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,-)VERVlc'. This soctien oresents a brae€ summary or practices requested by r,rco Products Company that are not rormally included in the Grounawater Technology Inc Stanaara OQerating procedures referenced aoove T rye practices were comded from the Request for Bid for Groundwater Sampling at ARCO Retail Facilities in Northern California letter Gated November 11 1993 b� Mr Kyle Christie These practices are includeo for Arco sites for which Grounawater Technology performs the monitoring and sampling activities a} Use oniv Arco Products Chain or-Custodv Forms For groundwater sample identification the depth the sample was collected is piacea next to the well identification (i a MW10-5, means the :ample for monitoring well MW-10 was collected at 5 feet below grace) 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, 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) Field 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