Exception. The City engineer may permit placement
of larger rock when the soils/civil engineer requesting such placement
properly devises a method of placement, continuously inspects its
placement, and approves the fill stability. The following conditions
shall also apply:
(1)
Potential rock disposal areas shall be delineated
on the grading plan;
(2)
Rock sizes greater than twelve inches in maximum dimension
shall be ten feet or more below grade measured vertically;
(3)
Rocks shall be placed so as to assure filling of all
voids;
(4)
All fills shall be compacted to a minimum of ninety
percent of maximum density as determined by ASTM D-698-70 and ASHTO
T99. Field density shall be determined in accordance with ASTM D-698-70
or the most recent update thereof, or equivalent as approved by the
City engineer;
(5)
The slope of fill surfaces shall be no steeper than
is safe for the intended use. Fill slopes shall be no steeper than
three horizontal to one vertical.
