SC 07-18-2019_revised 8/9/23 CITY OF CUPERTINO SUSTAINABILITY COMMISSION
Environmental Education Center 22221 McClellan Road
Thursday July 18,2019 4:00 p.m.
MINUTES
PLEDGE OF ALLEGIANCE
At 4:04 p.m. Chair Weber called the meeting to order and led the Pledge of Allegiance.
ROLL CALL
Commissioners Present:Anna Weber, Gary Latshaw,Angela Chen,Meera Ramanathan,Vignesh
Swaminathan
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Staff: Gilee Corral,Acting Sustainability Manager;Cheri Donnelley, Environmental Program Manager
Guests:Bruce Karney,Anne Ng, other member of the public.
1. APPROVAL OF MINUTES
Draft minutes of June 20,2019 meeting were reviewed. Commissioner Chen moved and Commissioner
Latshaw seconded to approve the minutes.The motion carried unanimously.
POSTPONEMENTS -None.
i
ORAL COMMUNICATIONS
Anne Ng,Cupertino resident,introduced herself to the Commission.
WRITTEN COMMUNICATIONS-None.
Chair Weber moved and Commissioner Chen seconded to reorder the agenized items as.follows: New
Business before Old Business. The motion carried unanimously.
NEW BUSINESS
6. Subject:Presentation on greenhouse gas emissions inventory metrics with consultant DNV GL
Chair Weber opened Public Comment and the following individual spoke:
Bruce Karney spoke in favor of conducing annual greenhouse gas emissions inventories and setting annual
goals,with consequences if the City fails to meet its goals.
Chair Weber closed Public Comment. Commissioners asked Karney clarifying questions and discussed the
possibility of purchasing carbon offsets as potential consequences for not meeting GHG goals.
The DNV GL consultant,Ben Butterworth,gave a presentation on GHG inventory metrics via conference call
and responded to Commissioners's questions. Issues raised by Commissioners included: accuracy of inventory
methodology,how direct access emission factors are calculated,verification of data,setting per capita targets,
etc.The Commission discussed these issues as well as the merits and drawbacks of an annual approach to
conducting GHG inventories and potential of including consequences for not meeting GHG targets.
1
OLD BUSINESS
2. Subject: Discuss Green New Deal legislative efforts on the federal and state level and consider
making a recommendation to the City Council to sign a resolution in support of H.R.109
(Representative Ocasio-Cortez) and S.Res.59 (Senator Markey) and AB 1276 (Assemblymember
Bonta)
Gilee Corral recommended that the Commission decide if they wished to endorse the bills to City Council or
decide to create a local Green New Deal(GND)resolution.The Commission discussed the pros and cons of
these options. Commissioner Latshaw noted potential benefits of supporting GND efforts,including:may
influence other support for the bills,possible connection to the City's declared Climate Emergency,etc.
Commissioners expressed concerns that the GND bills covered areas outside their purview,how to implement
a local GND,and the legislative advocacy adding too much to their work load.The Commissioners agreed to
watch the GND legislation action at the federal level and see where the bill ends up in the House.
Commissioner Swaminathan moved and Vice-Chair Latshaw seconded to take up the Green New Deal
discussion at a future Commission meeting.
3. Subject: Sustainability Speaker Series planning
The Commission discussed details of the Bea Johnson/Zero Waste event and agreed to aim for a 6:30 p.m. to
8:00 p.m. timeframe with one hour talk and thirty minutes for Q&A.The Speaker Series Subcommittee will
meet with staff to plan logistics and report back at the next Commission meeting.
4. Subject:Discuss and select agenda topics for upcoming Sustainability Commission meetings
Commissioners discussed with staff the upcoming items to be scheduled,including the reach code update and
a Green Stormwater Infrastructure plan. Commissioner Latshaw passed out a handout on a recent
presentation by Silicon Valley Clean Energy(SVCE) staff on the model reach codes.
The Commission agreed to the following agenda topics and meeting dates:
August 15 Commission meeting:
- Green Stormwater Infrastructure plan update from staff
- CAP Report update from staff
- Speaker Series Subcommittee update on Bea Johnson event planning
- Fall Festival tabling
August 29 Commission meeting:
- The Commissioners agreed to add a Special Meeting on August 29 from 4:00 pm to 6:00 pm to discuss
the SVCE model reach codes and the CALGreen Tier 1 and Tier 2 options. Staff will schedule SVCE
staff and Building Division's consultant to attend and contribute to this discussion.
- The Reach Code Subcommittee (Commissioners Swaminathan and Ramanathan)will meet and report
back at this meeting.
October 17 Commission meeting:
Green New Deal
2
Chair Weber moved and Commissioner Swaminathan seconded to approve the agenda items and dates as
agreed.The motion passed anonymously.
5. Update on Buy Clean California Act policy development and Bay Area low carbon concrete codes
initiatives
Corral gave an update on regional efforts to create model code addressing low carbon concrete requirements.
