Chapter 74-4 — MODIFICATIONS

74-4.002 Amendments to CBC. The 2019 California Building Code ("CBC") is amended by Divisions 72 and 74 of the Contra Costa County Ordinance Code and the changes, additions, and deletions set forth in this chapter. Section numbers used below are those of the 2019 California Building Code.

(a)

CBC Chapter 1 (Scope and Administration) is amended by the provisions of Division 72 of the Contra Costa County Ordinance Code and as follows:

(1)

Sections 103, 113, 114, and 116 of CBC Chapter 1 are deleted.

(2)

Section 105.2 (Work exempt from permit) of CBC Chapter 1, subsection 4 is amended to read:

Retaining walls that are not more than 3 feet in height measured from the top of the footing to the top of the wall and that have a downward ground slope at the bottom of the retaining wall not exceeding 1(vertical):10(horizontal), unless supporting a surcharge or ground slope exceeding 1(vertical):2(horizontal) or impounding Class I, II, or III-a liquids.

(3)

Section 107.2.1 (Information on construction documents) of CBC Chapter 1 is amended to read:

107.2.1 Information on Construction Documents. Construction documents shall include dimensions and shall be drawn to scale on suitable material. Electronic media documents may be submitted when approved in advance by the building official. Construction documents shall be of sufficient clarity to indicate the location, nature, and extent of the work proposed and to show in detail that it will conform to this code and all relevant laws, ordinances, rules, and regulations. The first sheet of each set of plans shall include contact information for the owner and the person or persons who prepared the plans. Plans shall include a plot plan showing all existing property lines labeled and fully dimensioned, the elevations of the top and toe of cuts and fills, and the location of the proposed building with distances to all property lines and to every existing building on the property. Instead of detailed specifications, the city building official may approve references on the plans to a specific section or part of this code or other ordinances or laws.

(4)

Section 110.1 (Inspections—General) of CBC Chapter 1 is amended by adding the following to the end of that section:

At the time of first inspection by the city building official, a California licensed Land Surveyor or Civil Engineer shall certify in writing that the structure is placed according to the approved set of plans. The written certification must include the site address and permit number. This requirement does not apply to alterations or repairs to existing structures that do not affect the exterior limits of the existing structures.

(b)

Section 420.13 (Electric vehicle (EV) charging for new construction) of CBC Chapter 4 (Special Detailed Requirements Based on Occupancy and Use) is amended to read:

420.13 Electric vehicle (EV) charging for new construction. Newly constructed Group R-1, R-2, and R-3 buildings shall be provided with infrastructure to facilitate future installation and use of electric vehicle (EV) chargers, and, where required, newly constructed Group R-2 buildings shall be provided with electric vehicle charging spaces equipped with fully-operational EV chargers, in accordance with the California Green Building Standards Code (CALGreen), Chapter 4, Division 4.1.

(c)

Section 907.2.10.9.1 is added to Section 907.2.10.9 (Existing Group R occupancies) of CBC Chapter 9 (Fire Protection Systems), to read:

907.2.10.9.1 Existing flat roof buildings. In existing flat roof buildings, the installation of a smoke detector that complies with California Residential Code Section R314.6 shall be required when a pitched roof is added on top of the existing flat roof and the solid sheathing of the flat roof is not removed.

(d)

Section 1405.2 is added to Section 1405 (Combustible materials on the exterior side of exterior walls) of CBC Chapter 14 (Exterior Walls), to read:

Wood shakes or shingles used for exterior wall covering shall be fire

treated unless there is a minimum of 10 feet from the exterior wall (including shakes or shingles) to the property line or the exterior wall faces a street.

(e)

In Section 1705.3 (Concrete construction) of CBC Chapter 17 (Special Inspections and Tests), Exception 1 is amended to read:

Isolated spread concrete footings of buildings three stories or less above grade plane that are fully supported on earth or rock, where the structural design of the footing is based on a specified compressive strength of no greater than 2,500 pound per square inch (psi) (17.2 Mpa).

(g)

Section 1810.3.9.3 (Placement of reinforcement) of CBC Chapter 18 (Soils and Foundations) is amended by deleting Exception 3.

