ARCHIVED REPORTS_WORK PLAN TO ESTABLISH BACKGROUND SOIL CONCENTRATIONS

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. GEE" GENESIS ENGINEERING&REDEVELOPMENT precision of the analysis of field duplicate samples. If the precision of field duplicates is high, it will be assumed that the samples collected were representative of the Site. If, however,the medium sampled is naturally heterogeneous,the precision of field duplicates may be poor, but the data may still be representative of the Site condition. When precision is poor, additional samples may need to be collected. 4.5 Comparability Comparability is a qualitative measure assessing the confidence with which data sets obtained for similar samples and sample conditions can be correlated. Comparability is determined by the adherence of different laboratories and different sampling teams to standard sampling protocols and analytical methods as well as by the use of traceable calibration standards and the same reporting units. Comparability can be determined by having the various laboratories participate in a performance evaluation program or through collection of split samples for testing by independent laboratories. 5.0 SAMPLING PROCEDURES The field activities to be conducted as a part of the investigation outlined in the Work Plan • include the collection and analysis of soil and groundwater samples; logging subsurface lithology; and sample location mapping. Field activities will be conducted in accordance with the SAP. Sample locations are identified in the Work Plan, and the sampling procedures and standard methods are described in the SAP. Sample handling(e.g., labeling,preservation, shipping, and chain-of-custody protocols) are also described in detail in the SAP. Evidence of chain-of-custody for samples that are not analyzed in the field will be traceable from the time the sample is collected until the filled sample bottles are in the possession of the analytical laboratory and the requested analyses have been performed. Field personnel will complete sample analysis request/chain-of-custody forms (in triplicate)and affix chain- of-custody seals to each sample shipment container if custody is relinquished to a third party shipping company(e.g., Federal Express, United Parcel Service). Field personnel will not leave samples unattended and will relinquish samples only to the analytical laboratory sample custodian or an authorized shipping agent. 6.0 ANALYTICAL AND QUALITY CONTROL PROCEDURES Collection of representative field samples requires adherence to established procedures. The following analytical and QC procedures will be followed to ensure quality data. • William DePaoli Property 5 of 21 Quality Assurance Project Plan February 2012