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This section presents a brier 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 1 t, 1993 by Mr Kyle Christie These practices are included for Arco sites for which Groundwater Technology penorms 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 e 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 monitonng wells for the first event only C) Be consistent with the type of equipment used during the purging of groundwater monrtonng wells For example, if 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 sample collection i