(h)

Section 1905.1.7 (ACI 318, Section 14.1.4) of CBC Chapter 19 (Concrete) is amended to read:

1905.1.7 ACI 318, Section 14.1.4. Delete ACI 318, Section 14.1.4, and replace with the following: 14.1.4 - Plain concrete in structures assigned to Seismic Design Category C, D, E, or F. 14.1.4.1- Structures assigned to Seismic Design Category C, D, E, or F shall not have elements of structural plain concrete, except as follows:

(a)

Reserved.

(b)

Isolated footings of plain concrete supporting pedestals or columns are permitted, provided the projection of the footing beyond the face of the supported member does not exceed the footing thickness.

(c)

Plain concrete footings supporting walls are permitted, provided the footings have at least two continuous longitudinal reinforcing bars. Bars shall not be smaller than No. 4 and shall have a total area of not less than 0.002 times the gross cross-sectional area of the footing. A minimum of one bar shall be provided at the top and bottom of the footing. Continuity of reinforcement shall be provided at corners and intersections.

(i)

Section 1906.1 (Structural Plain Concrete—Scope) of CBC Chapter 19 (Concrete) is amended by deleting the exception.

(j)

Section 1907.1 (Minimum Slab Provisions—General) of CBC Chapter 19 (Concrete) is amended by adding the following sentence to that section: Slabs shall have a minimum reinforcement of 6-inch by 6-inch by 10- gauge wire mesh or equal at mid-height.

(k)

Appendix C and Appendix I of the CBC are incorporated into the City's building code. Appendix A, Appendix B, Appendix D, Appendix E, Appendix F, Appendix G, Appendix H, Appendix J, Appendix K, Appendix L, and Appendix M of the CBC are excluded from the City's building code.

74-4.004 Amendments to CRC. The 2019 California Residential Code ("CRC") is amended by Divisions 72 and 74 of the Contra Costa County Ordinance Code and the changes, additions, and deletions set forth in this chapter. Section numbers used below are those of the 2019 California Residential Code.

(a)

Sections R103, R112, and R113 of CRC Chapter 1 (Scope and Application) are deleted.

(b)

In Section R105.2 (Work exempt from permit) of CRC Chapter 1 (Scope and Application), subsection 3 is amended to read:

Retaining walls that are not more than 3 feet in height measured from the top of the footing to the top of the wall and that have a downward ground slope at the bottom of the retaining wall not exceeding 1(vertical):10(horizontal), unless supporting a surcharge or ground slope exceeding 1(vertical):2(horizontal) or impounding Class I, II, or IIIA liquids.

(c)

Section R314.8.1.1 is added to Section R314.8 (Existing Group R-3 occupancies) of CRC Chapter 3 (Building Planning), to read:

R314.8.1.1 Existing flat roof buildings. In existing flat roof buildings, the installation of a smoke detector that complies with Section R314.6 shall be required when a pitched roof is added on top of the existing flat roof and the solid sheathing of the flat roof is not removed.

(d)

Table R602.10.3(3) (Bracing Requirements Based on Seismic Design Category) of CRC Chapter 6 (Wall Construction) is amended as follows:

(1)

The title of Table R602.10.3(3) is amended to read:

TABLE R602.10.3(3) g

(2)

Footnote "g" is added to Table R602.10.3(3), to read:

g.

In Seismic Design Categories D0, D1, and D2, Method GB is not permitted and the use of Method PCP is limited to one-story single family dwellings and accessory structures.

(e)

Section R602.10.4.5 is added to Section R602.10.4 (Construction methods for braced wall panels) of CRC Chapter 6 (Wall Construction), to read:

R602.10.4.5 Limits on methods GB and PCP. In Seismic Design Categories D0, D1, and D2, Method GB is not permitted, but gypsum board is permitted to be installed on the opposite side of the studs from other types of braced wall panel sheathing. In Seismic Design Categories D0, D1, and D2, the use of Method PCP is limited to one-story dwellings and accessory structures.

(f)

Appendix H of the CRC is incorporated into the city's building code. Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, Appendix F, Appendix G, Appendix I, Appendix J, Appendix K, Appendix L,

Appendix M, Appendix N, Appendix O, Appendix P, Appendix Q, Appendix R, Appendix S, Appendix T, Appendix U, Appendix V, and Appendix W of the CRC are excluded from the city's building code.

74-4.006 Amendments to CGBSC. The 2019 California Green Building Standards Code ("CGBSC") is amended by Divisions 72 and 74 of the Contra Costa County Ordinance Code and the changes, additions, and deletions set forth in this chapter. Section numbers used below are those of the 2019 California Green Building Standards Code.

