WORK PLANS - Laserfiche WebLink

Home Browse Search

v5 TCeaTeK October 18, 1991 JUN a 61992 Mr. Pete (dambernco kNJI.bNMENW1HFPllH Vintage Car Wash. Inc. FERMI n Bad Avenue, Suite D-2 Modesto, CA Issue Dear Mr. Oiambmm: Per our previous discussion regarding tire terminology provided within our July 11 , 1991 report etailing the results from the confirmation soil sampling off on at Ilia Vintage Car Wash Inc. site located at the Intersection at Minor Avenue and American Street In cowntmvn Stockton, the following explanatiWdOinition Is provided. The term weathered' in reference to gasoline In the emlronment is a generically regular! term which Is synonymous with the terms 'aged' or 'old-. All three terms are adjectives which refer to the Impact of environmental conditions upon a particular compound Hawley'a condensed Chemical Dictionary, Eleventh Edition, refers to aging or weathering as 'gradual deterioration of a managed due to long exposure to the environment'. Many well documented environmental Instant come Into consideration in the weathering or aging process for gasoline. These faclors consist of, but are not limited to 1) blological degradation, 2) vapor di fuskin and 3) leaching/flushing. These factors tend to remove the components team the environment In a very spatia lic bushier. Biological degradation will occur as naturally ncs urring bacteria seek out carben sources for nutrients. For microorganisms to grow, they must draw from the emlronment all the substances (nutrients) they require for the generation of energy and the synthesis of their cell matemis. Although they have the same basic nutritional requirements as higher life forms, they diller in the way they lake up these nutrients. In Inds respect, bacteria and fungi are termed osmolorphs because they obtain their nutrients as s dullons that pass through the cell membrane Osmohophic mkroorgandams are unable to transport large molecules (such as long chain hydrocarbons) Though their membranes and must, therefore, digest them outside the call. Large molecules are broken down Into simpler ones by Bxmenzyme that are secreted from the cell to the external environment. These small breakdown products are Than transported In Ilia call had, once Inside, are chemically modified to meet the specific malignant needs of the cell. In order to movies, mlcroagessms, like humans, produce a variety of enzymes to sustain protein synthesis, DNA synthesis and other functions necessary to maintain viability. Such enzymes, which re generated on a continuous basis, are termed 'constitutive'. Enzymes that are synthesized In response to a stimulus or need, such as that represented by the presence of pollutant chemicals, are called Inducible enzymes'. Especially within a recently contaminated matrix, organisms which re generically able to synthesize the required Inducible enzymes for corlaminam degradation will require time to do W. f-nviyOtllnPHlhl Sell AIIhSifllary Of OxyChan