Laserfiche WebLink
imapacted vadose zone hydrocarbons Measurable vacuum influence was <br /> identified up to 45-feet from the extraction well <br /> 6 . 0 INTERIM REMEDIATION SYSTEM <br /> ' In order torovide a total cleanup of the <br /> P p hydrocarbon plume at the site, <br /> several different remediation strategies will be required Affected areas <br /> ' requiring remediation, as we know of them at this time, include (1) the <br /> source area in both groundwater and the vadose zone adjacent to the <br /> USTs and dispensers on--site, (2) the groundwater currently leaving the <br /> property to the north, and (3) the groundwater that has already left the <br /> site and is affecting off-site wells <br /> As an interim measure, ASE proposes a series ofroundwater extraction <br /> xtraction <br /> wells along the downgradient edge of the subject site to capture <br /> contaminated groundwater prior to its movement off-site The following <br /> section describes ASE's proposed interim remediation system A more <br />' permanent remediation system(s) which will address remediation in both <br /> groundwater and the vadose zone in the source area on-site, and the <br /> remediation of groundwater which has already Ieft the site, will be <br /> discussed in a corrective action plan which will be completed in the very <br /> near future <br /> 6- 1 Groundw le Extrnytion System Components <br /> The interim remediation system will use the technology commonly <br />' referred to as "pump and treat" to create a depression of the water table <br /> in the area north of the USTs and dispensers which will, in effect, disallow <br /> further migration of the plume off-site The captured groundwater will <br /> then be treated with liquid-phase activated carbon prior to discharge to <br /> the local sanitary sewer The system has been designed to operate <br />' automatically on a constant basis, 24-hours per day, 7-days per week <br /> The basic components of the system are depicted on Figure 5, and are as <br /> follows <br />' 61 1 Groundwater Extraction Wells <br /> Groundwater will be extracted from (5) 2-inch diameter extraction wells <br /> spaced between 25-feet and 30-feet from each other Three of the <br /> extraction points currently exist at the site (piezometers P-2, P-3 and P-5) <br /> Two additional extraction wells are scheduled for installation the week of <br /> September 11, 2000 <br /> Frank's One Stop Interim Remediation System Workplan — September 2000 <br /> -14- <br />