220 OLYMPIC BLVD VA OUTPATIENT CLINIC 2023-02-09

Maintenance Indicators Maintenance should be scheduled if any of the following conditions are identified during inspection: I • The concrete structure is damaged or the tree grate or access cover is damaged or missing. • The curb inlet or inlet rack is obstructed. • Standing water is observed in the biofiltration chamber more than 24 hours after a rainfall event (use discretion if the BioPod is located downstream of a storage system that attenuates flow). • Trash and debris in the inlet rack cannot be easily removed at the time of inspection. • Trash and debris, invasive vegetation or sediment load in the biofiltration chamber is heavy or excessive erosion has occurred. Maintenance Equipment The following equipment is helpful when conducting BioPod maintenance: • Suitable clothing (appropriate footwear, gloves, hardhat,safety glasses, etc.) • Traffic control equipment (cones, barricades, signage,flagging, etc.) • Manhole hook or pry barI • Flashlight • Tape measure • Rake, hoe, shovel and broom • Bucket • Pruners • Vacuum truck (optional) I Maintenance Procedures Maintenance should be conducted during dry weather when no flows are entering the system. All maintenance may be conducted without entering the BioPod structure. Once safety measures such as traffic control are deployed, the access covers may be removed and the following activities may be conducted to complete maintenance: • Remove all trash and debris from the curb inlet and inlet rack manually or by using a vacuum truck as required. I • Remove all trash and debris and invasive vegetation from the biofiltration chamber manually or by using a vacuum truck as required. • If the sediment load is medium or light but erosion of the biofiltration media bed is evident, redistribute the mulch with a rake or replace missing mulch as appropriate. If erosion persists, rocks may be placed in the eroded area to help dissipate energy and prevent recurring erosion. • If the sediment load is heavy, remove the mulch layer using a hoe, rake, shovel and bucket, or by using a111 vacuum truck as required. If the sediment load is particularly heavy, inspect the surface of the biofiltration media once the mulch has been removed. If the media appears clogged with sediment, remove and replace one or two inches of biofiltration media prior to replacing the mulch layer. I • Prune vegetation as appropriate and replace damaged or dead plants as required. • Replace the tree grate and/or access covers and sweep the area around the BioPod to leave the site clean. • All material removed from the BioPod during maintenance must be disposed of in accordance with local environmental regulations. In most cases,the material may be handled in the same manner as disposal of material removed from sumped catch basins or manholes. I