The water line should be PVC, which will not allow the product to penetrate into the water line. Also, if the line is 12” deep and you dig down 6” deep, then you should be fine as far as not hitting the water line.
You can use Dominion 2L to treat trees and shrubs for chinch bugs. Most people use a 5 gallon bucket or a large watering can to apply Dominion as a soil drench. You will need 0.1 to 0.2 fl. oz. (3 to 6 mL) of Dominion per foot of shrub height or 0.1 to 0.2 fl oz per inch of trunk diameter for trees. The amount of water that is used will vary depending on soil conditions and volumes that are easy for applicators to use. The minimum amount of water that should be used is 1 pint per foot of shrub height (or inch of trunk diameter for trees) but you may use 1 quart -1 gallon of water per foot of height (or inch of trunk diameter for trees) as well. Denser soils such as clay do not accept water as readily, so the lower volume of water is suggested. Since sandy soils can accept more water, using the higher volume of water is preferred. After the soil drench has been applied you should water it in with at least 1/2 inch of water. Note: Water simply acts as a carrier and it is important that even distribution of the product is achieved. Thus, more water may be used if the applicator feels runoff will not occur and proper penetration of the root zone is achieved. Insecticides applied to the soil are taken up by the roots and translocated throughout the tree or shrub. Root/soil drenches offer the advantage of requiring no special equipment to apply (other than a bucket or watering can). However, surface layers of organic matter, such as mulch or leaf litter, can bind the insecticide and reduce uptake. Before applying drenches, it is important to remove or pull back any mulch or dead leaves so the insecticide solution is poured directly on the mineral soil. It is also important to keep the soil around the tree or shrub moist for the next 7-10 days after applications to encourage uptake. We also recommend using a product with an active ingredient that is different than the soil drench for a foliage application while you are waiting for the Dominion to translocate through the ficus. Talstar P is the most popular choice for foliage application on ficus for white fly.
The Dominion 2L is not labeled to treat for stink bugs and we would not recommend using for this pest. We have put together an Overwintering kit that is just for stink bugs. This kit includes Demon WP insecticide with Cypermethrin, Eco PCO dust and a hand duster for easy application. You should treat once a month through November for best results
Dominion 2L is not in the form of crystals, it is a liquid concentrate. It is is labeled for white flies as a systemic control. It is not a fertilizer. We recommend for white fly control that you measure the height of shrubs and diameter of the trees and apply the solution as a soil drench. You can apply Talstar P for a foliar spray (on not edible trees and shrubs) while the systemic control is working for immediate control.
