The Late Quaternary History and Groundwater Quality of a Coastal Aquifer, San Diego, California

Sengebush, Robert M.; Heagle, Dru J.; Jackson, Richard E.

doi:10.2113/gseegeosci.21.4.249

Cited by 30 publications

(7 citation statements)

References 30 publications

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“…Hydraulic head measurements in the USGS SDAQ well (Fig. 2, red dot) were 3-5 m above ground surface (reported from USGS data by [15]) suggesting artesian flow into SDR. Thus, aquifer water may interact with the modern water chemistry, affecting all four cycles.…”

Section: Study Areamentioning

confidence: 95%

Microbial Geochemistry of the Sulfur, Iron, Manganese, and Calcium Cycles in the San Diego River Watershed, Southern California USA

Robbins¹,

Quigley-Raymond²,

Lai³

et al. 2018

Preprint

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Microbial populations involved in forming the distinctive precipitates of the S, Fe, Mn, and Ca cycles in the San Diego River watershed reflect an interplay between mineralogy of the rocks in the watershed, sparse rainfall, ground- and surface-water anoxia, and runoff of high sulfate, treated imported water.  In the less developed headwaters, Temescal Creek tributary emerges from pyrite-bearing metamorphic rocks, and thus exhibits both an oxidized Fe and reduced S cycle.  In the middle reaches, the river moves through developed land where treated, imported high sulfate Colorado River water enters from urban runoff.  Mast Park surrounded by caliche-bearing sedimentary rocks is a site where marl is precipitating.  Cobbles in riffles in the river are coated black with Mn oxide.  When the river encounters deep-seated volcanic bedrock, it wells up to precipitate both Fe and Mn oxides at Old Mission Dam.  Then, directly flowing through caliche-laced sedimentary rocks, Birchcreek tributary precipitates tufa.  Further downstream, at a site that periodically receives full sunlight, a sulfuretum sets up during the summer when the river is deoxygenated.  Such a rich geochemistry results in activity of iron and manganese oxidizing bacteria, sulfur oxidizers and reducers, and cyanobacteria precipitating calcareous marl and tufa.

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Section: Study Areamentioning

confidence: 95%

Microbial Geochemistry of the Sulfur, Iron, Manganese, and Calcium Cycles in the San Diego River Watershed, Southern California USA

Robbins¹,

Quigley-Raymond²,

Lai³

et al. 2018

Preprint

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“…These are the Santee-El Monte and the Mission Valley basins [14]. Hydraulic head measurements in the U.S. Geological Survey (USGS) San Diego Aqua Culture (SDAQ) well ( Figure 2, red dot) were 3-5 m above ground surface [15] suggesting artesian flow into SDR. Thus, aquifer water may interact with the modern water chemistry, affecting all four ions.…”

Section: Study Areamentioning

confidence: 99%

“…Water chemistry for S, Fe, Mn, and Ca is reported in the figures and in Appendix A from our analyses, as well as published [18][19][20], and unpublished and online sources [7,10,[21][22][23][24][25][26][27][28][29]. Stable isotopes of oxygen and deuterium are reported [15] for the Mission Valley area (Figure 1).…”

Section: Water Chemistrymentioning

confidence: 99%

“…Mn concentrations measured in the USGS SDAQ well ( Figure 6, red dot) are in the thousands of ug/L (Appendix A). Artesian pressures were measured that would extend 3-5 m above ground surface (reported from USGS data by [15]). Therefore, leakage from the subsurface could supply in-stream Mn that then was precipitated on downstream riffles.…”

Section: Manganese Dynamicsmentioning

confidence: 99%

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Microbial Geochemistry Reflecting Sulfur, Iron, Manganese, and Calcium Sources in the San Diego River Watershed, Southern California USA

Robbins

Quigley-Raymond

Lai³

et al. 2018

Geosciences

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Microbial populations involved in forming the distinctive precipitates of S, Fe, Mn, and Ca in the San Diego River watershed reflect an interplay between the mineralogy of the rocks in the watershed, sparse rainfall, ground- and surface-water anoxia, and runoff of high sulfate, treated imported water. In the sparsely developed headwaters, the Temescal Creek tributary emerges from pyrite-bearing metamorphic rocks, and thus exhibits both an oxidized Fe and reduced S. In the middle reaches, the river moves through developed land where treated, imported high sulfate Colorado River water enters from urban runoff. Mast Park surrounded by caliche-bearing sedimentary rocks is a site where marl is precipitating. Cobbles in riffles along the river are coated black with Mn oxide. When the river encounters deep-seated volcanic bedrock, it wells up to precipitate both Fe and Mn oxides at the Old Mission Dam. Then, directly flowing through caliche-laced sedimentary rocks, Birchcreek tributary precipitates tufa. Further downstream at a site under a bridge that blocks sunlight, a sulfuretum sets up when the river is deoxygenated. Such a rich geochemistry results in activity of iron and manganese oxidizing bacteria, sulfur oxidizers and reducers, and cyanobacteria precipitating calcareous marl and tufa.

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“…The MVA supplied more than 2 million gallons per day for municipal needs before World War II (Sengebush et al ) and is being returned to use by the City. During a 72‐h pumping test at DB‐2 in March 2015, the MVA produced 20–26 µg TBA/L at 85 gpm.…”

mentioning

confidence: 99%

Comment on Exceptionally Long MTBE Plumes of the Past Have Greatly Diminished

Jackson¹,

Cross

2015

Groundwater

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The Late Quaternary History and Groundwater Quality of a Coastal Aquifer, San Diego, California

Cited by 30 publications

References 30 publications

Microbial Geochemistry of the Sulfur, Iron, Manganese, and Calcium Cycles in the San Diego River Watershed, Southern California USA

Microbial Geochemistry of the Sulfur, Iron, Manganese, and Calcium Cycles in the San Diego River Watershed, Southern California USA

Microbial Geochemistry Reflecting Sulfur, Iron, Manganese, and Calcium Sources in the San Diego River Watershed, Southern California USA

Comment on Exceptionally Long MTBE Plumes of the Past Have Greatly Diminished

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