California site study

DBCP appears to persist in soils for decades with a half-lifeof over a century (60. At one California site, DBCP was found to persist in top soil for nearly a decade after a single application (J). This study conducted in 1980 in the Parlier area showed DBCP contamination to a depth of 30 feet throughout the soil profile. The highest concentrations of DBCP were found in the clay and silt layers. DBCP findings in soil and ground water coincided with areas of high DBCP use. This has led State Board staff to conclude that past agricultural use is the most likely source of this widespread contamination. 

International Seismic Application Technology (ISAT), with headquarters in La Mirada, California, uses earthquake engineers to do site studies and to design seismic-restraint systems for plumbing, air-conditioning ducts, and electrical systems in buildings. 

Owens Lake. Owens Lake is a relatively small alkaH deposit in Southern California where small amounts of cmde trona are recovered and sold (30,31). Several feasibiHty studies with regard to expanding production at this site have been conducted over the years with negative results. 

In a study to determine the concentrations of pesticides in air collected during times of peak pesticide use in California, air samples were collected at applications sites and at locations adjacent to the application sites (Baker et al. 1996). Of the samples collected adjacent to the application sites, 50% had levels of methyl parathion greater than the detectable limit of 0.2 ng/m, while 21% had levels of methyl paraoxon... 

Zavarin and his associates have described detailed analyses of the terpenoid constituents of several species of fir. We can start with their study of A. amabilis collected throughout the range of the species (Zavarin et al., 1973). The Pacific silver fir occurs from southeastern Alaska to northern California at mid to higher elevations with a major contribution to the forest flora in coastal British Columbia, the Olympic Mountains (Washington), and in the Cascade Mountains in Washington and Oregon. It is represented in California in only a few sites in the north. Analysis of cortical terpenoids from over 100 trees from 15 sites revealed a comparatively... 

Table 2 represents a summary of the design of the chlorpyrifos re-entry studies. Five sites (three in California, one in Arizona, and one in Florida) were selected. The California orange harvesting and lemon tree pruning represented high crop re-entry activities, while the Florida tomato and... 

Cook, S. F. and R. F. Heizer (1965), Studies on the Chemical Analysis of Archaeological Sites, Publications in Archaeology, Vol. 2, Univ. California, Berkeley. 

Zecherle, G.N. (1990) The ribosomal location and conformation of Escherichia coli protein L7/L12 studied by cysteine site directed mutagenesis and crosslinking. Doctoral Dissertation. University of California at Davis. 

The experimentation in the field of gas cloud fires appears to be limited. The unique set of large-scale experiments that involve the release, dispersion, ignition, and combustion of flammable natural gas clouds in the open air is that with the code name Coyote. Coyote series trials conducted by LLNL in 1983 at California s Nevada Test Site, Nevada provided an integrated dataset for use in validation studies [64,65]. The objective of the experiments was to determine the transport and dispersion of vapors from LNG spills, and in addition to investigate the damage potential of vapor cloud fires. Transient simulations... 

FIGURE 3 Pairwise combinations of moths caught by a population of spiders (M. cornigera) at one site in California (Winchester, CA) and the number of spider individuals catching both species in a pair [from a study of six spiders whose prey was recorded for up to 1.5 years over a span of 5 years (M.K.S. and W. Icenogle, unpublished data)]. Cells surrounded by a border indicate pairs of moths that seem to be pheromonally incompatible—i.e., compounds that are necessary components in attractive blends for one moth species make blends unattractive for the other species (47). 

No information was located on any on-going studies on the fate and transport of bromomethane. However, two studies related to human exposure to bromomethane are being supported by the U.S. Department of Agriculture and conducted at the University of California, Davis. One project will analyze bromomethane residues on foods, and the second will quantitate exposure levels of field workers to bromomethane and develop appropriate procedures to minimize exposure from this source. Remedial investigations and feasibility studies at NPL sites that contain bromomethane will provide further information on environmental concentrations and human exposure levels near waste sites. 

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