### 53473 1 \ 

### UNITE D

STATE S ENVIRONMENTA

L PROTECTIO N AGENC Y REGIO N VII I 99 9 18T H STREE T

- SUIT E 50 0 DENVER

, COLORAD O 8020 2 

## Californi a Gulc h NP L Sit e MA R 2 9 199 3 Leadville

, C O PURPOSE : Thi s draf t fina l Screenin g Feasibilit y Stud y (SFS ) begins th e proces s o f determinin g th e remedia l cleanu p action s that coul d occu r a t th e Californi a Gulc h NP L Site

. Th e Superfun d regulation s (NC P 300.430(e) ) provid e that

, whe n needed

, a n alternative s screenin g ca n be'undertake n t o selec t a reasonabl e numbe r o f alternative s fo r detaile d analysis

. Afte r receivin g comment o n th e SFS

, EPA

, wit h th e advice an d assistanc e o f th e Advisor y Committee

, wil l releas e th e Fina l SF S fo r th e Site

. SCREENIN G CRITERIA : Th e NC P provide s tha t th e following thre e criteri a guid e th e developmen t an d screenin g o f remedia l alternatives : Effectiveness

. Focuse s o n the degre e t o whic h a n alternativ e reduce s toxicity

, mobility

, o r volum e through treatment

, minimize s residua l risk s an d afford s long

ter m protection

, complie s wit h ARAR s (requirement s o f existin g statute s an d regulations)

, minimize s short-ter m impacts

, an d ho w quickl y i t achieve s protection

. Implementabilitv

. Focuse s o n th e technica l feasibilit y an d availabilit y o f th e technologie s eac h alternativ e woul d emplo y an d th e administrativ e feasibilit y o f implementation

. Cost

. Cost s o f constructio n and an y long-ter m cost s t o operat e and maintai n th e alternative s shal l b e considered

. Cost s tha t ar e grossl y excessiv e compare d t o the overal l effectivenes s o f othe r alternative s ma y b e one o f the factor s use d t o eliminat e alternatives

. DETAILE D FEASIBILIT

Y STUDIES

. 20,000+ sample s hav e bee n collecte d an d 

### analyze d durin g th e remedia l investigation s nearin g completion

. Detaile d evaluatio n o f th e finding s o f thes e studie s t o (1 ) characteriz e th e natur e an d extent o f th e primar y contaminan t heav y metal s (lead

, cadmium

, arsenic

, zinc

, copper ) an d (2 ) asses s the specifi c ris k the y pos e i n th e environmen t wil l no w commence

. Detaile d feasibilit y studie s wil l b e conducte d o n th e limite d number o f alternative s identifie d i n th e SF S tha t represen t viabl e approache s t o remedia l action

. Th e detaile d feasibilit y studie s ca n focu s o n particula r contaminate d medi a o r specifi c area s o f th e site

. A s require d b y th e NCP

, EP A wil l b e assurin g that th e publi c hav e opportunitie s fo r involvemen t i n a wid e variet y o f site-relate d decisions

, includin g sit e analysi s an d characterization

, alternatives analysis

, and selectio n o f remedy

. (over )

### Contact :

Writte n comment s o n th e draf t fina l Screenin g Feasibilit y Stud y ca n b e directe d to : K e n Wangerud

, Remedia l Projec t Manage r Californi a Gulc h NP L Sit e U

. S

. Environmenta l Protectio n Agenc y 99 9 18t h Street

, Suit e 50 0 Denver

, C O 80202-240 5

### CALIFORNI

A GULC H SIT E SOURCE S I N SCREENIN G FEASIBLIT Y STUD Y ARE A

Impounde d Tailin g 

### Non-Residentia l Are a Soil s Smelte r Debri s Fluvia l Tailin g Strea m Sediment s In-Residenc e Dus t 

### Wast e Roc k Pile s Residentia l Are a Soil s Sla gSIIEWID E GENERA L RESPONS E ACTION S Genera l Respons e Actio n 

### Descriptio n N o Actio n Institutiona l Control s 

### Containmen t Removal/Transport/Disposa l Treatmen t

Resourc e Utilizatio n 

### N

o control

, or cleanu p o f sourc e contamination

. Serve s a s baselin e for comparison

. Legal and physica l restriction s applie d t o sourc e sites intende d t o contro l o r preven t present an d futur e us e an d acces s t o source

. Physica l restriction s applie d t o th e source s t o contro l release o f contaminants

. Complet e o r partia l remova l o f sourc e materia l followe d b y transportatio n and disposa l at a differen t location

. 

