Zoning Districts | Technical Terms and Land Use Definitions
378. Trophic state index. A classification system which uses algal biomass as the basis for classification which can be independently measured by chlorophyll a, Secchi depth, and total phosphorus concentration. 379. Trophic status. A classification which defines lake quality by the degree of biological productivity. 380. Ultimate roadway section. A designation by the City that the maximum roadway or intersection capacity has been reached and further right-of-way acquisition and/ or improvements are not feasible to increase peak hour vehicle capacity. 381. Underground storage tank (UST). A tank and any underground piping connected to the tank that has at least 10 percent of its combined volume underground and is used for the storage of hazardous substances. USTs are generally associated with industrial/commercial land uses and can be found at filling stations, airports, hospitals, automotive repair shops, industrial plants, residential areas and other facilities. The definition of UST does not include underground facilities for the storage or treatment of storm water or for the storage of nonhazardous substances, such as drinking water. 382. Use. Activity or function carried out on an area of land, or in a building or structure located thereon. Any use subordinate or incidental to the primary use on a site is considered an accessory use. 383. Utility facility. A facility for the distribution or transmission of services to an area, including, but not limited to:
b. Water pumping or treatment stations;
c. Electrical substations;
d. Water storage reservoirs or tanks;
e. Municipal groundwater well-fields;
f. Regional storm water management facilities;
g. Natural gas gate stations and limiting stations;
h. Propane, compressed natural gas and liquefied natural gas storage tanks serving multiple lots or uses from which fuel is distributed directly to individual users;
i. Sewer lift stations; and
j. Pipes, electrical wires and associated structural supports.
384. Vactor waste. Liquid or solid waste material collected from catch basins, retention/detention facilities or drainage pipes. 385. Vactor waste receiving facility. A facility where vactor waste is brought for treatment and storage prior to final disposal. 386. Variance. An adjustment in the application of standards of a zoning code to a particular property. 387. Vegetation. Any and all plant life growing at, below or above the soil surface. 388. Vocational school. establishments offering training in a skill or trade to be pursued as a career, including only uses located in SIC Industry Group Nos.:
a. 824 – Vocational schools; and
a. Telephone exchanges;
256 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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