145 ALVERSON BLVD 2018-04-25 - Laserfiche WebLink

2.0 SITE DESCRIPTION 2.1 Existing Site Conditions The subject site consists of a City of Everett park located at 145 Alverson Boulevard Everett, Snohomish County, Washington. The subject site and surrounding properties fall within an area designated as the Everett Smelter Plume (ESP). The ESP is an area identified as containing elevated levels of lead and arsenic resulting from proximity to an historic smelter facility located along the Puget Sound. The subject site consists of an approximate 20-acre park located approximately ten miles northwest of downtown Tacoma. Work is limited to two specific areas in the park, including the northern part of the park and the southern part of the park. The subject site is located adjacent to the Tacoma Narrows, and is surrounded by residential properties. 2.2 Proposed Construction Activities Proposed construction activities at the subject site include removing vegetative surface materials and one foot of surface soil from select areas at the subject site. Following removal and offsite disposal of this material, clean fill and surface materials, including vegetation, will be placed throughout the subject site. The scheduling and phasing of BMPs during construction is provided in Section 4.0. Storm water runoff volumes were calculated using the hydrologic model KCRTS as required by the SWMWW. The storm water control devices that will be used during construction activities were designed using the two-year storm event since construction will not occur over a long timeframe. The following summarizes details regarding site areas: Total subject site area: 15.91 acres Area of soil disturbed by construction activity: 5.45 acres Percentage of impervious surfaces at subject site: 9% Percentage of impervious surface after construction: 9% TESC Plan and SWPPP 2 June 2015 American Legion Memorial Park Page 5