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........... <br /> EMEM.- <br /> ........... <br /> P R 0 C E D U 11 E S <br /> MaLhodologiale and Conventions <br /> GENML PRACTICES WITHIN A MULTIPLE AGENCY JUERARCHY <br /> U.S. Environmonta! Protection Agency standards merve as the roundralon tar <br /> all field sampling operations performed by our firm. The EPA SW 846 In thn <br /> primary Publication from which pr"odures are derived, though there arc <br /> additional EPA sourcea such us training films and verbal communications. <br /> Sampling related to underground storage Links and tank related threats to <br /> groundwater are governed by the California Water Resources Control Board and <br /> their Regional Voter Quality, Control Boards. While some aspects of field <br /> and taboratory work may be delegated to the California Deptirtment of Health <br /> Services, the CWRCB and the nine national Water Quality Control Boards <br /> ratablirh the general and specific criteria for sampling performed in <br /> connection with unearground storage tanks. This is done through the <br /> publication of guidance, documents, the issuance of mamorands and verbal <br /> announcomentit. <br /> Other agencies, such as Air Pollution Control Districts, may require <br /> additional samples, but the-,e tire usu3lly in l!d(fillo Lrb samples required by <br /> tho RWQCH. Local implementing agency ILIA) inspectors are frequently present <br /> during the tank removal phase of t% project and efthar direct or request that <br /> manplas be taken a-cccrding to RWQCB upecifications. Additional samples may, <br /> and frequently are. takon at the request of the LIA Insp4ctor. <br /> Based on field conditions directly observable by the LIA inspector, our <br /> field Wronne) may be asked to collect samples that are tailored to the <br /> specific situation and which the inspector judges will provide substantial <br /> information about the site. Quite often Mine directforz or suggestions <br /> coincide with the sampling areas established by the RWQCB as the proper <br /> collection points for samples which will be used am t1he Priwt.ry Crittria for <br /> a Regulatory Agency Determination on whether additional exploration or <br /> remedlation will be required at a particular site. Similarly, there are <br /> instances when the LIA Inspector's Judgements do not coincide with Board <br /> specifications. <br /> Two common examples of this are as follows: <br /> 1. A Imel Implementing agency inapector tiotes that soil dug up from the <br /> correct RWQCD interface sampling point Is rel3tively clean, but observes that <br /> -there-is-quite-ob-AousIX-contamina ted-backlill underlying-the center of-the <br /> tank. Tha Inspector directs that the contaminated backfill should be taker. <br /> Instead of the clean Interface soil so as to provide information abcnit the <br /> worst c*se" conditions within the tank pit. <br /> 2. The soil at the specified interface onmpling depth is found to be slightli <br /> contaminated, but much lost to than tho soil only a, few inchca above, Noting <br /> sampling Report 88055-C-2 CHEVRON 1918 <br /> page 7 <br />