When you’re planning a new development, building a home, or installing a septic system, understanding your soil is one of the most important steps. Mill Creek Environmental (MCE) offers Level 3 and Level 4 Soil Surveys (often called “perc tests”) and Conceptual Site Plans to help you design a system that works and helps avoid surprises later.
Here’s a breakdown of what these services are, why they matter, and how MCE can help.
What Are Level 3 and Level 4 Soil Surveys?
- Level 3 Soil Survey (Perc Test): Used to determine whether the soil on a lot is suitable for an on-site sewage management (septic) system. It measures how the soil handles wastewater absorption, and checks depth to rock or water table.
- Level 4 Soil Survey: A more intensive investigation required for difficult lots such as lots with challenging terrain, poor soil, high water tables, or shallow bedrock. Level 4 Soil Surveys provide much more detail and are often required where the site conditions are marginal.
In both soil surveys, classifications are made based on how well they absorb and filter wastewater. This helps to determine if a “conventional” septic system is feasible, or whether you’ll need alternatives like mound systems, drip systems, or other engineered solutions.
How Soil Surveys Are Performed
Here are the typical steps MCE follows:
- Hand Augured Borings – We dig borings in key locations where you plan to install a septic system. Each boring is advanced to a depth of six feet where surface condition permit.
- Soil Classification – As the borings are dug, soil types are identified (texture, structure, permeability). Each soil type has an estimated absorption rate which we use in our calculations to size the septic field.
- Site Feature Mapping – We map out site-specific features (slope, wells, springs, creeks), noting any setbacks required by local health or environmental regulations. These features affect where septic systems can be located.
- Analysis & Report – We produce a report that includes data from each boring, classification codes, a map showing the borings and site features, and a summary letter with recommendations. For many residential lots, a Level 3 Soil Analysis can be completed in as little as a week.
What is a Conceptual Site Plan?
A Conceptual Site Plan takes the soil survey results and overlays a preliminary layout of development:
- Where septic systems or drain fields can go safely
- Where buildings, driveways, or other structures should be placed considering slope, soil limitations, and setback requirements
- How to accommodate unusual site features or constraints (steep terrain, shallow bedrock, flood zones)
Conceptual Site Plans help you avoid costly redesigns later. They are especially useful for properties with limited space, difficult soils, or terrain conditions. MCE’s engineers and licensed geologists work together to produce conceptual designs that are feasible, compliant, and optimized for your lot.
Why These Services Matter
- Compliance & Permitting: Local health departments and environmental agencies often require a soil survey and conceptual plan before issuing a building permit or approving development.
- Avoiding Failure: Poor soil conditions or incorrect placement of septic systems can lead to system failure, water contamination, or expensive repairs.
- Maximizing Property Value: A well-designed lot plan makes your property more usable and attractive. Knowing where systems should go helps with construction planning, landscaping, and resale.
- Cost-efficiency: Identifying soil limitations early helps you budget for necessary system upgrades or special designs, rather than discovering problems mid-construction.
Mill Creek Environmental’s Experience & Capabilities
Mill Creek Environmental brings proven expertise to soil surveys and conceptual planning:
- Thousands of Level 3 and Level 4 soil analyses completed for both residential and commercial properties.
- Specialization in difficult soils and terrains: high water tables, shallow bedrock, steep slopes.
- Designs for many kinds of systems: conventional septic, mound or drip systems, land application systems (LAS), large community septic designs, Non-Domestic Septic System Permits (NDSS), and Underground Injection Control (UIC) permits.
- Fast turnarounds: many residential Level 3 Soil Surveys can be completed in one to two weeks, and we will expedite when possible.
When You Need a Level 3 or Level 4 Soil Survey & Conceptual Plan
You should consider these services if:
- You’re planning on installing a septic system
- Due Diligence when purchasing a property.
- The site has poor soil, shallow bedrock, or a high-water table
- Building on a steep grade or unusual terrain
- Local health or environmental authorities require detailed soil and site layout data before permitting
- You want to avoid surprises and keep your project timeline on track
If you’re preparing to build, subdivide land, or install a septic system in Georgia, reach out to Mill Creek Environmental. We deliver soil surveys, septic designs, and conceptual site plans that are accurate, practical, and aligned with regulatory requirements.
For details and to get a site-specific cost estimate: visit our Soil Surveys & Septic Designs page or call 706-579-1607.