She passed out a handout on a draft version of low carbon concrete building code developed by the County of
Marin.
STAFF AND COMMISSION REPORTS
Commission updates:
- Commissioner Swaminathan gave an update on his travels and sustainable practices he observed in
Singapore.He announced that he has been elected to serve on a Citizen Advisory Board to the Santa
Clara Valley Transport Authority(VTA).He updated the Commissioners on upcoming bike-related 1
events: Silicon Valley Bike Coalition Summit and a pop up bikeway event on August 1st.
- Speaker Series Subcommittee members Vice-Chair Latshaw and Commissioner Chen will meet to
discuss the Bea Johnson event and possible topics for other events.
Staff updates:
- The City of Cupertino will be receiving the full Beacon Award this year. More details to follow.
- Administrative items regarding the Sustainability Commission budget and City email system.
- Sustainability Division will have a new Sustainability Manager in early August.
- Silicon Valley Clean Energy has launched its FutureFit heat pump water heater program.
ADJOURNMENT-6:29 p.m.
i
a
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3
7/18/19
PENINSULA
CLEAN ENERGY
Local Amendment to Code
("Reach Code")
Los AOtos Environmental
Commission
July 8, 2019
Goal - Increase Electrification of Buildings
emissions redudions and decarbonization
CA ExecutiVe Order B-55-18 far Car5on NeUtralltV bV 2045
Sourcmg clean electricity has never been easier
Summary about Code
Title 24 puovidet Uhe folliimng for tbree yeas until the next mde cyde:
Building %hwayi iEneB Code)
r Duhl-Fueledleleckntity+naturalgai)-amsteTjeaivemodeliirliii
All-Electrlc-a cost Jedive model or liit
EV Cha:ng (CalGteen)
A minimumJ) Bam and foieledtlcvehide diaigingstajioni per
building type-single bmily, multhmily, commeiiial
Reach Codes - What & Why
Wlly
Maintalning the lowes} cost construction option
(all-electric) developers to build
cleaner, healthier, lower cost buildings fueled by
pollution free electricity.
- Santa Clara county leads the state m EV
adophon iate. The base recommendation is
too low to meet local need. Installing
l chargmg stations later cost 2-4x as much.
7/18/19
Reach C- ode - EV Charging
C.ilGihen tPsrl 111 H iovid !I mliilmnm ituuiiemtnli +ni eath ripzcj OT EV CkmJ pri hulkllng lype
___J LNuf_=!a'fa!tiE'aM!alT)tTalaa!SN
--- ""'RsWm"" - ' :""r ;a"7 ilw';'111nt u-ni""""'i -"". 'Cr;dlx" "' - " " - " "" 'level 2-" " " ' " " _
JI
Mnlunllwilllng lO%otlobliurtx €aprble :vvaeli2i,Ciimmeitlal 't%otiomliJ!(ei Gipable rti.!'!7aJo}".,
Ta rurit a +z.ith tiiilr Toi FV ihriJn4 Iniieair lhr Quamlty. Reailln .in(/oi Ch*i(lng Sp*sd a'fi"'-
l.7...s ff-'- u'!L'!(T)5:dNWA9'ffl'imTin)ffifiA ..- I
" '%tWnl&l':""""-""" ffl """" :"-','aQ "' " "" "-" * "" "" "' M,a(il-,, : ' l'-'ao'-i
MulllUnltDwrlling -ii 4 levzl2 ' L ;'--;_t '
Comwiil ' ?__=_
(bta_ m mpitmli+llltaesmffll
What can we do with Code
Intmdute chhnge la liiail amendmenfl hlhin one pathway that enaiuiags the ieledion ofthe
otherpa}hway HenisanaampleioiSingleFamilyhamx
NiHnlied Ciiilz . B!I@ Cii!* B!!I Cailh %xdi Code Biie Coilp Riith Cone Bite Cafe
IntirminttlCoit' 5o to js.ioo to 4is.ooo 9o
Intitmtnlil SoliiThriil SnlitTnttmxl
Crihon'Emliiloni Tiiu %nh!i Toni.' l'aunj( TolB Piinnili ii
FtsuntntyolUill Mait latit s a % Z'
A bun on @xi vvaxld tetul+tn ttnly All-Flittnc bxlldlHi In L
mnniij be omplsned wtllun kh* qWdkng Cbde
Sample Recommendation
Buildlngs: Adop! a Reach lde tO enmurage developen tO leled h@alThi@i, iafeg all-electric buildtngi.
0 hinoeailngtbeaiitioconmuciforfoiilliueledbuilillnxipthlipnhwaybecomesless
ath'actlVe.
a Niiie: nahiralgail'uelalhameialieadyaiitaboutS5.(jXlmowhimnmud
o AdeveliipertanseleckthelowstmitphihwayAll-Elediic
EV: IJloptaReachCoderefied5antiClaraCount7smuthhigherthxnavetageadoptiantate,
pmvldeimoteopponltlafrE'llaimthlnthemul(lI'm'ilycommun'%andiamoneybydolngio
durlng constnictkin, rather than tetnnfitbng Ihtet
Questions?
