N., and Bakry, N. M. (2006)

Chem Codes: Chemical of Concern: DZ Rejection Code: EFFLUENT.

Walter, Anne, Suchy, Susan E., and Vinson, Phillip K. (1990). Solubility properties of the alkylmethylglucamide surfactants. Biochimica et Biophysica Acta (BBA) - Biomembranes 1029: 67-74.

Chem Codes: Chemical of Concern: DZ Rejection Code: METHODS.

The critical micelle concentration (CMC) and the ability to solubilize and form vesicles from phospholipids are important criteria for the selection of a surfactant for reconstitution protocols. The CMC and its temperature dependence were determined for an homologous series of alkylmethylglucamides (MEGA-8, MEGA-9, MEGA-10). Each detergent was added continuously from a concentrated solution to a saline buffer with the environment-sensitive fluorescent probe ANS, held in a thermojacketed cuvette; ANS fluorescence increases at the CMC. The CMCs at 25[deg]C were 51.3, 16.0 and 4.8 mM for MEGA-8, MEGA-9 and MEGA-10. The free energy change for transfer to a micellar environment per -CH2- was -740 cal/mol, similar to other alkyl series. The CMCs decreased slightly with increasing temperature (T = 5-40[deg]C) for MEGA-9 and MEGA-10 while that of MEGA-8 was virtually insensitive to temperature in this range. MEGA-9 solubilization of egg PC in aqueous solutions was determined as a function of [PC] and temperature. The lamellar-micellar phase boundaries were determined by simultaneous 90[deg] light scattering and the resonance energy transfer using the headgroup labeled lipid probes NBD-PE and Rho-PE. The [MEGA-9] at solubilization was linear with [PC]; the MEGA-9 to egg PC ratio in the structures at optical clarity was 2.3 while the monomeric [MEGA-9] was 14.3 mM or slightly lower than the CMC at 25[deg]C. Solubilization of egg PC by MEGA-9 was somewhat more temperature-dependent than the CMC of this detergent. Vesicles formed from MEGA-9 tended to be multilamellar. MEGA-9 is clearly different from octyl glucoside, despite its chemical similarity, in terms of its temperature sensitivity and vesicle forming characteristics. Nonionic surfactant/ Alkylmethylglucamide

Wan, H. B., Lan, W. G., Wong, M. K., and Mok, C. Y. (1994). Orthogonal Array Designs For The Optimization Of Liquid Chromatographic Analysis Of Pesticides. 289: 371-380.
Chem Codes: Chemical of Concern: CHLOR,CLNB Rejection Code: CHEM METHOD.

biosis copyright: biol abs. rrm research article asulan simazine isoprocarb fenobucarb methyldymron devrino isoprothiolane mepronil flutolanil diazinon thiobencarb aprodione terbutol isofenphos pencycuron butamifos prowl dursban balan dichlorvos thiram pyridaphenthion chloroneb pronamide chlorothalonil etridiazole bensulfite tolclofos isoxathion water sample analytical method ecology/ environmental biology-general/ methods/ ecology/ environmental biology-limnology/ biochemical methods-general/ biochemical studies-general/ biophysics-general biophysical techniques/ toxicology-environmental and industrial toxicology/ public health: environmental health-sewage disposal and sanitary measures/ public health: environmental health-air, water and soil pollution/ pest control, general/ pesticides/ herbicides

WAN MT, SZETO, S., and PRICE, P. (1994). Organophosphorus insecticide residues in farm ditches of the Lower Fraser Valley of British Columbia. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES; 29: 917-949.
Chem Codes: Chemical of Concern: DMT Rejection Code: NO SPECIES.

BIOSIS COPYRIGHT: BIOL ABS. Farm ditches flowing into three important rivers in the Lower Fraser Valley of British Columbia, Canada, were sampled periodically at seven locations from July to December in 1991, to determine the occurrence and levels of seven organophosphorus (OP) insecticides. Based on sales records for the year, the uses of OP insecticides in this area were as follows: malathion > diazinon > parathion > dimethoate > azinphos-methyl > fensulfothion, but no sales of chlorfenvinphos. Residues of parathion, diazinon, fensulfothion, dimethoate and chlorfenvinphos were detected at levels ranging from 1 - 7,785 mug/kg in cropped soils collected from areas adjacent to the sites for sampling ditch water and sediments. Malathion and azinphos-methyl were not detected in any of the substrates studied, demonstrating their rapid degradation in the environment. Diazinon and dimethoate were consistently found in ditch water at seven locations, with an average concentration of 0.07 m Animals/ Ecology/ Ecology/ Fresh Water/ Biochemistry/ Plants/Growth & Development/ Soil/ Soil/ Herbicides/ Pest Control/ Pesticides

