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• • <br /> We recognize that these bioretention areas are large as compared to DOE miniinum of�5% of the contributing <br /> drainage are. And we have tried hard to achieve this 5% goaL However, the existing site condition and the <br /> project as a parking lot do not allow us to go that far: <br /> 1. The amount of contributing drainage area for each bioretention area is limited due to site grading <br /> constraints. The parking lot mList tie into existing pavement/curb elevations along all outer edges. We <br /> have graded high and low points into the site to pushed runoff into collection points but we have limited <br /> flexibility as we try to keep grades at reasonable magnitudes for parking lot use. <br /> 2. We would like to keep the bioretention areas larger to encourage water infiltration. The conservative <br /> siring of these bioretention areas will help to encourage infiltration of a greater portion of site runoff and <br /> reduce stormwater entering the drainage system through the underdrain pipes. This will help to reducc <br /> peak flows in the downstream coinbined sewer system. <br /> 3. �1'he large size bioretention cells will create a similar appearance to tl�e existing bioretention cells north <br /> of�the site. '1,hey will impi�ove thc aetithe�tics of the ovel•all parl<iil� loi. <br /> We will provide ceinent extruded curb along the entire perimeter of the bioretention areas. Curb openings will <br /> be installed to allow runoff to enter each bioretention area. <br /> The attached sketch shows the grading revisions. Please take a look. If these revisions are acceptable to you, <br /> we will submit the revised drawings for your approval. <br /> Thanks <br /> Leif Johansen, PE <br /> Project Engineer <br /> Reid Middleton <br /> Engineers � Planners � Surveyors <br /> 425-741-3800 � Fax: 425-741-3900 <br /> From: Ding Ye <br /> Sent: Tuesday, September 01, 2015 4:01 PM <br /> To: Kirk Brooks <br /> Cc: Leif Johansen <br /> Subject: RE: 1001 N Broadway, building demo and parking lot construction <br /> Hi kirk, <br /> Thanks for forwarding Jane's comments. We will look into it. <br /> Regards. <br /> Ding Ye, PE <br /> LEED AP, CCCA <br /> Senior Engineer <br /> Reid Middleton <br /> Engineers � Planners � Surveyors <br /> 2 ���� <br />