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FIELD METHODS AND PROCEDURES The following section describes field procedures that are to be used by Delta personnel in the performance of the tasks involved with this project 10 HEALTH AND SAFETY PLAN Fieldwork performed by Delta and Delta's subcontractors at the site will be conducted according to guidelines established in a Site Health and Safety Plan (SHSP) The SHSP is a document that describes the hazards that may be encountered in the field and specifies protective equipment, work procedures and emergency information A copy of the SHSP will be at the site and available for reference by appropriate parties during work at the site 2 0 GROUNDWATER DEPTH ASSESSMENT A water/product interface probe is used to assess the liquid-phase hydrocarbons (LPH) thickness, if present, and a water level indicator is used to measure the groundwater depth in monitoring wells that do not contain LPH Depth to groundwater or LPH is measured from a datum point at the top of each monitoring well casing The datum point is typically a notch cut in the north side of the casing edge If a water level indicator is used, the tip is subjectively analyzed for LPH sheen 3 0 SUBJECTIVE ANALYSIS OF GROUNDWATER Prior to purging, a water sample is collected from the monitoring well for subjective assessment The sample is retrieved by gently lowering a clean, disposable bailer to approximately one-half the bailer length past the air/liquid interface The bailer is then retrieved and the sample contained within the bailer is examined for floating LPH and the appearance of an LPH sheen 4 0 MONITORING WELL SAMPLING .Monitoring wells are purged using a pump or bailer until pH, temperature and conductivity of the purge water has stabilized and a minimum of three well volumes of water has been removed hhe purge water is placed to 55-gallon drums and temporarily stored on site pending evaluation of disposal options If three well volumes cannot be removed in one-half an hour's time, the well is allowed to recharge to 80 percent of original level After recharging, a groundwater sample is then removed from each of the wells using a pump or disposable bailer The water sample is collected, labeled and handled according to the Quality Assurance Plan Water generated during the monitoring event is disposed of according to the accepted regulatory method pertaining to the site 5 0 QUALITY ASSURANCE PLAN This section describes the field and analytical procedures to be followed by Delta throughout the investigation 5.1 General Sample Collection and Handling Procedures Proper collection and handling are essential to ensure the quality of a sample Each sample will be collected in the appropriate container, preserved correctly for the intended analysis and stored, prior to analysis, for no longer than the maximum allowable holding time Details on the procedures for collection and handling of soil samples from this project can be found in previous sections 5.2 Sample Identification and Chain-of-Custodiv Procedures Sample identification and chain-of-custody procedures ensure sample integrity and document sample possession from the time of collection to its ultimate disposal Each sample container submitted for analysis will have a label affixed to identify the job number, sampler, date and time of sample collection and a sample number unique to that sample During soil sampling, this information, in addition to a description of the sample, field measurements made, sampling methodology, names of on-site personnel and any other pertinent field observations will be recorded on the borehole log or in the field records w lrpms callworkmglproject 6ks1100966 stockton 2537 waterloo roadl8wml4 q 051rpm3 0966 gwm 4th q05 doc