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A Grading and Drainage certificate should have been issued by the permitting authority along with an affidavit by the contractor performing the work ensuring the work was in compliance with the approved plans.
Since you are not getting satisfaction from your builder, I would take all of your documentation to your city or county permit office (call ahead to determine who to speak with). Standing water in any developement is unnaceptable and the municipality may require them to fix it.
If the local governement can't help, contact an attorney specializing in land or propery law and ask them to send a letter to the builder. Spending a few hundred dollars for this may go a long way. If you have to go to court, I would do so.
My neighbors and I had sanding water and grading problems that we were able to demonstrate to the builder, and the builder came out and put drains in, no questions asked. We did not have to go to the county or hire an attorney. They recognized the problem and fixed it.
The biggest issue we run into is not having enough black dirt (quality soil) on on hand. Trucking in more soil can add thousands of dollars, and it's not often evident at the start of construction or remodeling.
You can install a flexible downspout extension on your downspout that is next to your front step and run it behind your bush out past your mulch to keep the water from washing your mulch away. You can buy the flexible downspout extensions at Lowes or Home Depot.
What is the water source? It looks like it is coming from a drain pipe behind a shrub? I would recommend relocating that to dump to a different location. No matter what type of edging you install on the bed with the mulch, a massive amount of water from that down pipe will cause some overflow and mess. Maybe you can incorporate a stone trail where the water flows, if you can't relocate the down pipe. Ideally, I'd want to see the drain pipe go under the side walk, and out by the grass, or if its by a garage, down the driveway.
Using warm soapy water is the best for daily cleaning. There are many granite cleaners on the market that will help you if you really want to scrub and bring back that original shine. Laticrete (formerly DuPont) stone care products are great. They make a revitilizer spray that is excellent for weekly cleaning. It has a bit of sealer in it as well, so it will help keep those tops shiny.
We use and reccommend TS&G Disinfectant & Cleaner. It is made by MIRACLE Sealants Company and you can use it safely on Tile, Stone, & Grout. It kills Molds & Mildew, Disinfects, Bacterial, Fungicidal, Cleanses, Deoderizes, & Eliminates Oders.
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