be equal to 1/3 the maximum fill depth (after removals) on the fill side of the transition. Anticipated transition lots are shown on figures 1-7 of the geotechnical report. Cut pads shall be overexcavated a minimum of 5 feet to provide a uniform foundation material. Some highly expansive soils of the silverado formation may be encountered at grade in some areas.

Consideration shall be given to increasing the overexcavation depth to mitigate for highly expansive soils, if warranted.

Difficult excavation with a backhoe can be expected in some street areas. Ginter & associates recommends street overexcavation and replacement with compacted fill to facilitate utility emplacement in these street areas and driveways.

Depths of overexcavation shall extend one (1) foot below the deepest utility line.

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-5: Fill Materials. Excavated on-site soils may be used as compacted fill. The fill materials to be used as compacted engineered fill shall be free of organics, debris, deleterious materials, and rocks over 6 inches maximum dimension, and must be approved by the project geotechnical engineer or project geologist prior to use. Import soils, if required, shall be evaluated by the project geotechnical engineer for suitability prior to delivery. Import soils shall be free of trash, debris or other objectionable materials. All import fill shall have engineering characteristics similar to the on-site soils.

City of Corona
-Development Services Division
Once during plan check;
As needed during site
grading and
construction
Plan check; As 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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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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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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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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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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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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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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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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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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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

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MITIGATION MONITORING AND REPORTING PROGRAM
(SEE ATTACHED 24 PAGES)

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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
the removal of nonnative plant species, trash, and debris, and the installation of native plant materials. Prior to any ground disturbance, the Applicant shall prepare a Chaparral Nolina Planting Plan (Plan) for chaparral nolina.

1. a description of the existing conditions of the receiver site(s) characterizing the suitability of the site(s) for chaparral nolina, and documenting the acreage of the site,

4. receiver site preparation for transplanting,

5. goals for success,

6. schedule,

7. propagation techniques,

8. transplant and seedling installation methods,

9. plant spacing,

10. performance criteria for success, including provision for control of non-native and invasive species,

11. monitoring and reporting procedures for each of the five years of the monitoring period,

12. adaptive management strategies, including a contingency plan should the site fail to meet the specified success criteria, and

13. maintenance requirements that will be reviewed and approved by the City. The Plan shall also ensure a mixture of both male and female plants.

2. Conserved via recordation of a conservation easement or deed restriction in favor of a CDFW-due diligence approved local conservation entity.

City of Corona
-Planning Division
Once prior to site
clearing or grading
activities for each phase
of development
Prior to issuance of grading
permit, site clearing or
grading activities for each
phase of development
Proof of conservation easement
or deed restriction; On-site
inspection
Withhold grading
permit
Mitigation Measure BIO-MM4. Designate Unimpacted Areas as Open Space. Prior to recordation of Final Maps for each phase of the proposed development, those areas of the project site not impacted by the project footprint, including Riparian/Riverine and excluding the minimum 10-acre preservation area identified in BIO-MM3, shall be conserved in perpetuity via the recordation of a conservation easement or deed restriction in favor of a CDFW-approved local conservation entity; or transferred in fee title to a CDFW-approved local conservation entity. The avoided Riparian/Riverine areas shall be conserved prior to issuance of a grading permit. The CDFW-approved local conservation entity shall manage the conservation areas to protect the long-term conservation, functions and values in-perpetuity.

Review of CC&Rs; On- site
inspection
Withhold building
permit

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Sanctions for NonCompliance
shall also develop and distribute a suitable homeowner education package to residents / new owners covering the species to avoid
Mitigation Measure BIO-MM6. Oak Tree Replacement. The project Applicant shall replace oak trees impacted by the project at a ratio consistent with the City of Corona oak tree conservancy policy (10.10.5), at no less than a 2:1 ratio.

