35 Articles found
Hargis + Associates Inc Articles
-
Field Screening Methods for the Presence of DNAPL, Superfund Site, southern California
Characterizing the lateral and vertical extent at a Dense Non Aqueous Phase Liquid (DNAPL) impacted site can prove to be a challenging task. Field methods employed to verify the presence of DNAPL have included the use of down-hole Ultraviolet ...
-
Environmental forensics: courting science?
Forensics and hydrology are two terms that may not seem to go together well. To the uninitiated, this combination may evoke images of the crime scene investigation that ensues when some patsy goes into the drink wearing cement overshoes. Rather, the ...
-
Electromagnetic detection of a 410-km-deep melt layer in the southwestern United States.
A deep-seated melt or fluid layer on top of the 410-km-deep seismic discontinuity in Earth’s upper mantle, as proposed in the transition-zone ‘waterfilter’ hypothesis, may have significant bearing on mantle dynamics and chemical differentiation. The ...
-
Fold geometry model of Coyote hills segment of Puente hills blind-thrust system applied to interpretation of long-term water level data
Recent work by others along the Coyote Hills segment of the Puente Hills blind-thrust system has imaged the near-surface structural features generated by activity of that intrabasin fault. Published shallow seismic profiles near the south flank of ...
-
Natural attenuation: better than groundwater extraction?
Monitored natural attenuation (MNA) was evaluated and implemented in May 2000 as a replacement for groundwater extraction and treatment as the long-term remedy for a chlorinated ethene plume at a Superfund site in Washington (Lehmicke et al. 2000). ...
-
The historic water system of mission San Diego de Alcalá, San Diego County, California.
The Old Mission Dam and Flume is an historically significant system of water control structures on the San Diego River, San Diego County, California. The most conspicuous remnant of the system, Old Mission Dam, is located at the head of Mission ...
-
Sustainability of Arizona’s few remaining perennial streams.
Mother Nature made water simple. In general, water comprises a continuum in whatever phase or phases it may occur. If you take some here, you have less somewhere else. Arizona law does not readily account for this simple concept; rather it ...
-
Dynamics of nitrate & perchlorate in groundwater.
The Apache Powder Superfund Site is located in Cochise County, Arizona, approximately 50 miles southeast of Tucson. The site was listed on the National Priorities List pursuant to CERCLA in 1990. Principal groundwater chemicals of concern (COCs) ...
-
Groundwater/surface water interactions along the Curtiss reach of the San Pedro River.
A reach of the San Pedro River flows east of the Apache Powder Superfund Site and west of the Town of St. David in Cochise County, Arizona. As a result of the remedial investigations associated with the Superfund Site, this reach has been surveyed ...
-
CERCLA remedial and removal actions at historic waste disposal areas.
Apache Nitrogen Products, Inc. (ANP) has operated a nitrogen-based fertilizer and explosives manufacturing facility in rural Cochise County since 1921. Using a feedstock of anhydrous ammonia, current manufacturing processes produce nitric acid, ...
-
Wet water v. paper water: water management under the 1980 Arizona groundwater code.
The Arizona Groundwater Management Code was enacted in 1980 to address the trend of widespread groundwater depletion across the State. The Code limits withdrawals of groundwater within designated areas (known as Active Management Areas or AMAs) to ...
-
Start-up readiness of the Apache wetland.
The Apache Wetland was constructed in 1997 pursuant to a U.S. Environmental Protection Agency order to treat nitrate-contaminated groundwater within the Apache Powder Superfund Site. To date, the treatment facility is entering its fourth growing ...
-
An investigation and remediation of TNT contaminated soils.
An investigation and remediation of TNT contaminated soils and wastes was conducted at the Apache Powder Superfund Site in Cochise County, Arizona during 1999 and 2000. TNT contamination was most likely the result of salvage operations of World War ...
-
The use of shallow high resolution seismic reflection data to determine drilling locations at the Apache powder superfund site.
INTRODUCTION Groundwater contamination at the Apache Powder Superfund Site in Cochise County, Arizona includes dissolved nitrate-N and perchlorate. Past studies have determined that these contaminants migrate laterally from a perched zone ...
-
A dynamite job? Cleaning up trinitrotoluene waste at the Apache powder superfund site.
The clean up of trinitrotoluene (TNT) wastes and contaminated soils from an abandoned TNT salvage operation is underway at the Apache Powder Superfund Site in Cochise County. Clean-up operations involved an unexploded ordnance (UXO) survey, on-site ...
-
Dr. Hargis presents at Parma conference on aquifer risk & vulnerability
On September 22, 2005, Dr. Dave Hargis presented a paper titled, `Groundwater Degradation from Agricultural Pesticides in Volcanic Terrains – A Case History: Oahu, Hawaii.` The conference was the 2nd International Workshop on Aquifer Risk & ...
-
Dr. Leo Lehmicke presents paper at Battelle conference
In May, Dr. Leo Lehmicke presented a paper titled “Anaerobic Biodegradation of TCE in Groundwater Following In Situ Thermal Treatment” at the Battelle Conference in Monterey on Remediation of Chlorinated and Recalcitrant Compounds. The presentation ...
-
Dr. Leo Lehmicke, a nationally recognized microbiologist in the area of bioremediation, has joined Hargis + Associates, Inc.
Dr. Leo Lehmicke, a nationally recognized microbiologist in the area of bioremediation, has joined Hargis + Associates, Inc. His specific area of expertise is natural attenuation and enhanced bioremediation of chlorinated solvents. He helped develop ...
-
Dr. Leo Lemicke presents paper at Battelle bioremediation conference.
In June, Dr. Leo Lemicke presented a paper titled, `Natural Attenuation: Better Than Groundwater Extraction?` at the Battelle Bioremediation Conference in Baltimore.
-
Drs. Leonhart & Hargis present at international conference in Florence.
Drs. Leo Leonhart and David Hargis presented a paper titled `Groundwater/Surface Water Interactions Along the San Pedro River, Cochise County, Arizona, USA` on August 21, 2004. The presentation was made at the 32nd International Geological Congress ...