WAN MT, SZETO, S., and PRICE, P. (1994). Organophosphorus insecticide residues in farm ditches of the Lower Fraser Valley of British Columbia. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES; 29 917-949.
Chem Codes: Chemical of Concern: DZ Rejection Code: FATE.

BIOSIS COPYRIGHT: BIOL ABS. Farm ditches flowing into three important rivers in the Lower Fraser Valley of British Columbia, Canada, were sampled periodically at seven locations from July to December in 1991, to determine the occurrence and levels of seven organophosphorus (OP) insecticides. Based on sales records for the year, the uses of OP insecticides in this area were as follows: malathion > diazinon > parathion > dimethoate > azinphos-methyl > fensulfothion, but no sales of chlorfenvinphos. Residues of parathion, diazinon, fensulfothion, dimethoate and chlorfenvinphos were detected at levels ranging from 1 - 7,785 mug/kg in cropped soils collected from areas adjacent to the sites for sampling ditch water and sediments. Malathion and azinphos-methyl were not detected in any of the substrates studied, demonstrating their rapid degradation in the environment. Diazinon and dimethoate were consistently found in ditch water at seven locations, with an average concentration of 0.07 m Animals/ Ecology/ Ecology/ Fresh Water/ Biochemistry/ Plants/Growth & Development/ Soil/ Soil/ Herbicides/ Pest Control/ Pesticides

WANG C-K and LEE S-E (1997). Evaluation of granular activated carbon adsorber design criteria for removal of organics based on pilot and small-scale studies. WATER SCIENCE AND TECHNOLOGY; 35 227-234.
Chem Codes: Chemical of Concern: DZ Rejection Code: METHODS.

BIOSIS COPYRIGHT: BIOL ABS. The major objective of this research is to determine engineering GAC adsorber design criteria for removal of various organic contaminants found in the 3 drinking water sources in the Keum river basin. Dissolved Organic Carbon (DOC) and UV absorbance at 254 nm were chosen as parameters for overall organics level in raw and treated water. Removal of micropollutants including organophosphorus pesticides, MBAS, volatile organic chemicals (VOCs), phenol and NH3-N were also taken into consideration in bench and/or pilot studies. Treatment efficiencies for target contaminants in three different pilot plants with different raw water quality in the same Keum river basin were compared. Identification and decision of the treatment objectives were found to be important factors for determining design parameters such as GAC bed depth. Range of appropriate bed depth and reactivation frequency for different treatment levels were suggested based on pilot studies. Biochemistry/ Biophysics/ Macromolecular Systems/ Molecular Biology/ Sanitation/ Sewage/ Air Pollution/ Soil Pollutants/ Water Pollution

Wang, Qiquan and Lemley, Ann T. (2002). Oxidation of diazinon by anodic Fenton treatment. Water Research 36: 3237-3244.
Chem Codes: Chemical of Concern: DZ Rejection Code: METHODS.

Anodic Fenton treatment (AFT) is a new technology that has several advantages over classic Fenton treatment and electrochemical Fenton treatment. The oxidation of diazinon by AFT using different electrolytes has been investigated. NaCl, KCl and Na2SO4 show similar effects on the extent and rate of oxidation, and the data can be fitted quite well by the AFT kinetics model. Use of NaNO3 as the electrolyte causes low-efficiency electrolysis and a subsequent low oxidation rate for diazinon. The NaCl concentration level in the anodic half-cell and the concentration ratio between the two half-cells is optimized at 0.04 M and 4:1 (cathodic/anodic), respectively. The activation energy of diazinon oxidation by anodic Fenton treatment is estimated to be 12.6+/-0.6 kJ mol-1, which is less than half of that for aqueous chlorine treatment. Diazoxon is the intermediary oxidation product. The oxidation of diazinon as a formulated product has also been investigated. Its dissipation kinetics can also be fitted quite well by the AFT model. Compared with the oxidation of pure diazinon, the oxidation rate of formulated diazinon is much lower, an indication that many formulation ingredients compete with diazinon for reaction with the hydroxyl radical. Fenton treatment/ Diazinon/ Oxidation/ Pesticide/ Anodic

