Description: The Model Toxics Control Act (MTCA) governs the cleanup and prevention of contaminated sites that can threaten people's health and the environment in Washington State. Data for Mercer Island was downloaded as a CSV file from the Department of Ecology "What's In My Neighborhood?" website on January 22, 2018 and was converted to a GIS point shapefile based on latitude and longitude coordinates. It is important to note that these locations are approximate, and further verification should be done to make sure that each point is associated with the correct address.Site statuses include: Cleanup Started, Awaiting Cleanup, and No Further Action,More information about the Model Toxics Control Act can be found here.
Copyright Text: Herrera Consulting
2200 Sixth Avenue Suite 1100 Seattle, WA 98121
www.herrerainc.com
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Description: This dataset shows areas of Mercer Island that are infeasible for infiltration based on the overlap of erosion hazard areas, landslide hazard areas, and steep slopes (> 20%). This analysis was completed in January 2018 by Herrera Consulting as part of the Infiltration Infeasibility Study project (project manager for City: Patrick Yamashita, City Engineer). This dataset is for planning purposes only and additional considerations (depth to groundwater, infiltration setbacks from environmental and site features, and site soils) should be assessed on a site-by-site basis based on the specific criteria for the BMP under consideratioin..
Copyright Text: Herrera Consulting:
JENNIFER SCHMIDT, GISP
Spatial Science Manager
direct 206 787.8233 | main 206.441.9080
2200 Sixth Avenue Suite 1100 Seattle, WA 98121
www.herrerainc.com
Description: Polygons cover any point on the island where there exists another point within a 40 foot radius that has an elevation difference of more than 12 feet .Steps used to create feature class:1. Create grid of points, 4 foot on center, covering the entire island (approx 11 million records)2. Join elevation data to points from surface (2016 Geoterra Lidar)3. Create grid of 200 foot squares, each buffered 40 feet for overlap. (The script was failing when trying to process the entire island- broke up into smaller squares to be considered one at a time.)4. Run script in project folder, which selects a point, evaluates it against every point within 40 feet, and returns "1" if high slope condition is met, or "0" if not. (Script currently located in M:/ArcMap Documents/DSG/ForHolly/2019 Tree Slope Permit)5. Buffer "1" points, merge and smooth until it looks good (we weren't going for extreme accuracy)