### Physica l o r chemica l measure s applie d t o th e source materia l that reduc e th e toxicity

, mobility

, and/o r volum e o f th e contaminant s 

### present

. Us e o r reus e o f th e sourc e materia l a s a commercia l produc t which

, b y th e us e o r reuses , remove s th e sourc e partiall y o r totall y fro m th e site

.



### Shee t 1 o f 1DESCRIPTIO N

AN D INITIA L SCREENIN G OF POTENTIALL Y APPLICABLE REMEDIA L TECHNOLOGIE S

AN D PROCES S OPTION S Genera l Respons e Action s Remedia l Technolog y Proces s Optio n N o Actio n Institutiona l Control s

Containmen t

Removal

, Transport

, Disposa l Non e

Lan d Us e Control s Acces s Restriction s Communit y Awarenes s Surfac e Wate r Control s Sourc e Surfac e Control s

Barrier s

Remova l

Transpor t Non e

Zoning

, Dee d Restriction s Fencin g an d Poste d Warning s Informatio n an d Educatio n Program s Diversio n Ditche s Channelizatio n Gradin g In-sit u Mixin g Revegetatio n Simpl e Cove r Multi-Laye r Cove r Retainin g Structure s Sedimen t Dams/Trap s Constructe d Wetland s Mechanica l Excavation/Dredgin g Vacuum Dredgin g Demolitio n Decontaminatio n Purchase/Replacemen t Truc k Haulin g Slurryin g

Shee t 1 o f 2DESCRIPTION

AN D INITIA L SCREENIN G O F POTENTIALL Y APPLICABLE REMEDIA L TECHNOLOGIE S

AN D PROCES S OPTION S (Concluded ) Genera l Respons e Action s Remedia l Technolog y Proces s Optio n Disposa l

Treatmen t Physical/Chemica l

Therma l Treatmen t

Resourc e Recover y Resourc e Utilizatio n On-Sit e Repositor y On-Sit e Consolidatio n Underground * Offsit e Disposal * Soil Washin g In-sit u Soil Flushing * Electrokinetics * Physica l Separatio n Neutralizatio n Stabilizatio n In-sit u Stabilizatio n Molte n Glass * Plasm a Arc * In-sit u Vitrification * Smelting *

* Proces s Optio n no t retained

Shee t 2 o f 2ALTERNATIV

E EVALUATIO N FO R IMPOUNDED TAILIN G
Alternativ e Number_____________

_

Description____________

_ 1 N o Actio n 2 Institutiona l

Control s 3 Containmen t

(Surfac e Wate r Control)/Institutiona l

Control s Surfac e Wate r Control Options : Diversio n Ditc h Channelizatio n 4 Containment

(Surfac e Wate r Control

, Sourc e Surfac e Control) / Institutiona l Control s Surfac e Wate r Contro l Options : Diversion Ditc h Channelizatio n Source Surfac e Contro l Options : Revegetatio n Simpl e Cove r Multi-Laye r Cove r 5 Containmen t

(Surfac e Wate r Control

, Surfac e Barrier) / Institutiona l Control s Surfac e Wate r Contro l Options : Diversio n Ditc h Channelizatio n Surfac e Barrie r Options :

. Sedimen t Dams/Trap s Retainin g Structur e

Shee t

1 o f 2ALTERNATIV

E EVALUATO N FO R IMPOUNDE D TAILIN G (Concluded )
Alternativ e • ____Number_________________Description_____ • • -____

