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Updated September 05, 2000


Anchor and Satellite Sites RFP Questions


Questions and answers on the Anchor and Satellite Sites RFP will be posted here. If you have a question on this RFP e-mail Karen Magliano

Q: What will be the filter diameter for the 24-hour samplers?

R: 47 mm filters are used in all samplers that are under consideration.

Q: What will be the filter diameter for the MOUDI sampler?

R: The MOUDI substrates can be either 37 or 47 mm, depending on the particular MOUDI unit. You can assume 47 mm for the purposes of this proposal.

Q: Will the 24-hour samplers be Anderson or R/P? Will the Study supply the mounting rings?

R: The manufacturer of the filter sampler (L and M in Table 1 of the RFP) has not been selected. We expect to use the same model speciation sampler as that to be selected by ARB for their California network. The Study will supply mounting rings, as needed.

Q: Does the Study want Zefluor filters for the MOUDI sampler?

R: Commercially available filters have been found to be too thick for use as MOUDI substrates. MOUDI substrates must be cut or punched from sheets of aluminum foil or Teflon.

Q: Does the Study or ARB have an SOP for doing carbon on aluminum filters? Al melts at ~660 o C, and elemental carbon is pyrolyzed in the 650 - 800 oC range - does this present any problems?

R: Neither the Study or ARB has such an SOP. Due to the melting point of Al, the temperature during analysis of these substrates typically does not exceed 660 oC.

Q: Table 2 refers to "saturation" sites. The context implies "satellite" sites. Which is correct?

R: Table 2 should read "satellite" sites, not "saturation" sites.

Q: The RFPs show both the satellite site and anchor site operators being responsible for the DUSTTRAK (A) measurements at Edwards in summer and Walnut Grove (Ground) in winter. It makes sense that these are satellite annual measurements. Is this correct?

R: It can be assumed that the satellite site contractor will be responsible for the DUSTTRAK measurements at these sites year-round.

Q: Do you have a file with the lat/lons for the sites in Table 2 of each RFP?

R: Lat/lons have not been determined. With the exception of a few existing sites, the locations in Table 2 are desired areas, not exact sites. The exact site locations are to be selected during 1999. A table containing the approximate lat/lons used to generate the maps in the field program plan will be posted on the web site during the week of January 11th.

Q: Has a specific tower been selected at the Walnut Grove site? Can we assume that the Study will make all the arrangements for access and power and that we will have access as needed to an elevator?

R: Arrangements have not yet been finalized for a tower in the Walnut Grove area. For your proposal, you can assume that the Candelabra Tower will be used, as it was in the 1995 Integrated Monitoring Study. You can assume that the Study will make all arrangements for access and power, and that elevator access will be available.

Q: The Satellite Network RFP states that the contractor is not responsible for measurements collocated with Backbone site monitoring. The Dec 20, 1998 draft of the Program Plan, pages 4-5 and 4-6, discuss the seven Satellite sites at which PM10 measurements are to be made and states that the equipment is collocated with backbone sites which are listed. However, Table 2 of the RFP shows only one site (COP) having PM10 collocated with backbone monitoring. The remaining six sites are not identified as Backbone sites. Are the six sites Backbone sites and, if so, who is responsible for the mini-vol and DUSTRRAK measurements at these sites, the Backbone or Satellite contractor?

R: The satellite site contractor will be responsible for the PM10 mini-vol and DUSTTRAK operations at the seven PM10 sites. While these measurements are co-located at existing ARB or District sites, they were not called "backbone" sites because the PM10 measurements will be operated on an offset schedule from the routine backbone operations.

Q: Will there be an estimated cost provided by the Study to perform the anchor and Satellite site operations? There was no mention of a cost on the cover letter provided by ARB.

R: We do not plan to place an upper budget limit for operation of the anchor and satellite sites in the RFP. We would like to get realistic budget estimates from the respondents and will then evaluate whether we need to make any changes to the program.

Q: Chloride is in the program plan, but not in the RFP. Should chloride be measured on the PM and MOUDI samples?

R: Yes, chloride should be measured on the PM and MOUDI samples.

Q: Gravimetric analysis of the MOUDI samples is not discussed in either the field program plan or the RFP. Should gravimetric analysis of MOUDI samples be included?

R: Yes, gravimetric analysis of the MOUDI samples should be included.



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