How do I remove Yosemite installation partition

I have a 2009 iMac with the primary OS disk being an SSD and the secondary disk as my Home drive. I downloaded Yosemite via the App Store but never installed it. Instead, I created a bootable installation USB stick in order to perform a fresh installation on this iMac. After successful "clean" installation to the primary SSD, I noticed there is an approximate 100GB partition on my secondary Home HD called, "Install OS X Yosemite". How do I remove this partition without affecting all the contents on my HD?
Thank you in advance.

Please open Disk Utility, select the primary drive entry (out-dented) then click on the Partition tab in the main window. Take a screenshot and post here.
To post screen shot do this:
Press COMMAND-SHIFT-4 which will change the cursor to crosshairs.
Hold down the mouse button and use the crosshairs to select the part of the screen you wish to capture.
Release the button and the image will be saved to your Desktop.
Click on the Camera icon in the toolbar of the forum message editor.
Drag the image onto the Choose File button and click on the Insert button.

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Hi,
Assuming E: is the Recovery Partition. Please try:
Right-click Computer > Manage > Storage > Disk Management, then right-click the graphic of the E partition and select Delete. The partition returns to Unallocated for a Primary Partition or Free Space if it‘s a Logical Drive within an Extended Partition. Delete the partition if it is an Extended partition.
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