# ADMINISTRATIV E RECOR D

UNITE D STATE S ENVIRONMENTA L

PROTECTIO N

AGENC Y REGIO N VIII
I N TH E MATTE R OF : CALIFORNIA GULC H SUPERFUN D SITE

, ASARC O INCORPORATED

, RESPONDENT

. PROCEEDIN G UNDE R SECTIO N 106(a ) O F TH E COMPREHENSIV

E ENVIRONMENTA L

RESPONSE

, COMPENSATION

, AN D LIABILIT Y ACT

, A S AMENDED

,

4 2 U.S.C

. § 9606(a ) 34819 4 S&? 

# FILEPLA N

" T J Secon d Orde r EP A Docke t NO T CERCLA-VIII-91- 1

9 ~

SECON D AMENDMEN T T O ADMINISTRATIV

E ORDE R FO R CERTAI N REMEDIAL INVESTIGATIO N

STUDIE S

A s provide d unde r Paragrap h 84
, Sectio n XXVIII

, pag e 20
, o f t h e above reference d Administrativ e

Order

, th e Orde r i s hereb y amende d a s follows : 1

. Paragrap h

1 2 i s amende d t o rea d a s follows : Afte r th e firs t sentenc e ad d "Wor k Plan " als o mean s th e "Smelte r Site Investigatio n Wor k Plan

, Californi a Gulc h Site

, Leadville

, Colorado

, Augus t 1991, " affixe d t o th e Secon d Amendmen t t o thi s Order and hereafte r t o b e referre d t o a s Exhibit 8 t o thi s Order

. 2

. Appendi x A t o th e above reference d Orde r i s amende d b y addin g th e followin g ne w section : F

. Change s t o Smelte r Site Investigatio n

Work Plan

, Californi a Gulc h Site

, Leadville

, Colorado

, Augus t 1991
, Exhibi t 8

. 1 ) Sectio n 2.3.3
, Pag e 2-8 : A t pag e 2- 8 afte r th e subsectio n entitle d "Reporting, "

th e followin g subsection s ar e adde d a s clarificatio n

o f th e modelin g effort : Meteorologica l

Dat a Meteorologica l dat a collecte d fro m a weathe r statio n locate d a t Colorad o Mountai n Colleg e in Leadvill e wil l b e used fo r modeling

. Thi s statio n ha s collecte d hourl y averages o f win d speed

, win d direction

, temperature
,

relativ e humidity

, an d win d stabilit y 

### (expresse d as sigm a theta ) since installatio n i n October

, 1990

.T h e perio d fro m Octobe r 1
, 199 0 through Septembe r 30
, 199 1 wa s use d fo r modeling

. Sinc e th e us e o f dat a fro m on e meteorologica l statio n i s insufficient

,

a review wil l be conducte d o f several 

### year s o f meteorologica l

dat a collecte d a t th e Leadvill e airpor t t o determin e i f th e perio d selecte d i s anomalous

. Mode l Inpu t Parameters Fo r Eac h Smelte r Locatio n (DERIVE D FRO M LITERATURE ) Th e parameter s neede d as inpu t t o th e model fo r eac h smelte r 

### include d th e following :

o Locatio n

and elevation ; 

### o Dates o f operatio n (emission s star t an d en d dates

, lengt h o f operation) ; 

### o Type s an d number s o f stacks ; o Stac k height s an d inner diameters ; o Exhaus t temperature s

an d velocities ; 

### o Meta l concentratio n

i n exhaus t (relate d t o productio n rate) ; 

### o and

, Particl e siz e distribution s

fo r smelte r emissions

. Attempt s wer e mad e t o obtain actua l dat a specifi c t o eac h smelte r fo r eac h paramete r o f interest

. However

, when actua l dat a wer e unavailable

, alternativ e

approaches

,

(i.e.

, comparison s

t o simila r operations ) wer e use d i n orde r t o arrive at reasonabl e estimate s o f th e values

. 

### Particl e siz e distributio n dat a fo r roaster s an d blas t furnace s wer e estimate d base d o n informatio n provide d b y ASARCO

.

