Full-Service Support At Subsurface Engineering D.P.C., we can take care of every step of the design process, from obtaining necessary permits to handling all aspects of the construction itself. Get in touch today for more information. Contact Us Today! Additional Information About Our Services Grading and Drainage Design Grading & Drainage design, including but not limited to residential sites and municipal sites Shallow drainage design systems for areas in high groundwater Cut & Fill Analysis Driveway and roadway design Municipal variances Retaining Wall Design Segmental block walls Cast-in-place reinforced concrete walls Steep embankment stabilization Stormwater Management State Pollutant Discharge Elimination System (SPDES) Stormwater Pollution Prevention Plan (SWPPP) preparation (Standard, Condition Release, and Conditional Release Self-Certification) MS4 acceptance and NYSDEC approval SWPPP Inspections Septic Design (I/A OWTS) Expertise in designing for challenging sites, including but not limited to potable wells, wetlands, unsuitable soils, and high groundwater conditions I/A OWTS Septic Design Sewer connection design Suffolk County Department of Health Services Permitting Nassau County Permitting Approved Design Engineer for the Nassau County S.E.P.T.I.C. program Driveway covenants Inspections for both existing and newly installed septic systems Existing and newly installed septic system certification As-builts Variances Geotechnical Engineering Geotechnical drilling oversight Geotechnical evaluation report preparation for residential and commercial construction in Nassau County, Suffolk County, and New York City. Borings completed in accordance with the ASTM D1586 standards Soils classified in accordance with Unified Soil Classification System (USCS) and/or the NYC Building Code classification Foundation recommendations for non-cohesive and cohesive soils Calculated allowable bearing capacities for each depth sampled Soil preparation recommendations Seismic recommendations Verification of the FEMA Flood Zone with associated flood FIRM map Borings completed for sanitary, drainage, and structural compliance Groundwater monitoring Laboratory analysis Test pit oversight Foundation Pile Design New Construction Additions and renovations Helical piles Timber piles Batter Piles Pile caps Underpinning and foundation remediation Pedestrian bridges, bulkheads, and boat ramps Deadman tie backs FEMA compliance Regulatory Permitting Suffolk County Department of Health Suffolk and Nassau County Municipalities New York State Department of Environmental Conservation (NYSDEC) Request information for additional permitting needs Construction Support & Inspection Services Dewatering permits RFIs Bid services Submittal review Contractor bid review Construction oversight Pile installation certification