Reach Code Websifes:
SrliconValleyReachCodes.org
2019 Buik)ng Elti.lnax0on & Elf Inliailnndnni
PENINSULA
CLEAN ENERGY
Appendix Slides
What is Cost-Effective
Definition ol Ctst Effedivenai Ixpplis to BuildingiOnly)
a 'aanyquiieilrneasunemuffsneatleastasiuudiontheutllitybillaslhemeaiuieitidjcostda
a So,ijameasurecostigl5iX),ijmustive615a)armonioniutureulilltybllls
The default mb lak 'ntle 24mkhou} lom amendment) it ainildeieil aiit el1Tectlve by the
(aklnmla EnetHy Commision.
Will More Electric or All-Electric Help?
Cost Savings
Lower first costs by not constructing natural gas
infrastrudure
- Operational costs (dependent on many factors)
Lower risk pathway according to California Energy
Commission
Healthier air quality from eliminatlng Indoor combustion
according to California Air Resources Board
Massive carbon redudlon compared to current dual fuel
(natural gas + electricity) buildings
7/18/19
Already included in 2019 Title 24 Code
PerIormance EneBDestgn Ratin((EDRI ' Pencentage
Compliarice Maigin
Solar Photovoltks Sized to ofTset annual kWh nh
(PV) Insballation consumption of mixed-%il
Eledric-ready 120V/20Aforfuture eledric
waterheater inmillation
These model codes...
Represent maxlmum found cogt-effective
(lalance regional consistency and ability for customization
Strong suggestions are not formatked
Live in Energy Code, but can be integrated with other codes
Should be reviewed and refined through your normal processes
Mandatory for New Construction,
Additions. Alterations
Cliilhri [liylng
2{0V/504 iliiu)l
240V/30A (II(ulla
Code Supporting Eledriftcation
ResidentialEnelW
Hlth Fffl
IPtlliwhy .'l
Mitttl lutl
I(IR Mtrgin - 10
Ell (%lhivx7 li
FDR Mri(ln = [1
Jlleqnke
Bull!lngi NnllillnBi
7/18/19
Single and Two-family New Construction Multifamily New Construction (-3 stories)
Nonresidential
f
t
[ffim
Frequently Asked Questions
Additions/Alterations/ADus? - Electric-ready req% only
High Rise Multifamily? - Carve-out adderl to code with results -Aug/Sep
Mixed Use? - Average of compliance margins required in other spaces,
weighted by floor area
Core and Shell Nonresidential? - Exception for core-and-shell which
allows plumbing to be installed with no increased performance required.
When gas meter is installed (i.e.. the tenant would like gas) reach code is
required. (currently under development)
Where Are We Now?
For each building type, seled 1 & 2, 1 & 2 & 2A, or Other (specify)
Single and Two-Family
Multifamily (<3 stories)
Nonresidentlal
Repork out on gH'% thinking. Thls is not a commlhnent.
Discussion
What works?
What is still unresolved;'
How closely aligned are we? How important is that?
7/18/19
Electric Vehicle Code
CALGrecn Enliancernenti
EV Terms, Charge Rates
Level 1 aaTnckle Chargmt)aa
SkandaId FtutehOld Otilm 15-20 Amt), 120V AC
Dnvlng dlstante provlded: 3-4 miles/hour
Level 3 =DC Fast Charging / SuperCliargmg"
24-350kW
DIIVlng dlstance plOVlded 72-1,200 milH!/hOu}
EV Terms, Readiness of Charging Station
EV Capable - !%me hsemby nequrreo
Panel capaclty, racettay [conduR) only ak c+ltlcal areal
(undBlgrountl plnCh pOlnti, ate.) DeTlnillon IS LEGS
skdngenk than CocGreen 2019
EV Ready - Pliig & Plan
Panel CapfflClty, raCeWaV (contuii), iivercurrent pniFectlon
deVICe (blaakw)} wire, receptcle & slgnage.
Ca n rerer io level i or level 2
Single and Two-family New rnnqtrnrtintl
1',... l1llevel2EdCapableioranepaiklng 2Ell.tpaceitotl:
Multifamily New Construction L'm'n
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I n% kxnl 2 EV " ' 20% ketil 2 an um+i' One ktwl2 EV RrtdV ?iii dwilllH: CaJjhlltOl !VCrpible >2ilunili OtalltlWllllngunlti,
I nullillngi wlth >17 a 25% 1!V112 EV %i!y I 10% In affotbhlr houilng)
I
nnlkt - yss tie lavd I FV Rird7 190% In affonlrbls hiiuilntl
won-gesioentiai,orricegicomrnerciaii.o.:':1
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ITOI iullirlngt with ht Itri) IO . ao+i tv c,,,ht, o, EV iil!,i, a ()nt 100 101(81. ouiion {oi
Hrtdng 1111(Ill 80}W DC hit Cll!I0I+ Hit IOa
7/18/19
Where Are We Now?
