Installation Guide

3
1
Determine location to install the Ground Box:
• The location must be in a well drained area, away from inlets and outfalls.
• Do not install Box at low points or in areas prone to accumulate standing water.
• Do not install Box in locations where it will be subject to deliberate vehicular traffic.
– Box is rated for occasional non-deliberate vehicular traffic with a maximum 5,000 lb (22.2 kN) design load
(ANSI/SCTE 77 Tier 5).
• Box should only be installed in locations where the grade is within 1% of level.
• Box should be installed in sidewalks only where the grade is less than 2% in all directions.
• Box installation in locations where the seasonally high water table is less than 3 feet (600mm) below finished
grade is not recommended.
• Consultation of a licensed professional engineer knowledgeable of local soils is recommended to determine if
unsuitable or poor soils may be encountered at the intended Box location.
• Do not install Box on unsuitable soils.
– Unsuitable soils are those with unsatisfactory drainage characteristics and high volume change potential.
Unsuitable soils are defined herein as USCS soil groups OL, OH, and PT (organic silts, organic clays, and peat).
• Installation of Box on poor soils is not recommended without additional drainage improvements. One method for
improving drainage and minimizing the potential for heave in frost-susceptible and other poor soils is presented in
these instructions (See provisions for additional excavation in Step 2.)
– Poor soils are those with poor drainage characteristics.
– For warm and cold climates, poor soils are defined herein as USCS soil groups ML, MH, CL, and CH (inorganic
silts and inorganic clays). Additionally, for cold climates poor soils include USCS soil groups GC and SC (clayey
gravels and clayey sands).
– Poor soils are not a concern for un-irrigated locations where the average annual precipitation is less than 30
inches (762mm).
• Do not install Box in permafrost areas.
• Box should not be installed in locations where bedrock is less than 3 feet (600mm) below finished grade.
INSTALLATION:
Glossary of Terms:
USCS Unified Soil Classification System
OL Organic silts and organic silty clays of low plasticity
OH Organic clays of medium to high plasticity, organic silts
PT Peat and other highly organic silts
ML Inorganic silts and very fine sands, rock flour, clayey silts or fine sands with slight plasticity
MH Inorganic silts, micaceous or diatomaceous fine sandy or silty soils, elastic silts
CL Inorganic clays of low to medium plasticity, gravely clays, sandy clays, silty clays, lean clays
CH Inorganic clays of high plasticity, fat clays
GC Clayey gravels, gravel-sand-clay mixtures
SC Clayey sands, sand-clay mixtures