General Construction

The system shall not be installed in wet or frozen soils.

All installation and construction techniques shall conform to state and local codes pertaining to on-site sewage systems and the permit for the site.

Do not park, drive large equipment, or store materials on the dispersal area. No activity should occur on dispersal area other than the minimum required to install the system.

The installation shall be in accordance with specifications and procedures as supplied by the Manufacturer of the equipment.

The contractor shall be certified to install this type of system and should hold a pre-construction meeting with the individuals responsible for the site design and inspections. The meeting should be held prior to the beginning of the site work to ensure protection of the site conditions and to ensure that the system is installed according to design.

If site conditions are determined to require the installation of the system to deviate from the design plans, all work shall stop immediately and the Designer and Health Agent shall be notified. Any ongoing work shall be the sole responsibility of the contractor.

All drip tubing is to be installed parallel with the contour.

When installing drip tubing in natural soils, the tubing may be installed with a vibratory plow, a static plow, a narrow trencher (<6” width), or by hand trenching. Vegetative cover must be re-placed for installations where it is removed or buried during installation.

When fill is to be brought in, the installation takes place by scarifying the surface and bedding the drip tubing in clean sand, meeting requirements for fill material in Title 5 at 310 CMR 15.255(3) with cover consisting of sand and topsoil meeting the design requirement. Vegetative cover must be replaced for installations where it is removed or buried during installation.

Typical cover requirements range from 6”-12” but the designer may indicate the tubing to be installed up to 24” below grade.

All cutting of rigid PVC pipe, flexible PVC and drip tubing of size 1 1/2” or smaller shall be accomplished with pipe cutters approved by Manufacturer. No sawing of PVC, flexible PVC or drip tubing of size 1 1/2” or smaller is allowed. All rigid PVC pipe, flexible PVC and drip tubing in the work area shall have the ends covered with duct tape after cutting to prevent construction debris from entering the pipe. Prior to gluing, all joints shall be inspected for and cleaned of any debris. All PVC pipe and fittings in the field shall be SCH 40. All glued joints shall be cleaned and primed with PVC primer prior to being glued. All force mains shall be tested for leaks prior to being backfilled by pressurizing the system and observing for leakage.

The Hydraulic Unit is to be placed on a bed of 4” - 6” thick 3/4” - 1 -1/2” gravel for drainage. If standing groundwater is a problem in the vicinity of the Hydraulic Unit, a screened drain to daylight is required.