Install one (1) new retractable, keyed bollard to limit unauthorized vehicles to access the developed special event area of at William B. Layton Park in the Truckee River Outlet Parcel, a subunit of Tahoe State Recreation Area (TSRA) located in Tahoe City, CA. To accommodate ADA access around the new bollard, widen the existing paver walkway to 8’ to allow for 48” clearance on either side of the new bollard.
• Remove four (4) square feet of pavers and base material to access native soil;
• Excavate six (6) cubic feet (16” in diameter and up to 54” deep) of the native soil beneath the pavers with gas-powered auger and hand tools;
• Fill the excavated hole with weed-free imported drain rock to the depth of about 42” below grade and hand tamp;
• Place bollard in cavity and add an additional 18” of tamped drain rock around the base to ensure the bollard remains plumb;
• Fill the cavity with approximately six (6) 60# bags of sack concrete to roughly 4” below grade; and
• Replace as many original pavers as possible to narrow the visible hole around the bollard dress-ring;
• Excavate 8’ long x 4” wide x 8” deep on either side of existing walkway with hand tools;
• Fill with 4” of weed-free base rock and compact;
• Drill ten (10) holes up to 5/8” wide by 3” deep (horizontally), into the outer edge of the existing concrete edging to accommodate ½” wide by 6” long rebar dowel pins, spaced no more than 24” apart; and
• Fill the excavated area with concrete and smooth to existing concrete edging and rebar pins.