At the end of April of 2009, EPA and its START Contractor, TetraTechEM, Inc. performed additional sampling as a follow-up to the 2008 sampling. Validated sampling results have been received.
EPA received sampling results from 6 residential wells and 12 monitoring wells on the golf course. All samples were submitted for inorganics analyses, including boron.
Of the six residential wells, four had lead levels exceeding 15 micrograms/liter of lead in the 2008 sampling event. The remaining two wells had previous sampling results greater than 15 micrograms/liter. All six residents granted EPA permission to sample. Wells were sampled for inorganics (metals) and boron.
One of the six residential wells had a lead level greater than 15 microgram/liter. This well was resampled during the week of June 26, 2009.
All residents have been sent copies of their results.
Twelve samples were collected from six locations from the monitoring wells on Site. The six locations each have two nested monitoring wells. Lead levels in the monitoring wells were all less than 1.0 microgram/liter. Arsenic levels in the monitoring wells did not exceed 5 micrograms/liter.
EPA will re-sample the residential wells tested in the April event in approximately 3 months. With the permission of the owner, EPA may also perform additional monitoring well testing.
The OSC requested assistance from the Agency for Toxic Substances and Disease Registry on the results from the 2008 sampling event. ATSDR concluded that none of the boron results detected in 2008 posed a public health concern. ATSDR also recommended further testing for residential wells with lead levels greater than 15 microgram/liter. The OSC is planning on performing this additional testing.
EPA will continue to coordinate with local and state officials.