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California GAMA Special Study: An isotopic and dissolved gas investigation of nitrate source and transport to a public supply well in California's Central Valley

Description: This study investigates nitrate contamination of a deep municipal drinking water production well in Ripon, CA to demonstrate the utility of natural groundwater tracers in constraining the sources and transport of nitrate to deep aquifers in the Central Valley. The goal of the study was to investigate the origin (source) of elevated nitrate and the potential for the deep aquifer to attenuate anthropogenic nitrate. The site is ideal for such an investigation. The production well is screened from … more
Date: April 14, 2010
Creator: Singleton, M. J.; Moran, J. E.; Esser, B. K.; Roberts, S. K. & Hillegonds, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sitewide monitoring at Agra, Kansas, June 2009.

Description: In 1985, carbon tetrachloride was discovered in the groundwater at Agra, Kansas, during routine sampling of public water supply wells. Two of Agra's four public water supply wells contained low but detectable levels of carbon tetrachloride; the concentrations in wells PWS-3 and PWS-4 exceeded the maximum contaminant level. These wells were removed from service in 1986, although they remain available for uses other than drinking water. Other public wells, outside the area of contamination, suppl… more
Date: January 14, 2010
Creator: LaFreniere, L. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Water and Energy Savings using Demand Hot Water Recirculating Systems in Residential Homes: A Case Study of Five Homes in Palo Alto, California

Description: This report summarizes a preliminary study aimed at estimating the potential of saving potable water, (and the electrical energy used to heat it), that is presently lost directly to the drain while occupants wait for hot water to arrive at the faucet (point of use). Data were collected from five single-family homes in Palo Alto, California. Despite the small sample size in this study, the results make a compelling case for retrofitting homes with hot water recirculation systems to eliminate unn… more
Date: November 14, 2002
Creator: Ally, M.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

TS LOOP NON-POTABLE PUMP EVALUATION

Description: This analysis evaluates the existing subsurface non-potable water system from the portal pump to the end of the water line in the South Ramp and determines if the pump size and spacing meets the system pressure and flow requirements for construction operations and incipient fire fighting capability as established in the Subsurface Fire Hazards Analysis (CRWMS M&O 1998b). This analysis does not address the non potable water system in the Cross Drift which is covered under a previous design a… more
Date: May 14, 1999
Creator: Goodin, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurement of methyl-tert-butyl-ether (MTBE) in raw drinking water

Description: In order to assess the pathways for human exposure to methyl-tert-butyl-ether (MTBE) and to understand the extent of MTBE contamination in watersheds, a purge and trap gas chromatographic mass spectrometric method to measure part-per-trillion (ppt) concentrations of MTBE in environmental waters was developed. A variety of California's raw drinking waters were analyzed. No detectable MTBE was found in deep groundwater (>1000 feet). However shallow groundwater ({approx}250 feet) contained MTBE… more
Date: October 14, 1999
Creator: Davisson, M L; Koester, C J & Moran, J E
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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