Hydroseeding and erosion control in Petersburg

The US Geological Survey names Petersburg as a fall line city, alongside Richmond, Fredericksburg, Alexandria and Emporia, and puts the line itself close to the route of I-95. West of it you are above the Pennsylvanian–Permian Petersburg Granite, on Piedmont ground: low infiltration, fast runoff, and fines that stay suspended long enough to pass straight through a silt fence. East of it the ground becomes unconsolidated Coastal Plain terrace, sandier and droughty, where the failure mode is the seed drying out before it germinates. One city, two problems, two specifications — and a quote that offers the same mulch rate on both sides has not been to the site.

Petersburg also has a provision we have not found anywhere else in the metro. Its erosion and sediment control article states that removing or clearing trees from land zoned commercial, industrial or residential requires approval of a land disturbance permit, with no square footage threshold attached and only selective removal of dead or diseased trees excepted. Our copy of that section is an abstract taken in 2016 rather than the live code, so confirm it before you rely on it — but it is unusual enough that treating a clearing job as automatically unregulated would be a mistake here.

The buffer rule runs the other way from Chesterfield’s. Where Chesterfield publishes plant counts per 400 square feet, Petersburg sets a performance standard: vegetation removed from the 100-foot buffer must be replaced with vegetation equally effective at retarding runoff, preventing erosion and filtering nonpoint source pollution. More flexible, but much harder to cost from a table — which is a reason to get the restoration specified in writing before anything is cleared rather than after someone has already started.