East New Haven(OU-4)

	The detection of large PCE concentrations (more than 200 micrograms per liter) in monitoring well BW-02 during the ESI/RI indicated the possibility of an unknown PCE source south (up-gradient) of BW-02. During 2000, an undeveloped area consisting of overgrown fields, ravines, and woods south of Orchard Street was designed as the East New Haven site (OU-4). The original area was east of Miller Street, south of Orchard Street and north of State Highway 100. The site is located roughly between the old city dump (OU-3) and downtown New Haven. Since the original OU4 area was designated back in 2000, more than 13 additional monitoring wells have been installed.
	Results obtained from installation of the additional monitoring wells indicates that the largest PCE concentrations in ground water were in monitoring wells west of Miller Street (west of the original OU4 area). In 2006, the USEPA refined the extent of OU4 to reflect the distribution of PCE in monitoring wells. This revised extent eliminates much of the former OU4 area east of Miller Street and now extends west to Maupin Avenue and south to Circle Drive. The revised OU4 area actually encompasses OU5 (old hat factory).
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The USEPA began a focused  remedial investigation of OU4 in 2003. Currently (2003), the ground-water monitoring network consists of 7 bedrock monitoring well ranging from 65 feet deep (BW-04A-S) to 530 feet deep (BW-07) and an unused well inside an industrial facility immediately northeast of OU-4. Moderate concentrations of PCE (15-30 micrograms per liter) have been detected in a small creek south of monitoring well BW-02. Large PCE concentrations (more than 150 micrograms per liter) have been detected in several bedrock monitoring wells in OU4. Several additional monitoring wells may be installed at OU-4 during 2003. The source of the PCE in OU4 is unknown at this time. A review of historic aerial photographs is being conducted to determine the location of possible disposal sites.

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Documents specific to Operable Unit No. 4

• Record of Decision (ROD) for Riverfront Superfund Site Operable Unit 4, New Haven Missouri Complete ROD document including figures and tables (PDF File 6.3 MB)  (Released March 2009)
• Final Feasability Study Rivervront Superfund Site, New Haven, Missouri Operable Unit 4, The Orchard Street/Maiden Lane Site (PDF file 2.61 MB) (Released November 2008)
• Proposed Plan for Riverfront Superfund Site Operable Units 4, New Haven, Missouri (PDF File 2.8 MB) (Released December 2008)
• Fact Sheet-Public Meeting and Comment Period Riverfront Superfund Site (PDF 32 KB)(Released December 2008)
• Human Health Risk Assessment Report (released July 2008)
• Fact Sheet-Operable Unit 4 Removal Acction Public Session, Riverfront Superfund Site, New Haven, Missouri (PDF 25KB) (released April 2007)

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