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7.B. - Page 94 <br /> Redwood City Chapter 4.Environmental Impact Analysis <br /> As described in the 2007 FEIR (page 4.7-1),groundwater levels at the project site are approximately <br /> 10 to 15 feet bgs.The proposed modifications'maximum excavation would be 2 feet bgs.As such, <br /> the proposed modifications are not expected to expose or otherwise affect any below surface <br /> groundwater.As a result,there would be a less-than-significant new impact on groundwater <br /> resources from implementation of the proposed modifications. <br /> c. Substantially alter the existing drainage pattern of the site or area,including through the <br /> alteration of the course of a stream or river,in a manner that would result in substantial <br /> erosion or siltation on-or offsite? <br /> Less-than-Significant New Impact.As described in the discussion in Section 4.6.a,the construction <br /> contractor would implement a WQMP that would ensure that the construction activity does not <br /> result in a substantial increase in the rate or volume of stormwater runoff that would cause <br /> substantial erosion or siltation. <br /> While no streams or rivers would be directly affected by construction or operation of the proposed <br /> modifications,implementation of the proposed modifications would alter the existing drainage <br /> pattern within the site of the proposed modifications.As described in response to 3.6.a,the <br /> proposed modifications would result in the replacement of 5,004 sf of pervious surface with <br /> impervious surfaces. However,compliance with MRP Provision C.3 would minimize potential <br /> increases in stormwater runoff rates and volumes that would result in substantial erosion or <br /> siltation on or off the project site,thereby reducing new impacts to a less-than-significant level. <br /> d. Substantially alter the existing drainage pattern of the site or area,including through the <br /> alteration of the course of a stream or river? <br /> Less-than-Significant New Impact.As described in the discussion in Section 4.6.a,the construction <br /> contractor would implement a WQMP that would ensure construction activity does not result in a <br /> substantial increase in the rate or volume of stormwater runoff that would cause substantial erosion <br /> or siltation. <br /> While no streams or rivers would be directly affected by construction or operation of the proposed <br /> modifications,implementation of the proposed modifications would alter the existing drainage <br /> pattern within the project site.As described in response to 4.6.a,the proposed modifications would <br /> result in the replacement of 5,004 sf of pervious surface with impervious surfaces. However, <br /> compliance with MRP Provision C.3 would minimize potential increases in stormwater runoff rates <br /> and volumes that would result in flooding on or off the project site,thereby reducing new impacts to <br /> a less-than-significant level. <br /> e. Substantially increase the rate or amount of surface runoff in a manner which would result in <br /> flooding on-or offsite;create or contribute runoff water that would exceed the capacity of <br /> existing or planned stormwater drainage systems or provide substantial additional sources of <br /> polluted runoff? <br /> Less-than-Significant New Impact.As described in the discussion in Sections 4.6.a,4.6.c,and 4.6.d, <br /> the proposed modifications would result in an increase of 5,004 sf of impervious area at the project <br /> site.The new impervious area would increase the amount of runoff from the project site by 0.01 <br /> Addendum No.2 to the Environmental Impact Report for 4 49 September 2012 <br /> the Redwood City Costco Wholesale Project ICF 00154.12 <br />