described in further detail in Volumes II and III

Transcription

1 A common prctice in both mbient ir monitoring nd i. source emission monitoring includes pretest preprsttionry high.nd representtive monitoring dt. These viding qulity described in further detil in Volumes II nd III re ctivities nd in References 1 nd The" pretest ctivities most importnt in mbient ir system design monitoring Monitoring network size.. Smpling sttion loction. b. common prctice in both mbient ir monitoring nd st- A source emission monitoring includes pretest preprtion tionry new project. During the pretest preprtion, n on-site for my be conducted in order to complete dministrtive visit for smple collection nd to gther technicl inform- detils for monitoring system design. tion PRETEST PREPARATION ABSTRACT for new project..the proper selection smpling sites tion probe siting in mbient monitoring is fundmentl in prond re: Probe siting. c. Method/equipment selection. d. The pretest ctivities most importnt in sttionry emission monitoring system design re: source Process design nd opertion fmilirity.. Mesurements performed to gther dt for design b. smple collection progrm. the Monitoring process to determine representtive c. conditions opertion DISCUSSION

2 ir monitoring system design Fctors tht could Ambient considered during mbient ir monitoring system design be re is normlly one the following: complince monitoring, emer- episode monitoring, trend monitoring, or reserch monitor- gency In considering the loction the network, ing. or more one following will be importnt considertions: monitoring the must pollution oriented; monitoring must be popultion oriented; be must be source oriented; nd/or monitoring must monitoring re-wide representtion ir qulity. provide should be provided for Criteri project monitoring net- new design. By wy exmple, criteri for design the work NAMS for TSP nd SO network re shown in Tble Tble 2 shows the NAMS requirements forco, 03,.nd NO nd topogrphic restrints. Meteorology (wind meteorologicl nd speed) not only ffect the geogrphicl loction direction on finl smpling sttion loction influence physicl ob- re in the immedite structions tht my lter ir flows, (e.g., re fences, nd buildings). Criteri should be provided for trees, sttion loction for smpling projects. new project criteri for network nd sttion design Providing the on-site inspection is n importnt fctor in the before in Reference in Volume II nd in References 1 nd The items discussed importnt during the pretest preprtion most summrized re here. Monitoring network size. The design the monitoring i. depends on the objective the project. The objective network Smpling sttion loction. The loction -smpling within sttions monitoring network is influenced primrily by the smpling sttion but lso the height the smpling or smpler. Topogrphic fetures tht hve the gretest probe the project nd in the qulity nd representtiveness success the dt. Tble summrizes the probe siting criteri

3 S02 AND TSP NATIONAL AIR MONITORING STAIION (NAMS) TABLE (Approximte CRITERIA sttions/re) number Concentrtion b Medium c Low d High tble is bsed This Reference Urbn res nd the number st- on will be jointly selected by EPA nd the Stte tions/re bhigh gency. SOz violting primry NAAQS- TSP violting primry concentrtion: by 20 percent. NAAQS concentrtion: SO violting 60 CMedium primry NAAQS" TSP percent Popultion ctegory SOs TSP TSP SO2 SO TSP High (>500,000) Medium (I00, ,000) (50, ,000) Low violting secondry NAAQS. coqcentrtion: SOz <60 percent primry dlow TSP l ss-thn secondry NAAQS. NAAQS;

4 TABLE CO, 03, AND NO2 NAMS CRITERIA This tble is bsed on Reference Two sttions per mjor urbn re: Os NAMS in ech urbn re hving Two 200,000. popultion one representtive mximum 03 conc (I) scle), (urbn NO NAMS in re hving popultion Two,000,000. I utnt Pol Criteri CO (I) one in pek conc re (micro scle), one in neighborhood where conc (2) exre significnt _neighborhood posures scle). 03 one representtive high density (2) res on the fringe popultion centrl business districts. NO2 one where emission density is highest (I) scle), (urbn one downwind the re pek NO (2) emissions, x

