Accession Number : ADA337787

Title :   Laser Induced Fluorometry/Cone Penetrometer (LIF) Demonstration Plan

Descriptive Note : Documentation plan

Corporate Author : NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA

PDF Url : ADA337787

Report Date : MAY 1995

Pagination or Media Count : 15

Abstract : The Laser Induced Fluorometry (LIF) technologies to be demonstrated using the SCAPS CPT platform provide real-time field screening of the physical characteristics of soil and chemical characteristics of petroleum hydrocarbon contamination at hazardous waste sites. The current configuration is designed to quickly and cost-effectively distinguish hydrocarbon-contaminated areas from uncontaminated areas. Secondary to this primary attribute is the acquisition of geologic information, reduction of investigation derived waste, and other benefits. This capability allows further investigation and remediation decisions to be made more efficiently and reduces the number of samples that must be submitted to laboratories for analysis. The LIF systems to be demonstrated use a pulsed laser coupled with an optical detector to measure fluorescence via optical fibers. The measurement is made through a sapphire window on a probe that is pushed into the ground with a truck-mounted Cone Penetrometer testing (CPT). CPT and standard penetrometer testing (SPT) have been widely used in the geotechnical industry for determining soil strength and soil type from measurements of tip resistance and sleeve friction on an instrumented probe. The two LIF technologies to be demonstrated are (1) the nitrogen laser-based LIF sensor and support system currently being used in the Navy, Army, and DOE. (2) a tunable dye laser-equipped induced fluorescence system, the ROST system. The LIF methods provide data on the in situ distribution of petroleum hydrocarbons from the fluorescence response induced in the polycyclic aromatic hydrocarbon (PAH) compounds that are components of the petroleum hydrocarbon. The methods detect PAHs in the bulk soil matrix throughout the vadose, capillary fringe, and saturated zones.

Descriptors :   *LASER INDUCED FLUORESCENCE, *ENVIRONMENTAL ENGINEERING, REAL TIME, PENETROMETERS, SOIL MECHANICS, SOIL CHEMISTRY, PETROLEUM PRODUCTS, SOIL REMEDIATION.

Subject Categories : Industrial Chemistry and Chemical Processing
      Optical Detection and Detectors
      Solid Wastes Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE