The upper part of Page Mill (that belongs to San Mateo county) is covered in about 1" of loose gravel. The coverage starts right where there is a descent before that short nasty uphill at the top (near Montebello open reserve) and goes for about 1.3 miles. I'm not sure how long it will continue this way.
My friend and I rode our mountain bikes from Alpine to Pagemill to Russian Ridge yesterday, and he noticed they have white markers for potholes from the portion of Pagemill between Alpine and Skyline that still needs work.
and how is going to help repair the road surface on Page Mill?
The way chip seal works is they spray sticky tar on the road, then coat it with gravel. The gravel sticks to the tar and forms a coating. It sticks better after it's been driven on; the cars pack the gravel down. Sometimes they sweep up the left over gravel later, and sometimes they don't.
It is common on rural roads in NorCal. It's cheaper than asphalt paving and it holds up under rural use. Sometimes they use tar that melts in the summer sun and creates dangerous slick spots; that happened on Skyline a few years ago. The contractor had to come back and re-do it with better seal.
I climbed Page Mill yesterday. The new cheap-seal section has been swept and is reasonably hard and smooth, but there is still a lot of loose gravel. Be very careful when descending, especially that short steep section adjacent to Montebello OSP.