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® 4.0 ANALYTICAL PROCEDURES <br />4.1 Laboratory Methods <br />4.1.1 EPA Methods <br />Whenever available and applicableEPA-approved methods for sample <br />preparation and analysis will be used. When several EPA methods are <br />available for the same analysis, the choice will be based on the accuracy <br />and reliability of the method. Preference will be given to instrumental <br />methods whenever possible. Other methods acceptable to the EPA are found <br />in Standard Methods (reference) and ASTM Methods (reference), NIOSH and <br />California State Air Board Resources. Should modification of any method be <br />necessary, changes are fully documented and appropriate quality assurance <br />testing performed to assure the method meets laboratory reliability stan- <br />dards. <br />4.1.2 Environmental Designed Lab E( DL) Met® <br />4.1.2.1 Method Generation <br />Some analysis are so unique to laboratory requirements that <br />Project Plan <br />Revision 6 <br />1/8/1988 <br />Page 5 of 37 <br />(see Appendix 1) effectively validates all analytical <br />results. Samples <br />must be <br />in constant custody by fulfilling one of the following conditions: <br />i) <br />be in one's physical possession or view <br />' <br />ii) <br />not tampered with <br />iii) <br />be retained in restricted and secured area <br />iv) <br />be in a secured, sealed container. <br />The standard operation procedure describes in detail the chain -of - <br />custody <br />documentation and sampling guidelines. <br />® 4.0 ANALYTICAL PROCEDURES <br />4.1 Laboratory Methods <br />4.1.1 EPA Methods <br />Whenever available and applicableEPA-approved methods for sample <br />preparation and analysis will be used. When several EPA methods are <br />available for the same analysis, the choice will be based on the accuracy <br />and reliability of the method. Preference will be given to instrumental <br />methods whenever possible. Other methods acceptable to the EPA are found <br />in Standard Methods (reference) and ASTM Methods (reference), NIOSH and <br />California State Air Board Resources. Should modification of any method be <br />necessary, changes are fully documented and appropriate quality assurance <br />testing performed to assure the method meets laboratory reliability stan- <br />dards. <br />4.1.2 Environmental Designed Lab E( DL) Met® <br />4.1.2.1 Method Generation <br />Some analysis are so unique to laboratory requirements that <br />