Tabl e 1 (Attachmen t 1 ) list s th e estimate d particl e siz e distribution s 

### f o r controlle d an d uncontrolle d roasters an d blas t furnace s fo r us e i n ai r dispersio n modeling

. Th e particl e siz e dat a wer e base d o n measure d siz e distribution s

fro m simila r smelte r 

### operation s a t Eas t Helena

, Montana

. Du e t o th e lac k o f specifi c informatio n concernin g historica l smelte r operation s in th e Leadvill e area, th e particl e siz e distribution s

fo r bot h th e roaste r and blas t furnac e are assumed t o b e representativ e

o f 

### bot h controlle d an d uncontrolle d emissions

. T h e Inpu t Paramete r Tabl e (Attachmen t 2 ) list s th e value s fo r th e inpu t parameters

.

Column s 1 through 2 5 ar e value s take n fro m 

### historica l dat a o r estimate d based o n availabl e information

. Column s 2 6 through 39 contain value s fro m columns 1 throug h 2 5 whic h hav e bee n converted

, usin g simpl e mathematica l calculations

, ratios
, an d proportions
,

int o unit s fo r modelin g purposes

. 

### T h e followin g ar e brie f description s

o f th e informatio n containe d in eac h colum n o f data

, firs t t o th e left

, an d the n t o th e righ t
o f th e vertica l dividin g lin e o n th e Inpu t Paramete r Table

. Eac hcolum n

i s identifie d an d discussed

, readin g th e tabl e column s i n order

. 

### Colum n 1

. Smelte r No

. i 

### T h e smelter s wer e sequentiall y numbered fo r referenc e purposes

. Colum n 2

. Emissio n Poin t 

### Location s o f smelters

, labele d o n th e tabl e as emissio n point
, wer e determine d fro m histori c maps o r existin g 

### reports
, and/o r field-located

.

Th e location s wer e the n mappe d o n a CA D system
, an d th e coordinate s wer e derive d fro m th e mapping

. Al l smelter s wer e eithe r field locate d and/o r foun d o n histori c maps , excep t fo r t h e Californi a Smelter

. I t wa s cited

, fo r modelin g purposes , sout h o f th e Arkansa s Valle y (AV ) Smelter

, 

### where histori c dat a indicate s th e smelte r existe d prio r t o bein g destroyed

. Column s 3 an d 4

. Eastin g Stat e Coordinat e an d Northing Stat e 

### Coordinat e T h e coordinate s liste d i n thes e column s ar e State Plana r Coordinates

.

The y represen t th e approximat e centra l poin t o f eac h facility

. Al l emission s fo r a give n facilit y wil l b e modele d a s originatin g fro m th e 

### poin t identifie d b y thes e coordinates

. Colum n 5

. Elevatio n (ft ) 

### Elevatio n fo r eac h poin t wa s derive d fro m th e mappin g describe d previously

. Column s 6 an d 7

. Emission s

Star t Dat e (Year)

, Emission s En d 

### Dat e (Year ) 

### Histori c document s an d recen t report s provide d detail s 

### concernin g the date s o f operatio n at eac h smelter

, a s wel l a s th e changes i n facilit y operation s ove r tim e (e.g.

, numbe r an d type s o f furnaces

, an d dus t contro l technologies)

.

Thes e dat a wil l be use d t o mode l th e exhaus t contribution s

o f individua l stack s (o r group s o f simila r stack s a t th e sam e sit e durin g th e sam e tim e 

### period ) an d t o includ e exhaus t fro m dus t stack s as wel l

a s furnac e stacks

, whe n suc h dat a ar e available

. Colum n 8

. Lengt h o f Operatio n (days ) 

### Th e date s o f operation
, describe d above

, wer e use d t oestimat

e th e tota l numbe r o f day s (ofte n ove r several years ) eac h stac k o r grou p o f stacks operated

. 

