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Limited Groundwater Investigation 6 <br /> APCL conducted the filtration and preservation of groundwater samples for dissolved metals. EPA <br /> Test Method 7199 requires the filtration of the sample through a 0.45-micron filter before analysis. <br /> As such, all Cr VI groundwater results are in the dissolved phase. In addition to the analyses <br /> requested,groundwater samples were also analyzed for dissolved Cr VI using EPA Test Method <br /> 7196 to serve as backup documentation pending APCL's final ELAP approval for EPA Test <br /> Method 7199, and as a comparison to the Test Method 7199 results. <br /> Because Cr VI has a 24-hour laboratory holding time, samples were collected in a manner to meet <br /> overnight shipment to the laboratory within holding times.A summary of the analytical results for <br /> the groundwater samples is provided in Table 1.Laboratory reports and chain of custody forms for <br /> these samples are included in Appendix C. <br /> 3.3 Field Quality Assurance/Quality Control (QA/QC) Samples <br /> During the groundwater sampling activities, two field duplicate groundwater samples were taken, <br /> one duplicate sample at the Lathrop facility (LP-G6-Water) and one duplicate sample at the French <br /> Camp facility (FC-G6-Water). Equipment blank samples were collected from the EC-5 soil sample <br /> barrel, the soil sample liner, and the EC-2 groundwater sample rod each sampling day. A total of six <br /> equipment blank samples were collected between May 7 and 8, 2001, three equipment blank samples <br /> (EQB-050701-1 through EQB-050701-3) were collected at the Lathrop facility, and three similar <br /> equipment blank samples (EQB-050801-4 through EQB-050801-6) were collected at the French <br /> Camp facility. <br /> 3.4 Sample Transport and Handling <br /> Groundwater samples were prepared for shipment to APCL. Samples were transferred directly to <br /> laboratory provided sample bottles as described in Section 3.2. The sample bottles were then placed <br /> in a sealable plastic bag, and placed on ice in a cooler pending transportation to the laboratory. <br /> Groundwater samples were assigned a unique identifier that was recorded in the field documentation <br /> and permanently attached to the sample container with both a marker and a gummed label. Samples <br /> were packed in a sturdy shipping container (an ice chest). A chain of custody form, completed in the <br /> field and providing a record of the samples offered for shipment, accompanied each ice chest. <br /> Transfer of samples from the facilities to laboratory followed chain of custody procedures and was <br /> shipped to APCL by overnight services. The chain of custody form was signed by the sampler and <br /> sealed inside the cooler in a waterproof bag. Documentation of the carrier was maintained. The <br /> original chain of custody form accompanied sample shipments. <br /> P:\wp\jobs\20587\LP—FCGA'.doc—DCN 102300 June 2001 <br />