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06/25/2001 14 46 2094671 AGE 5TOCKTON PAGE 02 22 June 2001 AGE-NC Project No 97-0333 Page 4 of 10 Zone, 7-hard Water Zone and Primary Aquifer Zone from P-7,P-8,P-9 and P-10 Results of the December 2000 CPT investigation were reported in Cone Penetrometer Testing Site Investigation - Fourth Quarter 2000, dated 07 February 2001, prepared by ACME • 31 January 2001 -Ground water monitoring and sampling were performed at wells MW-1, -- MW-2,MW-3, MW-4 and MW-5 Ground Water levels were measured between 15 and 16 feet below the tops of the well casings, ground water flaw direction at the site was inferred to be flowing towards the north at an approximate gradient of 0 001 Laboratory analysis of ground water samples detected TPH-g at the site at concentrations as high as 120,000,uga, BTEX compounds were detected at concent>rabous as lugh as 23,000 Ag/l,MTBE.and TANTE were detected at concentrations as high as 950,000 ug/l Tetrachloroethene (PCE) was detected in a water sample collected from MW-4 at a concentration of 4,900 ,ugll, trichloroethene (TCE) from MW-5 at a concentration of 12 ,ugll, 1,2,3-tnehlorobenzene from MW-2 at a concentration of 51,000 pg/l and hexachlorobutadiene from MW-1 and MW-2 at concentrations as high as 30,000 ,ug/1 Results of the January 2001 investigation were reported in Quarterly Report-First Quarter 2001, dated 30 April 2001, prepared by AGE 30 March 2001 Ground water extraction well EW-1 and groundwater observation well 1\4W-6 were installed at the site for performance of aground water pumping test Soil borings EW-1 and vl-VV-6 were advanced vertically to depths of 45 feet below surface grade (bsg) Boring EW-1 was single-completed as a 6-inch diameter ground water extraction well and MW-6 single-completed as a 2-mch diameter ground water observation well with screen intervals between 20 and 45 feet bsg Soil and ground water samples wore not collected during this investigation Results of the March 2001 investigation were reported in. Ground Watef Aquifei Pumping Tes!Repart- Second Quarter 2001, dated 15 May 2001, prepared by AGE • 05 April 2001 - A ground water aquifer pumping testing was performed at the site to assess the general ground wateir aquifer characteristics and to assess aquifer response to ground water extraction utilizing wells EW-1, MW-1, UW-2, MWA and NfW-6 at a constant pumping rate of 6 gallons per minute, purged ground water was containerized on-site in a 6,500-gallon poly tank (Balser tank) From data collected during the pumping test, a transmissivity i slue was calculated at 955 ft-/day, a. storativity value calculated at 0 032, a hydraulic conductivity value of 0 013 cm/s and a radius of influence projected at 140 feet utilizing a smi-logarithmic plot of draN%-down versus distance Results of the March 2001 navest7gatiori were reported in G ound Water Aquifer Pumping Test Deport-Second Quay tel 2001, dated 15 May 2001, ptepai ed by AGE •