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Mr. Hal Miller M JUS � � <br /> June 8, 1989 1989 <br /> Page 5 <br /> In late February 1988 a groundwater mound was produced at the s <br /> eastern edge of the site due to a leaking water pipe at the back <br /> of the Arcade building (See Attached Figure 2) . Attempts to have <br /> the owner fix the leak were not successful. <br /> Throughout 1988 water levels continued to drop and subsequently <br /> the pumping rates decreased from Pw-1 and RW-1. By December <br /> 1988, RW-1 was being pumped at 1-to-2 gpm and PW-1 was being <br /> pumped at an average of .125 to .25 gpm. Soil vent extraction <br /> system operations continued successfully through 1988. <br /> Results of continued monitoring well sampling showed dissolved <br /> hydrocarbons confined on site with the only measurable <br /> concentrations detected in MW-1 and FW-3 (See Attached Table 'l) . <br /> ti. Domestic well sampling results showed the same pattern as in <br /> 1987, with sporadic unconfirmed occurrences of detectable <br /> dissolved hydrocarbons (See Attached Table 2) . <br /> 1989 <br /> To date in 1989, GTI has continued to conduct pumping from PW-1 <br /> and RW-1 at allowable pumping rates. Soil vent system operations <br /> have also continued. Monitoring and domestic well samplin .- have <br /> continued on a regular schedule. In March 1989, GTI submitted a <br /> work plan for further site assessment activities. Additional <br /> plans were made to increase flow rates through the shallow vent <br /> points and to expand the soil-vent system to allow deeper <br /> influence and provide more aggressive soil remediation. in <br /> April, vacuum tests were conducted on existing and future soil- <br /> vent extraction wells. The feasibility of using a Catalytic <br /> ScavengerTM Incineration System for vapor treatment was re- <br /> confirmed. Also in April, the leaking water pipe causing <br /> mounding of the water 'table was repaired. <br /> GRUL'Np11:;TER <br /> TEcuNmu,lc),.Isc. <br /> .. a <br />