How are estimated absorption rates determined for soil not listed in Appendix I?

The method for determining estimated absorption rates for soil types not included in Appendix I is established by the Department. This process ensures that the data used for septic system planning and installation conforms to state regulations and standards. The Department utilizes a systematic approach to assess soil characteristics and their ability to absorb effluent, based on scientific understanding and field data. This central authority maintains consistency and reliability in the assessment of soil absorption capabilities across various regions, which is crucial for effective septic system design and function.

Other methods, such as conducting random field tests or gathering information from local contractors, may yield valuable insights but do not provide the standardized and regulated answer that comes from an established authority. Additionally, while historical data can provide context, it may not accurately reflect current soil conditions or meet the necessary regulatory framework for new installations. Thus, reliance on the Department ensures adherence to proper procedures and standards in septic system installations.