2019-08-19-CONCOM-min - Laserfiche WebLink

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11 Mr. Beuttell and Ms. Kayersman discussed the curb on the roadways and the potential contradictions. Ms. Kayersman stated that the grading and surface areas have previously been approved as mill and overlay. Mr. Beuttell stated that he believes the applicant is taking more credit for impervious and pervious surface area than they should. Ms. Kayersman addressed the modelling of the soft ball field, stating that they used the center of the field for modelling purposes. Ms. Kayersman stated that the rainfall that falls onto the field does not require pre-treatment. Ms. Kayersman stated that the area for Class A fill has been provided for in details in their final submittal. Dye testing was completed on site. The water is outletted to a vernal pool in Lincoln. The calculations and designs were altered to show the peak rates and relocation of the discharge. The peer reviewer has reviewed the revised changes. Ms. Kayersman stated that the discharge points are existing. Stormwater standards are now all are being met. In regards to snow management, Ms. Kayeerman provided the letter from the snow removal company stating that they will abide by the Commission's wishes. Ms. Margie Brown from the National Park Service presented before the Commission as an abutter. Ms. Brown raised her concerns regarding the abutter notification portion of the process as well as the effects of the construction on the abutting Minuteman National Park. Ms. Kayersman stated that in regards to stormwater runoff that is directed to the National Park, the water previously was directed to park without treatment. There is now curbing and treatment for the water that is being directed to the park. The parking lot achieves the 80% TSS removal. Chairman Hamilton inquired about the astroturf and its relationship to runoff on behalf of Ms. Brown. Ms. Brown raised her concern regarding potential for floating particles. Mr. Roise stated that the infiltration system would theoretically catch all particles. There have been previously conducted studies regarding this issue. The materials used for turf have since been improved and there should be no concerns regarding the material on the turf fields. The crumb rubber for this field is coated in acrylic to accommodate for temperature in addition to capturing the remaining crumb rubber that may erode. Ms. Brown asked what would happen if they began to see if the material was found in the water resources in the park.