Wang, Zhong-Xia, Chai, Zuo-Yun, and Li, Ye-Xin (2005). Reaction of aryl azides with tris(trimethylsilyl)silyllithium: Synthesis of tmeda or thf adducts of [Li{N(Ar)Si(SiMe3)3}] and 1,4-trimethylsilyl migration from oxygen to nitrogen. Journal of Organometallic Chemistry 690: 4252-4257.
Chem Codes: Chemical of Concern: DZ Rejection Code: METHODS.

Reaction of ArN3 (Ar = Ph, p-MeC6H4, 1-naphthyl) with [Li{Si(SiMe3)3}(thf)3] yielded lithium amides [Li{N(Ar)Si(SiMe3)3}L] (L = tmeda or (thf)2). Similar treatment of o-phenylene diazide with 2 equiv. of [Li{Si(SiMe3)3}(thf)3] formed dilithium diamide complex 4. Reaction between o-Me3SiOC6H4N3 and [Li{Si(SiMe3)3}(thf)3] afforded, via 1,4-trimethylsilyl migration from oxygen to nitrogen, [Li{OC6H4{N(SiMe3)Si(SiMe3)3}-2}]2 (5). The structures of complexes 3 and 5 have been determined by single crystal X-ray diffraction techniques. Tris(trimethylsilyl)silyllithium/ Aryl azides/ Reaction/ Lithium amides/ Trimethylsilyl migration

WARD MP and ARMSTRONG, R. TF (1998). Pesticide use and residues on Queensland wool. AUSTRALIAN VETERINARY JOURNAL; 76 739-742.
Chem Codes: Chemical of Concern: DZ Rejection Code: FATE.

BIOSIS COPYRIGHT: BIOL ABS. Objective: To determine practices for control of louse infestation and blowfly strike in Queensland sheep flocks that are associated with organophosphorous and synthetic pyrethroid residues on wool. Design: Information on residues was obtained from a survey of Queensland wool clips. Information on pesticide use was obtained from a trace-back postal survey. The association between pesticide use and residues was assessed using generalised linear models, controlling for potential confounding by flock location. Procedure: Between 1995 and 1997 Queensland wool clips were randomly sampled. Samples were tested for the presence and amount (mg per kg of greasy wool) of organophosphorous and synthetic pyrethroid pesticides. A questionnaire seeking information on flock characteristics and pesticide use was sent to the manager of each flock from which a wool sample was tested. Results: The median amount of OP and SP residue was 0.8 and 0.25 mg/kg, respectively, and 91 and 95% of wo Diagnosis/ Skin/ Animal Husbandry/ Animal/ Animals, Laboratory/ Animals, Wild/ Parasitic Diseases/Veterinary/ Artiodactyla

Ward, R. J., Palmer, M., Leonard, K., and Bhakdi, S. *. (1994). Identification of a putative membrane-inserted segment in the alpha -toxin of Staphylococcus aureus. Biochemistry (Washington) [BIOCHEMISTRY (WASH.)]. Vol. 33, no. 23, pp. 7477-7484. 1994.
Chem Codes: Chemical of Concern: DZ Rejection Code: METHODS.

ISSN: 0006-2960

Descriptors: segments
Descriptors: identification
Descriptors: cell membranes
Descriptors: Staphylococcus aureus
Abstract: To gain a fuller understanding of the regions of the Staphylococcus aureus alpha -toxin important in pore formation, we have used Foerster dipole-dipole energy transfer to demonstrate that a central glycine-rich region of alpha -toxin (the so-called "hinge" region) inserts deeply into the bilayer on association of toxin with liposomes. Mutant alpha -toxins with unique cysteine (C) residues at positions 69 and 130 were reacted with the C-specific flurophore acrylodan, which acted as an energy donor. The chosen acceptor was N-(7-nitrobenz-2-oxa-13-diazol-4-yl) 1,2-bis-(hexadecanoyl) sn-glycero-3-phos phoethanolamine (NBD-PE). Measurement of the degree of donor quenching with increasing NBD-PE in the inner bilayer leaflet enables the distance of closest approach between donor and acceptor to be estimated. For toxin labeled with acrylodan at position 130 (in the hinge region), this distance is approximately 5 angstrom, showing that the probe is close to the inner surface of the liposomes.
Language: English
English
Publication Type: Journal Article
Classification: X 24171 Microbial
Classification: A 01023 Others
Subfile: Microbiology Abstracts A: Industrial & Applied Microbiology; Toxicology Abstracts

