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From: <br />Michael Carroll <mcarroll@sjgov.org> low <br />Sent: <br />Tuesday, December 03, 2013 8:06 AM <br />To: <br />Natalia Subbotnikova [EH] <br />Cc: <br />Robert McClellon [EH]; Jaime Perez <br />Subject: <br />FW: Erosion due to November Storm at Corral Hollow Landfill <br />Good morning Natalia, <br />For your records, here is the email I sent to Todd Del Frate of the Water Board yesterday regarding the erosion at <br />Corral Hollow Landfill. <br />Best regards, <br />Mike Carroll <br />From: Michael Carroll <br />Sent: Monday, December 02, 2013 1:19 PM <br />To: 'DelFrate, Todd@Waterboards' <br />Cc: Joyesh Chandra; Jaime Perez; Billy Baier; Dan Gambini <br />Subject: Erosion due to November Storm at Corral Hollow Landfill <br />.•i <br />This is to let you know that the storm on November 22 caused some erosion to the vegetative layer on the new <br />closure area at Corral Hollow, plus a few other areas. Apparently the storm was very intense, but short lived. <br />Most of the erosion occurred in the flatter part of the closure area which received run-on from surrounding areas: <br />the area leading to the Caltrans area, and in the Caltrans property itself. Erosion was usually about 6" deep, so the <br />closure membrane was not exposed. <br />We began repairs on the Tuesday before Thanksgiving, and they continue this week. In general, we will be flattening <br />the erosion areas, replacing the cover as needed with soil that contains some rounded rock, making those surfaces <br />that are more subject to surface water flow more erosion -resistant. We are also building small berms to direct <br />surface water more quickly into the concrete -lined drainage ditch to reduce the over-all flow that might be seen by <br />those areas. The drainage ditch adjacent to the newly -constructed access road will also need some work. <br />The erosion over the recent closure was completed at noon today. The remaining work, plus a few improvements, <br />should be done by the end of this week. <br />We will document the erosion and correction in our Annual Ground Water and Surface Water Report, due to you by <br />the end of January. <br />Best regards, <br />Mike Carroll <br />W. Michael Carroll, PE <br />Senior Civil Engineer, Public Works/Solid Waste <br />Phone (Direct): 209-468-8504 <br />