5 Pol- ]u- borhood TABLE SUMMARY OF PROBE SITING CRITERIA 2 Distnce supporting from Horiz 5 8 Should be >20 meters from trees Distnce from smpler to obst- should.be nerby flues Must hve minimum spcing from 5. this vries with height rods; monitor nd sptil scle Should be >20 meters from trees Distnce from inlet probe to be t lest twice the must the height the inlet probe bove Must hve unrestricted irflow round the inlet probe, 270 or if probe is on the side Must be 0 meters from inter- nd should be t section mid- Must be 2-10 meters from edge nerest trffic lne Must hve unrestricted irflow round the inlet probe Must hve unrestricted irflow round the inlet probe, 270 or if probe is on the side building Spcing from rods vries with trffic.4.6 Height bove meters spcing structure, ground, meters Other rnt Vert criteri Scle 2 15 >2 TSP All such s buildings, must be cle, lest twice the height the t protrudes bove the obstcl smpler Must hve unrestricted irflow round the smpler 270 No furnce or incinertion 4. SO All > >1 obstcle, such s buildings, obstc p otrudes building 4. No furnce or incinertion flues should be nerby" Micro 3 ± 1/2 loction block CO Middle, neigh (continued)

6 Pol ]u- Distnce supporting from Horiz Should be >20 meters from trees Distnce from inlet probe to Must hve unrestricted irflow round the inlet probe, or 270 Spcing from rods vries with 4. trffic Should be >20 meters from trees Distnce from inlet probe to the obstcle p otrudes height the inlet probe bove Must hve unrestricted i flow round the inlet probe, or 270 if probe is on the side Spcing from rods vries with 4. trffic is dependent CDistnce height furnce or incinertion flue, type fuel on wste burned, nd qulity fuel (sulfur nd sh content). This is to or void undue influences from minor pollutnt sources. Tble (continued) Height bove meters Other structure ground, meters criteri tnt Vert Scle spcing 03 All 3 15 >1 such s buildings, obstcle, be t lest twice the- must the obstcle protrudes height the inlet probe bove if probe is on the side building 3 15 NO2 >1 All such s buildings, obstcle, be t lest twice the must building probe is locted when rotop, this seprtion distnce is in reference to on prpets, or penthouses locted on the ro. wlls, bsites meeting this criterion would be clssified s middle scle (see not 2 text).

7 source emission system desiqn Fctors tht Sttionry be considered during sttionry should emission monitoring source design re discussed in Volume II The items system importnt most the pretest preprtion during re: Fmiliriztion with process design nd opertion. i. The source emission monitoring requires fmilirity with success (e.g., fuel burning rte). collection Identify the key prmetersnd their e. representtive Mesurements needed for design the s ple collectio During the on-site visit, certin progrm re nor- mesurements mde tht re required for the design mlly the smple collec, tion progrm. These mesurements include:. Dimensions the stck or duct cross-section so smpling pln by equl cross-sectionl tht cn be deter- res mined. b. Gs velocity, gs temperture, nd gs moisture con- so tht requirements for isokinetic smpling tent be clcu- cn lted. process to be monitored. The following the res in which re is prticulrly importnt: fmilirity Process opertion principle.. Process flow chrt. b. Vribility process opertion in terms flow c. effluent to be monitored nd concentrtion rte pollutnt the effluent. in Process dt tht must be collected during smple d. opertion. levels Smple collection site considertions, including f. site loction (no turbulence due to upstre obstructions smple bends), mple port ccess nd size, size pltform for or sm- collection work, nd utilities vilbility ple smple col- for equipment. lection

8 8 8 The selection proper smpling sites nd preliminry mes- required for monitoring system design during the pretest urements is fundmentl in providing monitoring dt tht re preprtion My I0, 1979, p both high qulity nd representtive. i REFERENCES D Network Design for Stte nd Appendix Sttions (SLAMS) nd Ntionl Air toring (NAMS), Federl Register 40 CFR tions Air Moni- Locl St- Monitoring 58, Number 92, E Probe Siting Criteri for Ambient Air Qulity Appendix Federl Register 40 CFR 58, Number 92, My i0, Monitoring, 1979, p