City of Corona
-Planning Division
Once prior to issuance
of grading permit for
each phase of
development
Prior to issuance of grading
permit for each phase of
development
Proof of Agreements and
regulatory permits
Withhold grading
permit
Mitigation Measure BIO-MM10. California Department of Fish and Wildlife Permit. Prior to the issuance of a grading permit, to mitigate for the loss of ±10.51 acres of streambed and wetlands and the temporary loss of ±1.13 acres of streambed due to project construction, the project Applicant shall enter into an agreement with the California Department City of Corona
-Planning Division
Once prior to issuance
of grading permit for
Prior to issuance of grading
permit for each phase of
development
Review of Agreements/ permits Withhold grading
permit

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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
of Fish and Wildlife (CDFW) via issuance and implementation of a Section 1600 Streambed Alteration Agreement to replace affected streambed at not less than a 2:1 basis (mitigation:impact) for permanent impacts and restoration of temporarily impacted areas to their existing/former condition, as specified by the California Department of Fish and Wildlife, through a combination of offsite acquisition and preservation, participation in an approved mitigation bank, and/or on or offsite creation, enhancement, or reestablishment of the streambed. The exact ratio shall be based on a functions and values assessment pursuant to CDFW’s approval of the required Streambed Alteration Agreement. Preparation of a Habitat Mitigation and Monitoring Plan (HMMP) outlining the details of the mitigation shall be required for on-site mitigation or off-site mitigation on lands not already subject to a CDFW-approved HMMP. each phase of
development
Mitigation Measure BIO-MM11. Nesting Birds. To prevent impacts to sensitive, migratory, and nesting birds (including raptors), clearing, or other work in native habitats shall be avoided during the critical nesting period of January 1 – September 1. If work cannot be avoided during this timeframe, a nesting bird survey shall be conducted by a qualified biologist within three (3) days prior to initiation of clearing and/or grading. A letter report documenting the clearance survey and its results shall be provided to the City of Corona prior to any disturbance to the Project site. If nesting birds are present, a nesting bird plan shall be developed and implemented to include appropriate measures to mitigate potential impacts, including maintaining a buffer area until fledging has occurred. Active bird nests shall be mapped utilizing a handheld global positioning system (GPS) (getting as close as possible without disturbing the nest) and a buffer will be flagged around the nest (typically 300 feet for most species, 500-foot buffer for raptor nests), as determined appropriate by the biologist. Construction should not be permitted within the buffer area while the nest continues to be active (eggs, chicks, etc.). Once fledging has occurred no further avoidance is required.

3. Burrow exclusion shall be utilized outside of the nesting season by installing a one-way door in burrow openings.

The burrow shall be closed following verification burrows are empty (through site monitoring and scoping).

1. A suitable homeowner education package for distribution to residents / new owners;

2. A suitable road sign program warning of the presence of mountain lions and the need for reduced speeds and increased caution;

3. A suitable CC&R provision limiting unsupervised outdoor pets and pet feeding practices that may encourage mountain lions to enter residential yards in search of food; and

4. A suitable mountain lion safety plan.

The Project’s CC&Rs shall include a provision specifically requiring future homeowners to comply with the requirements of the Mountain Lion Program.

City of Corona
-Planning Division
Once prior to issuance
of Certificate of
Occupancy for each
phase of development
Prior to issuance of Certificate
of Occupancy first production
unit.

Proof of program documents and
CC&Rs and placement of
information at model home
complex.

Halt construction

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Sanctions for NonCompliance
Potential day roosts for pallid bat (e.g., caves, crevices, mines, hollow trees, buildings, etc.) shall be inspected by a qualified bat biologist prior to initial ground disturbance. If bats are roosting, a bat exclusion plan shall be prepared and submitted to CDFW for review prior to impacts. If a colony is discovered during the breeding season (March-October), the biologist shall determine appropriate avoidance measures, including, but not limited to sound walls, buffers, and project phasing/timing, to prevent disturbance to the colony until all young are weaned and capable of foraging independently.

Division that a project
biologist has been retained
during initial on-site
disturbance activities.

City of Corona
-Planning Division
-Development Services Division
Once at plan check
(review of construction
bid documents); As
needed during
construction
activities for each phase
of development
Note on grading plans. Plan
check (review of construction
bid documents); At least once
during
construction of each phase of
development
Review of construction bid
documents; on-site inspection.

