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HomeMy WebLinkAboutWPO201500015 Review Comments Bond Inspection 2018-08-208/17 - Free State Run Inspection, WP0201500015 As -built: The inspection noted the following deficiencies below. Please complete the remaining items in order to get approval for a reduction or release of the current bond amount: Biofilter (Bioretention, Lvl 1): • This is a level 1 bioretention (not anything else), because the CDA is 0.66ac it must have a 2' media filter depth (Min). Action: Remove mulch & trees; Add 6" (Min) of biomix soil & place 3" mulch on top; Install trees & plug/container plants. • Show the planting plan meets Section 6.8 (plants, location, type). • Install lined (riprap/grass) channel to bioretention for the concentrated discharge that appears to be coming down slope from ditch line above • Permanently stabilize (w/ grass) the drainage area above going to the facility • Building setbacks: The bioretention should be place 10' from building; 50 feet if up -gradient • Provide certified materials layer test report Underground Detention: • Clean out sediment layer accumulating at bottom of pipe. 3" orifice appears to be buried under sediment. • Parge brick & stone (area around pipes) and clean out brick & debris from MH bottoms (i.e. Str- D2) • Install ES-1 at Str-D1 end, and key -in 8' long riprap OP • Certification of proper dimensions & installation Detention Pond: • Remove trees on embankment; trees should be prevented from growing in a 10' buffer around embankment • Provide embankment certified compaction & fill material test reports. • Provide I'freeboard above the spillway • Install & key -in 8' OP Once these items are completed, you may request another inspection. Regards, David James Civil Engineer I