General Notes - Prinsco HydroStor HS180 Design Manual

12.3 Sediment Row Maintenance
Maintenance of the chamber sediment row is recommended after an average depth of 3" of
sediment has been collected. The most common method for cleaning is done by using a high
pressure water jet and a vacuum truck (JetVac system). The sediment should be directed to the
inlet control structure sump and vacuumed out. The JetVac process shall only be performed on
HydroStor chamber rows that have AASHTO M288 Class 1 woven geotextile over the foundation
stone.

13.0 General Notes

1. The installation of HydroStor chamber systems must be done in accordance with the latest
published HydroStor Installation/Construction Guidelines. Visit Prinsco's website,
www.prinsco.com, for the most up to date installation guidelines.
2. Prinsco offers installation consultations to installing contractors. Contact your local Prinsco
representative a minimum of 30 days prior to system installation to arrange a pre-installation
consultation. Prinsco representatives are able to answer questions or address comments about
the HydroStor chamber systems and explain the minimum installation requirements prior to
the system being installed. Call 1-800-992-1725 to speak to a local Prinsco representative.
3. The minimum cover height is 18" for HydroStor HS75 chambers and 23.5" for HS180 chambers.
The minimum cover height is measured from the top of the chambers to the bottom of the
pavement (asphalt, concrete, etc.) For installations without pavement, where rutting from
vehicles may occur, the minimum cover height should be increased to 24" for the HS75
chambers and 30" for the HS180 chambers.
4. The maximum cover height for HS75 & HS180 chambers is 8' measured from the top of the
chambers to the top of the pavement.
5. It is the contractor's responsibility to report any discrepancies with the bearing capacity of the
subgrade materials to the design engineer.
6. AASHTO M288 Class 2 non-woven geotextile must be used for the separation layer as indicated
on the project plans.
7. Stone placement between chamber rows and around the perimeter of the chambers must
follow the instructions indicated in the most recent HydroStor Installation/Construction
Guidelines.
8. Backfilling over the chambers must follow the requirements indicated in the most recent
HydroStor Installation/Construction Guidelines.
9. The contractor must refer to the most recent HydroStor Installation/Construction guidelines
for a Table of Acceptable Vehicle Loads at various depths of cover. It is the contractor's
responsibility to ensure that vehicles exceeding those listed in the table do not travel over the
chambers. The use of temporary fencing, warning tape, and/or signs are commonly used
methods to keep oversized vehicles out of the construction zone.
10. The contractor must apply erosion and sediment control measures to protect the chamber
system during all phases of site construction based on the local codes and design engineer's
requirements.
11. HydroStor chambers are covered under Prinsco's Limited Warranty – Terms & Conditions.
Contact your local Prinsco Representative for more information.
Page 33 ©2015 Prinsco, Inc | 800.992.1725 | www.prinsco.com
Design Guide
05/15