5.4 Recommendations

Recommended system accuracies and resolutions for meteorological data acquisition systems are given in Table 5-l. These requirements apply to the primary measurement system and assume use of a microprocessor digital recording system. If an analog system is used for backup, the values for system accuracy may be relaxed by 50 percent. Recommended response characteristics for meteorological sensors are given in Table 5-2. Manufacturer's documentation verifying an instrument's response characteristics should be reviewed to ensure that verification tests are conducted in a laboratory setting according to accepted scientific/technical methods. Data bases for use in regulatory dispersion modeling applications should be 90 percent complete (before substitution). The 90 percent requirement applies to each meteorological variable separately and to the joint recovery of wind direction, wind speed, and stability. Compliance with the 90 percent requirement should be assessed on a quarterly basis.

5. SYSTEM PERFORMANCE
 5.1 System Accuracies
 5.2 Response Characteristics of Meteorological Sensors
  5.3 Data Recovery
      5.3.1 Length of Record
      5.3.2 Completeness Requirement
  5.4 Recommendations