The town of Islip will have more work to do as it cleans up toxic debris dumped at Roberto Clemente Park.

The Department of Environmental Conservation confirms to News 12 it has reviewed Islip's plan to clean the Brentwood park.

In addition to the town's proposal to drill three wells to monitor groundwater, the DEC is requiring two additional wells be drilled.

The groundwater must be tested both before and after an estimated 50,000 tons of contaminated dirt is removed.

In a letter, the DEC has asked Islip to revise and submit a work plan. The plan must be approved by the DEC before work can begin.

Although some Long Island environmentalists applaud the DEC for the revisions to the town's cleanup plan, they say they are concerned because tests done in April at the toxic site have not yet been made public.

Islip says it has the test results from April, but because of the Suffolk district attorney's investigation into the dumping, they have not been able to release the data.

The town had no comment on the DEC's letter regarding its cleanup proposal.