OS X 10.9.4 Mavericks: Waking Up Unprompted While Sleeping

I am running OS X 10.9.4 Mavericks on a 27-inch Mid 2011 iMac. Prior to upgrading to Mavericks, I would go to System Preferences_Energy Saver and set Display Sleep to 1 minute. This would keep the computer screen turned off at night, but would allow for backups with Carbon Copy Cloner to function. (My Computer Sleep setting is set to Never, Put Hard Disks to Sleep when Possible is checked, and the remaining two items Wake For Network Access and Start Up Automatically after a Power Failure are not checked.
However, after the Mavericks upgrade, my iMac wakes itself up without any prompting. This occurs when there are no other programs running. Even after putting the machine to Sleep from the Apple Tab, it still wakes itself up with no programs running, etc.
Does anyone have a solution to this problem.
I also checked the settings in System Preferences_Accessibility and the Voice Over, Captions, and Speakable Items settings are off.
After running the Terminal Application with the command line syslog |grep -i "Wake reason" I get the following results:
syslog |grep -i "Wake reason"
Aug 28 00:34:54 kernel[0] <Debug>: Wake reason: EHC2
My understanding is that this means that a USB connected device may be waking the system. Accordingly, I disconnected all USB devices (forgot the devices in USB Preferences), except for my Wireless Apple Trackpad. However, the same problem occurs.
Any suggestions would be much appreciated.
Kindest regards.

I've got the same thing going on. I've used the sleep option from the Apple Menu as well, but no dice. In the last day or two, I've been using just the power button to put it to sleep, so these results may reflect that:
9/2/14, 7:09:42 AM PDT   WakeRequests
PM scheduled RTC wake event: MaintenanceImmediate inDelta=3202.02
9/2/14, 8:03:16 AM PDT   DarkWake
DarkWake [CDN] due to RTC/Maintenance: Using AC
45 secs
9/2/14, 8:03:26 AM PDT
Summary- [System: SRPrevSleep kCPU] Using AC
9/2/14, 8:04:01 AM PDT   Sleep
Maintenance Sleep: Using AC
3217 secs
9/2/14, 8:04:03 AM PDT   SlowResponse
PMConnection: Response from com.apple.apsd is slow (powercaps:0x0)
          1987 ms
9/2/14, 8:04:03 AM PDT   WakeRequests
Clients requested wake events: [proc=mDNSResponder request=Maintenance inDelta=3203]
9/2/14, 8:04:03 AM PDT   WakeRequests
PM scheduled RTC wake event: MaintenanceImmediate inDelta=3203.01
9/2/14, 8:57:38 AM PDT   DarkWake
DarkWake [CDN] due to RTC/Maintenance: Using AC
45 secs
9/2/14, 8:57:48 AM PDT
Summary- [System: SRPrevSleep kCPU] Using AC
9/2/14, 8:58:23 AM PDT   Sleep
Maintenance Sleep: Using AC
3218 secs
9/2/14, 8:58:25 AM PDT   SlowResponse
PMConnection: Response from com.apple.apsd is slow (powercaps:0x0)
          1988 ms
9/2/14, 8:58:25 AM PDT   WakeRequests
Clients requested wake events: [proc=mDNSResponder request=Maintenance inDelta=3204]
9/2/14, 8:58:25 AM PDT   WakeRequests
PM scheduled RTC wake event: MaintenanceImmediate inDelta=3204.01
9/2/14, 9:52:01 AM PDT   DarkWake
DarkWake [CDN] due to RTC/Maintenance: Using AC
45 secs
9/2/14, 9:52:11 AM PDT
Summary- [System: SRPrevSleep kCPU] Using AC
9/2/14, 9:52:46 AM PDT   Sleep
Maintenance Sleep: Using AC
3216 secs
9/2/14, 9:52:48 AM PDT   SlowResponse
PMConnection: Response from com.apple.apsd is slow (powercaps:0x0)
          1998 ms
9/2/14, 9:52:48 AM PDT   WakeRequests
Clients requested wake events: [proc=mDNSResponder request=Maintenance inDelta=3202]
9/2/14, 9:52:48 AM PDT   WakeRequests
PM scheduled RTC wake event: MaintenanceImmediate inDelta=3202.00
9/2/14, 10:46:22 AM PDT DarkWake
DarkWake [CDN] due to RTC/Maintenance: Using AC
45 secs
9/2/14, 10:46:32 AM PDT
Summary- [System: SRPrevSleep kCPU] Using AC
9/2/14, 10:47:07 AM PDT Sleep
Maintenance Sleep: Using AC
3219 secs
9/2/14, 10:47:09 AM PDT SlowResponse
PMConnection: Response from com.apple.apsd is slow (powercaps:0x0)
          1994 ms
9/2/14, 10:47:09 AM PDT WakeRequests
Clients requested wake events: [proc=mDNSResponder request=Maintenance inDelta=3205]
9/2/14, 10:47:09 AM PDT WakeRequests
PM scheduled RTC wake event: MaintenanceImmediate inDelta=3205.01
9/2/14, 11:40:46 AM PDT DarkWake
DarkWake [CDN] due to RTC/Maintenance: Using AC
45 secs
9/2/14, 11:40:56 AM PDT
Summary- [System: SRPrevSleep kCPU] Using AC
9/2/14, 11:41:31 AM PDT Sleep
Maintenance Sleep: Using AC
5 secs
9/2/14, 11:41:33 AM PDT SlowResponse
PMConnection: Response from com.apple.apsd is slow (powercaps:0x0)
          1998 ms
9/2/14, 11:41:33 AM PDT WakeRequests
Clients requested wake events: [proc=mDNSResponder request=Maintenance inDelta=3202]
9/2/14, 11:41:33 AM PDT WakeRequests
PM scheduled RTC wake event: MaintenanceImmediate inDelta=3202.00
9/2/14, 11:41:36 AM PDT Wake
Wake [CDNVA] due to EHC1/HID Activity: Using AC
Total Sleep/Wakes since boot at 9/1/14, 4:55:32 PM PDT   :16
9/3/14, 2:13:00 AM PDT   Showing all currently held IOKit power assertions
   BackgroundTask                 0
   PreventDiskIdle                0
   ApplePushServiceTask           0
   UserIsActive                   0
   PreventUserIdleDisplaySleep    0
   InteractivePushServiceTask     0
   PreventSystemSleep             0
   ExternalMedia                  0
   PreventUserIdleSystemSleep     1
   NetworkClientActive            0
Listed by owning process:
   id=501 level=255 0x4=USB mod=9/1/14, 4:59 PM description=EHC1 owner=AppleUSBEHCI
   id=502 level=255 0x4=USB mod=9/1/14, 5:05 PM description=UHC4 owner=AppleUSBUHCI
   id=503 level=255 0x4=USB mod=9/1/14, 5:04 PM description=UHC6 owner=AppleUSBUHCI

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