; (E) a per mile cost calculation for each linear mile of the southern border given the type of physical barrier, technology, tool, or other device chosen to achieve and maintain operational control for each linear mile; and (F) a cost justification for each time a more expensive physical barrier, technology, tool, or other device is chosen over a less expensive option, as established by the per mile cost estimates required in subparagraph (B). 103. Eradication of carrizo cane and salt cedar Not later than January 20, 2019, the Secretary, after coordinating with the heads of relevant Federal, State, and local agencies, shall begin eradicating the carrizo cane plant and any salt cedar along the Rio Grande River. II Grants 201. Operation stonegarden (a) In general Subtitle A of title XX of the Homeland Security Act of 2002 ( 6 U.S.C. 601 et seq.) is amended by adding at the end the following new section: 2009. Operation Stonegarden (a) Establishment There is established in the Department a program, which shall be known as Operation Stonegarden , under which the Secretary, acting through the Administrator, shall make grants to eligible law enforcement agencies, through the State administrative agency, to enhance border security in accordance with this section. (b) Eligible recipients To be eligible to receive a grant under this section, a law enforcement agency— (1) shall be located in— (A) a State bordering Canada or Mexico; or (B) a State or territory with a maritime border; and (2) shall be involved in an active, ongoing, U.S. Customs and Border Protection operation coordinated through a sector office. (c) Permitted uses The recipient of a grant under this section may use such grant for— (1) equipment, including maintenance and sustainment costs; (2) personnel, including overtime and backfill, in support of enhanced border law enforcement activities