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The javelin event is held on the field inside the track. This field is a rectangle measuring 100 meters by 64 meters, with a semicircle at each end.

Early modern Olympic javelins were designed so well that javelin throwers could throw them beyond the field and onto the track. This was obviously dangerous for runners! Possible solutions to this problem included redesigning the javelin so it wouldn't "float" so much and removing the 2 innermost track lanes.
If the area of the grass, before removing the innermost track lanes, is approximately 9615 square meters, how many square kilometers of grass are there?

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