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Page 3 of 20 <br /> Storm Water Management System Assessment <br /> Orono Truck Station <br /> East Pond <br /> Figure 2 shows the grading plan for the east retention pond. The inlet structure is a 15-inch HDPE pipe that <br /> drains into the retention pond from the north. The outlet control structure is an 18-inch corrugated metal <br /> standpipe connectetl to an 18" carbon steel pipe that flows approximately 60 feet to the southwest and <br /> discharges through a flared end section. Both the inlet antl the outlet drain onto rip rap for energy <br /> dissipation. The design pond bottom is at an elevation of 933, and the top of the standpipe is at an <br /> elevation of 938.65. No details were provided on the design of the standpipe, and it is unknown whether <br /> the opening at the top of the pipe is the only outlet designed for this pond. The outlet control structure is <br /> shown in Figure 3. <br /> �' � <br /> �r � � � �,°,.�� 'r� 'i � �4 <br /> ♦ � �, "�"�'�°j",.�r►''�`'ryr' � � ; �� �! <br /> �� �,.+�s �°�'4.„y, i � ti <br /> � 1 � <br /> 1 � � � t� �' <br /> � I/ <br /> ,+ t <br /> w..�� t .r+�"`�+' "4 ��, � <br /> Il� � . � � ���` <br /> ���'�c'�'��2 pw� `��.�rw � �'� �� <br /> �,�� R �_ �� <br /> _ "rs., .� � � � 1 <br /> cv�'�' � <br /> ��� s a+k � �" .a � � <br /> � e M. <br /> ���, � � ��,�p � <br /> � � 4 ._ � � � <br /> ., y �bq , � .�� A+��'� � Wa` <br /> rr�,a� x., �aV <br /> a4A �� <br /> t � �� <br /> ° S»�i <br /> � � �: <br /> ..( -N :W., �.. <br /> � �a� <br /> � 'y��, s <br /> . , myj*�.�F � � !H � � <br /> � n�Y s � <br /> � f {�f.,"�4 <br /> � � ..d <br /> . ,s�,�A ,,pc� ,�=s xwr ' �yA <br /> � ��' �� � ,� ����ti„ i� � � a Y�''a �i �, .r° '� °"� <br /> ca e9 � 1 �y <br /> .� � fi�� _ z:�+�7��`'��+ � ,� � �, � <br /> _ �,. , "���,�.. ,� �." �� f� W ° � A <br /> `. � <br /> � � <br /> ,� a w � <br /> .•�,•�{''��.e.r�w .s �'�� �4� �. � � �" � <br /> "� - � _ - •• � '� <br /> Figure 2—East Retention Pond Grading Plan <br />