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MAA/BWI Subsurface Utility Designating, Locating and Plotting

A. Morton Thomas and Associates, Inc. provided utility locating, designating and plotting services at BWI and Martin State Airports on an as-needed basis. Services included determining the location of all existing underground and above ground utilities within the limits of MAA construction projects; and providing services to determine how these existing utilities would be impacted by proposed projects including all necessary test holes, research, field investigations, plotting, design analysis, and recommendations relative to impacts on existing or proposed utility systems. All project services were performed in accordance with the Standards Guideline for the Collection and Depiction of Existing Subsurface Utility Data, American Society of Civil Engineers, 2003 (CI/ASCE 38-02).

Task assignments have included:

BWI Outbound Roadway Repairs Subsurface Utility Designating, Locating and Plotting Services:AMT provided Utility Designation (Quality Level B) services including marking and identifying known underground utilities, as shown on MAA's plan sheets, and providing a utility sweep for unknown utilities within 25 foot radius of eight (8) staked boring locations and two (2) concrete coring locations. Boring and core locations were staked in the field by the client. Conductive utilities were marked utilizing geophysical prospecting techniques in conjunction with radio, audio and electromagnetic equipment. A utility sweep was performed to identify any unknown conductive utilities. Non-conductive utilities were marked utilizing above ground features, utility plats and/or as built and recollections. Utilities were marked utilizing standard marking paint and/or flags in accordance with APWA standard code to ensure accuracy in the collection of the information. Basic Maintenance of Traffic (MOT) was provided including cones and signs as needed. Deliverables included QL-B field marking of utilities.

BWI Airfield Pavement Rehabilitation Subsurface Utility Designating, Locating and Plotting Services: AMT provided Utility Designation (Quality Level B) including marking and identifying known underground utilities, and providing a utility sweep for unknown utilities within 25 foot radius of fifty two (52) staked boring locations. Boring locations were staked in the field by the client. Conductive utilities were marked utilizing geophysical prospecting techniques in conjunction with radio, audio and electromagnetic equipment. A utility sweep was performed to identify any unknown conductive utilities. Non-conductive utilities were marked utilizing above ground features, utility plats and/or as built and recollections. Utilities were marked utilizing standard marking paint and/or flags in accordance with APWA standard code to ensure accuracy in the collection of the information. Basic Maintenance of Traffic (MOT) was provided including cones and signs as needed. Deliverables included QL-B field marking of utilities.

Martin State Airport Taxiway F Pavement Improvement: AMT provided Utility Designation (Quality Level B) including marking and identifying known underground utilities that are provided on utility plans or verbal recollections, and provided a utility sweep for unknown utilities at Martin State Airport in the area (40 acre site) outlined on drawing provided by client. Conductive utilities were marked utilizing geophysical prospecting techniques in conjunction with radio, audio and electromagnetic equipment. A utility sweep was performed to identify any unknown conductive utilities. Non conductive utilities were marked utilizing above ground features, professional judgment, utility plats and/or as built and recollections. The collection process (survey) of utility field markings was performed by AMT. Utilities were marked utilizing standard marking paint and/or flags in accordance with APWA standard code to ensure accuracy in the collection of the information. Basic Maintenance of Traffic (MOT) was provided including cones and signs as needed. An Electronic CAD file and hard copy of the utility designation marks and surveyed utility features were provided to the client as the deliverable.

Additionally AMT provided Utility Locating (Quality Level A) Test Holes. These services included notifying Miss Utility 48 hours in advance of excavation; and performing test holes at designated areas provided on plan sheets in (Area A) by the client. Vacuum Excavation was utilized to expose utilities to minimize any potential for damage. Test holes performed were of minimum size (usually 1' by 1'). Three swing ties from visible benchmarks and/or features provided with topographic plan sheets were used to provide horizontal location. Vertical location was provided by utility cover (ground surface to top of utility). All utility attributes were documented on a test hole report. Backfill of test holes was performed utilizing material removed, if suitable.

Areas were returned back as close as possible to their original condition. Test holes performed in the street were patched using materials matching existing conditions. Basic maintenance of traffic (signs, cones) were included. Survey was utilized to provide horizontal (coordinates) and vertical (elevation).

Martin State Airport Airfield Ramp Extension: AMT provided Utility Designation (Quality Level B) including marking and identifying known underground utilities that were provided on utility plans or verbal recollections, for the purposes of setting up test holes only on requested utilities at Martin State Airport in the area of the Airfield Ramp extension outlined on exhibits 1 and 2 provided by the client. Conductive utilities were marked utilizing geophysical prospecting techniques in conjunction with radio, and magnetic designating equipment. A utility sweep was performed to identify any unknown conductive utilities along the proposed storm sewer line corridor. Non-conductive utilities were marked utilizing above ground features, professional judgment, utility plats and/or as built and recollections. Utilities were marked utilizing standard marking paint and/or flags in accordance with APWA standard code to ensure accuracy in the collection of information. Basic Maintenance of Traffic (MOT) was provided including cones and signs as needed.

Additionally, AMT provided Utility Locating (Quality Level A) Test Holes. These services included notifying Miss Utility 48 hours in advance of excavation, and performing test holes at designated areas provided on Exhibits 1 and 2 by the client. Vacuum Excavation was utilized to expose utilities to minimize any potential for damage. Test holes performed were of minimum size (usually 1' by 1'). Three swing ties from visible benchmarks and/or features provided with topographic plan sheets were used to provide horizontal location. Vertical location was provided by utility cover (ground surface to top of utility). All utility attributes were documented on a test hole report. Backfill of test holes was performed utilizing material removed, if suitable. Areas were returned back as close as possible to their original condition. Test holes performed in the street were patched using cold patch. Basic maintenance of traffic (signs, cones) was included. Survey was utilized to provide horizontal (coordinates) and vertical (elevation).

BWI Airport Runway Boring Clearly Utility Designation: AMT provided Utility Designation (Quality Level B) including marking and identifying underground utilities within a 20 ft radius limit of approximately thirty (30) boring locations on airport runway as directed by client. Conductive utilities were marked utilizing Geophysical prospecting techniques in conjunction with radio, audio and electromagnetic equipment. A utility sweep was performed to identify any unknown conductive utilities. Non-conductive utilities were marked utilizing above ground features, utility plats and/or as built and recollections. Utilities were marked utilizing standard marking paint and/or flags in accordance with APWA standard code to ensure accuracy in the collection of the information. Basic Maintenance of Traffic (MOT) was provided including cones and signs as needed.

All task assignments were completed on time and within budget.

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