We have received a number of RBCA reports where the certified groundwater professional has not conducted the sampling of plastic water lines located in actual contamination plumes. We consider this to be a serious report deficiency relating to risk determination and may cause the report to be rejected.
Actual plumes refer to both soil and groundwater plumes, for all chemicals of concern.
For nongranular bedrock sites, where the groundwater plume does not have to be defined, sample all lines within 200 feet of any point which exceeds a plastic water line target level. At a minimum, for nongranular bedrock sites, sample all lines within 200 feet of the suspected source.