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# OAR Box 

# 1112 Prepped byRyan Dugan



## Document

Number: 

# 45 ) ll-C- 7 Docket Number: 

# A-83-2 2

Printed 4/16/20089:12:07AM

Sheet 45of 97P. 2
UNITE D STATES ENVIRONMENTA L PROTECTIO N AGENC YA"<$

J ~2_ - £
_ ENVIRONMENTA L MONITORIN G SYSTEM S LABORATOR Y

RESEARC H TRIANGL E PAR K—fT , _/* _K , NORT H CAROLIN A2771 1 _£X - •—/

May30 , 198 U

Mr . Leonar d Bruckma n Director , Ai r Complianc e Departmen t o f Environmenta l Protectio n Stat e o f Connecticu t Stat e Offic e Building Hartford , Connecticu t 0611 5 RE : MM82-333 , Reques t fo r an Equivalen t Metho d Determinatio n fo r Low-Volume Lea d Sample r Dea r Mr . Bruckman : I n regard t o you r lette r o f Apri l 2 , I98U , I hop e tha t th e following comment s wil l hel p t o explai n wh yw e approve d you r low-volume lead sample r a s a modificatio n o f th e referenc e metho d (unde r Sectio n 2. 8 o f Appendi xC o f U O CFR Par t 58 , Modification s o f Method s b yUsers) , rathe r tha n designat

ing i t a s an equivalen t metho d (referenc e our lette r o f approval , date d February29 , 198U) . A s you , o f course , know , th e low-volume lead sample r i s ver ysimila r t o th e conventiona l high-volume sample r specifie d i n th e Federa l Referenc e Metho d fo r Lead (U O CFR Par t 50 , Appendi xG) , an d th e analytica l procedur e i s identical . Th e onl yprincipl e differenc e i s th e muc hlowe r ai r sampl e flowrat e o f th e low-volume sample r an d th e differen t hardwar e neede d t o maintai n and mete r thi s lowe r flowrate . Whil e thes e difference s ar e certain

l yno t trivial , theyals o d o not , i n ou r opinion , constitut e a n extensive de

partur e fromth e referenc e method . Accordingly , i t i s entirel yappropriat e t o approv e th e low-volume sample r a s a modificatio n t o th e referenc e metho d unde r Sectio n 2.8 . Mor e importantly , approva l o f a modificatio n t o a referenc e metho d unde r Sectio n 2. 8 restrict s us e o f th e modificatio n t o a specifi c area , a s oppose d t o th e universa l availabilit yprovide d b ydesignatio n a s a n equivalen t method . I n thi s case , thi s restrictio n i s appropriat e fo r tw o reasons . First , whil e you r test s demonstrate d t o ou r satisfactio n a n acceptabl e agreemen t betwee n lead sample s collecte d b yth e low-volume an d high-volume sampler s i n you r area , w e ar e no t sur e tha t suc hagreemen t woul d necessaril yb e foun d i n al l area s o f th e countr ywher e a n equivalen t metho d migh t b e used . W e therefor e fee l tha t additiona l testing mayb e necessarybefor e th e low-volume sample r coul d b e approve d fo r us e i n othe r area s o r fo r universa l us e a s a n equiva

len t method . Secondly , th e leve l and degre e o f documentatio n o f th e design , construc
tion , operatio n an d qualityassuranc e procedure s o f th e modifie d sampler , whil e adequat e fo r you r ow n us e o f th e sample r withi n Connecticut , i s no tP. 3 

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sufficien t t o readil yallo wus e o r adoptio n o f th e sample r b yothe r monitor

ing agencies . I hop e tha t thi s explanatio n help s yo u understand ou r decision , an d tha t yo u wil l contac t u s agai n i f yo u wis ht o discus s th e matte r further . Sincerel yyours , 

# fjLJZtiu
Frank F . McElroy For : LarryJ . Purdue , Chie f Method s Standardizatio n Branc h Qualit yAssuranc e Divisio n (MD-77 ) Environmenta l Monitoring System s Laboratory