(a) Inspection.
(1) All roadway embankment construction must be performed under the inspection of a qualified geotechnical engineer or engineering geologist.
(2) The geotechnical engineer shall furnish a written opinion to the City Engineer/Planning Director or designee as to whether or not work has been performed in accordance with the approved Plans and recommendations.
(b) Minimum Standards Required for Site Density Testing.
(1) The minimum frequency of field density testing shall be as listed in Table 1307-8, unless otherwise approved by the City Engineer/Planning Director or designee.
(2) The testing frequencies are the minimums considered to provide effective quality control of soil and aggregate material compaction effort under normal conditions. Additional testing other than that specified should be performed if deemed necessary by a qualified Inspection and Testing Agency, the Geotechnical Engineer of Record, or the City Engineer/Planning Director or designee.
(3) All testing shall be in conformance with approved ASTM test methods.
Table 1307-8, Minimum Standards Required for Site Density Testing
Test Locations | Testing Frequency |
Embankments Fill sections for Streets, travel ways, and pipestem Driveways. | One density test shall be performed per 5,000 ft2 per 8-inch compacted lift. Under curb and gutter, one density test shall be performed per 300 ft. on alternating sides. |
Test Locations | Testing Frequency |
Subgrade Cut in existing Fill for Streets, travel ways, and pipestem Driveways. | Proof rolling, and evaluation and approval by the geotechnical engineer of record (undercut and stabilization may be necessary as determined by the geotechnical engineer of record). |
Subgrade Cut in natural soils. | Proof rolling, and evaluation and approval by the geotechnical engineer of record. |
Subbase Material For Streets, travel ways, and pipestem Driveways. | One density test shall be performed per 5,000 ft2 per 8-inch compacted lift. When the subbase aggregate is placed in layers or lifts, each lift shall be tested. Under curb and gutter, when placed before the subbase material in the Street, perform one density test per 300 ft. on alternating sides. |
Base Material | One density test shall be performed per 5,000 ft2 at the finished base grade. When the base aggregate is placed in layers or lifts, each 8-inch compacted lift shall be tested at the required frequency. |
Storm Drainage System – Backfill * | One density test shall be performed per 300 ft. and at vertical intervals not to exceed 12 inches when within current, or future, City of Martinsburg Right-of-Way. |
Sanitary Sewer, Water and Gas Mains – Backfill * (Note: Field density test reports must be provided to the City of Martinsburg Site Inspector before field approval is given for issuance of tap permits.) | One test shall be performed per 300 ft. or between utility holes if less than 300 ft. apart and at vertical intervals not to exceed 12 inches when within current, or future, City of Martinsburg Right-of-Way. |
Sanitary Sewer, Water and Gas Laterals – Backfill for Stub Constructed in Conjunction with Utility Main * | One test shall be performed per 5 laterals and at vertical intervals not to exceed 12 inches where within current, or future, City of Martinsburg Right-of-Way. |
Test Locations | Testing Frequency |
Sidewalks and Driveway Aprons | Sidewalk subgrade: One test shall be performed per 500 ft. on alternating sides at the subgrade elevation. A minimum of two tests per Street is required. Driveway apron: One test per apron shall be performed. |
Asphalt Concrete Pavement (Note: The thin lift nuclear density test can be used for any surface course placed directly over an aggregate pavement or on a lift of 135 lbs/yd2 (or greater) that is placed on an asphalt pavement course.) | Saw Cuts or Cores Two Cuts or cores represent one test. A minimum of two tests per Street are required regardless of the Street length. One test shall be performed per 500 ft. of roadway or 1,000 ft. of any pass made by a paving train. OR Conventional Nuclear Density Gauge One test shall be performed per 500 ft. of roadway. Five tests shall be performed in each test section. A minimum of two test sections per Street is required regardless of the length of the Street. Thin Lift Nuclear Density Gauge Test areas are defined as Lots and sublots. A Lot consists of 5,000 ft. of a pass made by a paving train. Each Lot is divided into five sublots of equal size. Two tests will be performed on each sublot. Each separate Street shall consist of at least one Lot. Streets less than 500 ft. in length shall be tested a minimum of twice. |
*Testing required beneath Structures only, including but not limited to sidewalks, Driveways,
Streets, and stoops.
(Ord. 2022-13. Passed 11-10-22.)