D'Appolonia is a client-focused provider of consulting engineering services. Since the founding of the firm in 1956, we have provided engineering, scientific and construction-related services to industrial and governmental clients in the U.S. and in many foreign countries. Our core capabilities include civil, geotechnical, and environmental engineering; geology and geophysics; and hydrology and hydraulics. These capabilities have been applied to a wide range of project types, as described below.

Employment Opportunities

D'Appolonia is currently seeking qualified engineers for employment based in our Monroeville, Pennsylvania office. Our current position openings can be found at this link.

Traditional Service Areas

D'Appolonia provides a broad spectrum of technical services. Our primary service areas include the following:


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Marcellus Shale Engineering Services

Gas well drilling and development is a new and rapidly growing business in northern Appalachia. D'Appolonia is providing engineering support services for site development and grading, permitting, and evaluation of environmental issues for gas well drilling sites, as well as other specialized services such as determinination of undermining and evaluation of mine subsidence potential, foundation design, impoundment design, pipeline layout, environmental compliance monitoring, and construction monitoring. The links below provide a description of the Marcellus Shale Formation and its current state of development and engineering services that D'Appolonia provides to the gas well drilling and development industry.

MSHA Engineering and Design Manual

A team of engineers and scientists led by D'Appolonia completed an update of the Mine Safety and Health Administration (MSHA) Engineering and Design Manual in 2009. Additional discussion about the new Manual and a link to the on-line version of the Manual at the MSHA web site can be found by clicking on the Manual cover in the lower right corner of the photograph matrix above.


site exploration, subsurface exploration, tunnels, soil slopes, rock embankments, alternatives evaluation, value engineering, value engineering studies, bridge piers, bridge pier foundations, highway cuts and fills, cut and cover, braced excavations, anchored retaining walls, geosynthetics, design review, constructability evaluation, retaining wlls, cuverts, stream bank stabilization, loess bluffs, soil nails micropiles, MSE walls, mechanically stabilized earth walls, RSS, reinforced soil slopes, roadway design, soldier beams, lagging, tangent caisson walls, soil mixing, foundation improvement site reconnaissance, site exploration, demolition, demolition plans, stormwater management, storm water management, hydrology, design basis flood, hydraulics, hydraulic engineering, channel flow, flood studies, erosion and sedimentation control, erosion and sedimentation control plans, site layout, site grading, site grading plan, grading plan, cut and fill, balanced cut and fill, grading plan preparation, roadways, roadway design, parking lots, parking lot design, site utilities, site utility design, water, sewer, electrical, electric, permitting, regulatory approval, regulatory interaction, cost estimation, cost development, scheduling, schedule preparation, bid package preparation, contractor selection, bid evaluation, funding assistance siting studies, seismic design criteria, foundation design, waste facility design, flyash, remedial design, nuclear power plants, cogeneration plants, regional geology, local geology, seismology, underpinning, equipment foundations, scrubber residue, aqueous wastes, tailings slurry, permitting, foundation design, equipment foundations, turbine foundations, driven piles, drilled shafts, micropiles, Operating Basis Earthquake, OBE, Safe Shutdown Earthquake, SSE, Probable Maximum Flood, PMF, OEMs, Dynamic Power Technology, DPT, IPPs, Independent Power Producers, power industry foundation design, soil nails, soil-nailed slopes, soil-nailed 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bridges, highway bridges, driven piles, drilled shafts, retaining walls, piers, abutments, GPR, flyash codisposal, geophysics Marcellus Shale, gas well drilling, engineering support, lateral drilling, site exploration, permitting, foundations, pipeline layout, environmental compliance monitoring, site development, site grading, gas monitoring, hydraulic fracturing, propping, proppant, natural gas, construction monitoring, well siting, site development, grading design, foundation design, Pennsylvania regulations, cut and fill, drilling pad, access roads, fill compaction, drainage, impoundments, hydraulic structures, frac, frac-water, site reconnaissance, PA Code Chapter 78.56, undermining, mine subsidence, liners, impoundment liner