How to do grounding/bonding for new meter/breaker panel (CSED)

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CA_Dad

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Location
Santa Clara, CA
I am upgrading/replacing the meter/main breaker panel.
As part of that I have already pulled a new #4 ground wire ~100 feet through the house to where the water line enters the garage.
And I've pounded in two ground bars into the ground.

My thought is that it'd be better to have one continuous wire going from the water line, through the panel (and connecting to the ground/neutral bus) and continuing on down to the ground bars.

But I think it will be difficult to run the wire through the panel's built in bus then have it make a 180 to go down through the bottom of the panel.
So my thought was I could get something like this:
http://www.homedepot.com/p/Square-D...u=100154050&ci_kw=&ci_gpa=pla&ci_src=17588969

and connect that to the neutral/ground bus.

That would give me a good connection to the neutral/ground bus - and the ground wire wouldn't have to have a sharp bend/kink in it.

If it matters, the new "CSED" that I'm installing is SC2040M200F
It will supply 3 subpanels (30A to pool equipment, 100A to house, 50A to A/C)
The existing ground wire is a #8 I think that I *think* connects to the house cold water, but not near the entrance to the house (It goes down into a wall near the kitchen sink and doesn't come out into the crawl space under the kitchen)

So -
am I better off doing two separate #4 wires - one going up and through the attic to the water line, while the other goes down to the ground rods?
Or better to use the neutral lug?
Or is there a different solution I should be using?

And should I reconnect the old #8 ground wire? (Seems like it wouldn't hurt anything - could only help)
 
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