This polrep summarizes the results of the EPA sampling performed in September 2009. The primary purposes of this event were to collect samples from residences who previously had lead levels greater than 15 microgram/liter and also to collect samples from the perimeter monitoring wells on Site. The OSC is using these results to monitor the need for emergency action. While on Site, EPA's contractor, TetraTech, also collected additional samples for analyses needed for the Site Investigation Report.
Monitoring Wells: Samples were collected from Wells #1 - #15 with the exception of #4, which is not on Site. Well #15 was recently installed to further characterize the groundwater in the southwest area of the Site. Well #15 is not located on the perimeter of the Site, but on the golf course near a pond on the southwest side of the golf course..
All well samples were tested for metals. The results for the contaminants of concern are listed below. The data package which contains all of the data for the wells for this sampling event can be found on the Site webpage under the "Documents" section.
Arsenic Levels in Monitoring Wells: Arsenic was detected in concentrations less than 10 microgram/liter in 12 of the 14 wells. Well #7 had a concentration of 10.7 microgram/liter of arsenic. The level of arsenic in Well #15 was 21.5 microgram/liter.
Beryllium Levels in Monitoring Wells: Beryllium was detected in a concentration of 13.0 micrograms/liter in Well #13. The maximum contaminant level for beryllium in public drinking water systems is 4 micrograms/liter. All other results for beryllium in the monitoring wells were less than 1.5 microgram/liter.
Chromium Levels in Monitoring Wells: The highest level of chromium detected was 2.7 micrograms/liter in Well #15. The EPA maximum contaminant level for chromium in public drinking water is 100 micrograms/liter. No monitoring well results exceeded this limit.
Lead Levels in Monitoring Wells: The highest level of lead detected in the monitoring wells was 1.6 microgram/liter in Well # 14. No lead level above 15 micrograms/liter was detected in any of the monitoring wells.
Mercury: Mercury was not detected in any of the monitoring well samples during this event.
Boron: The highest level of boron detected in the monitoring wells was 146 micrograms/liter in Well #2. This well is located on the interior of the golf course near a pond on the east side of the course. EPA does not have a maximum contaminant level for boron in public drinking water supply systems.
Surface and Sediment Samples
Surface and sediment samples were collected from the ponds on the golf course as well as a drainage ditch between the golf course and Murray Drive.
Eighteen surface water samples were collected.
Arsenic, beryllium, chromium, and mercury were not detected in any of the surface water samples. Lead was detected in one surface water sample in a concentration of 4.8 micrograms/liter. However, this level was less than the laboratory could accurately quantify. Boron was detected in all of the surface water samples. For 17/18 samples, results were generally consistent with results ranging from approximately 9.8 microgram/liter to 45 microgram/liter. One sample (SW-07) had a concentration of 473 microgram/liter. This sample was collected from a pond on the north side of the golf course.
Arsenic was detected in all but one of the sediment samples. The highest level of arsenic detected was 8.2 milligrams/kilogram.
Beryllium concentrations in sediment samples were all less than 1 milligram/kilogram.
Chromium was detected in all of the sediment samples. The highest level of chromium detected was 17.4 milligrams/kilogram.
Lead was detected in all of the sediment samples in concentrations ranging from 1-16.5 milligram/kilogram.
Boron was not detected in any of the sediment samples.
Residential Well Samples: Residential well samples were collected from six residences who had at least one finding of a lead result greater than 15 microgram/liter of lead. Results greater than 15 micrograms/liter of lead were found in two of the six residences during this event. Copper was also detected in several of the residential well results, although not in concentrations exceeding EPA's maximum contaminant level for public drinking water.
Concentrations of arsenic, beryllium, and chromium were all below EPA's Maximium Contaminant Levels for public drinking water systems.. These results have been provided to the residents.
The drinking water well at the Fire Station near the Site was also tested during this event as a background sample. This well had elevated levels of lead and copper. This well will be added to the quarterly sampling list.
Five offsite surface soil samples were collected during this event. However, this information was collected as part of the Site Investigation. The results will be incorporated into that report.
EPA will incorporate this information into the Site Investigation Report.
EPA will continue quarterly monitoring, pending residents' permission, of the drinking water wells which have had results of lead greater than 15 microgram/liter.
EPA will add two additional properties to the quarterly monitoring program, pending meetings with those residents.
The OSC is working with toxicologists from the Agency for Toxic Substances and Disease Registry for recommendations for the residents with elevated levels of certain contaminants.
Monitoring well, surface water, and sediment results are posted on the main page of this website under the "Documents" section.
These September results, along with past results, will be summarized and expanded upon in an upcoming Site Investigation Report being prepared by EPA. The report is in the process of being finalized.