2.3.3 Elevated Sand Mounds (Title 25. Environmental Protection, Chapter 73, Section 73.55)
 The Most Typical On-lot System in the Poconos- Often Known as the Turkey Mound. Note that the downgradient area acts to increase the actual recharge area for the system. Therefore, the aggregate or gravel zone is less than the actual recharge area. |
System Highlights (General Highlight of Characteristics Required for this System- It is critical that
you review the PADEP regulations and any local agency regulations regarding the siting and use of
this system. In general, these systems have found widespread use in
Pennsylvania, because of the presence of fragipans, perched water tables, and
shallow depths to bedrock and high permeability materials. These systems can be used when:
1. The depth to the limiting zone occurs at less 20 inches to less than 60
inches below the mineral soil
surface. The system then requires that approved sand be used to create a
minimum of 4 feet of satisfactory material between the bottom of the aggregate
and the top of the limiting zone, but a 1 foot minimum of sand is required in
all elevated sand mound systems.
2.Maximum Slope of undisturbed soil is < 12%, but over 8% the disposal bed would
have to meet specific requirements. At over 8% slope, the absorption area
shall have a minimum length to width ratio of 4 to 1 with the long axis
perpendicular to the slope and upon completion the outside slope of the berm may
be no greater than 33.3%.
3.The average percolation rate, as determined, by conventional test, see Section
73.15, yields a percolation rate of 3 to 180 min/inch.
4.The sand will be placed from the upslope side of the bed using lightweight
equipment, the slope of the sand not directly beneath the aggregate area shall
be approximately 50%, and the top of the sand directly beneath the aggregate
shall be level to a tolerance of +2 inches per 100 feet. The bed
should be surrounded by suitable berm material and the width of this berm shall
be a minimum of 3 feet at the top of the aggregate.
5.Regarding construction, the system design will meet Section 73.53
(beds) with exceptions and additional specifications.
For more details, see Chapter 73, Section 73.55. For large volume disposal beds, there is a special requirements, see Alternative Systems Section.
To obtain more information about the company and its services,
please E-mail: B.F. Environmental.
It would be appreciated if you would put your name,company name, mailing address, and
phone number in the message.