_ * 6 Containment

(Surfac e Wate r Control

, Sourc e Surfac e Control

, Surfac e Barrier)/Institutiona l

Control s Surfac e Wate r Contro l Options : Diversio n Ditc h Channelizatio n Sourc e Surfac e Control Options : Revegetatio n Simpl e Cove r Multi-Laye r Cove r Surfac e Barrie r Options : Sedimen t Dams/Trap s Retainin g Structur e 7 Removal/Transport/Disposal/Institutiona l Control s Remova l Options : • Mechanica l Excavatio n Transpor t Options : Truc k Haulin g Disposa l Options : On-sit e Consolidatio n _______________On-sit

e Repository________

_________
* Retaine d Alternativ e

Shee t 2 o f 2ALTERNATIV

E EVALUATIO N FO R NON-RESIDENTIA

L ARE A SOIL S
Alternativ e ___Number_________________Description____________

_ * 1 N o Actio n * 2 Institutiona l

Control s * 3 Containmen

t (Surfac e Wate r Control

, Sourc e Surfac e Control)/Institutiona l

Control s Surfac e Wate r Contro l Options : Diversio n Ditc h Sourc e Surfac e Control Options : Revegetatio n Simpl e Cove r Multi-Laye r Cove r * 4 Containmen t

(Surfac e Wate r Control

, Sourc e Surfac e Control

, Surfac e Barrier)/Institutiona l

Control s Surfac e Wate r Control Options : Diversio n Ditc h Source Surfac e Contro l Options : Revegetatio n Simpl e Cove r Multi-Laye r Cove r Surfac e Barrie r Options : Sedimen t Dams/Trap s Retainin g Structur e * 5 Removal/Transport/Disppsal/Institutiona l Control s Remova l Options : Mechanica l Excavatio n Transpor t Options : Truc k Haulin g Disposa l Options : On-sit e Consolidatio n ______________On-sit

e Repository____________

______ Retaine d Alternativ e

Shee t 1 o f 1ALTERNATIV E EVALUATIO N FOR SMELTE R DEBRI S
Alternativ e Number___________

_

Description_______

_ * 1 N o Actio n * 2 Institutiona l

Control s * 3 Removal/Transport/Disposal/Institutiona l Control s Remova l Options : Mechanica l Excavatio n Transpor t Options : Truck Haulin g Disposa l Options : On-sit e Consolidatio n On-sit e Repository______________

_ Retaine d Alternativ e

Shee t 1 o f 1ALTERNATIV E EVALUATIO N FO R FLUVIA L TAILIN G
Alternativ e Number_________________Description_________

_ 1 N o Actio n

. 2 Institutiona l

Control s 3 Containmen

t (Surfac e Wate r Control

, Sourc e Surfac e Control)/Institutiona l

Control s Surfac e Wate r Control Options : Diversio n Ditc h Channelizatio n Sourc e Surfac e Contro l Options : Revegetatio n Simpl e Cove r Multi-Laye r Cove r 4 Containmen

t (Surfac e Wate r Control

, Surfac e Barrier) / Institutiona l Control s Surfac e Wate r Control Options : Diversio n Ditc h Channelizatio n Surfac e Barrie r Options : Sedimen t Dams/Trap s Retainin g Structur e Constructe d Wetland s

Shee t

1 o f 2ALTERNATIV E EVALUATIO N FO R FLUVIA L TAILIN G (Concluded )
Alternativ e Numbe r Descriptio n

_ _ __ _ * 5 Containment

(Surfac e Wate r Control

, Sourc e Surfac e Control

, Surfac e Barrier)/Institutiona l

Control s Surfac e Wate r Contro l Options : Diversion Ditc h Channelizatio n Sourc e Surfac e Contro l Options : -Revegetatio n Simpl e Cove r Multi-Laye r Cove r Surfac e Barrie r Options : Sedimen t Dams/Trap s Retainin g Structur e * 6 Removal/Transport/Disposal/Institutiona l

Control s Remova l Options : Mechanica l Excavation Transpor t Options : Truc k Haulin g Disposa l Options : On-sit e Consolidatio n

____________

On-sit e Repositor y
_________________

_ * Retained Alternativ e

Shee t 2 o f 2ALTERNATIV

E EVALUATIO N FO R STREA M SEDIMENT S
Alternativ e Number_________________Description___________

_ * 1 N o Actio n * 2 Institutiona l

Control s * 3 Containmen t

(Surfac e Wate r Control)/Institutiona l

Control s Surfac e Wate r Control Options : Diversio n Ditc h Channelizatio n * 4 Containment

