Our Services Acorn provides a specific niche of environmental services related to natural resources management. Click on a link below for more details. Wetland Services NEPA Documents EAW Tree Surveys Listed (Endangered) Species Studies Environmental Site Assessments Environmental Permitting Erosion Control Planting Design Hydrology Monitoring Studies Sub meter GPS Mapping Geographical Information Systems GIS CADD Drawings Water Chemistry Studies Seeding and Planting Sites