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Sanctions for NonCompliance
Mitigation Measure BIO-MM21. Crotch’s Bumble Bee. In the event the Crotch’s bumble bee (Bombus crotchii) status is listed as candidate, threatened or endangered by the CDFW at the time of construction, the following measures shall be implemented.
• Clearing/ground-disturbing activities shall be prohibited from February 1 through September 30 within suitable habitat for the Crotch’s bumble bee. As part of this requirement, if construction is proposed during this period, a qualified biologist shall go out and mark all of the suitable habitat on site, which must be avoided and fencing provided around any accessible areas until at least September 30. A letter report documenting the actions performed and completion of this measure shall be provided to the City of Corona prior to any disturbance of the Project site. Construction activities may commence in areas outside of suitable habitat for the bee. • For construction between October 1 and January 31, a pre-construction survey is required within suitable habitat to confirm that no nests occur on site. Should any nests be identified, the Project biologist shall consult with CDFW to determine if permits are required. Clearance within that portion of the property determined by the biologist to support a nest and a suitable buffer shall be avoided until consultation with the CDFW determines activities can resume or the site is no longer occupied. If the pre-construction survey identifies no nests, then construction activities may proceed as normal. A letter report documenting the actions performed and completion of this measure shall be provided to the City of Corona prior to any disturbance of the Project site. If consultation with the CDFW is required a second letter report shall be provided documenting the CDFW determination, requirements and approval prior to moving forward with construction activities on that portion of the Project site.
• Pesticides considered harmful to the Crotch bumble bee shall be prohibited during construction.

The Project CC&Rs shall explicitly prohibit the planting of the non-native plant species identified by Mitigation Measure BIO-5.

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Certificate of Occupancy
for each phase of
development
PDF BIO-2, Toxics – The proposed project is designed to utilize natural drainage patterns for the flow of surface water.

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Sanctions for NonCompliance
PDF BIO-6, Barriers – The proposed project will include theme walls along project perimeter streets adjacent to public streets, and will include walls and fencing located where public view and/or important interfaces are of concern. The proposed project will incorporate special edge treatments designed to separate development areas from open space areas. These areas of native landscaping and fencing will serve to minimize unauthorized public access, domestic animals predation, and illegal trespass and dumping. Exclusion fencing will be permanently placed where development abuts avoided and adjacent open space areas. The exclusion fence will be a minimum of eight feet in height and will be installed and maintained for the purposed of controlling human and pet access (cats and dogs) into the open space area and be in compliance with MSHCP requirements. The fencing will be permanent and will be maintained in perpetuity.

Approval of the fencing design will be required by the City of Corona prior to project initiation.

City of Corona
-Planning Division
Once during plan check
(project design- related
measures); once prior
to issuance of grading
permit for each phase
of development or as
necessary during
construction
(constructio n
measures); Once prior
to issuance of
Certificate of Occupancy
for each phase of
development
Plan check (project designrelated measures); Prior to
issuance of grading permit for
each phase of development
(construction measures);
Prior to issuance of Certificate
of Occupancy for each phase
of development
Review of Project plans,
construction documents, and onsite inspection
Withhold grading or
building permit; halt
construction; withhold
Certificate of
Occupancy
PDF BIO-7, Access – Access points between native habitats and the project development will be posted with signage requesting residents to stay on the trails and not to disturb habitat. Yard fencing with no back gate will reduce access to native habitats adjacent to the project.

City of Corona
-Planning Division
Once during plan check
(project design- related
measures); Once prior
to issuance of
Certificate of Occupancy
for each phase of
development
Plan check (project designrelated measures); Prior to
issuance of Certificate of
Occupancy for each phase of
development
Review of Project plans; On-site
inspection
Withhold grading or
building permit;
Withhold Certificate of
Occupancy
PDF BIO-8, Pets – Uncontrolled pets, feral dogs and cats can predate on native wildlife species. Appropriate signage will be posted requesting residents leash their pets. Homeowner Educational pamphlets will be used to inform them of the potential impacts by uncontrolled pets on native habitats and to request residents be good stewards of the land and prevent or limit their domestic cats from being allowed to openly hunt in the avoidance area.