Wardlow, L. R., Ludlam, F. A. B., and Hammon, R. P. (1975). A Comparison of the Effectiveness of Insecticides Against Glasshouse Whitefly (Trialeurodes vaporariorum). Ann.Appl.Biol. 81: 433-435.

EcoReference No.: 71321

Chemical of Concern: DDT,RSM,ES,HCCH,DZ; Habitat: T; Effect Codes: MOR; Rejection Code: TARGET(RSM,DZ).

Wasan, Ellen K., Harvie, Pierrot, Edwards, Katarina, Karlsson, Goran, and Bally, Marcel B. (1999). A multi-step lipid mixing assay to model structural changes in cationic lipoplexes used for in vitro transfection. Biochimica et Biophysica Acta (BBA) - Biomembranes 1461: 27-46 .

Chem Codes: Chemical of Concern: DZ Rejection Code: METHODS.

Formation of liposome/polynucleotide complexes (lipoplexes) involves electrostatic interactions, which induce changes in liposome structure. The ability of these complexes to transfer DNA into cells is dependent on the physicochemical attributes of the complexes, therefore characterization of binding-induced changes in liposomes is critical for the development of lipid-based DNA delivery systems. To clarify the apparent lack of correlation between membrane fusion and in vitro transfection previously observed, we performed a multi-step lipid mixing assay to model the sequential steps involved in transfection. The roles of anion charge density, charge ratio and presence of salt on lipid mixing and liposome aggregation were investigated. The resonance-energy transfer method was used to monitor lipid mixing as cationic liposomes (DODAC/DOPE and DODAC/DOPC; 1:1 mole ratio) were combined with plasmid, oligonucleotides or Na2HPO4. Cryo-transmission electron microscopy was performed to assess morphology. As plasmid or oligonucleotide concentration increased, lipid mixing and aggregation increased, but with Na2HPO4 only aggregation occurred. NaCl (150 mM) reduced the extent of lipid mixing. Transfection studies suggest that the presence of salt during complexation had minimal effects on in vitro transfection. These data give new information about the effects of polynucleotide binding to cationic liposomes, illustrating the complicated nature of anion induced changes in liposome morphology and membrane behavior. Liposome/DNA complex/ Lipid mixing/ Aggregation/ Cryo-transmission electron microscopy/ Transfection/ Cationic liposome

WATANABE, H. (1992). SUPERHOMAI. JPN PESTIC INF; 0 10-11.
Chem Codes: Chemical of Concern: DZ Rejection Code: NO TOX DATA.

BIOSIS COPYRIGHT: BIOL ABS. RRM RICE CORN COTTON WHEAT THIOPHANATE METHYL THIRAM DIAZINON FOOD CROP PRODUCTION DISINFECTANT FUNGICIDE INSECTICIDE ENVIRONMENTAL PROTECTION ECONOMICS Biochemistry/ Disinfectants/ Disinfection/ Sterilization/ Cereals/ Plants/Growth & Development/ Soil/ Plants/Growth & Development/ Soil/ Textiles/ Plant Diseases/ Preventive Medicine/ Herbicides/ Pest Control/ Pesticides/ Arachnida/ Entomology/Economics/ Insecticides/ Pest Control/ Pesticides/ Grasses/ Plants

Watanabe, H. and Grismer, M. E. (2001). Diazinon transport through inter-row vegetative filter strips: micro-ecosystem modeling. Journal of Hydrology 247: 183-199.
Chem Codes: Chemical of Concern: DZ Rejection Code: FATE.

