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Scientific Investigations Report 2008–5162

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

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Table 6. Statistical summary of nitrogen and phosphorus concentrations in water samples grouped by source, Park Avenue stormwater collection and detention system, South Lake Tahoe, California, water years 2006–07.

[The term “water year” means a 12-month period beginning October 1 and ending September 30. Sample collection sites described in table 1. Abbreviation: mg/L, microgram per liter; PA1, Park Avenue basin 1; n, sample count. Symbol: –, data not collected]

Statistic Nitrogen
(mg/L)
  Phosphorus
(mg/L)
Unfiltered Filtered Unfiltered Filtered
Stormwater inflow (PA1_inletA and PA1_inletB [n=22])
Mean 1,500 380 94
Minimum 390 79 30
Median 1,200 270 60
Maximum 7,400 1,500 380
Detention-basin water at PA1_stage (n=7)
Mean 1,500 570 48
Minimum 530 69 17
Median 890 380 43
Maximum 3,600 1,200 92
Stormwater outflow from PA1_out (n=7)
Mean 720 200 99
Minimum 220 66 27
Median 780 240 80
Maximum 970 310 260
Ground water at all 11 observation wells (n=95)
Mean 1,100 39
Minimum 82 3
Median 580 20
Maximum 7,700 420
Ground water upgradient of PA1 (n=28)
Mean 1,700 20
Minimum 82 3
Median 2,000 18
Maximum 4,600 61
Ground water downgradient of PA1 (n=64)
Mean 740 48
Minimum 82 6
Median 510 23
Maximum 7,700 420
All stormwater samples (n=37)
Mean 1,300 380 86
Minimum 220 66 17
Median 900 250 56
Maximum 7,400 1,500 380

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