Parking Lot Maintenance Industry Terminology
ADA Compliance
Meeting Americans with Disabilities Act requirements for accessible routes, slopes, curb ramps, stall sizes, signage, and detectable warnings in parking facilities.
Examples: “Verify the new accessible route has a maximum 2% cross-slope.” “Re-stripe to add a van-accessible stall with an 8 ft access aisle.” “Install truncated domes at the curb ramp per ADA.”
Aggregate Base
A compacted layer of crushed stone or gravel placed on the subgrade to support the pavement structure and distribute loads.
Examples: “Proof-roll the aggregate base to identify any pumping areas.” “We need 6 inches of Class 5 base over the subgrade.” “Add geotextile under the base to prevent fines migration.”
Alligator Cracking
Fatigue cracking that forms interconnected blocks resembling an alligator’s skin, typically indicating structural failure of the pavement and/or base.
Examples: “The drive lanes show extensive alligator cracking—recommend full-depth patching.” “Sealcoat won’t fix fatigue cracking.” “The cracking pattern indicates base failure.”
Asphalt Binder
The bituminous component that binds aggregate together in asphalt concrete; specified by performance grade (PG) and properties like viscosity, temperature susceptibility, and modification.
Examples: “Specify PG 64-22 binder in the mix design.” “Binder content is too low; that’s why it’s raveling.” “Use polymer-modified binder for added rut resistance.”
Best Management Practices (BMP)
Proven methods and controls to minimize environmental impacts, especially sediment and pollutant discharge to stormwater, during maintenance and construction.
Examples: “Install inlet protection and silt fence before milling.” “Use street sweeping as a BMP to reduce pollutant load.” “Cover stockpiles per the SWPPP.”
Bid Bond
A surety instrument guaranteeing the bidder will enter the contract and provide required performance and payment bonds if awarded the project.
Examples: “The RFP requires a 10% bid bond.” “Without the bid bond, the proposal is nonresponsive.” “The surety will issue our bid bond by Friday.”
Catch Basin
A stormwater structure with a grate or curb opening and a sump that captures runoff and sediment, conveying flow into the storm drain system.
Examples: “Reset the catch basin ring to match the new overlay.” “Clean the sump to improve drainage.” “Add a curb inlet to reduce ponding.”
Change Order
A formal modification to the contract’s scope, price, and/or time after award, documenting agreed changes or unforeseen conditions.
Examples: “Unforeseen subgrade failure requires a change order.” “CO #3 adds two days and $8,500.” “Get owner approval before extra work.”
Coal Tar Sealer
A sealcoat made from refined coal tar with high PAH content; durable but increasingly restricted or banned due to environmental and health concerns.
Examples: “Coal tar sealers are banned in this city; use asphalt-emulsion.” “Concerns about PAHs drove the regulation.” “Switch to acrylic if chemical resistance is needed.”
Crack Sealing
Treating active, working cracks with hot-pour rubberized sealant (often after routing) to prevent water infiltration and slow deterioration.
Examples: “Route-and-seal the working transverse cracks.” “Hot-applied rubberized sealant meets ASTM D6690.” “Crack sealing extends service life ahead of an overlay.”
Drainage Slope
The cross-slope or longitudinal grade designed to move water off the pavement surface and away from structures to reduce ponding and infiltration.
Examples: “Set cross-slope at 1.5% to shed water.” “ADA route cross-slope must not exceed 2%.” “Mill-to-match to improve longitudinal drainage.”
Engineer's Estimate
A pre-bid cost estimate prepared by or for the owner to budget, compare bids, and evaluate reasonableness of pricing.
Examples: “Our bid is within 3% of the engineer’s estimate.” “Use the estimate to set the project budget.” “It’s the baseline for evaluating unit prices.”
Erosion Control
Measures that prevent soil displacement and sediment transport, including stabilization, silt fencing, inlet protection, and perimeter controls.
Examples: “Stabilize disturbed soil within 14 days.” “Use wattles on the slope behind the lot.” “Repair undercutting near the outfall.”
Fog Seal
A light application of diluted asphalt emulsion sprayed on aging asphalt to seal surface voids, darken the surface, and reduce raveling.
Examples: “Apply a light fog seal to lock in fines.” “No striping for 24 hours after fog seal.” “Fog seals can reduce raveling on aged pavements.”
Full-Depth Reclamation (FDR)
A rehabilitation method that pulverizes the existing asphalt and base, mixes with a stabilizer if needed, regrades, and compacts to create a new stabilized base.
Examples: “Pulverize the asphalt and base to 8 inches.” “Add 2% cement to stabilize the FDR layer.” “FDR corrects base failures cost-effectively.”
Geotextile Fabric
A permeable synthetic fabric used for separation, drainage, filtration, or reinforcement in the pavement structure.
