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OVERVIEW This section presents a brief summary of practices requested by Arco Products Company that are not normally Included in the Groundwater Technology Inc Standard Operating procedures referenced above The practices were compiled from the Request for Bid for Groundwater Sampling at ARCO Retail Facilities in Northern California letter dated November 11, 1993, by Mr Kyle Christie These practices are included for Arco sites for which Groundwater Technology performs the monitoring and sampling activities a) Use only Arco Products Chain-of-Custody Forms For groundwater sample identification the depth the sample was collected is placed next to the well identification (i a MW10-5, means the sample for monitoring well MW-10 was collected at 5 feet below grade) The laboratory will be notified in advance of the arrival of groundwater samples b) Measure depth to bottom of the monitoring wells for the first event only C) Be consistent with the type of equipment used during the purging of groundwater monitoring wells. For example, d a monitoring well is consistently hand bailed during purging do not switch to pumping to purge the well d) Use four 4-foot orange cones when accessing monitoring wells in driveways or parking lots. e) Feld_personnel_must have station manager=approval=before disposing of-trash-generated during field activities In on-site containers f) Fill out field reports, groundwater sample field data sheets, and summary of groundwater -- monitoring sheet (to be-stamped by a California registered geologist or engineer) for each site for documentation of field activities Copies of these forms are included with this attachment for reference. g) Maintain well identification symbols and dear well boxes of debris as necessary. h) Purge three (3) well volumes of groundwater from the monitoring wells prior to groundwater sampte collection �J