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Skip Navigation LinksDNREC : Division of Waste & Hazardous Substances : Site Investigation & Restoration : Hercules Road and Lancaster Pike site cleanup project

 Hercules Road and Lancaster Pike site cleanup project


DNREC held a public hearing on the Proposed Plan of Remedial Action for the Hercules Road and Lancaster Pike cleanup project on Jan. 18, 2012.  In addition, DNREC held a public information session on December 14, 2011, where DNREC representatives received questions and comments.

The 18th hole of the Delaware National Golf Course looking north - where remediation is plannedDNREC has approved the Remedial Investigation Report and completed the Proposed Plan of Remedial Action.   


The Hercules Road and Lancaster Pike Site is the present location of the Delaware National Golf Course. The prospective developer, Toll Brothers, Inc., has applied to construct new houses on the property. Toll Brothers is enrolled in DNREC’s Voluntary Cleanup Program to investigate and remediate the presence of pesticides and other hazardous substances in the golf course maintenance shed, storage areas,  and throughout the property.

Hercules Road and Lancaster Pike Site (DE-1492)
on Delaware Environmental Navigator (DEN)
Includes complete project file. 

Site Investigation and Restoration Branch's
Voluntary Cleanup program

Hercules Golf Course Technical Assistance page

PHOTO: The 18th hole of the Delaware National Golf Course facing north –
where remediation is planned before construction of new houses
can move forward on the site.

Portions of the site are adjacent to two facilities subject to regulation under the Resource Conservation and Recovery Act.  The former Aqualon facility is located west of the golf course property. It was investigated with DNREC oversight in 2005-2006 and remediated in 2007 as part of the demolition. It is currently inactive. The former Hercules Research Center is located south of the golf course property.  In 1991, the US EPA identified four Areas of Concern and 16 Solid Waste Management Units on the facility, mostly on the eastern portion of the property. Those areas are at various stages of cleanup and  closure with DNREC oversight.DNREC 24-hour hotline

Toll Brothers submitted a remedial investigation work plan July 28 for DNREC review. Field work, including soil borings and well installations, began in early August after DNREC approval of the work plan. The field work is expected to continue for three weeks with completion of the report in mid-October.

The proposed scope of the field investigation includes 215 soil samples, 7 ground water samples, and 10 sediment samples. Soil sampling has been designed to evaluate potential hot spots, possible migration of contamination from surrounding properties, and the vertical and horizontal extent of pesticide contamination on greens, tees, and fairways.

Project updates 2011

June 6 - DNREC has been informed that the landowner will begin demolition of the clubhouse located on the former Delaware National Golf Course. Demolition should continue for approximately three weeks. This activity does not warrant oversight under DNREC’s Voluntary Cleanup Program.

March 31 - Consultants to Toll Brothers will be test pitting on the property this week to locate irrigation lines.

March 23 - Toll Brothers’ environmental consultant has performed several additional rounds of soil and groundwater sampling to compliment the field work begun last August.  DNREC expects a draft submission of the complete data in April.

Project updates 2010

December 1 - BrightFields, environmental consultant to Toll Brothers, will be on the property this week to collect additional soil, sediment and groundwater samples from areas of the property identified through the August sampling round. 

The DNREC Solid and Hazardous Waste Branch is overseeing corrective action at the former Hercules Research Center adjacent to the golf course.  The activity along the Red  Clay Creek is visible from the Wilmington and Western Railway. Please address any questions regarding this project to Doug Zeiters at 302-739-9403.

August 18 - Toll Brothers' environmental consultant completed field work for the remedial investigation Aug. 17.  All samples, including groundwater samples from seven new monitoring wells, are at the laboratory for analysis.

August 9 - BrightFields, Toll Brothers' environmental contractor, completed the installation of new wells last week.  Sediment samples are being collected today. Hand-auger sampling to delineate contamination on greens, tees, and fairways will begin tomorrow.

August 4 - Field work is going smoothly.  The direct-push soil borings and monitoring wells should be completed tomorrow.  The new wells will be developed by the end of the week. Hand auger borings and sediment sampling will continue into next week.

August 3 - Field work at the site is under way.The approved remedial investigation work plan is viewable on the Delaware Environmental Navigator (DEN).

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