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J09/17/2003 09:39 209832:' WRIGHT ENVIRONME L PAGE 03 <br /> Ver Monitoring Probes <br /> Three vapor mcnitorin <br /> g probes will be installed at different depths to ytarget the <br /> 0 .siltrclay and sandy zones. The probes will ire:used`; collect vapor samples a id .: <br /> pressure/vacuum readings to'monitor the effect of SVE. .These probes may �e <br /> nested in a single borehole should space constraints pr'+ecfude installation at different <br /> radial distances from the extraction Wells; <br /> R-1, 1-inch diameter, PVC Schede `i l <br /> Schedule 84, 0.020 f+slot sizei screened — 15-20 feet- <br /> P-2,P-2, 1-inch diameter, PVC Scftedule 80 0.020: <br /> slot size,, screened —25-30 feet. � <br /> P-3, 1-inch.diameter, PVC Sct eduia 80., 0.d2o Isot Size,%scr'eened --30-35 feet. <br /> Probe P-2 is to be installed within the <br /> feet are anticipated "tighter" silt/clay strata, so the depths of 25-<x0 <br /> given current review of the available geologic cross,sections., f <br /> The well depths will be adjusted _to the strata contacts observed in the field o <br /> position the wells and probes. ;` - <br /> SVE Test Desai tion i. <br /> :4 The equipment arrangement.'is shown schematicaiiyl: on figure 3 -- SVE Teat <br /> Schematic. We anticipate the following equipment will:j be utilized. A 3-harsepowf r <br /> or higher positive displacement blower or a:'1regenerative biower rated for at feast C. <br /> standard cubic feet per minute:'(SCFM at a�yacuum of 4: <br /> -inches mercury, one or two � <br /> 200-pound vapor phase carbon vessels, }differentialressure gauges indicating <br /> pressure/vacuum in inches of water,`,dlfferen'tiaf` pressure or variable area flow meter <br /> -. 0-50 SUM, TedlarS bags, 2-inch Schedule';,40 PVC pip%ng' or 2-inch hose with quick <br /> connect coupling and appropriate wellhead fittings. <br /> It is anticipated that the test duration will be_ approximateI four hours (2-hour/well'-•. <br /> Test measurements will taken'6very 30 minutes or so. Me will measure extractia:i <br /> well air flow-rate, extraction well vacuum, anis baseline end test'vacuum/pressure st <br /> probes P-1 through P-3- <br /> Four extracted air samples (2 `per extraction} well) -will be€analyzed for the CQC:. <br /> These vapor samples collected in- Tedlarg) ''bags will �be analyzed by EPA Methal <br /> 8260_ Grab vapor samples 'collected from the soil probes °will be analyzed.for TPF I <br /> i <br /> and % oxygen by handheld instruments including a photoipnization detector: and i-t k <br /> LEL meter. , <br /> Test Results and Rg9ort :- <br /> A report of the findings of this SVE test will be prepared-for submittal to PHS l=HD' <br /> The report will include the well and probe construction details, site mops and <br /> geologic cross sections. The report will des&j6e and interpret test results includinC <br /> air flow-rates, well and probe vacuum, and soil gas analytical data. We will analyze <br /> the test data and develop estimates of the SVE radiu's of influence, initis! CQC " <br /> ' removal rates, and effectiveness of SVE in the sail stratattested. -We will assess the< <br /> feasibility of using SVE as an interim remediation measure based on the analysis o' <br /> test data and develop additional recommendations for full=scale. implementation i <br /> appropriate. . . <br /> Revision.1 Page 2 of 3 <br />