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Attachment 2 Rincon Consultants, Inc. 1 449 15th Street, Suite 303 Oakland, California 94612 510 834 4455 OFFICE info@rinconconsultants.com www.rinconconsultants.com Date: March 15th, 2023 Project No: 23-14064 Becky Hopkins, Assistant to the City Manager City of Pleasanton 123 Main Street Pleasanton, California 94566 Via email: _BHopkins@cityofpleasantonca.gov Subject: City of Pleasanton CAP 2.0, Greenhouse Gas Analysis of Natural Gas Replacement with Renewable Natural Gas, Pleasanton, CA 94566 Dear Ms. Hopkins: The City of Pleasanton is proposing to purchase Senate Bill (SB) 1383 compliant renewable natural gas (RNG)to replace the use of fossil natural gas in municipal owned buildings. This effort is primarily for the purposes of meeting the procurement target for organic waste set for the City set by SB 1383.The proposed RNG is a product of wastewater and diverted food waste.The project developer is able to comply with the record keeping requirements of SB 1383 for gas produced at a publicly owned treatment works(POTWs) and demonstrate that the produced RNG meets the eligibility requirements for meeting the procurement target as outlined in 14 CCR Section 18993.1 (h). The project generating the RNG is connected to a distribution system in Southern California and therefore would be procured by the City through a contract. While the purpose of obtaining RNG for municipal owned buildings is to meet the procurement target for the City set by SB 1383, the replacement of fossil natural gas with RNG also has greenhouse gas (GHG) emission reduction benefits.The following sections of this memorandum describe legislation demonstrating how the environmental attributes of RNG may be applied to GHG emission estimates, summarize the GHG emission reductions associated with RNG procurement by the City, and provide a cost-benefit analysis associate with the GHG savings. RNG Environmental Attributes Under California Air Resources Boards (CARB's) Low Carbon Fuel Standard (LCFS) program,the one-to- one replacement of fossil natural gas with pipeline-injected RNG is based on book-and-claim accounting. Book-and-claim accounting refers to the chain-of custody model in which decoupled environmental attributes(in this case GHG emissions reductions) are used to represent ownership and transfer of the fuel without regard to physical traceability.To ensure that environmental attributes are not double counted, chain-of-custody evidence must demonstrate that the environmental attributes linked to the injected RNG are tied with corresponding quantities of natural gas withdrawn.) This can be demonstrated through contracts between the producer and the entity withdrawing the natural gas. For 1 Low Carbon Fuel Standard (LCFS) Guidance 19-OS E n v i r o n m e n t a l S c i e n t i s t s r E n g i n e e r s