§ 13.04.070. Construction standards.

A.

The septic tank shall be of two-compartment construction and shall be of the size and type constructed in accordance with the requirements outlined in Chapter 5.1 of the on-site manual.

1.

The minimum liquid capacity of new septic tanks shall be one thousand five hundred (1,500) gallons. Lesser capacities may be authorized by the on-site sanitary official for auxiliary septic tanks.

2.

The septic tank shall be constructed of concrete or equally durable material satisfactory to the on-site sanitary official.

B.

Dispersal Field/Effluent Disposal. The effluent from a septic tank or an approved alternative treatment system shall be discharged into a dispersal field or an approved alternative disposal system of the size and type constructed in accordance with the requirements of the on-site manual as administered by the on-site sanitary official.

C.

Volume and Soil Criteria.

1.

When a project has an average daily sewage flow in excess of one thousand (1,000) gallons per day, one hundred (100) percent of the original and replacement dispersal field shall be installed along with accessible diverter value.

2.

Permeable soil depth below the bottom of the leaching trench that receives non-secondary treated septic tank effluent shall not be less than four (4) feet.

3.

Depth to seasonally high groundwater below the bottom of the leaching trench that receives non-secondary treated septic tank effluent shall not be less than four (4) feet.

4.

Ground slope in the disposal area shall not be greater than thirty (30) percent.

5.

When a project involving the new construction of or alteration to the primary dispersal field has an average daily sewage flow of less than one thousand (1,000) gallons per day and is to be served by a septic tank/dispersal field system, there shall be suitable area available upon the subject property for the installation of the primary dispersal field and a one hundred (100) percent replacement area for a secondary dispersal field system.

6.

Soil composition shall be such that it will serve as an effective filter for septic tank (or an approved alternative treatment system) effluent.

7.

Individual leach fields shall not be excavated when the soil is wet enough to compact or smear easily.

8.

Any soil testing performed pursuant to meeting the above criteria may, at the discretion of the on-site sanitary official, be witnessed by a representative from the town on-site sanitation division.

9.

Wastewater effluent dispersal is not allowed in any areas that will receive vehicle loading, stationary or moving, whether the surface is asphalt, concrete, gravel or soil, which has a percolation rate greater than thirty (30) minutes per inch. Paved areas, or areas proposed to be paved, which exceed thirty (30) minutes per inch of percolation rate shall not be used to determine net lot area when new parcels are being created.

(Ord. No. 559, § 3, 3-8-2016; Ord. No. 429, § 2, 3, 11-9-2004; Ord. No. 425 §§ 1, 2, 2004; Ord. 343 § 1, 2000; Ord. 228 § 3(part), 1993; Ord. 219 § 2(part), 1992)