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Layer: Holgate Lake Supplemental Depth to Groundwater (ID: 7)

Parent Layer: Groundwater

Name: Holgate Lake Supplemental Depth to Groundwater

Display Field: Lower_

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Holgate Lake Conceptual Site Model Depth to Groundwater 2. Source: 2007 GeoDesign, Inc. Description: A total of 885 data points were collected as part of this study. The data points, consisted of borehole logs, test pit logs, flow-test data, and groundwater depths. Each point was assigned a spatial location, soil units were classified according to the project-specific standards, depth to groundwater (if present) was recorded, and a relative assessment of data quality was assigned. In addition, GIS layers were created, regional and Study Area-specific geology and hydrogeology were assessed, lithologic cross sections were produced, and combination of data were used through an iterative process to produce the CSM presented herein. Development of the CSM involved several assumptions, creating uncertainties. While creating cross sections, borehole data was limited to a maximum distance of approximately 400 feet orthogonal to the section line. Favor was given to those logs closer to the section line and to logs with higher qualifiers. Groundwater data was greatly simplified; groundwater levels vary with time, season, and location. With the objective of identifying area of shallow groundwater, the groundwater measurements representing the highest elevation and, therefore, the shallowest groundwater were used. Due to these variations, the groundwater data must be used with caution. NOTE: Data were compiled from various sources. This product was developed through digital means and may be updated without notification. No warranty

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