For each building type, identify 4 0K as is, or
Increase Quantity, Readiness, or Charge Rate
Slngle and Two-Family
MultiTamily (<3 stories)
Nonresidential
Repork out on gggJ thinking. This is not a commitment.
Discussion
What works?
What is still unresolved?
How closely allgned are we? How important is that?
Tools and Resources Adoption Tools & Resources
[.
i.
Implementation Tools & Resources Implementation Tools & Resources
7/18/19
How do we go from here to there?
Conceptual Next Steps
Staff agreement on proposal
What is needed for this:'
Sitakeholder Engagement(s)
What is needed for khis7
Refine as warranted
Including this topic on Council calendar
NillllAl l'llllllll dll' 111111 111dllllllll Ill II l'
What is needed? Staff Report? Other7
Wrap-up
Summarize findings of a'Where are we Now'a
Schedule suppork for your upcoming internal, stakeholder. or council
meetintls
Develop additional tools/resources
Questions?
Reach Code Websites'
PenrnsulaReachCodes.org
SlliconValleyReachCodes.org
lutlalnihlllly Coiiiillntloi
County or Srnlh Cma. DO!
Rkondii@imigiiv iiig
!honi 6}0 !}1-lil77
PENINSULA
CLEAN ENERGY
i'.?i iuiramanuvt
Reach Code Dcvclopmant Tirneline
Dgvtlopmem oT Mntel Rextli Codex
Develo p Cuijomiied EV Coii Ilenefi+ Antlyiii
Itltnlily Tooli and T+nteiiei for Adoption hnd
Provide Tt'thnlzl Aiiiii.inte loi Implt'mrnjmlon
Next Steps
Achvik!
Ilevniw Proposed Reach Codai wikh your ciky staff memlrs
Share ihlt WltF lmpo7nt (iimmunity gmups and mmmisiloni
Engage Coniullajion suppod by contaThng your pec5va 00Sfl'CEl9JCE nipnFabve
Requait $lOk (arant hm PCE/SVCE
a Slgn up Tor )une 6" EV Inlraib'uclune Code Ihbbinat
Whsn does your dty plan hi vola iin all new 'n!!e 24 language?
PENINSULA
CLEAN ENERGY
Compliance and Enforcement
7/18/19
Plan Check / Permit - Compliance Form
Thli pioiatj
Mixed-fuel midence (Ophon 3), Total EDR Compllance Margln k 2. m,"""":,n"""
7,.,j.3 '# l
Mixed-fuel nonresldentlal bullding (Option 2), Compliance Mangin k 9ola
IlThl-p-l-t=l-
I / nOim!II
I
I
- I
- I
--- II . ' =I l" -- I
itiaiaixrtutaii++mt+ i ., '4 u fiu(vv<
--a---i '
Plan Check / Permit - Compliance Form
Why CA & Bay Area?
New JEV vs. New Gas Car
Tm Chttmlrl Hull EV it §0J12 ikttlti IN nam mir } Y!! it
6- ..::=:=.' i-sm-
o--=-av o bmaaai=y*......
p==-=-==-=- Q4#1-=
Velut': nhi Irttulivei Iletxm § 3ednaly Gainline Mt nltmnae Intumnw
EV Interest & Adoption
Residentsvsry intenested in adopting EVs
PCESurvey: Inteiast in adoptlng is
independent ofvvhetherthey have a
Charging access is the #1 concern
Mll41lhlilakllaHilAl'li%altl
a 71nlOexistingEVdriverslikelytogeta2!"'EV
a 70% of non-EV tlrivers aaex}remely'a intevsted in
gettlngan EV fthey knevvcharging would
be readrly avarlable
ffl
Local Economic Impacts
Reduced fueling costs for residents
a By 2025 appmximately 100,000 EVs in PCE and SVCE
a EVsavingsovergas>rSl,200+/year
Reduced capital expenses
a 50,000 new housing units
a EVReachCodec91.Sk/unitatnewconstructlon
a 57k/unitforretnofit
Snvings (and cosjs)sbay local
Feedback on Draft & Response
EV Ready is prderredi
- Access to Power
Level I ain be effed've, reduoe aistsi
- High Level I to Level 2 Rauo
Impad on Affordable %using:
- Lowerpriwer requirerrmb
- Incenkiws
Future Tedtnologles:
- Large raoeway
- Load management
DC fast diarging:
- Optlon k ommerdal sites
7/18/19
EV Requirements, Summary Affordable Housing
1. Adjusted Code Requirement
a 10% Level2 EV Ready ICALGreen)
a 90% Level 1 EV Ready
2. FinancralSupportPmgam(Under
0 TocovermosttirallofinstallcostaboveSttecode
0 Available in cities that adopt neach codes
0 Available durlng the 2020-2022 code cycle
0 Speciflcfundingamountsaneunderdevelopment
- Technical assistance on implemermion, induding policies such as pricing,
access mntrol, etc.