(Surfac e Barrier) / Removal/Transport/Disposal/Institutiona l

Control s Surfac e Barrie r Options : Sedimen t Dams/Trap s Constructe d Wetland s Remova l Options : Mechanica l Excavation Vacuum Dredgin g Transpor t Options : Truc k Haulin g Slunyin g Disposa l Options : On-sit e Repositor y On-sit e Consolidatio n * 5 Removal/Transport/Disposal/Institutiona l Control s Remova l Options : Mechanica l Excavation Vacuu m Dredgin g Transpor t Options : Truc k Haulin g Slunyin g Disposa l Options : On-sit e Repositor y _______________On-sit

e Consolidation_________________

_ * Retaine d Alternativ e

Shee t 1 o f 1ALTERNATIV

E EVALUATION FO R IN-RESIDENC E DUS T

Alternativ e Numbe r Descriptio n * 1 N o Actio n * 2 Institutiona l

Control s * 3 Removal/Transport/Disposal/Institutiona l Control s Remova l Options : Decontaminatio n ______________Purchas

e o r Replacemen t

_________ * Retained Alternativ e

Shee t 1 o f 1

### SCREENIN

G FEASIBILIT Y STUD Y REMEDIATIO N ALTERNATIVE S WAST E ROC K 

### Alternativ e 1 : N o Actio n 

## Alternativ e 2 : Institutiona l Control s Alternativ e 3 : Containmen t (surfac e wate r controO/Institutiona l

Control s -Diversio n Ditc h o r Channelizatio n Alternativ e 4 : Containmen t (surfac e wate r control

, surfac e barriers)/lnstitutiona l Control s



## - Diversio n Ditc h o r Channelizatio n



## - Sedimen t DamsATraps

, Retainin g Structure s Alternativ e 5 : Containmen t (surfac e wate r control

, sourc e surfac e controD/lnstltutlona l Control s



## - Diversio n Ditc h or Channelizatio n



## - Grading

, Revegetation

, Simpl e Cover

, Multi-Laye r Cove r Alternativ e 6 : Containmen t (surfac e water control

, sourc e surfac e control

, surfac e barriers)/lnstltutlona !

Control s



## - Diversio n Ditc h o r Channelizatio n

- Sedimen t Dams/Trap s o r Retainin g Structure s

- Grading

, Direc t Revegetation

, Borro w Cover

, Multi-Laye r 

## Cove r Alternativ e 7 : Removal/Trahsport/Dipsosal/Instltutiona l

Control s



## - Mechanica l Excavatio n

- Truc k Haulin g



## - On-slt e Consolidation

, On-slt o Repositor y 

## Alternative s Retaine d 

## Alternativ e Removed Fro m Furthe r Consideratio n

### SCREENIN

G FEASIBILIT Y STUD Y REMEDIATIO N ALTERNATIVE S RESIDENTIA L ARE A SOILS



## Alternativ e 1 : N o Actio n Alternativ e 2 : Institutiona l Control s Alternativ e 3 : Containmen t (surfac e water controD/lnstitutiona l

Control s

- Diversion Ditc h o r Channelizatio n 

## Alternativ e 4 : Containmen t (sourc e surfac e controD/lnstitutiona l

Control s

- In-slt u Mixing

, Revegetatlon

, Simpl e Cove r 

## Alternativ e 5 : Containmen t (surfac e water control

, sourc e surfac e controD/lnstltutlona l Control s

- Diversion Ditche s o r Channelizatio n

- In-sit u Mixing

, Revegetation

, Simpl e Cove r Alternativ e 6 : Removal/Transport/Dlpsosal/lnstitutiona l

Control s



### - Mechanica l Excavatio n



## - Truc k Hauling

- On-slt e Consolidation

, On-sit e Repositor y Alternative s Retaine d Alternativ e Remove d Fro m Furthe r Consideratio n

## ALTERNATIV

E EVALUATION FO R SLA G PILE S

ALTERNATIV E DESCRIPTIO N NUMBE R

* 1 N

o Actio n

* 2 Institutiona l

Control s -Fencing/dee d restrictions/us e restriction s Source Surfac e Controls/Institutiona l

Control s -Cove r pile s wit h soil/clay mixture / revegatat e Surfac e Water/Barrier/Institutiona l

Control s -Diversio n ditche s aroun d th e pile s Removal/Transport/Disposal/Institutiona l

Control s -Remova l o f pile s for consolidatio n on sit e

* 6 Resourc

e Utilizatio n -Railroa d Ballast/Additiv e Materia l fo r Constructio n

*=Retained Alternativ e