three well site check bldg lch-4022

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2.0 BACKGROUND2.1 Site DescriptionThe site is located on the north side of Marine Corps Base, Camp Lejeune, North Carolina (Figure 1).The site map (Figure 2) illustrates the location of the Building LCH-4022, and the location of the installedwells. According to past documents, one steel 1 ,OOO-gallon capacity underground storage tank (UST)used to store fuel oil was excavated and removed on June 28, 1992. GSI could not identify anyinformation documenting the age or condition of the UST when removed. According to the TankRemoval Report prepared for the site by Environmental and Regulatory Consultants, Inc.-onSeptember 17, 1992, two soil samples were collected for laboratory analysis during excavation activities.The samples were analyzed for the presence of total petroleum hydrocarbons (TPH)-asdiesel andTPH-as-gasoline by U.S. Environmental Protection Agency (EPA) Methods 3550 and 5030, respectively.Analytical results from the Tank Removal Report indicate that the soil sample collected at 2 feet belowthe north end of the UST contained 599 parts per million (ppm) TPH-as-gasoline and 4,300 ppm TPH-asdiesel.The soil sample collected at the same depth from the south end of the excavation contained 699ppm TPH-as-gasoline and 14,900 ppm TPH-asdiesel.2.2 Land and Water UseBuilding LCH-4022 is located approximately 2,500 feet south of Mott Creek. The area immediatelyadjacent Building LCH-4022 is comprised of buildings that house the Base personnel. The site issituated in an area dominated by relatively flat topography. The nearest body of surface water is MottCreek to the north. Potable water for the base is supplied by wells located approximately 1.5 milestowards the west that tap the Castle Hayne aquifer.2.3 Regional GeologyThe coastal plain consists of a layered sequence of unconsolidated sand, gravel, silt, and clay depositsof Miocene to Holocene age. These deposits and formations of Lower Cretaceous age, which overliebedrock of Pre-Cretaceous age, thicken and dip eastward with a thickness of 1,500 feet in the Camp *Lejeune area (Harned et al., 1989). The geologic units in the area are divided into six formations: the3
Castle Hayne Formation of the Eocene Series; the River Bend Formation of the Oligocene Series; theBelgrade, Pungo River, and Eastover Formations of the Miocene Series; the Yorktown Formation of thePliocene Series; and undifferentiated units of the Quaternary Series. The Castle Hayne Formation iscomposed of limestones and marls. The Castle Hayne Formation is overlain by the River BendFormation.4GFKWNDWATER%%%iii;SERVICIZS
Page 1 and 2: GR~uNDWATERTECHNOLOGYGroundwater Te
Page 3 and 4: LIST OF FIGURESPAGEFigure 1: Site L
Page 5: groundwater of the saturated zone.
Page 11: 3.0 INVESTIGATIVE METHODS3.1 Soil S
Page 16 and 17: METHOD 3550/8015(ppm)FORMER 1.000 G
Page 18 and 19: 4.3.2 Dissolved-Phase HvdrocarbonsG
Page 21 and 22: 5.0 RECOMMENDATIONSBased on the res
Page 25 and 26: GROUNDWATERTECHNOLOGYGOVERNMENT SER
Page 27 and 28: GROUNDWATERTECHNOLOGYGOVERNMENT SER
Page 29 and 30: GTE1ENVIRONMENTAL- LABORATORIES, IN
Page 31 and 32: - -MEADGBROZ lNDU6?RlAL-&K - CHAIN-
Page 33 and 34: ‘,.3Client Number: 830011088Proje
Page 35 and 36: Client Number: 830011088Project ID:
Page 39 and 40: ‘.Client Number: 830011088Project
Page 43 and 44: GTE1ENVIRONMENTALw LABORATORIES, IN
Page 45 and 46: 0 Ap!yeatj 0 wad use14 0 A~!A!s~JJ~
Page 47 and 48: APPENDIX CWell Survey Data
Page 49 and 50: APPENDIX DWell Gauging Data
Page 51 and 52: GROUNDWATERTECHNOLOGYGOVERNMENTSERV
Page 53 and 54: *FOR OFFICE USE ONLYTERRADYNE Site
Page 55: .ATERRADYNE ENVIRONMENTAL SERVICES,

three well site check bldg lch-4022

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