Examples: “Place a separation geotextile over the subgrade.” “Use paving fabric as a stress-absorbing interlayer.” “Ensure overlap per manufacturer’s specs.”
Ground-Penetrating Radar (GPR)
A non-destructive method using electromagnetic waves to image subsurface features like asphalt and base thickness, voids, and utilities.
Examples: “Use GPR to map pavement thickness variations.” “GPR found voids around the catch basin.” “Combine GPR with cores for calibration.”
Hot Mix Asphalt (HMA)
Asphalt concrete produced at elevated temperatures and placed hot; specified by gradation, binder grade, and volumetrics to meet performance targets.
Examples: “Place 1.5 inches of HMA surface course.” “The mix design is a 9.5 mm nominal size.” “Compact to 92–96% of Gmm.”
Infrared Repair
A process that heats existing asphalt with infrared panels, scarifies, blends with fresh mix/rejuvenator, and compacts to create a seamless patch.
Examples: “Use infrared to heat-blend the pothole area.” “Add rejuvenator and fresh mix, then re-compact.” “Infrared can fix birdbaths in small areas.”
Infiltration Rate
The speed at which water enters soil or permeable pavement, critical to drainage performance and porous systems.
Examples: “Test the porous asphalt infiltration per ASTM C1701.” “Sediment reduced the rate—schedule vacuum sweeping.” “Design requires 100 in/hr minimum.”
Joint Sealant
Material placed in pavement or concrete slab joints to prevent water and debris intrusion and to accommodate movement.
Examples: “Seal the concrete joints to prevent water intrusion.” “Use silicone on PCC saw cuts; hot-pour on AC joints.” “Replace failed backer rod.”
KPI (Key Performance Indicator)
Quantifiable metrics used to gauge project, crew, or company performance against goals for schedule, quality, safety, or customer satisfaction.
Examples: “On-time completion is our primary KPI.” “Track call-back rate after sealcoat.” “Monitor safety KPIs like TRIR.”
Lead Time
The time between ordering materials/equipment or scheduling labor and their availability for use on the project.
Examples: “Thermoplastic has a 3-week lead time.” “Order wheel stops now to avoid delays.” “Crew availability is pushing lead time to June.”
Line Striping
Application of pavement markings—stalls, arrows, symbols, and words—using paint, thermoplastic, or other materials for traffic control and compliance.
Examples: “Lay out to maximize stall count within code.” “Use Type II glass beads for retroreflectivity.” “Re-stripe 24 hours after sealcoat cure.”
Milling
Cold planing to remove a controlled thickness of asphalt to correct grade, improve ride, or prepare for overlays and patches.
Examples: “Mill 1.5 inches and place a 2-inch overlay.” “Feather mill at tie-ins to curb.” “Control milling speed to protect base.”
Mobilization
The effort and cost to move crews, materials, and equipment to the site and prepare for work, including setup and demobilization.
Examples: “Mobilization covers moving equipment and traffic control setup.” “A second mobilization is needed for the east lot.” “Mobilization is paid lump sum.”
NPDES Permit
National Pollutant Discharge Elimination System authorization governing stormwater discharges from construction/industrial activities to waters of the U.S.
Examples: “File the Notice of Intent for NPDES coverage.” “Our work drains to an MS4—follow permit BMPs.” “Weekly inspections are required under NPDES.”
Non-Destructive Testing (NDT)
Evaluation methods that assess pavement condition or structure without coring or damaging the facility (e.g., GPR, FWD, infrared).
Examples: “Use FWD and GPR for NDT before designing rehab.” “NDT helps target where to core.” “Infrared thermography located delaminations.”
Oil Spot Primer
A specialized primer applied to petroleum-contaminated pavement to promote adhesion of sealers or coatings.
Examples: “Prime oil-stained areas before sealcoat.” “Use an oil-bonding primer on dripped stalls.” “Reject heavily contaminated spots if not primeable.”
Overlay
A new asphalt layer placed over existing pavement to restore smoothness and extend service life; may follow repairs and tack coat.
Examples: “Place a 1.5-inch overlay after milling.” “Use leveling course to correct birdbaths.” “Check curb reveal post-overlay.”
Pavement Condition Index (PCI)
A standardized 0–100 rating of pavement condition based on type/severity/extent of distresses, used for planning and budgeting.
Examples: “The lot averages PCI 58—fair condition.” “Use PCI to prioritize which sections to patch.” “ASTM D6433 surveys inform the capital plan.”
Patching
Local repair of distressed pavement, ranging from skin patches to partial- and full-depth removal and replacement of failed areas.
Examples: “Saw-cut and full-depth patch the failed panel.” “Skin patch is temporary; schedule FDR later.” “Compact patches to target density.”
Preventive Maintenance
Cost-effective treatments applied to sound or fair pavements to slow deterioration and extend service life before major rehabilitation is needed.