Reach Code Map (Electrification v Peformance)
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Eledrification
Brisbane Staff Reach Code Proposals
Key Terms
Compllr ate Margin - HOW myth 10(I rnttgy r !uil!lng ntz Ihrn iltle ttmt. ttHtai'.td !I y Hrni*nl.igt le ! . 5%) or
tDR l! 3. I Jalnli
Matulnjo7 %4 ulrementi - }irtuiri Ihrl 1111111 he Inablltd. xi rpplitrhlt
l'raitil7Nvi Pathway - 0tmonilnlt tiimplhna* uiing i liij o/ tp*i/it mtaiurei l! g nriln wtti liril ittott+yl
PURPOSE of the Reach Code
Encourage developers to seled cleaner electric pathway
preserve at least one lowest cost construction pathway for each buildlng
WDe (]ust meet the code, no reach)
How can we do this')
sy maintaining Title 24 baseline code far all-electric buildings, tfie all-electrc
pathway becomes more appealing to developers from a cost perspectlve and
resulting In a 10Wer emissions, healthier building.
Low-Carbon Concrete Building Code DRAFT v7.l June 19, 2019
Low-carbon concrete building code v 7.1
(Commentary lan'guage'in red. Administrative language is specific to Marin County, Califorriia; other
jurisdictions must adapt and adjust as needed.
'Summary of update: 'With this version 7, limit values are proposed in Table 19.07.050.1. These limits are
intended to be ambitious in reducing emissions while still practicable-not imposing excessive burden on
' stakeholders. They key off of national averages published in 2014 by the National Ready Mixed Concrete
Association (NRMCA), though not uniformly. For lesser strength concretes (f', < 3,000 psi), we use 90% of the'
NRMCA values, while for higher strength concretes, presumed to be supplied by more sophisti'cated
producers who have more capacity to innovate, we use 80% of NRMCA values at 4000 psi and 70% of
NRMCA values at 5000 psi and greater.
The longer-term goal is to bring the concrete industry into alignment with announced emission reduction.
goals of multiple relevant government and trade bodies, such as:
'1) The State of California e.g., the Global Warming Solutions Act (AB32) of 2006, and Buy Clean California
(AB 262) of October 15, 2017;
2) The American Institute of Architects and Architecture 2030 (The 2030 Challenge);
l3) The Structural Engineering Institute (SE 2050 Initiative)
:4) The County of Marin (Drawdown: Marin dimate action plan)
i5) World Cement Association (Climate Action Plan)
:To meet a goal of zero emissions by 2050, 7eductions imposed by code would have to ratchet down concrete
emissions on a schedule something like the following (based on 2014 NRMCA values)
2020 109j.:(currentproposal)
2023 18%
2026 26%
2029 34%
2035 56%
2038 " 67%
2041 78%
2044
2047
2050 .lQq% (requiring zerocarbon technologies we.have yet to invent)
Code language and limifs will be finalized'at that meeting.
Bruce King / County of Marin PO6397 Son Rafael, CA 94903 (415) 987-727l bruce@ecobuildnetwork.org
Low-Carbon Concrete Building Code DRAFT v7.l June 19, 2019
Chapter 19.07 is added to Marin County Code, as follow5:
19.07 - REDUCED CARBON CONCRETE REQUIREMENTS
Express finding: Pursuant to Section 17958.2(a) of the Ca1ifornia,Health and Safety Code,
the Marin County Board of Supervisors hereby finds the following modifications to the
2019 California Building Code Section 1901.2 an,d 20l9'California Residential Code
Sections R402.2.1, R404.1.3, R506.1 and R608.5,'as shown in Sections 19.07.040
regulating allowable mix design and mate'rials for plain and reinforced concrete, are
reasonably necessary. This is because the County'of Marin is bordered by sea water on
three sides and subject to direct adverse local impact from sea-level rise as the result of
construction-related contributions to climate change, significantly including carbon
emissions from cement production.'
Marin County, like most jurisdictions in North America, has great leeway in modifying
6r adding amendments to. the template code, in this case being the California
Building code which in turn is based on the fnternational Building Code. Both law
and common sense dictate that the County should state its particular reasons
(findings) for the amendment/addition.
19.07.010 - Purpose
The purpose of this chapter is to provide practical standa
composition of concrete, as defined herein, for all co
that maintains adequate str:ength and durability for
same time reduces greenhouse gas emissions
irements for the
ng purposes,
a n and at the
composition.
19.07.020 - Definitions
For the application of this chapter the follo
Concrete - Any approved com
hardened conglomerate in a nce with
EnvironmentalProductDecla EPD) Envi
quantified environmental informatio the"l
comparisons between products fulfi(li
bound together into a
of this code.
