King County Wastewater Division announced that contractors have finished digging out the tank area at the Murray CSO Control Project site last Thursday, November 13. The resulting hole is 60 feet deep – big enough to house the facility’s one million gallon underground storage tank. The tank will help keep sewage and stormwater out of Puget Sound.
Before the tank can be built, crews must install a 17-foot thick concrete base below the tank. The base will keep the tank from being pushed out of the ground by groundwater. Rebar will be installed in the next 10 days. Then nearly 5,000 cubic yards of concrete will be poured into the hole over three days to build the base.
About 20 trucks an hour will deliver concrete to the site to pour the base. Two concrete pump trucks will be located on the east side of Beach Drive SW to pump the concrete into the hole. Trucks will enter the site from Lincoln Park Way SW and exit using 48th Ave SW. Trucks waiting to pour will park on Fauntleroy Way SW and Lincoln Park Way SW.
Flaggers will direct traffic around the site. To maintain local vehicle access, no parking will be available from 7:00 am to 5:00 pm on the 7000 block of Beach Dr. SW and on Lincoln Park Way from Murray Ave. to Beach Dr. on pour days.
The contractor plans to complete the pour before Thanksgiving. No work is scheduled over the Thanksgiving holiday. Updated information will be provided when the dates for the pour are confirmed.
What to expect during the base pour:
- Concrete pours between 7:00 am and 5:00 pm for three days;
- Crews working on the east side of Beach Drive SW near Lowman Beach Park;
- Trucks parked on Fauntleroy Way SW near 47th Ave. SW and on Lincoln Park Way SW near the intersections of 47th Ave SW and Murray Ave. SW;
- No parking on the 7000 block of Beach Dr. SW between 7:00 am and 5:00 pm;
- No parking on Lincoln Park Way SW between Murray Ave SW and Beach Dr. SW from 7:00 am and 5:00 pm;
- Increased truck traffic entering and leaving the site during work hours;
- Traffic delays and congestion;
- East sidewalk of Beach Dr. S.W. closed between 7:00 am and 5:00 pm.