(a)

Section 202 (Definitions) of CGBSC Chapter 2 (Definitions) is amended by replacing the definition of Electric Vehicle Charging Space (EV Space) with the following:

ELECTRIC VEHICLE CHARGING SPACE (EV SPACE). A space intended for current or future installation of EV charging equipment and charging of electric vehicles.

(b)

Section 301.1.1 (Additions and alterations) of CGBSC Chapter 3 (Green Building) is amended to read:

Section 301.1.1 Additions and alterations. The mandatory provisions of Chapter 4 shall apply to additions or alterations of existing residential buildings where the addition or alteration increases the building's conditioned area, volume, or size. The requirements shall apply only to and within the specific area of the addition or alteration.

The mandatory provisions of Section 4.408 shall apply to the following types of construction or demolition projects for existing residential buildings:

Projects that increase the total combined conditioned and unconditioned building area by 5,000 square feet or more.

Alterations to existing structures impacting 5,000 square feet or more of total combined conditioned and unconditioned building area.

Demolition projects when a demolition permit is required.

Exception: Demolition projects undertaken because the enforcing agency has determined that the demolition is necessary to abate a public nuisance or otherwise protect public health and safety.

For the purposes of determining whether a project meets the 5,000 square-foot threshold, the enforcing agency may deem all phases of a project and all related projects taking place on a single or adjoining parcel(s) as a single project.

(c)

Section 301.3.2 (Waste diversion) of CGBSC Chapter 3 (Green Building) is amended to read:

Section 301.3.2 Waste diversion. The requirements of Section 5.408 shall apply to additions, alterations, and demolition whenever a permit is required for work.

Exception: Demolition projects undertaken because the enforcing agency has determined that the demolition is necessary to abate a public nuisance or otherwise protect public health and safety.

(d)

Section 4.106.4.2 (New multifamily dwellings) of CGBSC Chapter 4 (Residential Mandatory Measures) is amended to read:

Section 4.106.4.2 New multifamily dwellings. For any new multifamily dwelling other than a dwelling type specified in Section 4.106.4.1, if residential parking is provided, 10 percent of the total number of parking spaces at the dwelling site shall be electric vehicle charging spaces (EV spaces). Half of the EV spaces, but not less than one, shall be equipped with fully-operational electric vehicle supply equipment (EVSE). The remaining EV spaces shall be capable of supporting future EVSE. The location and type of each EV space shall be identified on construction documents. Calculations to determine the number of EV spaces shall be rounded up to the nearest whole number.

(e)

Section 4.408.1 (Construction waste management) of CGBSC Chapter 4 (Residential Mandatory Measures) is amended to read:

Section 4.408.1 Construction waste management. Recycle and/or salvage for reuse a minimum of 65 percent of the nonhazardous construction and demolition waste in accordance with Section 4.408.2.

Exceptions:

Excavated soil and land-clearing debris.

The enforcing agency may identify alternate waste reduction requirements if the agency determines that an owner or contractor has adequately demonstrated that diversion facilities necessary for the owner to comply with this section do not exist or are not located within a reasonable distance from the jobsite.

(f)

Section 4.408.2 (Construction waste management plan) of CGBSC Chapter 4 (Residential Mandatory Measures) is amended to read:

Section 4.408.2 Construction waste management plan. Submit a construction waste management plan for the project, signed by the owner, in conformance with Items 1 through 5 prior to issuance of building permit. The construction waste management plan shall be updated as necessary upon approval by the

enforcing agency and shall be available during construction for examination by the enforcing agency. The plan must do all of the following:

Identify the construction and demolition waste materials to be diverted from disposal by recycling, reuse on the project, or salvage for future use or sale.

Specify if construction and demolition waste materials will be sorted on-site (source-separated) or bulk mixed (single stream).

Identify diversion and disposal facilities where the construction and demolition waste material will be taken and identify the waste management companies, if any, that will be utilized to haul the construction and demolition waste material. A waste management company utilized to haul construction and demolition waste material must have all applicable city approvals.

Identify construction methods employed to reduce the amount of construction and demolition waste generated.

