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15 June 1999 <br /> A - <br /> GE NC Project Na 98-0450 <br /> tPage 19 of 27 <br /> Detailed procedures and results of the remediation were included in a Closure Summary Report <br /> dated 05 May 1997 for the Former Art and Artists located at 204 East Lodi Avenue in Lodi, <br /> Califonua Increased concentrations of organic vapor were observed at surrounding monitoring wells <br /> ' and extraction wells Only slight ground water mounding was observed during the remediation, <br /> which is typical of combined soil vapor extraction and air-sparging Due to the close proximity of <br /> the remediation site to the subject site and similar lithology, it is assumed that the two sites would <br /> yield similar"sparging" conditions <br /> 515 Duration <br /> Air sparging in highly permeable aquifers generally results in rapid reduction of volatile hydrocarbon <br /> ' concentrations in the saturated zone Remediation times are generally comparable with soil vapor <br /> extraction times Typically, a remediation period of 12 to 18 months is required for gasoline-range <br /> hydrocarbons <br /> 5 1 b Estimated Cast <br /> Prior to installation of an air sparge/SVE system, a pilot test would need to be conducted to assess <br /> ' the effectiveness of the alternative The cost to install an air sparge/SVE pilot system and conduct <br /> a pilot test is estimated to range from $10,000 to $20,000 The costs for installation, operation and <br /> general maintenance of air sparge/SVE systems varies, depending upon the particular system utilized <br /> ' for destruction of the extracted hydrocarbon vapors(thermal destruction,carbon adsorption,etc )and <br /> the established cleanup goals The cost to install an air sparge/SVE array and system ranges from <br /> $20,000 to $40,000 Sparging equipment maintenance and monitoring would range from $5,000 to <br /> 1 $10,000 annually The cost to operate, monitor and sample an air sparge/SVE system could vary <br /> from $15,000 to $45,000 annually The total cost of in-situ air sparging/SVE for a treatment period <br /> of 24 months could range from $40,000 to 95,000 <br /> 1 <br /> ' 5 2 GROUND WATER EXTRACTION <br /> Ground water extraction can be used to contain or remove a contaminated plume of ground water, <br /> to alter direction of ground water movement, or to adjust groundwaterlevels <br />' S 2 1 Principles <br /> There are several different methods for treatment of extracted ground water, which are collectively <br /> Advanced CcoEmtronmcntal,Inc <br />