02/26/2003 Env Bd Packet - Laserfiche WebLink

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• • Agenda Item 6C Environmental Board Meeting Date: February 26, 2003 Topic: Mueller Office Facility /Plan Review Background: The Mueller site is located on James Street and Lake Drive. See site Location Map (attachment 1). Application information is submitted as (attachment 2). The MLCCS and Pre - settlement Vegetation is submitted in (Attachment 3). Vegetation on the site is classified as Non - native dominated long grasses with 4 to 10 percent impervious cover. Natural Resource Protection Zones are shown in (Attachment 4). Soils types and Permeability are depicted in (Attachment 5). Estimated surface water flow direction, flood plane and private wells are shown in (Attachment 6). Existing Trees are located on the Grading Plan (Attachment 2). Analysis: • There are no unique or remnant vegetation types on this site or around the site. Pre - settlement vegetation in this area is classified as Oak openings and Barrons. New Landscape materials should use Oaks for shade trees as much as possible. • There are no unique protection Zones associated with this site. • Soils on this site are very permeable. Infiltration rates range from 6 to 20 inches of water per hour. Because of the nature of Soderville soils, water tables tend to be very shallow. Surface water seems to go to the NW for the most part. There are many shallow (57' deep) in this area. Because of the nature of these soils, care must be taken to ensure proper infiltration design on the site. At least 3 feet, preferably 4 feet of separation between the seasonally high water table and the bottom of infiltration ponds and swales must be accomplished. Soil borings must demonstrate this separation. • City specifications for seed mixtures in swale and pond area should be used. • All sodded areas should be shown as irrigated. Four inches of topsoil should be thoroughly incorporated into the subsoil. • A sequencing plan should be submitted indicating soil and tree protection measures. All infiltration swale, pond, (and sod areas if possible) should be fenced of to traffic after construction. • A complete tree inventory should be submitted. The submitted Landscaping and Tree preservation Plan, shows existing 15 -inch trees (no indication of Species), on the south near a proposed infiltration swale.