Laserfiche WebLink
29 March"2002. <br /> AGE-NC.Project No. 99-0637 . <br />" Page 6 of 6 <br /> k has been defined. Petroleum hydrocarbon-iiiipacted soil does not extend vertically past 20 <br />" feet bsg and MTBE-impacted soil does"not extend vertically past 30 feet bsg. The-lateral <br /> extent.is confined to.the monitoring.well network on-site (Figures 4; 5 and 6). <br /> " TPH-g was detected in the ground water sample collected from MWS at'a concentration of <br /> 1"10'µgll;just exceeding the laboratory reporting limit.MTBE-was detected by EPA Method <br /> " <br /> . 8020 in the ground water samples collected from MW1,MW2, MW4, MW5.and MW6 at <br /> :concentrations""as high, as 3,900"µg/l (MW4) and confirmed by EPA.Method.8260 in the <br /> same samples at concentrations as high as 4,200 gg/l No other analytes were detected in the <br /> groundwater samples collected at the site. The lateral extent"of MTBE4rnpacted-ground = <br /> water has only been defined toward the south and east. The current MTBE isoconcentration <br /> map is"depicted on Figure 7. <br /> 5.0. ` RECOMMENDATIONS'" <br /> Based.on the,findings of the environmental activities recounted in this report;'AGE recommends: <br /> Continued quarterly monitoring of the:ground"water monitoring wells" on-site. The"next <br /> monitoring event should be performed in April 2002. <br /> r - Two additionalmonitoring wells be installed northwest:ofwell MW5 and west of monitoring <br /> well MW6 to further.assess the lateral exteriY ofMTBE-impacted ground water <br /> 6.0. " LIMITATIONS <br /> Our p-rofessional services were performed"using that degree,of care and skill ordinarily exercised by <br /> environmental consultants"practicing in this or similar localities. The findings were based upon - <br /> analytical results provided by an independent laboratory:Evaluation-ofthe.hydrogeologic conditions". <br /> at the..site for the',purpose of this investigation was made from a limited-number of available data <br /> points (soil.and"ground water samples) and subsurface conditions may vary awayfrom these.data <br /> points. No other warranty, expressed or implied, is made"as to the professional recommendations <br /> contained-in this report. <br /> Advanced GeoEnvi ron mental,Inc- <br />