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SAN JOAQUIN DELTA COLLEGE
<br /> Samples for organic analysis were sealed after exposure,refrigerated,then were sent by express mail to Gulf Coast Analytical
<br /> Labs, Inc, Baton Rouge, LA for analysis (Attachment I Section) Gulf Coast Analytical is AIHA approved for this type of
<br /> analysis Sample collection and analysis was in accordance with the NIOSH Manual of Analytical Methods, third edition,
<br /> 1984,with 1987 updates as applicable The Attachment Il Section lists the sampling conditions, times, and materials See
<br /> Diagram section for location of sampling
<br /> Water samples were collected for TPH and BTEX and were delivered to FGL Environmental for analysis Results for the
<br /> water analysis were sent directly to Stacy Pinola All information related to the water sampling is included in the Attachment
<br /> U1 Section
<br /> Determination of maximum permissible concentration values, will now be discussed When two or more hazardous
<br /> substances,which act upon the same organ system, are present,their combined effect should be given primary consideration,
<br /> rather than that of their individual effects In the absence of contrary information,the effects of the different hazards should
<br /> be considered as additive If the sum of the fractions(C I/T 1 +C2M+ +Cn/Tn)exceeds unity,then the threshold limit of
<br /> the mixture should be considered as being exceeded Cn indicates the observed atmospheric concentration, and Tri the
<br /> corresponding threshold limit
<br /> When a given operation characteristically emits a number of potentially harmful vapors, it is only feasible to attempt to
<br /> evaluate the hazards by measurement of a single substance In such a case,the threshold limit used for this substance should
<br /> be reduced by a suitable factor, the magnitude of which depends on the number, toxicity and relative quantity of the other
<br /> contaminants ordinarily present
<br /> Additional information
<br /> I would like to offer the following additional information as related to the materials sampled in order to provide an
<br /> understanding of chemical exposure and dilution ventilation
<br /> Hydrocarbons - Total hydrocarbons as associated with indoor air quality are typically referred to as volatile organic
<br /> compounds(VOC's) They belong to a relatively large group of organic compounds that contaminate both indoor and outdoor
<br /> air quality VOC sources may include construction materials such as adhesives, paints, primers and solvents, or consumer
<br /> products such as glues,paints,pruners,cleaning solvents and cosmetics
<br /> Gasolme-A clear, aromatic, volatile liquid A mixture of aliphatic hydrocarbons, branched chain paraffins, cycloparaffins
<br /> and aromatics with a flash point of-45°F Symptoms of exposure include conjunctivitis,irritation of nose and throat,defattmg
<br /> dermatitis,headache, dizziness, drowsiness, confusion, cough, dyspnea (difficult breathing), bronchitis, pneumonia, nausea,
<br /> vomitmg, nervousness and irritability, blurred vision, ataxia, coma and convulsion The vapors are considered to be
<br /> moderately poisonous It acts as a simple asphyxiant It is a common air contaminant
<br /> Eye irritation and irritation of the upper respiratory tract are the most common symptoms associated with acute exposure to
<br /> VOC's
<br /> Permissible Exposure Limit - (PEL) - The limit established by the Occupational Safety And Health Administration
<br /> (OSHA) This may be expressed as a time-weighted average(TWA) limit or as a ceiling limit that legally must never
<br /> be exceeded instantaneously even if the TWA exposure limit is not violated OSHA PELs have the force of law Note
<br /> that ACGIH TLVs and NIOSH RELs are recommended exposure limits that may or may not be enacted into law by
<br /> OSHA
<br /> Threshold Limit Value - Time Weighted Average (TLV-TWA) - The time weighted average concentration for a normal
<br /> 8-hour workday and a 40-hour work week,to which nearly all workers may be repeatedly exposed, day after day, without
<br /> adverse effect See Table III
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