DPH should consider changing the Massachusetts DPH will consider modification of the Water Resources basis of the geometric mean calculation of the geometric mean in calculation, as specified in 105 CMR Authority future regulatory amendments. 445.031, from the 5-most recent samples to all samples from the previous 30 days. The 30-day basis represents more of a long-term trend, especially for beaches sampled daily. This page is intentionally left blank. Appendix
DPH should consider changing the basis of the geometric mean calculation, as specified in 105 CMR 445.031, from the 5-most recent samples to all samples from the previous 30 days. The 30-day basis represents more of a long-term trend, especially for beaches sampled daily. Massachusetts Water Resources Authority DPH will consider modification of the calculation of the geometric mean in future regulatory amendments. This page is intentionally left blank. Appendix