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Record of Decision System (RODS)

KENTWOOD LANDFILL

Abstract

Site Name:  KENTWOOD LANDFILL
Address:  4900 WALMA AVENUE 
City & State:  KENTWOOD  MI  49512
County:  KENT
 
EPA ID:  MID000260281
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-91/155
ROD Date:  03/29/1991
Operable Unit(s):  01
 
Media:  DEBRIS GROUNDWATER LEACHATE
 
Contaminant:  VOCS, BENZENE, PCE, TCE, OTHER ORGANICS, METALS, ARSENIC, CHROMIUM, LEAD
 
Abstract:  THE 72-ACRE KENTWOOD LANDFILL SITE IS AN INACTIVE MUNICIPAL LANDFILL IN KENTWOOD, KENT COUNTY, MICHIGAN. LAND USE IN THE AREA IS PRIMARILY RESIDENTIAL AND RECREATIONAL. TWENTY-TWO RESIDENCES TO THE SOUTH AND EAST OF THE SITE USE GROUND WATER AS THEIR DRINKING WATER SUPPLY. LANDFILLING OPERATIONS AT THE SITE BEGAN IN THE 1950'S, AND CONTINUED INTERMITTENTLY UNTIL THE COUNTY CAPPED AND CLOSED THE LANDFILL IN 1976. THE SITE CONSISTS OF TWO MUNICIPALLY-OWNED LANDFILL AREAS; A LARGER ORIGINAL LANDFILL; AND A 20-ACRE SOUTHERN EXTENSION LOCATED SOUTH-SOUTHEAST OF THE ORIGINAL LANDFILL. BOTH LANDFILLS ARE CONSTRUCTED INTO THE UPPERMOST AQUIFER BENEATH THE SITE, AND AS A RESULT, THE LANDFILLED WASTES INCLUDING GARBAGE, RUBBISH, CONSTRUCTION, AND DEMOLITIONS WASTES ARE IN DIRECT CONTACT WITH THE UPPER AQUIFER GROUND WATER. SITE DISPOSAL RECORDS SHOW NO INDICATION THAT RCRA HAZARDOUS WASTES WERE PLACED INTO THE LANDFILLS. IN 1983, CONSTRUCTION OF A LEACHATE COLLECTION SYSTEM TO PUMP LEACHATE TO A PUBLICLY OWNED TREATMENT WORKS (POTW) WAS COMPLETED ON THE EASTERN SIDE OF THE ORIGINAL LANDFILL, HOWEVER, CONTAMINATION FROM LEACHATE IS STILL OF CONCERN. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE DEBRIS, GROUND WATER, AND LEACHATE ARE VOCS INCLUDING BENZENE, PCE, AND TCE; OTHER ORGANICS; AND METALS INCLUDING ARSENIC, CHROMIUM, AND LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES IMPROVING THE LANDFILL CAP TO INCLUDE GAS CONTROLS AND A LEACHATE COLLECTION SYSTEM; PUMPING AND PRETREATING GROUND WATER ONSITE ALONG WITH COLLECTED LEACHATE, AS NEEDED, BEFORE DISCHARGING TO A POTW; MONITORING SEDIMENT, GROUND WATER, SURFACE WATER, AND AIR; AND IMPLEMENTING INSTITUTIONAL CONTROLS INCLUDING DEED AND GROUND WATER USE RESTRICTIONS, AND SITE ACCESS RESTRICTIONS SUCH AS FENCING. IF FOR ANY REASON THE LEACHATE OR CONTAMINATED GROUND WATER CANNOT BE TREATED BY THE POTW, THESE LIQUIDS WILL BE TREATED ONSITE, WITH SUBSEQUENT ONSITE DISCHARGE TO SURFACE WATER. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $5,700,000, WHICH INCLUDES AN ANNUAL O&M COST OF $210,000 FOR YEARS 0-9, AND $200,000 FOR YEARS 10-30.

PERFORMANCE STANDARDS OR GOALS; CHEMICAL-SPECIFIC CLEANUP GOALS FOR GROUND WATER IN THE AQUIFER ARE BASED ON SDWA MCLS AND STATE STANDARDS INCLUDING BENZENE 1 UG/L (STATE), PCE 0.7 UG/L (STATE), TCE 3 UG/L (STATE), ARSENIC 0.02 UG/L (STATE), CHROMIUM 30 UG/L (STATE), AND LEAD 5 UG/L (STATE).
 
Remedy:  THE SELECTED REMEDY IS THE FINAL REMEDY FOR THE SITE. THE REMEDY ADDRESSES THE THREATS POSED BY THE LOW LEVEL THREAT WASTES AND CONTAMINATED GROUND WATER OF THE SITE. THE REMEDY EMPLOYS ENGINEERING CONTROLS TO CONTAIN THE LANDFILLED WASTE (LOW LEVEL THREAT WASTES) ON-SITE. THE REMEDY ALSO EMPLOYS TREATMENT OF CONTAMINATED GROUND WATER. THE LANDFILLS DO NOT HAVE A THREAT THAT CAN BE CLASSIFIED AS A PRINCIPAL THREAT.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE THE FOLLOWING;

GROUNDWATER;

* GROUNDWATER USE RESTRICTIONS;
* GROUNDWATER EXTRACTION FOLLOWED BY TREATMENT OF THE EXTRACTED CONTAMINATED WATER AT A POTW. EXTRACTED WATER WILL BE TREATED ON SITE TO MEET POTW PRETREATMENT STANDARDS IF NECESSARY, BEFORE BEING SENT TO THE POTW.

LEACHATE;

* A LEACHATE EXTRACTION SYSTEM WILL BE INSTALLED TO REDUCE THE AMOUNT OF LEACHATE IN THE LANDFILL. LEACHATE EXTRACTED WOULD BE TREATED AT A POTW. EXTRACTED LEACHATE WILL BE TREATED ON SITE TO MEET POTW PRETREATMENT STANDARDS IF NECESSARY, BEFORE BEING SENT TO THE POTW.

LANDFILL CONTENTS;

* LANDFILL CONTENTS WILL BE CONTAINED BY UTILIZING A RCRA SUBTITLE D TYPE CONSISTING OF (FROM BOTTOM UP) A 2-FOOT CLAY LAYER, TOPPED BY A 6-INCH LAYER OF TOPSOIL. GAS VENTING AND LEACHATE BREAKOUT COLLECTION WILL BE INCORPORATED INTO THE CAP DESIGN.
 
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