Record of Decision System (RODS)
|Site Name:||SPARTA LANDFILL|
|Address:||10322 ALPINE AVENUE|
|City & State:||SPARTA TOWNSHIP MI 49345|
|NPL Status:||Currently on the Final NPL|
|ROD Type:||Record of Decision|
From approximately the 1940s through 1977, Sparta Landfill operated as an open dump/landfill for municipal refuse and industrial wastes. Beginning in 1977, the Kent County Health Department detected groundwater contamination near the site. In August 1979, the Michigan Department of Natural Resources (MDNR) detected organic solvents in samples from on-site monitoring wells as well as from nearby residential wells. Kent County installed four water supply wells for the residents located southwest of the site. The original water wells were screened in the upper aquifer at depths ranging from 17 to 45 feet deep. The new wells, which were approximately 245 to 280 feet deep, were cased into the underlying bedrock.
The MDNR performed a hydrogeological investigation in 1981 and 1982. Nine monitoring wells were installed during this investigation. Several rounds of groundwater samples were collected from 1982 through 1986 by the MDNR. Volatile Organic Compounds (VOCs) were detected in the on-site monitoring wells; however, the data was not generated using U.S. EPA's Level IV Data Quality Objectives (DQOs). As a result, historical data was not presented in the Remedial Investigation (RI).
In May 1992 and July 1993 groundwater samples were collected from on-site monitoring wells. The July 1993 sampling also included the collection of three surface water samples and three residential well samples.
On September 23, 1993, Kent County Department of Public Works (KCDPW) signed a Consent Order with the U.S. EPA to determine the potential threat to the public health caused by the release of contaminants from the Sparta Landfill. Under the presumptive remedy of the Consent Order, the KCDPW agreed to "cap" the landfill prior to initiating the Remedial Investigation in accordance with a February 7, 1994, MDNR Administrative Order of Consent. The KCDPW submitted construction plans for the Sparta Landfill capping project to the MDEQ on April 24, 1995. The cap was designed substantially in accordance with Act 641. The MDEQ completed their review on June 8, 1995 and authorized the KCDPW to proceed with the capping project.
A flexible membrane liner system was installed in August 1995. This consisted of a passive gas system buried in a minimum of six inches of sand covered by layer of bentonite mats. A 30-mil PVC fused joint liner was installed over the bentonite liner. For added protection and drainage, an eight-ounce geotextile fabric was placed over the PVC liner. The liner system was covered with a minimum of two feet of permeable soils and then six inches of topsoil. In late September and early October, the entire cap was seeded with a mixture of grasses for soil stabilization.
In January 1991, the site was partially fenced and warning signs posted. Due to heavy rains in the fall, the installation of the permanent chain-link fence, which surrounds the landfill, was not completed until February 1996. On July 26, 1996, the MDEQ accepted the capping project as complete.
The RI was conducted in 1996. Groundwater samples were collected during the RI in May 1996. The results of the RI were presented in Groundwater and Surface Water Remedial Investigation Report of the Sparta Landfill Site. The Focused Feasibility Study (FFS) was submitted to U.S. EPA in August 1999. The purposes of the FFS were to identify and evaluate potentially applicable remedial alternatives for the site. The FFS report evaluated three alternatives: (1) no further action; (2) groundwater monitoring; (3) groundwater extraction and treatment. Alternative (1) described in the FFS is the same alternative that was recommended in the proposed plan and the alternative that is selected in this ROD. The RI and FFS reports were approved by U.S. EPA in September 2000.
Alt 1: No Further Action Alternative
The lead agency has determined that no further action with groundwater monitoring is necessary to protect public health or welfare or the environment.
Estimated Capital Costs: Not Documented
Estimated Annual O&M Costs: Not Documented
Estimated Present Worth Costs: Not Documented
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