Specify that the amount of construction and demolition debris shall be calculated consistent with the enforcing agency's requirements for the weighing of debris. The owner shall ensure that all construction and demolition debris diverted or disposed are measured and recorded by weight or volume using the most accurate method of measurement available. To the extent practicable, all construction and demolition debris shall be weighed using scales. Scales shall be in compliance with all regulatory requirements for accuracy and maintenance. For construction and demolition debris for which weighing is not possible due to lack of scales or not practical due to materials being reused on-site or elsewhere or other considerations, a volumetric measurement shall be used. The owner shall convert volumetric measurements to weight using the standardized conversion factors approved by the enforcing agency for this purpose.

(g)

Section 4.408.3 (Waste management company) of CGBSC Chapter 4 (Residential Mandatory Measures) is deleted.

(h)

Section 4.408.5 (Documentation) of CGBSC Chapter 4 (Residential Mandatory Measures) is amended to read:

Section 4.408.5 Documentation. A construction waste management final report containing information and supporting documentation that demonstrates compliance with Section 4.408.1, Section 4.408.2, Items 1 through 5, and, when applicable, Section 4.408.4 or Section 4.408.4.1, shall be provided to the enforcing agency before the final inspection. The required documentation shall include, but is not necessarily limited to, the following:

Documentation of the quantity by weight of each material type diverted or disposed, consistent with the requirements of Section 4.408.2, Item 5, and receipts or written certification from all receiving facilities utilized to divert or dispose waste generated by the project that substantiate the amounts specified on the construction waste management final report; or

For projects that satisfy the waste stream reduction alternative specified in Section 4.408.4 or Section 4.408.4.1, documentation of the quantity by weight of each material type disposed and the total combined weight of construction and demolition waste disposed in landfills as a result of the project, the corresponding pounds disposed per square foot of the building area, and receipts or written certification from all receiving facilities utilized to dispose waste generated by the project that substantiate the amounts specified on the construction waste management final report.

(i)

Section 5.106.5.3 (Electric vehicle (EV) charging) of CGBSC Chapter 5 (Nonresidential Mandatory Measures) is amended to read:

Section 5.106.5.3 Electric vehicle (EV) charging. New nonresidential construction shall provide the required number of electric vehicle charging spaces (EV spaces) per Table 5.106.5.3.3. Each EV space shall be equipped with fully-operational electric vehicle supply equipment (EVSE). Each EV space shall be constructed in accordance with the California Building Code and California Electrical Code.

(j)

Section 5.106.5.3.3 (EV charging space calculations) of CGBSC Chapter 5 (Nonresidential Mandatory Measures) is amended to read:

Section 5.106.5.3.3 EV charging space calculations. For new nonresidential construction, the required number of EV charging spaces equipped with fully-operational EVSE is calculated in accordance with Table 5.106.5.3.3.

Exception: On a case-by-case basis, the building official may authorize new construction to include fewer EV charging spaces than would otherwise be required by Table 5.106.5.3.3, or require no spaces, if the building official determines either of the following:

There is insufficient electrical supply to the new construction to adequately serve the required number of EV charging spaces.

The cost of the new construction will be substantially adversely impacted by any local utility infrastructure design requirements that are directly related to the installation of the required number of EV charging spaces.

TABLE 5.106.5.3.3

(k)

Section 5.106.5.3.5 (Future charging spaces) of CGBSC Chapter 5 (Nonresidential Mandatory Measures) is amended to read:

Section 5.106.5.3.5 Designated parking credit. Each EV charging space required by Section 5.106.5.3.3 shall be counted as one designated parking space required by Section 5.106.5.2.

(l)

Section 5.408.1 (Construction waste management) of CGBSC Chapter 5 Nonresidential Mandatory Measures) is amended to read:

Section 5.408.1 Construction waste management. Recycle and/or salvage for reuse a minimum of 65 percent of the nonhazardous construction and demolition waste in accordance with Section 5.408.1.1.

Exceptions:

Excavated soil and land-clearing debris.

The enforcing agency may identify alternate waste reduction requirements if the agency determines that an owner or contractor has adequately demonstrated that diversion facilities necessary for the owner to comply with this section do not exist or are not located within a reasonable distance from the jobsite.