I Product Declarations present
cycle of a product to enable
function.
Global Warming Potential (GWP) is the total greenhouse gas emissions resulting from
the extraction, manufacture and delivery of a material or product into its service form.
Bruce King / Coun +y of Marin PO6397 Son Rafael, CA 94903 (4l 5) 987-7271 bruce@ecobuildnefwork.org
Low-Carbon Concrete Building Code DRAFT v7.l June 19, 2019
rhese definiti6ns are ge;'rerally taken from or repeat definitions'pmvided by the"
,'Int@riiJational Standards Organization, 150. Some additionaruseful definitions are:
.. Carbon Dioxide Equivalent or CO2 equivalent or CO,e. unit for comparing the
ra8iative forcing of a greenhouse gas to that of carbon dioxide.
Embodied Carbon - Informally used for"Global Warming Potential"'
,Global,Warming Potential (GWP) is also sometimes informally called "embodied
.carbon."...ako "carbon footprint", Global warming potentiatis also used'outside of
these pmvisions as a characterization factor describing the'radiative forcing impact
, 6f one,mass-based unit of a given greenhouse g,as re-latiW.'to that of carbon dioxide
over a given period of time, used to calculate Carbon.Dioxide Equivalent..
Greenhouse Gas (GHG) gaseous constituent of the atmosphere that absorbs and
emits radiation at specific wavelenr;ths within the spectrum of infrared radiation
emitted by the earth's surface, the atmosphere, and clouds.
Greenhouse Gas Emission mass of a greenhouse gas released to the atmosphere.
19.07.030 - Scope
The requirements of this chapter shall apply to all plain and reinforced concrete
installed within the unincorporated areas of Marin County.
Afters'ome debate, the committee decided t:o riot -recommend (for now) to try to
apply thjs code to precast concrete or to manufactured concrete such as cement
masonry units (CMU) or other structural or non-structural building materials in
order to simplify the policy for initial adoption and implementation.
19.07.040 - California Building Standards Code amendffients
Section 1901.2 of the 2019 California Building Code is hereby.amended to add the
following language to the end of the first sentence: "and Chapter 19.07 of Marin County
Code".
Section R402.2.1 of the 2019 California Residential Code is hereby amended to add the
following language to the end of the first sentence: ", as amended by Chapter 19.07 of
Marin County Code".
Section R404.1.3 of the 2019 California Residential Code is hereby amended to add the
following language to the end of the first sentence: ", as amended by Chapter 19.07 of
Marin County Code".
Section R404.1.3 of the 2019 California Residential Code is hereby amended to add the
following language to the end of the second sentence: ", as amended by Chapter 19.07
of Marin County Code".
Section R404.1.3 of the 2019 California Residential Code is hereby amended to add the
following language to the end of the third sentence: ", as amended by Chapter 19.07 of
Marin County Code".
Section R404.1.3 of the 2019 California Residential Code is hereby amended to replace
the language of the fourth sentence as follows: " When ACI 318, ACI 332, PCA 100 or the
,.irovisions of this section, as amended by Chapter 19.07 of Marin County Code, are used
to design concrete foundation walls, project drawings, typical details and specifications
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Low-Carbon Concrete Building Code DRAFT v7.l June 19, 2019
are not required to bear the seal of the architect or engineer responsible for design,
unless otherwise required by the state law of the jurisdictiqn,having authority."
Section R506.1 of the 2019 California Residential Code is he;reby amended to add the
following language to the end of the first sentence: ", as.amended by Chapter 19.07 of
Marin County Code".
Section R608.5 of the 2019 California Residential Code is hereby amended to add the
following language to the end of the first sentence: ", as.amended by Chapter 19.07 of
Marin County Code".
19.07.050 - Compliance
Compliance with the requirements of this chapter.shall be demonstrated to the chief
building official through any of the compliance options of this section.
Cement limits
for use with prescriptive
compliance methods 19.07.050.1
and 19.07.050.2
GWP limits
for use with performance compliance
methods 19.07.050.3 and 19.07.050.4
Minimum specified
compressive strength
f'c, psi (5)
Maximum ordinary Portland cement
content,lbs/yd3 (1, 2, 4)
Maximum Global Warming Potential,
GWP, kg COze /m3
up to 2500 (3,4)362 260
2501 to 3000 410 289
3001 to 4000 456 313 '
4001 to 5000 503 338
5001 to 6000 534 356
6001 to 7000 594 394
7001 and higher 657 433
up to 3000 light weight 512 578
3001-40001ight weight 571 626
4001-5000 light weight 629 675
Table 19.07.050.
