Gillespie Field – Runway Object Free Area/Runway Safety Area (ROFA/RSA) Drainage Improvement Project Environmental Assessment

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The proposed undertaking consists of installing approximately 2,300 feet of 42-inch reinforced concrete pipe (RCP) in the location of the existing earthen swale used for stormwater conveyance. The RCP will connect to existing storm drains to the northwest at the intersection of runway 9L-27R and taxiway B and on the southeast end at the intersection of taxiways D and D8 (the infield area north of the intersection of Joe Crosson Drive and Wing Avenue). The RCP would be covered leaving grated openings to capture stormwater flows. The area would be graded to comply with FAA’s engineering design standards for the runway object free area (ROFA)(1.5 – 5 percent grade) and runway safety area (RSA) (0 – 3 percent grade). This undertaking also includes the installation of an additional 800 feet of RCP from approximately the center of the previous mentioned RCP south connecting to an underground detention basin in the proposed El Cajon Development area just south of Joe Crosson Drive. The installation of this RCP would require trenching under runway 9R-27L, taxiway D and an apron to connect to the detention basin. The project includes construction of taxiways S and N to connect the El Cajon 70-acre site and Taxiway D. This includes grading and paving approximately 71,000 square feet (sq. ft.) of an existing unpaved area and removing approximately 67,000 sq.ft. of the existing pavement.

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