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s Horizon Environmental, inc FIELD METHODS AND PROCEDURES The following section describes field procedures utilized by Horizon Environmental Inc (Horizon) personnel in performance of the tasks involved with this project 10 HEALTH AND SAFETY PLAN Field work performed by Horizon and 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 descnbes 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 EVALUATION Each monitoring well is opened and allowed to equilibrate to atmospheric pressure prior to measuring depth to groundwater Depth to groundwater will be measured to the nearest 0 01 foot using an electronic hand held water level indicator Depth to groundwater will be measured from the surveyed point on the top of the well casing The tip of the probe will be examined to evaluate whether a product sheen is present 3 0 MONITORING WELL PURGING AND SAMPLING Prior to purging, a clean transparent bailer is lowered into the well and a sample of the groundwater is brought to the surface and inspected for the presence or evidence of product on the top of the groundwater Groundwater sampling events conducted after the initial well development and sampling event are preceded by purging three to four well volumes utilizing hand bailing or an electrical purge pump Purge water will be monitored for the parameters temperature, pH, and conductivity until stabilized Wells will recharge to 80% before sampling If wells dewater they will be allowed to recharge for a minimum of one to two hours prior to sampling After the water levels within the wells stabilize, a sample will be collected with a dedicated, clean, disposable plastic bailer Samples will be contained in air-tight vials and then packed on ice and sent to the laboratory for analysis Groundwater samples will be transported to the laboratory and analyzed within the EPA-specified holding time for requested analysis Each sample container submitted for analysis will have a label affixed to identify the job number, sample date, time of sample collection, and a sample number unique to that sample Samples will be analyzed by a California-certified laboratory A chain-of-custody form will be used to record possession of the sample from time of collection to its arrival at the laboratory When the samples will be 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 will verify sample integrity and confirm that it was collected in the Proper container, preserved correctly, and that there is an adequate volume for analysis Report No 494gmr95 q4 Job No 1494 31 HORIZON ENVIRONMENTAL INC