DETENTION/RETENTION BASIN NOTES
All grading, trenching and backfill shall be considered "Engineered Grading" and shall conform with the requirements of Chapter 70 of the City of Palmdale Building Code and the following. Reports as specified in Section 7021 shall be filed with the City Engineer.
A. SITE PREPARATION
- The embankment foundation area and reservoir area shall be cleared of all trees, stumps, roots, brush, boulders, sod, and debris.
- All topsoil containing excessive amounts of organic matter shall be removed.
- The foundation for the embankment shall be scarified and approved by the geotechnical engineer and city inspector prior to placement of fill. Loose foundation soils shall be removed to firm soil and recompacted to 90% relative compaction.
B. EMBANKMENT
- The embankment material shall be approved by the geotechnical engineer prior to construction of embankment.
- The material shall be free of all sod, roots, woody vegetation, large rock (exceeding 12 inches in diameter), and other debris.
- Placement of fill material shall be started at the. lowest point of the foundation and shall be placed in 6-inch maximum lifts which are to be continuous over the entire length of the fill and approximately horizontal. Embankment shall be compacted to 90% relative compaction as per ASTM D-1557.
- CITY OF PALMDALE...
BASIN NOTES Std. No.
Approved City Founded Date D-7.1