Examples: “Crack seal and sealcoat now to defer an overlay.” “Microsurface before rutting develops.” “Plan PM on a 3–5 year cycle.”
QA/QC (Quality Assurance/Quality Control)
Processes and tests ensuring materials and workmanship meet specifications (QC by the contractor; QA by owner/third party).
Examples: “QC checks include mix temperature and density.” “QA will verify striping thickness and bead rate.” “Document QA/QC in daily reports.”
Raveling
The progressive loss of aggregate particles from the pavement surface due to binder aging, inadequate compaction, or poor mix quality.
Examples: “Aggregate loss on the surface indicates raveling.” “A fog seal can mitigate early-stage raveling.” “Traffic and oxidation accelerated raveling.”
Rejuvenator
A chemical agent that restores lost maltenes and flexibility to aged asphalt binders, applied topically or mixed with asphalt.
Examples: “Spray-applied rejuvenator restored flexibility.” “Add a rejuvenator during RAP recycling.” “Follow cure time before reopening.”
Sealcoat
A protective, thin coating (often asphalt emulsion or acrylic) applied to asphalt surfaces to protect against oxidation, moisture, and UV while improving appearance.
Examples: “Two coats at 0.12 gal/sy each.” “No traffic until sealcoat cures matte.” “Use asphalt-emulsion per local VOC limits.”
Slurry Seal
A cold-applied mixture of asphalt emulsion, fine aggregate, water, and additives used to seal and improve surface texture.
Examples: “Type II slurry for parking areas.” “Cure is slower than microsurfacing.” “Adjust mix water for set time.”
Subgrade
The native soil or improved subsoil beneath the base; its strength, moisture, and compaction control pavement performance.
Examples: “Proof-roll the subgrade to identify soft spots.” “Achieve 95% compaction per Proctor.” “High PI clay subgrade needs stabilization.”
Stormwater Pollution Prevention Plan (SWPPP)
A site-specific plan required under NPDES that outlines erosion/sediment controls, BMPs, inspections, and housekeeping to prevent polluted runoff.
Examples: “Update the SWPPP map as phases change.” “Log inspections weekly and after rain events.” “Store liquids in secondary containment per SWPPP.”
Tack Coat
A light application of asphalt emulsion that creates a bond between existing surfaces and new asphalt layers or patches.
Examples: “Apply 0.06 gal/sy residual between lifts.” “No tracking tack into ADA routes.” “Uniform tack ensures overlay bond.”
Thermoplastic Markings
Durable pavement markings applied hot that bond to the surface and provide long-lasting visibility, often with embedded glass beads.
Examples: “Use preformed thermoplastic for symbols.” “Apply glass beads for retroreflectivity.” “Preheat the pavement to spec.”
Utility Locate
The process of identifying and marking underground utilities prior to excavation or staking to prevent strikes and service outages.
Examples: “Call 811 before saw-cutting.” “Verify locates for electric and fiber.” “Hand dig within the tolerance zone.”
UV Degradation
Weathering of asphalt binders and coatings due to ultraviolet radiation, leading to oxidation, brittleness, and color fade.
Examples: “Oxidation and UV made the surface brittle.” “Sealcoating protects against UV.” “Faded striping is a UV indicator.”
Value Engineering
A structured approach to improve function or reduce cost without sacrificing essential performance or quality.
Examples: “Swap to microsurfacing to meet budget.” “Phase work to keep 50% of stalls open.” “Change aggregate source to cut hauling costs.”
VOC (Volatile Organic Compounds)
Organic chemicals that readily evaporate and contribute to smog; regulated in many jurisdictions for coatings, solvents, and fuels.
Examples: “Select low-VOC sealer to meet air regs.” “Check VOC content on the SDS.” “Local rules cap VOCs in coatings.”
Warranty
A contractual guarantee period for performance or workmanship, specifying covered defects, exclusions, and remedy procedures.
Examples: “One-year warranty against material and workmanship defects.” “Excludes damage from snowplows.” “Warranty starts at substantial completion.”
Work Order
A formal authorization to perform specific maintenance tasks, often tied to budget codes, unit prices, and deliverables.
Examples: “Issue a work order for crack sealing of Lot B.” “The WO references unit prices and scope.” “Close out the work order with photos.”
Yield (Material Yield)
The actual coverage rate of a material compared to the theoretical rate, used to verify application quantities and control costs.
Examples: “We covered 0.12 gal/sy—yield matched the plan.” “Low yield suggests under-application.” “Reconcile material tickets to area for yield.”
Zoning Variance
A municipal approval allowing deviation from zoning or site development standards, sometimes needed for layout changes during major lot renovations.
Examples: “Variance approved to reduce required stalls during re-stripe.” “Seek a variance for modified drive-thru stacking.” “Public hearing is needed for the variance.”
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