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1 <br /> iL , ' .. sr ' • - , '. <br /> 29. September 2000 <br /> AGE-NC Project No. 99-0657- f <br /> -Page•.3 of 4 <br /> •e� - is •. .. t .. . ,. - ,. -' - •. -. .t .: .. - '' , <br /> Current and previous analytical results ate summarized-on Table 2.The laboratory'report(MAI Lab " <br />' D No..46124 through 46129 QA/QC C re ort and chain-of-:custody form are,included'in A endix' <br /> ), Q . Q P. pP <br /> B <br /> 4:0. SUMMARY.AND CONCLUSIONS <br /> Based on,the data collected during this-monitoring period;:AGE concludes: <br /> Depth to.ground water at the site as of 28 August 2000 was approximately 12.00 feet below ; <br /> r surface grade,with'a north-northwest flow.direction: The hydraulic gradient is nearly flat. <br /> •_. The highest concentration of dissolved hydrocarbons quantified as-TPH-g, TPH-d, and <br /> generally BTE&X compounds extends northeast .from the former' USTs. Dissolved <br /> hydrocarbons were encountered.in the down-gradient direction f om the,former USTs lin <br />' samples frommonitoring'wells MW-2, MW-5 and MW-6. ' <br /> • The lateral extent of petroleum'hydrocarbon impacted ground water has'not been defined <br />'. toward the northeast beyond MW-5- and•MW-6. The hydrocarbon plume is fairly well' <br /> defined to the south, east and west.and northwest. <br /> 5.0'* RECOMMENDATIONS <br /> I ; Based'ori the findings"of this investigatiori,`AGE recommends: ; <br /> • Continued quarterly monitoring of the ground;water monitoring wells.The next monitoring <br /> r : <br /> event`should be performed inNovember 2040. <br /> • If-concentrations do ;riot decline significantly during the next monitoring'event, AGE <br /> I .;recommends.additional monitoring wells be'installed to the'northeastand east ofmonitoring ; <br /> well MW6 to'Auther assess the lateral extent of petroleum hydrocarbontimpacted ground <br /> f water <br /> I6:0. LIIVIITATIONS <br /> Our professional services were.'perford using that degree of care and.skill ordinarily'm' eercised by <br /> environmental-consultants practicing in•this -or,siinilar-loealitics. The findings were based upon <br /> analytical results fovided b an inde endent laborato .Evaluation of the h' dro eolo is conditions <br /> . . Yt P Y � P , . rY. . . - Y, g g ,. :. <br /> 'at the site for'the purpose of this investigation.was-made from a'.limite'd•number of available"data ; <br /> Advanced Geokn'vironmental,lnc. , <br />