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U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5162
Version 1.1, December 2008

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Table 1. Information regarding data-collection sites used to investigate responses of shallow ground water receiving stormwater runoff from Park Avenue stormwater control system, South Lake Tahoe, California, 2005–07.

[Site locations are shown in figure 3 and 4. Site designations: The local identification is based on the rectangular subdivision of the public lands referenced to the Mount Diablo base line and meridian. Each number consists of three units. The first is the township, preceded by N to indicate location north of the base line. The second unit is the range, preceded by E to indicated location east of the meridian. The third unit consists of the section number and letter designating which is a unique number based on grid system of latitude and longitude of the site. For wells MW194-MW202, which are located in California, wells are numbered according to their location in the rectangular system for subdivision of public lands. Identification consists of the township number, north or south (N or S); the range number, east or west (E or W); and the section number. Each section is divided into sixteen 40-acre tracts lettered consecutively (except I and O) beginning with “A” in the northeast corner of the section and progressing in a sinusoidal manner to “R” in the southeast corner. Within the 40-acre tract, wells are sequentially numbered in the order they are inventoried. The standard identification consists of 15 digits: First six denote degrees, minutes, and seconds of latitude; next seven denote degrees, minutes, and seconds of longitude; and last two digits (assigned sequentially) identify sites within 1-second grid. If more precise latitude and longitude subsequently are determined, initial site-identification number is retained. The eight-digit numbers are station numbers that follow the “downstream-order system”: The first two digits, or part number, refer to the regional drainage basin (Part 10 is Great Basin). The following six digits are the downstream-order number, which is assigned according to the geographic location of the site in the drainage basin; larger numbers stations are downstream from the smaller number stations. Land-surface altitude: Vertical accuracy ±1.97 inches. Site type: SWI, stormwater inflow; DBG, detention basin gage; SWO, stormwater outflow; OBS, observation well; DOM, domestic well; LAKE, Lake Tahoe sample site. Abbreviation: NA, not applicable or not available]

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