Civil Engineering The civil engineers at Coastal Systems International, Inc. specialize in coastal/waterfront projects and have extensive experience in marina utilities and shore support. Coastal Systems prepares and processes site designs for services including paving, grading, stormwater management, and sanitary sewer collection, as well as fire, gray, and potable water distribution. The design submissions are monitored as they are processed by city, county, and state agencies. Coastal Systems has retained several unique utility designs for reverse osmosis, water treatment/distribution, sewage treatment and collection, electrical generation, solid waste handling, and fuel systems management for use in private island destinations.