### Colum n 9

. Stac k Type * (B,BD,D,RD) Stack s ar e categorize d accordin g t o function s a s follows : j B
= Blas t furnac e stac k (withou t dus t controls ) 

### B D =Blas t furnac e stac k wit h associate d dus t stac k \ D
= Dust stac k fro m dus t chamber or baghous e - associate d wit h a blas t furnac e 

### RD
= Dus t stac k associate d wit h a reverbator y (i.e.

, roasting ) furnac e ; 

### A review o f historica l dat a indicate s tha t onl y tw o type s o f furnace s wer e commonl y used

, namel y (1 ) blas t furnaces

, fo r smeltin g an d (2 ) roastin g furnaces

, fo r 

### reductio n o f pyriti c ores

. Th e numbers

, type s an d productio n capacitie s o f furnace s wer e determine d in orde r t o provid e the numbe r o f correspondin

g stack s at

eac h smeltin g facility

. Cylindrica l

blas t furnace s alon e wer e mos t commonl y use d durin g th e approximat e perio d fro m 187 7 t o 1895
, wit h increase d pyriti c smeltin g the n necessitatin

g th e additio n o f reverbator y roastin g furnace s t o pretrea t ore s prio r t o smeltin g afte r 1895

. Column s 1 0 an d 11

. Tota l No

. o f Stack s an d No

. o f Stack s in Operatio n 

### T h e tota l numbe r o f th e give n for m o f stac k i s listed

. 

### Base d o n historica l report s o f minin g practice s al l o f th e stacks neve r operate d simultaneously

,

as furnace s require d repair betwee n smeltin g campaigns

. Th e numbe r o f stack s in operatio n reflect s thi s operationa l 

### information

. Colum n 12

. Remova

l Efficienc y 

### Fo r smelter s wher e dus t contro l was practiced

, historica l report s an d curren t knowledg e o f smeltin g 

### operation s wer e applie d t o estimat e th e percentag e o f emission s remove d b y th e dus t contro l technology

. Column s 1 3 an d 14

. Stac k Heigh t (ft ) an d Stac k Inne r Diamete r TTE T Thes e dimension s wer e obtaine d fro m (1 ) insuranc e maps , 

### ( 2) histori c descriptions

,

(3) measurement s fro m photographs

, o r (4 ) inference ; wher e detail s fo r a specifi c stac k wer e unavailable

,

th e stac k dimension swer

e inferre d o n th e basi s o f compariso n wit h simila r 

### know n o r measure d stacks

. 

### Colum n 15

. Stac k Exi t Temperature s

(degree s C ) Precis e exhaus t temperatur e dat a wer e no t foun d fo r mos t o f th e stacks identified ; therefore

,

a s agree d a t t h e Septembe r 27
, 1991
, Technica l Advisor y Committe e meeting
, 15 0 C was used

. Detail s regardin g th e justificatio n fo r derivatio n o f thi s valu e wil l b e 

### provide d t o th e EPA

. Colum n 16

. Blas t Furnac e Blowe r Volumetri c Flo w (ft-Vmin ) 

### Histori c report s liste d th e blowe r siz e an d flo w capacit y fo r man y o f th e smelters ; thes e dat a wer e use d t o infe r blowe r capacitie s fo r similar-size d

furnace s 

### lackin g histori c record s o f this type

. Colum n 17

. Blast/Dus t

Stac k Volumetri c Flo w (ft 3 /min ) Stac k ga s volumetri c flo w rates fo r blas t furnac e stack s an d associate d dus t stack s (i f present ) ar e base d on the siz e o f the ai r blowe r supplyin g ai r t o 

### t h e furnac e (se e ite m 17)

, estimate d ai r infiltratio n rates
, an d th e distributio n

o f exhaus t gas betwee n th e dus t chamber an d blas t furnac e exhaus t stack

. Tw o 

### operationa l condition s wer e assume d t o exist

. I f dus t chamber s wer e not associate d wit h a blas t furnace

, al l exhaus t gases exite d th e blas t furnac e stack

. I f a dus t chamber was used

, a portio n o f th e blas t furnac e exhaus t strea m was diverte d throug h th e dus t chamber

, whil e a portio n o f th e exhaus t gas continue d t o exi t fro m th e blas t furnac e stack

. Specifi c detail s o n 

### volumetri c flo w rat e calculation s

ar e provide d fo r eac h

o f th e tw o operationa l case s below

. 

