20190276 Ver 1_Exhibit 1-Anchor QEA Cofferdam Detail_20190416

IMPERVIOUS I
ANCHOR MEMBRANE Uu
SANDBAGS AS NEE[
PUMP A
XCAVATE AS NEEDED TO PROVIDE
DDITIONAL PUMP SUBMERGENCE
TALL COFFERDAM AS SHOWN BELOW
NEEDED, USE ADDITIONAL PUMP TO
WATER WORK AREA, SEE NOTES
,MPTON LAKE DAM, WORK AREA
R AROUND WORK AREA
/ HEIGHT NOT TO EXCEED 3'
)RK AREA
SAND BAGS OR BIG BAGS
NOTES:'"
THIS PUMP -AROUND DETAIL WAS PREPARED FOR THE CONVENIENCE OF THE CONTRACTOR, THE CONTRACTOR SHALL PREPARE AND
SUBMIT DETAILS OF THEIR DESIGN AND SHALL BE RESPONSIBLE FOR CONTROL OF WATER IN THE WORK AREA.
INSTALL IMPERVIOUS MEMBRANE ON THE UPSTREAM SIDE OF THE SANDBAG COFFERDAM. WEIGHT IMPERVIOUS MEMBRANE TO THE
SANDBAG COFFER DAM AND TO THE STREAM BED WITH ADDITIONAL SANDBAGS ON TOP OF THE MEMBRANE.
SOME EXCAVATION CAN OCCUR UPSTREAM OF THE COFFERDAM TO PROVIDE ADDITIONAL CAPACITY AND A LOW POINT TO PUMP
FROM.
IF LEAKAGE OCCURS THROUGH THE COFFERDAM, A PUMP CAN BE PLACED BETWEEN THE COFFERDAM AND WORK AREA TO PUMP
WATER BACK ABOVE THE COFFERDAM, OR BELOW THE WORK AREA IF TURBIDITY REQUIREMENTS ARE MET.
A GEOTEXTILE BAG OR OTHER METHODS MAY BE REQUIRED TO CONTROL TURBIDITY AND MEET REGULATORY REQUIREMENTS.
INSTALL VELOCITY DISSIPATION WHERE THE PUMPED WATER IS DISCHARGED IF THE POTENTIAL OF EROSION EXIST. IF THE WATER IS
DISCHARGED INTO A DEEP POOL OR ONTO BEDROCK, VELOCITY DISSIPATION MAY NOT BE NECESSARY.
A MINIMUM BASE FLOW OF 0.475 CUBIC FEET PER SECOND (CFS), APPROXIMATELY 213 GALLONS PER MINUTE (GPM) IS TO BE
MAINTAINED IMMEDIATELY BELOW THE WORK AREA PER REGULATORY REQUIREMENT. CONTRACTOR TO VERIFY FLOW RATE
REQUIREMENT IS MET IN FIELD WITH FLOW METER OR OTHER METHOD.
WHEN WORK IS COMPLETE, THE COFFERDAM SHALL BE REMOVED IN ITS ENTIRETY.
THIS PLAN WAS PREPARED WITHOUT THE BENEFIT OF A SURVEY. ALL PROPOSED IMPROVEMENTS SHALL BE VERIFIED IN THE FIELD
PRIOR TO INSTALLATION.
Publish Date: I User: W. EDSEL NOT TO SCALE
Filepath: \\asheville1\asheville\Projects\Daniel Corp\High Hampton\CADD\AQ-Titleblock-2017-SegoeUl.dgn
ANCHOR EXHIBIT 1
QEA HIGH HAMPTON DAM VALVE REPLACEMENT
SANDBAG COFFERDAM PUMP -AROUND SYSTEM