Stinson Beach
County Water District

TITLE IV ONSITE WASTEWATER
MANAGEMENT CODE

CHAPTER 4.12 LAND DIVISION STANDARDS

Return to Title IV Table of Contents

Sections:

4.12.010  Requirements
4.12.020  Field Testing
4.12.030  Documentation
4.12.040  Monumentation of Dispersal Area
4.12.050  Certification
4.12.060  Land Division Plan - Tentative Map

4.12.010  Requirements
Requirements for processing information necessary for approval of a septic system for a tentative map or a new subdivision (two or more parcels) shall be the same as the general requirements for wastewater systems. All subdivision submittals shall include a report of localized groundwater mounding and of generalized and localized nitrate accumulations for each parcel and for the subdivision as a whole to insure that no septic system will affect other parcels. No parcels shall cause a nitrate concentration higher than 10 mg/l to any adjoining property.

4.12.020  Field Testing
All soil exploration holes, groundwater determination holes, and percolation test holes shall be clearly identified in the field and on a plan as to hole number and lot number.

4.12.030  Documentation
Percolation test information shall be submitted in a separate format for each proposed lot. The lot-by-lot information may be bound into an overall septic system site assessment for the entire subdivision. The lot-by-lot information shall include percolation tests for that lot using the same numbering as in the field and on a wastewater plan. Soil profiles logs and site plans for each of the proposed sewage treatment areas shall show information as specified in Section 4.07.130.

4.12.040  Monumentation of Dispersal Area
The area tested shall be marked by placing a six foot minimum steel fence post at least four feet into the ground at the two (or more) profile holes for each percolation test site. The fence posts shall be located with distances from at least two prominent, permanent, and readily identifiable property features. Areas tested for sewage treatment shall be delineated on the final map or parcel map. These areas shall be accurately tied to the fence posts marking the leach field area.

4.12.050  Certification
The individual certifying the test shall indicate the boundaries of the acceptable dispersal field site and shall certify that each lot has sufficient area to accommodate dispersal for at least a 1,400 square foot home, plus a 100% built secondary area, and a 100% fail safe area.

4.12.060  Land Division Plan - Tentative Map
The plans of the proposed site development shall show all road cuts, driveway cuts, grading, structures, drainages, and drainage improvements along with the dispersal fields. An overall map of the subdivision shall be submitted with submittal of the percolation test data. This map shall clearly indicate location of field tests, proposed building site, proposed individual or mutual lot configuration, and all proposed and existing improvements. All items listed as requiring setbacks in this code shall be shown on this plan.