The efficacy of inter-row vegetative filter strips (VFS) for controlling runoff of the commonly used organo-phosphate insecticide (diazinon) from dormant-sprayed orchards was investigated through development of physical (micro-ecosystem) models. The micro-ecosystem consisted of a pesticide sprayer, rainfall simulator and orchard floor model with and without VFS. Diazinon was sprayed at a rate of 2.8 kg/ha, 24 h prior to rainfall simulation. Rainfall, at an intensity of 50 mm/h and 44% of the natural rainfall energy, was simulated for 60 min. Experiments were conducted for 0, 50 and 100% VFS soil coverage. Diazinon concentrations in runoff, interflow and baseflow, and also in soil and vegetative samples were measured in order to quantify transport/adsorption processes.Total diazinon losses as a fraction of applied pesticide mass from the orchard floor following rainfall-runoff simulation were 8.6, 5.8 and 2.3%, respectively, for the 0, 50 and 100% VFS cover treatments. Diazinon runoff concentrations decreased with time during the rainfall simulation, but at a slower rate in the VFS treatments as compared to the bare soil treatment apparently due to washoff from the sod leaves. The principle mechanism of diazinon runoff control in VFS was diversion of runoff, the primary pesticide carrier, into interflow through the rootzone and mainly vertical infiltration (baseflow) such that the diazinon was trapped on the VFS surface and in its rootzone. In fact, 37 and 88% of the applied diazinon remained as residue in the VFS vegetative matter and rootzone for the 50 and 100% VFS treatments, respectively, following rainfall simulation. Results from the micro-ecosystem suggest that inter-row VFS should be effective in reducing diazinon runoff from dormant-sprayed orchards. These results are used to calibrate a field-applicable numerical model for development of pesticide runoff control strategies, or best management practices (BMP's). Vegetative filter strips/ Pesticides/ Runoff/ Orchards/ Water quality

Watanabe, Hirozumi and Grismer, Mark E. (2003). Numerical modeling of diazinon transport through inter-row vegetative filter strips. Journal of Environmental Management 69: 157-168.
Chem Codes: Chemical of Concern: DZ Rejection Code: FATE.

A numerical simulation model of pesticide runoff through vegetative filer strips (PRVFS) was developed as a tool for investigating the effects of pesticide transport mechanisms on VFS design in dormant-sprayed orchard. The PRVFS model was developed applying existing theories such as kinematic wave theory and mixing zone theory for pesticide transport in the bare soil area. For VFS area, the model performs flow routing by simple mass accounting in sequential segments and the pesticide mass balance by considering pesticide washoff and adsorption processes on the leaf, vegetative litter, root zone and soil. Model sensitivity analysis indicated that pesticide transfer from surface soil to overland flow and pesticide washoff from the VFS were important mechanisms affecting diazinon transport. The VFS cover ratio and rainfall intensity can be important design parameters for controlling diazinon runoff using inter-row VFS in orchard. The PRVFS model was validated using micro-ecosystem simulation of diazinon transport for 0, 50 and 100% VFS cover conditions. The PRVFS model is shown to be a beneficial tool for evaluating and analyzing possible best management practices for controlling offsite runoff of dormant-sprayed diazinon in orchards during the rainy season. Vegetative filter strips/ Modeling/ Pesticides/ Runoff/ Orchards/ Diazinon

WATANABE, T. (1998). DETERMINATION OF THE CONCENTRATION OF PESTICIDES IN ATMOSPHERE AT HIGH ALTITUDES AFTER AERIAL APPLICATION. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY; 60 669-676.
Chem Codes: Chemical of Concern: DZ Rejection Code: SURVEY.

BIOSIS COPYRIGHT: BIOL ABS. RRM RESEARCH ARTICLE HIGH ALTITUDES PESTICIDES DDT PESTICIDE AERIAL PESTICIDE APPLICATION POLLUTION ATMOSPHERIC CONCENTRATIONS Climate/ Ecology/ Meteorological Factors/ Biochemistry/ Air Pollution/ Soil Pollutants/ Water Pollution/ Herbicides/ Pest Control/ Pesticides

WATSON JE (1996). PESTICIDES AS A SOURCE OF POLLUTION. PEPPER, I. L., C. P. GERBA AND M. L. BRUSSEAU (ED.). POLLUTION SCIENCE. XXIV+397P. ACADEMIC PRESS, INC.: SAN DIEGO, CALIFORNIA, USA; LONDON, ENGLAND, UK. ISBN 0-12-550660-0.; 0 (0). 1996. 253-266.
Chem Codes: Chemical of Concern: DZ Rejection Code: FATE.

