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IML <br />Exhibits 4.1 through 4.4 present a detailed look at the drainage infrastructures <br />throughout the site at the existing conditions. <br />Exhibit 5 presents the existing on -site drainage ditches. <br />Existing Outfalls <br />There are total of 15 drainage structures from the La Porte Municipal Airport site <br />along Spencer Highway. Based on the survey data, we assume these drainage <br />structures are connected the storm sewer system at Spencer Highway. This storm <br />sewer line ranges in size from 48-inch RCP to 10 x 6 feet concrete box culvert, and <br />ultimately outfalls into the Big Island Slough to the west of the airport property. <br />Existing Pipelines and Utilities <br />Based on the available public record from Texas Railroad Commission, there are <br />three pipelines that exist on the La Porte Municipal Airport site. Two lines are <br />designated as `in service', a propane pipeline owned by Exxon Mobile and a crude oil <br />pipeline owned by Enterprise Crude Pipeline LLC. The third line is designated as <br />`abandoned' crude oil pipeline owned by Exxon Mobile. There are also several <br />petroleum products pipelines located just to the east of the airport site. Figure 6 <br />presents the location of the pipelines on and near the airport site. The pipelines <br />running at the middle of the airport property are identified as located within the <br />pipeline corridor as shown on the most recent Airport Layout Plan (ALP). <br />Page 116 <br />