Gravel, Fill and Soil Delivery in Lehigh Acres, FL

Wet fine sand over Tamiami limestone

The USDA soil survey maps Brynwood fine sand, wet-Urban land complex, 0 to 2 percent slopes, at the ZIP's center point. The Brynwood series makes up 45 percent of the map unit, and the word wet in the name points to a water table that rises close to the surface for part of the year.^[1]

The survey counts 33 percent of the map unit as urban land, paved or built over. The remaining share is open sandy ground between roads, roofs and slabs, and it takes the runoff from the paved part as well as the rain that falls on it.^[1]

The top mineral layer is fine sand. The survey rates the Brynwood soil poorly drained and gives it hydrologic group B/D, meaning it acts like a group D soil while the water table is high and like a group B soil where it has been drained. Sand normally lets water through quickly, but when the water table sits near the top there is no room left for rain to go, so puddles linger.^[1]

The survey records lithic bedrock at about 12 inches. Hard rock that close to the surface limits how deep a post hole, a pipe trench or a tree root can go. Shrink-swell is rated low, at 0 percent, so the sand itself does not heave or crack as it wets and dries.^[1]

The geologic map places the Tamiami Formation at the ZIP's center point, a unit made of sand, limestone and clay from the Late Pliocene. That limestone is the hard layer a digger meets below the sand. It can be soft enough to chip in places and hard enough to stop a shovel cold in others, and it sometimes holds pockets of clay that slow drainage even further.^[2]

For a project, the shallow rock means building up rather than digging down. Raising a drive, a pad or a bed above the surrounding sand keeps it out of standing water, and it avoids a fight with the stone below.^[1],[2]

The ground at the center point stands 20 feet above sea level.^[3]

A raised drive for flat, wet ground

Begin by clearing grass and roots and grading the sand into a gentle crown. On ground that holds water near the surface, height is the best defense. Bring in Fill Dirt or Fill Sand to lift the driveway footprint above the yard around it, and compact it in layers with a plate compactor, wetting each layer lightly so the sand packs.^[1]

Lay fabric over the raised fill so fine sand does not drift up into the stone. Build the base with Road Base in thin, rolled lifts. Crushed Concrete makes a solid alternative and packs just as firm. For the surface, #57 Crushed Stone drains fast and gives good traction, while 3/4" Crushed Stone or Driveway Gravel locks a little tighter. Asphalt Millings make a dark surface that firms up in the sun. With 53.4 inches of yearly precipitation at the station, a swale of Drain Rock or River Rock along each side carries storm water toward the road.^[1],[4]

Heavy rain and no freeze

Weather averages come from the NOAA normals station at FT Myers SW FL RGNL AP, FL, about 10 miles away. It averages 53.4 inches of precipitation a year, a heavy total that arrives in strong bursts. On poorly drained sand, the real question for any project is how fast that water can get off the surface.^[4]

The station records 0 days a year with a low of 32 F or colder. Freeze damage does not shape the design of a drive or a patio. Gravel, pavers and beds can go in during any month when the ground is dry enough to work.^[4]

Beds, lawns and edges on sandy ground

Fine sand holds few nutrients, and wet sand can drown roots. Raised beds filled with Garden Soil, or Topsoil blended with Compost, keep roots above the high water and give them something to feed on. Topdressing a thin lawn with Topsoil mixed with Compost builds up the surface slowly and helps grass hold through wet weeks.^[1]

Mulch slows the splash of heavy rain and keeps sand from washing out of a bed. Brown Shredded Mulch, Black Shredded Mulch, Red Mulch and Wood Chips all work, and a thick layer stays put better than a thin one. A border of River Rock or Pea Gravel along the drip line of a roof catches the stream from the eaves so it does not carve a trench in the sand. Playground Sand spread under a swing set gives a soft landing that drains fast after a storm.^[1],[4]

#57 Crushed Stone or Asphalt Millings for a drive

Two surfaces suit a raised drive on wet, sandy ground, and they behave in opposite ways. #57 Crushed Stone is clean, angular stone with few fines. Rain passes straight through it into the base and the fill below, so the surface rarely holds a puddle even after a hard storm. That openness is welcome where the station averages 53.4 inches of precipitation a year. The stone stays loose on top, so it can shift under tight turns and may need a fresh layer raked in every few seasons.^[1],[4]

Asphalt Millings are ground-up old pavement, a mix of stone and old binder. Laid over a compacted base and rolled, they knit together as the sun warms them and form a dark, firm surface that sheds water toward the edges rather than taking it in. They scatter less than loose stone and handle turning wheels well. The trade-off is drainage. Because water runs off rather than through, a millings drive on poorly drained sand must have a clear crown and a swale of Drain Rock or River Rock on each side to catch the runoff. Many owners pick #57 Crushed Stone for long drives where water must soak in along the way and Asphalt Millings for short drives and parking pads where a firmer, cleaner surface matters more. Either one needs the same raised, compacted base and a layer of fabric over the fill.^[1]

Homes in ZIP 33936 and the FDOT base spec

Census counts show 10,913 housing units in ZIP 33936. Lehigh Acres as a whole holds 42,286 units.^[5]

Detached single-family houses make up 73 percent of homes in ZIP 33936, compared with 82 percent across Lehigh Acres.^[5]

The median home in ZIP 33936 dates to 1979, while the Lehigh Acres median is 2003. Owners occupy 72 percent of the occupied homes in the ZIP.^[5]

The Florida Department of Transportation sets its base standard as Graded Aggregate Base, Section 204, in the Standard Specifications for Road and Bridge Construction. It describes the graded stone layer under state roads.^[6]

ZIP 33936 is in Lee County, and Gravel Valet also delivers to Cape Coral and Sarasota.^[6]