Ward Construction provides services in the greater San Francisco Bay Area including, Oakland, Berkeley, Richmond, San Francisco, Walnut Creek, Lafayette, Orinda, Moraga, Hayward, Marin and other East Bay and North Bay cities.
Here\’s an example of the type of services provided:
We will construct a drainage system along the front, left, and rear sides of the home. The system will start at the front of the home adjacent the left side of the garage with a trench 30 inches deep. From here it will extend along the front to the left corner, the left side to the rear corner, (including both sides of the living room slate porch), and along the rear to the right corner.
The drainage system consists of two pipes in a rock filled trench. One is perforated, to collect sub-surface water and the other is non-perforated, to collect water from the roof downspouts. At the upper end or start of both lines, as well as at the major corners, a clean out will be provided so that both lines can be tested or cleaned as necessary.
The minimum depth for the perforated pipe will be below the grade of the soil under the house and both the perforated and non-perforated pipe will fall at least 1/8 inch per foot for the total length of the system to the point of discharge.
The perforated pipe will be installed on top of a bed of gravel, two inches deep, with the perforations pointed down. The trench will then be then backfilled with drain rock. The rock we recommend is Class I, Permeable Type A drain rock per the California State Specifications. The drain rock is clean gravel that varies in size from 1/4 to 1/2 inch.
The trench will be a minimum of 12 inches wide. This permits a four-inch blanket of rock on each side of the four inch perforated pipe.
The system will discharge into either the existing 4 inch discharge pipe if it is deep enough, or the concrete storm drain pipe that runs along the right side of the residence.
The owners to remove all plants along the path of the drain they wish saved, with the exception of the Rhododendron at the rear of the residence that we will go around.