If changes are made to the project footprint to include earth-moving activities in areas not previously studied, additional archaeological investigations shall be required.

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Sanctions for NonCompliance
Mitigation Measure CR-2: Archaeological Monitoring. At least 30-days prior to application for a grading permit and before any grading, excavation and/or ground disturbing activities on the site take place, the Project Applicant shall retain a Secretary of Interior Standards qualified and RPA-certified archaeological monitor to monitor all ground-disturbing activities in an effort to identify any unknown archaeological resources/TCRs and assist with avoidance, preservation and/or mitigation per the City's Mitigation Measures on known resources.

CRMP shall be approved by the
City and consulting tribal groups.

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Sanctions for NonCompliance
for each phase of
development
Mitigation Measure CR-5: Discovery of Human Remains. In the event that human remains (or remains that may be human) are discovered at the project site during grading or earthmoving. the construction contractors, project archaeologist, and/or designated Native American Monitor shall immediately stop all activities within 100 feet of the find.

City of Corona
-Planning Division
-Public Works Div.

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Sanctions for NonCompliance
Measure CR-7 and other appropriate or concerned agencies to signify the satisfactory completion of the project and required mitigation measures.
for each phase of
development

Generally, these deposits range in depth from 10 to about 20 feet.

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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
• Landslide Debris (Qls): All landslide debris that could adversely affect the proposed development shall be removed to expose the underlying competent bedrock. Generally, these deposits range in depth from 10 to about 29 feet, but may range up to around 35 feet in depth. • Removals Along Grading Limits: Removals of unsuitable soils shall be required prior to fill placement along the grading limit. A 1:1 projection, from toe of slope or grading limit, outward to competent materials shall be established, when possible. Where removals are not possible due to grading limits, property line or easement restrictions, removals shall be initiated at the grading boundary (property line easement, grading limit or outside the improvement) at a 1:1 ratio inward to competent materials. Where this reduced removal criterion is implemented, special maintenance zones may be necessary. Affected areas shall be established, minimally, as a 1:1 projection from suitable removal bottom to finish ground surface. This condition is mainly expected in the slope areas. Where the projection intersects the face of the slope, the potential for distortion of the slope in response to post-grading settlements exists and provisions for future maintenance of such slopes shall be provided.

City of Corona
-Development Services Division
Once during plan check;
As needed during site
grading
Plan check; As needed during
grading activities
Review of engineering
reports/plans
; On-site inspection
Withhold grading or
building permit; Halt
grading and
construction activities

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Sanctions for NonCompliance
Mitigation Measure GEO-3: Subsurface Drainage. Canyon subdrains are proposed as depicted on Figures 1 through 7 of the Geotechnical Report and shall consist of 6-inch and 8-inch diameter pipes and shall be constructed in accordance with the details shown in Appendix IV of the Geotechnical Report. Final determination of drain locations shall be made in the field. Outletting of subdrain systems shall require coordination with the Project Civil Engineer in determining suitable facilities to accept to drain water.

Consideration shall be given to increasing the overexcavation depth to mitigate for highly expansive soils, if warranted.

Depths of overexcavation shall extend one (1) foot below the deepest utility line.

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-5: Fill Materials. Excavated on-site soils may be used as compacted fill. The fill materials to be used as compacted engineered fill shall be free of organics, debris, deleterious materials, and rocks over 6 inches maximum dimension, and must be approved by the project geotechnical engineer or project geologist prior to use. Import soils, if required, shall be evaluated by the project geotechnical engineer for suitability prior to delivery. Import soils shall be free of trash, debris or other objectionable materials. All import fill shall have engineering characteristics similar to the on-site soils.

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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.

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

City of Corona
-Development Services Div.

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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.

Option 1 - Conventional Footing:

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Option 2 – Post-Tensioned Foundation:

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

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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.

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.

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:

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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.

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

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.

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