(m)

Section 5.408.1.1 (Construction waste management plan) of CGBSC Chapter 5 Nonresidential Mandatory Measures) is amended to read:

Section 5.408.1.1 Construction waste management plan. Submit a construction waste management plan for the project, signed by the owner, in conformance with Items 1 through 5 prior to issuance of building permit. The construction waste management plan shall be updated as necessary upon approval by the enforcing agency and shall be available during construction for examination by the enforcing agency. The plan must do all of the following:

Identify the construction and demolition waste materials to be diverted from disposal by recycling, reuse on the project, or salvage for future use or sale.

Specify if construction and demolition waste materials will be sorted on-site (source-separated) or bulk mixed (single stream).

Identify diversion and disposal facilities where the construction and demolition waste material will be taken and identify the waste management companies, if any, that will be utilized to haul the construction and demolition waste material. A waste management company utilized to haul construction and demolition waste material must have all applicable city approvals.

Identify construction methods employed to reduce the amount of construction and demolition waste generated.

Specify that the amount of construction and demolition debris shall be calculated consistent with the enforcing agency's requirements for the weighing of debris. The owner shall ensure that all construction and demolition debris diverted or disposed are measured and recorded by weight or volume using the most accurate method of measurement available. To the extent practicable, all construction and demolition debris shall be weighed using scales. Scales shall be in compliance with all regulatory requirements for accuracy and maintenance. For construction and demolition debris for which weighing is not possible due to lack of scales or not practical due to material being reused on-site or elsewhere or other considerations, a volumetric measurement shall be used. The owner shall convert volumetric measurements to weight using the standardized conversion factors approved by the enforcing agency for this purpose.

(n)

Section 5.408.1.4 (Documentation) of CGBSC Chapter 5 (Nonresidential Mandatory Measures) is amended to read:

Section 5.408.1.4 Documentation. A construction waste management final report containing information and supporting documentation that demonstrates compliance with Section 5.408.1, Section 5.408.1.1, Items 1 through 5, and, when applicable, Section 5.408.1.3, shall be provided to the enforcing agency before the final inspection. The required documentation shall include, but is not necessarily limited to, the following:

Documentation of the quantity by weight of each material type diverted or disposed, consistent with the requirements of Section 5.408.1.1, Item 5, and receipts or written certification from all receiving facilities utilized to divert or dispose waste generated by the project that substantiate the amounts specified on the construction waste management final report; or

For projects that satisfy the waste stream reduction alternative specified in Section 5.408.1.3, documentation of the quantity by weight of each new construction material type disposed and the total combined weight of new construction waste disposed as a result of the project, the corresponding pounds of new construction disposal per square foot of the building area, and receipts or written certification from all receiving facilities utilized to dispose waste generated by the project that substantiate the amounts specified on the construction waste management final report.

74-4.008 Amendments to CEBC. The 2019 California Existing Building Code ("CEBC") is amended by the changes, additions, and deletions set forth in Divisions 72 and 74 of the Contra Costa County Ordinance Code and this chapter. Section numbers used below are those of the 2019 California Existing Building Code.

(a)

CEBC Chapter 1 (Scope and Administration) is amended by the provisions of Division 72 of the Contra Costa County Ordinance Code and as follows:

(1)

Sections 103, 112, 113, and 115 of CEBC Chapter 1 are deleted.

(2)

Section 106.1 (Construction Documents - General) of CEBC Chapter 1 is amended by deleting the exception.

(3)

Section 106.2.1 (Construction documents) of CEBC Chapter 1 is amended to read:

106.2.1 Construction documents. Construction documents shall include dimensions and shall be drawn to scale on suitable material. Electronic media documents may be submitted when approved in advance by the building official. Construction documents shall be of sufficient clarity to indicate the location, nature, and extent of the work proposed and to show in detail that it will conform to this code and all relevant laws, ordinances, rules, and regulations. The first sheet of each set of plans shall include contact information for the owner and the person or persons who prepared the plans. Plans shall include a plot plan showing all existing property lines labeled and fully dimensioned, the elevations of the top and toe of cuts and fills, and the location of the proposed building with distances to all property lines and to every existing building on the property. Instead of detailed specifications, the county building official may approve references on the plans to a specific section or part of this code or other ordinances or laws.

(Ord. 570 § 6 (part), 2008: Ord. 554 § 3 (part), 2006; Ord. 537 § 1 (part), 2003)

(Ord. No. 600, §§ 2, 3, 6-25-2012; Ord. No. 630, § 5, 1-8-2018; Ord. No. 677, § 6, 5-26-2020)