Notes
(1) Portland cement of any type
above the tabulated value when
to have a plant-specific global warmi
allowable cement content would be (
limitations
mum cement content may be increased proportionately
cement, or blended cement, demonstrated by approved EPD
(GWPps) lower than 1040 kg COze/metric ton. The increase in
/ GWP.S) %,
A,blended cement with an established GWPPS of 900 kg. COze/metric ton is used
frjr a 3,000 psi contrete mix, so the maximum allowable amount of cement then.becomes:
o(1040/900) x 410 = 474 Ibs per cubic yard
(2) Cement or GWP limits shown can be increased by 10% for concretes demonstrated to the Building Official as
requiring high early strength. Such concretes could include:
a. Precast,prestressedconcrete jsiO/oat(,e,ig(,ta71,,,,W,-,c,'7. '-,
b. Beams and slabs above grade
Bruce King / County of Mt>rin PO6397 Son Rafael, CA 94903 (415) 987-7271 bruce@ecobuildne+work.org
Low-Carbon Concrete Building Code DRAFT v7.l June 19, 2019
c. Retaining walls requiring immediate backfill
(3) Concrete with designated strength less than 2500 psi is not subject to minimum strength and reinforcing
limitations of ACI 318.
(4) Concrete using clay, or both clay and cement, as bindpr shall 'be design,ed and constructed consistent with
successful historical precedent or substantiated by test data, and is subject to approval by the Building Official.
Clay-based concrete systems, historically known as earthen construction, include adobe (unfired earth) blocks,
compressed earth blocks, cob (or puddled earth'), and rammed eartj"i. Concrete using both clay and cement,
historically known as soil-cement, include rqller-compactedconcrete or road base, stabilized rammed earth,
and stabilized earth block.
(5) The permit applicant must designate the time allotted for a' concrete mix to reach its minimum specified
compressive strength, be it 28; 56, 84 days or more.
(6) The maximum cement content may be intreased by 10% above the tabulated value for concrete mixes for which
the coarse aggregate is at least 50% reclaimed concrete, and/or is comprised of synthetic limestone aggregate manufactured
primarily from carbon emissions. . Is IO% the right)allowance? . '-
. A hillside residence will be built requiring 4500 psi c'oncrete. The concrete doesn't I
;need to attain full strength for many months, however, so a mix.design is chosen that has 500'
:lbs. of cement aM 400 Ibs. of slag as binder, which is known to reach 3800 psi at 28 days, and'
4500'psi after 56 days. Table 19.07.050.1 sets a limit of 6471bs. of cement per cubic yard; for
,which.the mix easily complies.
19.07.050.1 Prescriptive Method - Cement content of a concrete mix using this method
shall not exceed the value shown in the Table 19.07.050.1. Use of this method is
limited to concrete with specified compressive strength not exceeding 5,000 psi.
19.07.050.2 Prescriptive Method-Project - Total cement content shall be based on total
cement usage of all concrete mix designs within the same project. Total 'cement
content for a project shall not exceed the value calculated according to Equation
19.07.050.2.
Equation 19.07.050.2:
Cemproj < Cemallowed
where
Cempro) = 2Cem,v, and Cemallowed = ICemi:mVn
and
n = the total number of concrete mixtures for the project
Cem, = the cement content for mixture n, kg/m3 orlb/yd3
Cemlim = the maximum cement content for mixture n
per Table 19.07.050.1, kg/m3 orlb/yd3
V, = the volume of mixture n concrete to be placed, y,,13 0r m3
Applicant can use yd3or m3for calculation, but must keep same units
throughout
Bruce King / County of Morin PO6397 Son Rafael, CA 94903 (415) 9B7-727l bruce@ecobuildnetwork.org
Low-Carbon Concrete Building Code DRAFT v7.l June 19, 2019
19.07.050.3 Performance Method-Mix Global WarmingPotential of a concrete
mix, based on an approved environmental product declaratiqn (EPD), shall not
exceed the value given in Table 19.07.050.1. '
19.07.050.4 Performance Method-Project Total GWP (GWPpr(i;)Of all concrete mix designs within the
same project shall not exceed the project limit (GWPallowea) determined using Table 19.07.050.1 and
Equation 19.07.050.3.
