UNITE D

STATE S ENVIRONMENTA L

PROTECTIO N AGENC Y REGIO N VII I' 9 9 9 18t h STREE T

- SUIT E 50 0 DENVER

, COLORAD O 80202-246

6 

## 2711 8

FINA L POLLUTIO N REPOR T 

### Midval e Sla g OU 2 (RV5 ) Cemeter y 

# ADMINISTRATIVE

RECOR D

I

. HEADIN G Date : 

### Subject : From : .To : POLRE P No. : 

# SFFiL E

NUMBE R Z-17-o f 07/07/9 6 

### Midval e Sla g NP L Sit e (OU2 ) [RV5 ] Cemeter y Mik e Zimmerman

, OS C Ann e Spencer

, EP A Headquarter s Emergenc y Respons e POLRE P # 2 an d Fina l I I

. BACKGROUN

D Sit e No. : CERCLI S No : 

### Respons e Authority : Stat e Notification : Actio n Memorandum : Star t Date : Completio n Date s 7

1 UTD08183427 7 CERCL A UDE Q Notifie d 10/29/9 6 10/31/9 6 04/17/9 7 III

. SIT E INFORMATIO N 

### A

. Inciden t Category Time-Critical

, NP L 

### B

. Site Descriptio n 1

. Sit e Descriptio n T h e entir e Midval e Sla g sit e consist s o f abou t 53 0 acres ; OU 2 cover s abou t 20 0 acre s o f the Site

. A smelte r operate d o n OU 2 fro m 189 7 unti l 1958

. Ove r th e years , i t change d fro m a coppe r t o a lea d smeltin g facility

, producin g gold/lead/silve r

bullio n fro m sulfid e ores

. Thi s Remova l Actio n addresse d th e nee d t o mitigat e th e threa t o f contaminatio n

o f th e air , surfac e an d ground wate r pose d b y lea d an d arseni c whic h was th e resul t o f th e slag

, dross

, an d dus t fro m

Printed on Recycled Papera

forme r coppe r an d lea d smeltin g operatio n an d calcin e derive d fro m th e roastin g o f arsenopyrite

.

Th e Sit e is the portio n o f OU 2 whic h i s an ol d cemeter y and provide s 1 ) direc t access t o visitors/trespasser s

in th e area s wher e hazardou s substance s exist , an d 2 ) airborn e migratio n o f hazardou s substance s fro m th e Site

. 

### 2

. Descriptio n

o f Threa t T h e forme r smelte r area , wher e th e Sit e i s located

, contain s a variet y o f heav y metal s tha t ar e considere d pollutant s o r hazardou s substance s a s define d b y Sectio n 101(14 } o f CERCL A becaus e th e "mixed smelte r waste " i n thi s are a ha s concentration s

o f hazardou s substance s fro m th e smelte r buildin g demolitio n debris

, tailing s (miscellaneou s

smelte r waste)

, calcine

, an d ba g dust

. Th e Sit e ha s visitor s t o th e cemeter y an d trespassers

. Th e semi-ari d climat e o f th e are a provide s a situatio n fo r th e hazardou s substance s and/o r contaminant

s on-sit e t o b e airborn e an d migrat e off-sit e durin g th e dry

, wind y days

. C

. Sit e Evaluatio n Result s A s a par t o f th e Midval e Sla g OU 2 Engineerin g Evaluation/Cos t

Analysi s (BE/AC)

,

th e Site wa s include d i n Phas e I an d Phas e I I investigation s

an d backgroun d stud y (EP A Contrac t No

. 68-W9-0032)

.

Th e EE/C A Summar y Repor t (May

, 1994 ) i s containe d i n thre e volumes an d i s availabl e i n th e Superfun d Record s Cente r fo r Regio n VII I EPA

. Th e analyse s demonstrat e tha t seriou s level s o f contaminatio n existe d a t th e cemeter y site , wit h lea d an d arseni c i n th e calcin e reachin g level s as hig h as 13,49 0 pp m an d 21,26 8 ppm , respectively

. I V

. RESPONS E INFORMATIO N A

. Situatio n O n Octobe r 31 , 1996 , th e EP A ERC S Contracto r mobilize d t o th e Sit e an d th e excavatio n wa s initiate d b y a cre w o f si x cleanu p technicians

,

a field clerk

, respons e management , and an industria l hygienist

. Excavate d materia l wa s transporte d t o OU 2 an d stockpile d i n a temporar y storag e area

. Dust suppressio n fo r th e stockpil e wa s provide d b y a wate r truck

, an d a fir e hydran t hos e wa s use d t o suppres s dus t fro m th e excavatin g machinery

. Surfactan t wa s used t o cove r th e stockpil e a t th e en d o f eac h workday

. Sit e wor k

wa s complete d and th e cre w demobilize d on Apri l 17
, 1997

.V

. COS T INFORMATIO N Amount

Cost

s Budgete d T o Dat e ERG S Contracto r $170,00 0

$197,00 0 TAT/STAR T

$ 60,00 0 $ 10,00 0 Contingenc y $

50,00 0 $ -0

- EP A S

37.94 0 S 10.00 0 Estimate d Fina l Cost s $317,94 0

$217,00 0 The abov e accountin g o f expenditure s i s an estimat e base d o n figure s know n t o the OS C a t the tim e thi s repor t wa s written

. Th e cost accountin g provide d i n thi s repor t doe s 

### not necessaril y represen t a n exac t monetar y figur e whic h the governmen t ma y includ e i n an y claim for cos t recovery

.