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i analysis for no longer than the maximum allowable holding time Details on the procedures for collection and handling of samples used on this project can be found in this section and in the attached DQI tables Soil and Water Sample Labeling and Preservation Label information includes a unique sample identification number, lob identification number, date, and time After labeling, all soil and water samples are placed in a Ziploc® type bag and placed in an ice chest cooled to approximately 4°C Chemical preservation is controlled by the required analysis and is noted on the chain-of-custody form Trip blanks supplied by the laboratory accompany the groundwater sample containers and groundwater samples Upon recovery, the sample container is sealed to minimize the potential volatilization and cross- contamination prior to chemical analysis Soil sampling tubes are typically closed at each end with TeflonT"" sheeting and plastic caps The sample is then placed in a Ziploc® type bag and sealed The sample is labeled and refrigerated at approximately 4° Celsius for delivery, under strict chain-of- custody, to the analytical laboratory Chain of Custody The chain-of-custody form is used to record possession of the sample from the time of collection to its arrival at the laboratory When samples are shipped, the person in custody of them relinquishes the samples by signing the chain-of-custody form and noting the time The sample-control officer at the laboratory verifies sample integrity and conforms that the samples are collected in the proper containers, preserved correctly, and contain adequate volumes for analysis These conditions are noted on a Laboratory Sample Receipt Checklist (see attached) which will be included in the laboratory report If these conditions are met, each sample is assigned a unique log number for identification throughout analysis and reporting The log number is recorded on the chain-of-custody form and in the legally-required log book maintained by the laboratory The sample description, date received, client's name, and other relevant information is recorded Analytical Methods Soil and groundwater samples collected during exploratory sire investigation activities and development and sampling of monitoring wells, will be analyzed under a standard 10-day turnaround time Samples are analyzed using analytical methods outlined in EPA Manual SW 846 and approved by the California Regional Water Quality Control Board- Central Valley Region in the Leaking Underground Fuel Tanks (LUFT) manual and appendices Samples collected during the investigation of petroleum hydrocarbon impacted sites are typically analyzed for total petroleum hydrocarbons ([C2-C12 range] TPHG, BTEX, and oxygenates using EPA Method 82608 and total petroleum hydrocarbons ((Cla-C24])TPHd using EPA Method 8015 The attached DQI tables present the state-certified laboratory's calibration and quality assurance procedures for the above mentioned analytical methods Internal laboratory quality assurance checks will be the responsibility of the contract laboratories Data and reports submitted by field personnel and the contract laboratory will be reviewed and maintained in the project files Data Review and Verification