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Appendix A March 20, 1995 ' Page 2 ' Monitorine Well Develo ment Purging and Sampling ' After well construction was completed, the water level in each well was measured with an electronic well sounder and the wells were checked for free product using a clear disposable polyethylene bailer The wells were subsequently developed using a vented surge block Approximately three well volumes of water were then removed by using a submersible pump ' until temperature, pH and conductivity readings stabilized and/or the water cleared of sediment After a minimum of 24 hours from the time of development, the water level in each well was measured, and the water checked for visual signs of free product using a clear disposable rpolyethylene bailer Approximately three to five additional well volumes of water were purged using a clean bailer until temperature, pH, and conductivity readings stabilized and/or the water cleared of sediment The water samples were then collected using new disposable polyethylene bailers Water from the bailers was decanted into appropriate sample containers provided by the laboratory The samples were immediately placed in an ice-chest with ice, along with a travel blank, and submitted under chain-of-custody to a California-certified laboratory for analysis of TPH using EPA method 8015 and BTEX using EPA method 602 Water sampling equipment was cleaned prior to development and purging of each well with a Isolution of Alconox detergent and water to minimize the potential for cross contamination All water removed during development and purging operations was stored in sealed, labeled 55- gallon drums Subsequent to installation and completion, well locations and elevations were surveyed by a California-licensed surveyor to aid in the determination of the hydraulic gradient and flow direction WALLACE KUHL Rayed p." Sr ASSOCIATES INC