J-1503050-13(a10) Carderock N Swale Maint Spec 2020_Amend 06 (Att 27).pdf

J-1503050-13(a10)

PLANTING ZONE 1

1. Planting zone 1 is located in the stream channel and along the banks and bed of this zone. Annual maintenance will be required to maintain herbaceous cover and prevent colonization by woody species, both of which are required to maintain drainage efficiency after construction.

a. At the end of the first growing season after construction, use a mower, string trimmer, or other mechanism to remove all woody species that grow along the bed and banks.

b. Throughout the growing season, conduct mowing and trimming within the entire zone to maintain vegetation to a height between 6 and 8 inches.

c. At the beginning of each growing season, woody species and invasive weeds are to be removed by hand or treated with an approved herbicide.

d. All mowing or trimming activities shall be conducted with care so as not to cause erosion or damage to infrastructure.

PLANTING ZONES 2 AND 4

1. Planting zone 2 is located along the top of banks with a purpose of replacing existing forest that was removed during the construction process and establishing riparian buffers in areas that will not interfere with existing utilities, infrastructure or operations. Planting zone 4 is similar to zone 2 but with an emphasis on lower growing trees and shrubs with more ornamental appeal.

a. Monthly during the first growing season mow the native grass / plant ground cover to remove invasive weed and woody species maintaining a height of 8 inches.

b. For the second year and beyond, mow the groundcover once annually at the beginning of the growing season.

c. At the beginning of the growing season each year, inspect for invasive weed or woody species and remove as needed in same manner as item C for zone one.

d. Care is to be taken not to damage any trees or shrubs planted intentionally.

2. During landscape installation, buck guards and other protective devices will be installed to protect trees and shrubs from deer damage.

a. These protective devices can be removed if they present a danger or begin to inhibit growth.

PLANTING ZONE 3

1. Planting zone 3 is a lawn area intended to provide easy maintenance access to infrastructure while protecting underground utilities from root damage and maintaining sight line near roads.

a. This planting zone is to be mowed to a maximum of 6 inches throughout the growing season.