### Blas t Furnac e Wit h Dus t Stac k Base d on curren t review an d understandin

g o f th e 

### historica l proces s descriptio n o f blas t furnace s operatin g wit h dus t recover y technology

, abou t 2 0 percent o f th e volumetri c flo w normall y exite d 

### throug h th e blas t furnac e stac k wit h abou t 8 0 percen t


### o f th e blower-suppl

y flow

, plu s infiltration

,

diverte d t o th e dus t chamber

. A n inflo w o f 5 0 percen t o f th e 

### blower-suppl y flo w wa s assume d fo r th e volum e exitin g th e blas t furnac e stack

. Therefore

, th e blas t furnac e stack flo w rat e i s calculate d as : Blas t Stac k Q
= 0. 2 x (1. 5 x Blowe r Q)

.

### T h e

dus t stac k associate d wit h th e blas t furnac e wa s assumed t o hav e a n additiona l infiltratio n

o f 5 0 percent

. Thus

, th e dus t stac k flo w rat e associate d wit h a singl e blas t furnac e was calculate d as : Blas t Dust Stac k Q
= 0. 8 x (1. 5 x Blowe r Q ) x 1.5

. I f multipl e blas t furnace s wer e ducte d t o a singl e dus t 

### chamber

, a s wa s usuall y th e case , th e dus t stac k volum e flo w rat e give n abov e was multiplie d b y th e numbe r o f furnace s i n operatio n (se e ite m 11)

. 

### Blas t Furnac e Withou t Dust Stac k Severa l histori c blas t furnace s di d no t us e dus t an d fum e recover y methods

, primaril y dus t chambers

. Fo r thes e blas t furnaces

, curren t engineerin g understandin

g o f th e histori c proces s was applie d t o estimat e th e volumetri c flo w rate

. I t wa s assume d tha t additiona l 

### air infiltratio n t o th e furnac e an d ductin g increase d th e volum e o f ai r leavin g th e stac k 2. 5 time s th e blower-supplie d

air stream

. Tha t is
, th e flo w rat e wa s compute d as : 

### Blas t Stac k Q
= 2. 5 x Blowe r Q

. Severa l histori c blas t furnace s ha d n o dus t contro l technology

. Fo r thes e blas t furnaces

, current 

### engineerin g understandin

g o f th e histori c proces s was applie d t o estimat e th e volumetri c flo w rat e as 5 0 percen t greate r tha n th e blower-supplie d

volumetri c 

### flo w rate

. Colum n 18

. Roaste r

Furnac e Exi t Velocit y (ft/min ) 

### T h e exi t velocit y use d fo r dus t stacks associate d wit h roastin g furnace s represent s a n average obtaine d fro m historica l researc h report s o f experimenta l 

### measurement s o n roastin g furnaces

. A n average velocit y o f 1,45 0 ft/mi n fo r 3. 5 foo t diamete r stacks wa s determined

. Exi t velocitie s fro m stack s othe r tha n 3. 5 foo t diamete r wer e scale d based on the cross

sectiona l are a o f th e stack

. I t was assume d tha t th e volum e flo w rates fro m roastin g furnac e dus t stack s wer e similar

. Therefore

, th e exi t velocit y was 

### compute d as : Roaste r Dust Exi t Velocit y = 145 0 x (3.5/D) 2 ; where : D
= diamete r o f roaste r dus t stac k (ft)

.

\Colum n

19

. Tota l Averag e Productio n Rat e (tons/day ) Furnac e capacitie s fo r man y o f th e histori c smelter s wer e availabl e i n histori c literature

. 