Equation 19.07.050.3: GWPp,,l < 'GWP,iioweo
where
and
n = the total number of concrete mixtures for the project
GWP, = the global warming potential for mixture n per mixture EPD, kg/m3
GWP1;,, = the global warming potential limit for mixture n
per table 19.07.050.1, kg/m3
v, = the volume of mixture n concrete to be placed, yd3or m3
Applicant can use yd3 or m3 for calculation, but must keep same units
throughout
BruceKing/CountyofMarin PO6397 SanRafael,CA 94903 (415)987-7271 bruce@ecobuildnetwork.org
Low-Carbon Concrete Building Code DRAFT v7.l June 19, 2019
A "Five over'One"podium:b-iyirding4's p(anned for an urban block: five wood-
framed stories' of apartments overa post-tensioned slab on concrete columns and'shearwalls'
on a mat slab parking garage. '
Mix 1: Post-tensioned stab
. i 90 cubic yards @ f, = 6,000 psi'
GWP(fromEPD)=475 .: ".o.,.#
"' )
j
:I
,l
.1
')
r
,)if,
-t_-.=':.':(:7,".T"=""-"'I
Mix 2: Walls and columns
60 cubic yards @ f, = 5,000 psi
.GWP (from EPD) = 340
Mix 3: Mat foundation
200 cubic yards @ fc = 3,000 psi
GWP (from EPD) = 240 "
1'. CalculatethetotalproiectGWP
'GWPp-=)=(90X(GWPi))+(60xGWPJ+(200xGWPa)
= (90 x 475) + (60 x 340) + (200 x 240)
= 111,150,
2. CalculatetheallowedGWPlimit UselO%aHowableincreaseforMixl
'G.WP(yH(B4rB0=(90XGWPmix:iXl-1)+(60XGWPB(xg)+(200XGWPmrxg)
(90 x 457 x 1.') + (60x 355 )+ (200 x 289)
, = 124,343 > 111,150 -project complies
BruceKing/CountyofMarin PO6397 SanRafael,CA 94903 (415]987-7271 bruce@ecobuildnetwork.org
Low-Carbon Concrete Building Code DRAFT v7.l June 19, 2019
19.07.060 - Verification and Enforcement
As a condition prior to the issuance of every building
concrete, the permit applicant shall be required to
Concrete Compliance Declaration on a form that shal
official and reviewed for compliance by the builda
permit.
ng placement of
Reduced Carbon
chief building
issuing the
As a condition of such building permits p
following placement of concrete
certificates and EPDs p a
with the Reduced Carbon Co
permit. The batch certificates a EP
building department prior to allowi
on inspections
be required to submit batch
p ader that demonstrates compliance
ration on file with the building
reviewed for compliance by the
er inspections to be scheduled.
For projects involving placement of concrete by, or on behalf of, a public works, parks,
or similar department the director of such department, or his/her assignee, shall
maintain accurate records of the total volume (in cubic yards) of all concrete placed, as
well as the total compliant volume (in cubic yards) of al( concrete placed, and shall
report this data annually to the governing body in a form expressing an annual
compliance percentage derived from the quotient of total comp(iant concrete volume
placed divided by total concrete volume placed.
When deviations from compliance with this section occur.the chief building,official is
authorized to require evidence of equivalent carbon reductions from the portions of
remaining construction of the project to demonstrate alternative compliance with the
intent of this chapter.
19,07.070 - Exemptions
1. Hardship or infeasibility exemption If an applicant for a covered project believes
that circumstances exist that make it a hardship or infeasible to meet the requirements
of this chapter, the applicant may request an exemption as set forth below. In applying
for an exemption, the burden is on the applicant to show hardship or infeasibility.
Application. The applicant shall identify in writing the specific requirements of the
standards for compliance that the project is unable to achieve and the circumstances
that make it a hardship or infeasible for the project to comply with this chapter. The
applicant may not petition for relief from any requirement of the 2019 California Energy
Code (Title 24, Part 6) and referenced standards, or the 2019 California Green Building
Standards (Title 24, Part 11) of the California Building Standards Code. Circumstances
that constitute hardship or infeasibility shall include, but are not limited to the
following:
a. There is a conflict between the provisions of an applicable green building
rating system or the California Building Standards Code, other state code
provisions, other requirements of this title or conditions imposed on the project
through a previously approved planning application;
b. There is a lack of commercially available material necessary to comply;
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Low-Carbon Concrete Building Code DRAFT v7.l June 19, 2019
c. The cost of achieving compliance is disproportionate to the overall cost of the
project;
d. Compliancewithcertainrequirementswouldimpairthehistoricintegrityof
buildings listed on a local, state or federal list ortejiste'r gf historic structures as
regulated by the California Historic Building Code (Title 24,' Part 8).
(2) Grantin@ of exemption If the chief building official determines that it is a hardship
or infeasible for the applicant to fully meet the requil;ements of this chapter and that
granting the requested exemption will not cause the btiilding to fail to comply with the
2019 California Energy Code (Title 24, Parj 6) and referenced standards, or the 2019
California Green Building Standards (Title 24, Part 11) of the California Building
Standards Code, the chief building official shall determine the maximum feasible
threshold of compliance reasonably achievable f6r the project. In making this
determination, the chief building official shall consider whether alternate, practical
means of achieving the objectives of this chapter can be satisfied. If an exemption is
granted, the applicant shall be required t6 comply with this chapter in all other respects
and shall be required to achieve the threshold of compliance determined to be
achievable by,the chief building official.
(3) Denial of exception If the chief building official determines that it is reasonably
possible for the applicant to fully meet the requirements of this chapter, the request
shall be denied and the applicant shall be notified of the decision in writing. The project
and compliance documentation shall be modified to comply with the standards for
compliance.
BruceKing/CountyofMorin PO6397 SanRafael.CA 94903 (415)987-7271 bruce@ecobuildnetwork.org