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I -:_i, . -,-,._.]� -.� .,•:_.F..�-� rte-.....-..r ,.._.,,"...,- _.- -..:�,, n- -- 23 September,2.004 - •A`GE-NC Project No. 98-0440 Page 2 of 4 , 2.2.- COLLECTION OF GROUND WATER SAMPLES " r A water sample wascollectedfrom each'_purged well using'a new disposable,plastic bailer. To _. ; sample DW5 f57 and DW5055,-4 hose bib was opened on the water'storage tank"and'samples were collected from the tank while,the pump was operating to.obtairi a fresh water sample. All samples were transferred into one 1-liter amber-.bottle-without.sample preservative and into three 40-m1 volatile organic `analysis (VOA) vials containing 0.5 ml 18% hydrochloric ''acid as a sample ' preservative. After collection, the samples were properly labeled';placed in a chilled container and transported under chain-of-custody to McCarnpbell Analytical. Inc. (MA)i Each sample was analyzed for: Total petroleum h drocarbons uantified- as asoline"and "diesel' TPH= and TPH-d,- - respectively) d • p Y 9 g . . ( g , ' • respectively)-by EPA Method 8015M; and ' • Benzene toluene ethyl benzene and x lene BTEX and meth l-terti butyl ether MTBE � Y Y ( ) Y �Y Y (MTBE) by EPA Method 8021.. .3.0. , FINDINGS . Ground water elevation, flow direction, and gradient were determined from field data collected on I' 21 June 2004: The hydrocarbon impact to soil and groundwater was quantified•by the laboratory analytical data. ' . 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION I' Depfhs to ground water ranged from 12.52 feet to13:25` feet.below the well casing tops. Ground water.elevations at the site ranged'fr`om 26.44 feet•above mean sea level (MSL) in well MW-12 to '27.91 feet above MSL in well MW-l. Groundwater levels were within the screened intervals of all the monitoring wells on=site. ••The ground water flow direction'was inferred,using ground water elevation,data.-Theground water at the site on 21 'June 2004;was-'nferred to be flowin 'to the north-northwest.under an average g g gradient of 0.006 foot/foot across the area monitoied.,Figure 3 illustrates the groundwater elevation Lcontours. . r Advanced"Environmental,Inc.