### Colum n 20

. Metal s (from ) Blast/Dus t Stac k Fum e (Ibs/day ) T h e percen t concentration s

o f lead

, cadmium

, arseni c 

### an d zin c i n blas t furnac e fum e wer e locate d i n histori c reports

. Thes e value s wer e combine d wit h fum e productio n dat a fo r 35-4 0 tons-per-da y capacit y 

### furnace

, t o determin e th e mas s o f th e fou r chemical s o n a Ibs/da y basis

. Th e dail y loa d ha s bee n adjuste d usin g a direc t proportio n o n th e basi s o f blas t furnac e productio n t o estimat e load s fo r furnace s wit h large r o r smalle r capacitie s tha n th e 35-4 0 tons-per-da

y capacity

. Colum n 21

. Tota l Metal s (from ) Blast/Dus t Stac k Fum e (tons ) Tota l meta l emissions i n fume s fo r th e lengt h o f operatio n (se e ite m 8 ) fro m eithe r a blas t furnac e 

### stac k o r blas t furnac e dus t stack ar e calculated

. Thi s 

### was compute d as th e produc t o f th e dail y averag e fum e emissio n rat e (se e ite m 20)

, th e lengt h o f operatio n i n days

, an d th e removal efficienc y (se e ite m 12 ) o f th e dus t an d fum e recover y equipmen t (dus t chambers)

. I t
wa s assume d tha t bot h dus t and fum e wer e controlle d at approximatel y th e sam e efficiency

. Dust chambers wer e use d t o remov e dus t b y impactio n remova l mechanism

, 

### whil e fum e wa s remove d b y condensation

. Colum n 22

. Metal s (from ) Blast/Dus t Stac k Dus t (Ibs/day ) T h e weigh t o f metal s produce d i n dus t o n a dail y basi s 

### w a s estimate d fro m historica l analyse s o f dus t fo r blas t furnace s wit h a 35-4 0 tons-per-day

capacity

. Colum n 23

. Tota l Metal s (from ) Blast/Dus t Stac k Dus t (tons ) Tota l meta l emissions o f dus t fo r th e lengt h o f operatio n (se e ite m 8 ) fro m eithe r a blas t furnac e 

### stac k o r a blas t furnac e dus t stack

. Thes e wer e compute d usin g th e sam e metho d outline d fo r ite m 21

. Colum n 2 4 an d 25

. Metal s (from ) Roaste r Furnac e Fum e an d Dust 

### TTbs/day ) an d Metal s (from ) Roaste r Furnac e Fum e an d Dus t (Ibs/day ) Thes e value s wer e unavailabl e in histori c literature ; 

### however

, dat a fro m th e 1950 s fo r th e A V Smelter ssinterin

g operation s wer e available

, an d wer e use d t o infe r th e compositio n

o f dus t an d fum e associate d wit h roastin g operations

.

Emission s

wer e compute d usin g emissio n factors publishe d b y the EP A i n AP-4 2 (Compilatio n o f Ai r Pollutan t Emissio n Factors

, 

### Supplemen t C

, Septembe r 1990 ) fro m sinterin g operation s a t primar y lea d smelters

. Th e emissio n facto r provide d 

### in AP-4 2 was adjuste d t o provid e emissio n estimate s fo r the metal s o f concer n based on the tons o f or e processe d an d th e metal s compositio n fro m th e A V 

### smelter

. Th e adjuste d emissio n facto r use d wa s 19. 7 Ibs

. metal s pe r to n o f or e processed

. PARAMETER S FO R EAC H SMELTE R LOCATIO N (CALCULATE D

VALUES ) T h e dat a ar e function s o f th e dat a liste d in column s 1 through 25
, an d represen t conversions

o r numerica l 

### calculation s necessar y t o presen t th e dat a int o th e for m needed a s model input

. Thes e dat a columns ar e 

### discusse d i n th e followin g paragraphs

. Column s 2 6 an d 27

. UT M E(m ) an d UT M N(m ) U T M coordinate s ar e liste d fo r us e a s mode l input

. Spatially

, thes e correspon d identicall y t o th e Stat e Plana r Coordinate s

liste d previously

,

an d ar e liste d in meters on the table

. 

