ARCHIVED REPORTS XR0001725 - Laserfiche WebLink

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September 12, 1991 ARCO Station No 760, Lodi, California CONCLUSION Utilizing the vacuum and distance measurements obtained during the VET allows a flow rate and effective radius of influence to be estimated for the site The effective radius of influence is defined as the radial distance from a vapor extraction well within which vacuum levels indicate that subsurface flow is sufficient for remediation RESNA estimates that a wellhead vacuum of 30 inches of water at a flow rate of 50 cfm will result in an effective radius of influence of approximately 22 feet. Vapor extraction wells to be used for remediation at the site should be installed at distances no greater than 44 feet apart RESNA concludes that vapor extraction can be a practical and cost-effective method of soil remediation at this site The drilling and sampling of additional test borings in the former tank cavity and product line areas with subsequent chemical analysis of soil samples is required to further evaluate the volume of residual hydrocarbons beneath the site The estimate of the radius of influence will be further refined and remediation time frame will be estimated after the subsurface environmental investigation is performed REMEDIAL RECOMMENDATIONS . Based upon the results of laboratory analyses of six soil samples collected in July 1991, and ` previous investigative work,RESNA recommends that a vapor-extraction system be installed to remove residual gasoline hydrocarbons from the soil The proposed location of vapor- extraction wells and the estimated radius of influence are shown on the Proposed Remediation System, Plate 2. Upon approval of the appropriate documents required for public review by the San Joaquin County Environmental Health Department, we will install the vapor-extraction system to remove the gasoline hydrocarbons from the soil We intend to install a thermal or catalytic oxidizer to destroy the removed gasoline hydrocarbons 0912CCAR 38048-Q6 3