quality assurance project plan (qapp) - National Atmospheric ...

Project: NADP Site Survey Program
Section B
Revision: 1
Date: March 2009
Page 27 of 41
• National Weather Service (NWS) Stick Precipitation Gage – SOP-EPW07061-1430
EEMS will check the response of the gages as found over the range appropriate for the gage, and
will attempt to repair and recalibrate any Belfort gage in which the difference between the applied
depth and recorded depth is out of tolerance as defined in the NADP QAPP. Stick gages and
electronic gages will not be adjusted.
EEMS developed SOPs for conducting surveys of the different types of precipitation collectors
found at NADP sites, including the collector sensor and motorbox:
• ACM NTN and AIRMoN Precipitation Collector – SOP-EPW07061-1310
• ACM MDN Precipitation Collector – SOP-EPW07061-1320
• N-CON Precipitation Collector – SOP-EPW07061-1330
EEMS developed SOPs for conducting surveys of the field laboratory activities, equipment and
supplies found at NTN and AIRMoN NADP sites:
• Ohaus Balance (or electronic scale) – SOP-EPW07061-1210
• pH Meter – SOP-EPW07061-1220
• Conductivity Meter – SOP-EPW07061-1230
Field laboratory includes data that pertains to performance of the field laboratory equipment
(bucket balance, pH measurement system and specific conductance measurement system), the
inventory of supplies and recordkeeping by the site operator.
For AIRMoN sites, CAL will provide EEMS with a simulated rain sample of known pH and
specific conductance. EEMS will request from the site operator that he or she analyze the sample
as though it were a regular weekly sample. EEMS will be able to assess the procedures executed
by the site operator in completing this task.
The methods developed and described in the performance survey SOPs are intended to be used to
determine and ensure that data collected and recorded by the NADP conforms to the performance
acceptance criteria established in the NADP QAPP. Table 3 is a summary of these performance
acceptance criteria.
Table 3. Performance Acceptance Criteria
Site Measurement Survey Method Acceptance Criteria
Belfort Precipitation Depth Standard weight ± 0.10 in
ETI Precipitation Depth Standard weight 0.05 in
OTT NADP Pluvio Precipitation Depth Standard weight 0.05 in
Stick Precipitation Depth Standard volumetric addition 0.01 in
File location
EEMS, Inc.