BIOSIS COPYRIGHT: BIOL ABS. RRM BOOK CHAPTER POLLUTION PESTICIDES POLLUTANT INSECTICIDE RODENTICIDE HERBICIDE PLANT GROWTH REGULATOR FUNGICIDE DISINFECTANT Biochemistry/ Air Pollution/ Soil Pollutants/ Water Pollution/ Herbicides/ Pest Control/ Pesticides

Watterson, Andrew E. (1999). Regulating pesticides in the UK: a case study of risk management problems relating to the organophosphate diazinon. Toxicology Letters 107: 241-248.
Chem Codes: Chemical of Concern: DZ Rejection Code: NO TOX DATA.

Objectives: (1) To assess aspects of occupational and related environmental health risk assessment and risk management decisions of UK regulatory bodies on diazinon used in sheep dip; and (2) to benchmark those decisions against ‘the public health precautionary approach’. Methods: Analysis of diazinon health and safety data available within Government Departments, industry and from users in animal husbandry practice. Results: (1) Data on diazinon produced by the manufacturing companies for the UK pesticide regulatory agencies are not fully transparent; (2) UK regulatory health and safety processes assume accuracy of manufacturer’s data and information provided on personal protective equipment (PPE) and application effectiveness; (3) data available reveal gaps and problems with diazinon toxicity, PPE and application methods; and (4) little published evidence shows that industry followed up the health of dippers after product registration or that government departments adopted a public health approach to regulation. Conclusions: Diazinon sheep dip illustrates the need for the application of a rigorous precautionary principle in both initial registration and later monitoring of chemicals. Organophosphates/ Diazinon/ Risk Management

Wauchope, R. D. (1978). The Pesticide Content of Surface Water Draining from Agricultural Fields - A Review. J.Environ.Qual. 7: 459-472.
Chem Codes: EcoReference No.: 83831
Chemical of Concern: DBN,DMB,ASAC,ACR,ATZ,DZ,AND,AMTL,CBL,CBF,CZE,24DXY,DDT,DLD,DU,ES,EN,FMU,FNF,HPT,LNR,MXC,PRN,MBZ,MLT,MSMA,PAQT,PRT,PCL,PMT,PCH,PPZ,SZ,TXP,TFN Rejection Code: NO SPECIES/REVIEW.

Wegner, S. J. and Campbell, L. J. (1991). Radionuclides, chemical constituents, and organic compounds in water from designated wells and springs from the southern boundary of the Idaho National Engineering Laboratory to the Hagerman area, Idaho, 1989.

Chem Codes: Chemical of Concern: DZ Rejection Code: SURVEY.

Descriptors: Pollution surveys

Descriptors: Water springs
Descriptors: Groundwater pollution
Descriptors: Water quality
Descriptors: Pollution monitoring
Descriptors: Radioactive contamination
Descriptors: Organic compounds
Descriptors: DDT
Descriptors: USA, Idaho, Snake R.
Abstract: The US Geological Survey and the Idaho Department of Water Resources, in response to a request from the US Department of Energy, have completed the initial phase of a long-term project to monitor the quality of water in the Snake River Plain aquifer from the southern boundary of the Idaho National Engineering Laboratory to the Hagerman area, Idaho. Fifty-five water samples were collected and analyzed for manmade pollutants and naturally occurring contaminants. The samples were collected from 26 irrigation wells, 13 domestic wells, 5 springs, 4 stock wells, 3 dairy wells, 2 observation wells, 1 commercial well, and 1 publicsupply well. Six quality assurance samples also were collected and analyzed. All water samples were analyzed for selected radionuclides, chemical constituents, and organic compounds. The maximum contaminant level established by the US Environmental Protection Agency for gross alpha-particle radioactivity was exceeded in one samples; the maximum contaminant level for mercury also was exceeded in one sample. Both sampling locations in which gross-alpha radioactivity and mercury concentrations were less than maximum contaminant levels. Concentrations of diazinon and malathion exceeded the reporting level in two water samples. One water sample and its quality assurance replicate contained reportable concentrations of DDT. Contract AC07-76ID01570 Sponsored by Department of Energy, Washington, DC (DBO).