### Colum n 28

. Stac k Heigh t (m ) Thi s colum n contain s uni t conversio n value s o f th e value s liste d i n Englis h unit s i n colum n 13

. Colum n 29

. Stac k Diamete r (m ) Thi s are a wa s calculate d fro m colum n 14

. Colum n 30

. Are a (m^ ) Thi s are a was calculate d fo r us e in othe r calculations

. Colum n 31

. Stac k Exi t Temperatur e

(K ) Th e exi t temperature s

liste d i n colum n 1 5 wer e converte d t o Kelvin s fo r modelin g purposes

. 

### Colum n 32

. Blas t Furnac e Stac k Volumetri c Flo w (m^/sec ) Thi s colum n contain s uni t conversions

o f th e value s liste d i n colum n 17

.Colum n

33

. Blas t Furnac e Stac k Exi t Velocitie s (m/sec ) 

### T h e exi t velocitie s in this colum n represen t th e metri c valu e o f flo w liste d in colum n 1 6 divide d b y th e stac k

are a i n column 3 0 (sinc e V = Q A)

. 

### Colum n 34

. Blas t Furnac e Dust Stac k Volumetri c Flo w (ro^/sec) Blas t furnac e dus t stac k flo w volume s ar e calculate d a s describe d previousl y i n ite m 17

. 

### Colum n 35

. Blas t Furnac e Dust Stac k Exi t Velocit y (m/sec ) Thes e velocitie s wer e calculate d usin g V = Q/A

. 

### Colum n 36

. Roaste r

Furnac e Dust Stac k Exi t Velocit y (m/sec ) 

### Thes e represen t conversion

s o f value s in Colum n 18

. Colum n 37

. Blas t Furnac e Stac k Emission s (g/hr ) Thes e values wer e calculate d fro m th e values liste d i n colum n 2 1 an d 23

. Colum n 38

. Dust Stac k Emission s (g/hr ) 

### Thes e value s represen t uni t conversions

o f th e value s liste d i n colum n 2 1 an d 23

. 

### Colum n 39

. Roaste r

Furnac e Dust Stac k Emission s (g/hr ) Thes e value s wer e calculate d fro m value s liste d in colum n 25

.
2 ) Afte r Sectio n 2.3.5
, Pag e 2-11 : Ad d Sectio n 2.3.6
, t o be entitle d "Tas k 5 - Buildin g Materia l 

### Investigation. "

The ne w sectio n i s t o rea d a s follows : T h e objectiv e o f Tas k 5 i s t o characteriz e

th e natur e an d exten t
o f meta l contaminatio n

presen t i n buildin g material s (e.g.

, smelte r debris

, cribbing

, mil l buildings

, etc. ) in orde r t o determin e th e leve l o f risk presente d fro m thes e material s an d 

### potentia l remedia l response

. T h e initia l phas e o f activit y fo r thi s task is t o identif y an d creat e a n inventor y o f th e type s o f material s removed fro m 

### smelte r sites
, identif y th e location s o f th e removed material

, an d identif y th e curren t use s o f th e material

.T h e

secon d phas e i s t o creat e maps o f th e locatio n o f th e removed 

### smelte r materials

, an d propos e samplin g location s t o obtain representativ e

dat a necessar y t o characteriz e

th e material

. Th e 

### materia l wil l be analyze d fo r tota l metal s as wel l as mineralogy an d speciation

. Th e dat a qualit y wil l b e Leve l II I a t a minimu m wit h th e laboratory/metho d

subjec t t o EP A concurrence

. 3 ) Sectio n 3.0
, Tabl e 3-1 : Th e analytica l metho d fo r analysi s o f arseni c i n soi l sample s i s change d t o Metho d 200. 7 CLP- M an d th e Reportin g Limit i s 

### change d t o 1 0 (mg/kg)

. Th e analytica l metho d fo r analysis o f lea d i n soi l sample s i s change d t o 

### Metho d 200. 7 CLP- M and the Reportin g Limi t i s change d t o 2. 0 (mg/kg)

. I T I S SO ORDERED : ENVIRONMENTA L

PROTECTIO N

AGENCY

, REGIO N VIII

B Y : DATE : Rober t L

. iDu^rey

, Dir^fcto r X X Hazardou s Wast e Manax?Q/rnenJL/pivisio n

1 0