|SUBSURFACE & GROUNDWATER INVESTIGATION AND REMEDIATION
Groundwater quality is a key issue for Guam and the CNMI. APEC personnel have extensive
experience in subsurface and groundwater investigation, characterization, and remediation.
APEC also provides supply, injection and monitoring well design; drilling and well completion
oversight; pump testing and down-hole camera well logging and video recording services.
Installation of Harmon Groundwater Monitoring Wells: APEC provided project management
and oversight for the construction of three monitoring wells in Harmon, Guam. Responsibilities
included: driller selection and contracting, site selection, project scheduling and coordination,
supervision of drilling, lithological and hydrogeological evaluation, well design, well construction
and completion of subsequent water sampling for analyses. Installation of a fourth well is
currently underway. Client: Guam Environmental Protection Agency.
Down-hole Camera Well Logging and Video Recording: APEC conducted down-hole well
logging and video recording services to aid in visual well logging and visual well integrity
inspection. Clients: CNMI Division of Environmental Quality (DEQ) and Saipan hotels including
Hafa Adai Beach Hotel, Nikko, Hyatt, and Aqua Resort.
Saipan Lagoon Groundwater Seep Investigation, Saipan, CNMI: APEC is currently
conducting a yearlong investigation of Saipan Lagoon groundwater seeps on behalf of DEQ.
Project activities include identifying, locating, and measuring flow rates and nutrient output of
lagoonal groundwater seeps in Saipan Lagoon, CNMI. Client: CNMI Division of Environmental
Quality (DEQ) and Coastal Resources Management Office (CRMO).
Groundwater Potentiometric Surface Investigation Kagman, Saipan, CNMI: APEC
conducted a groundwater potentiometric surface investigation in Kagman, Saipan on behalf of
Shell Guam, Inc. to determine the direction of groundwater gradients in the vicinity of a proposed
service station. Client: Shell Oil Guam Inc.
Subsurface Investigation of JP-8 Fuel Release, Toto, Guam: APEC conducted an
investigation and characterization of subsurface contamination resulting from the release of JP-8
jet fuel from a leaking fuel line in Toto, Guam. Activities included preparation of health and safety
plan and site investigation plan, oversight of fuel vault excavation, test pit excavation, soil and
water sampling and analyses, daily reporting and contaminant delineation. Client: Raytheon
Technical Services Guam and U.S. Navy, COMNAVMAR.
Remedial Subsurface Investigation at Saipan International Airport, CNMI: APEC
conducted an investigation and characterization of subsurface and groundwater contamination
resulting from the release of approximately 6,000 gallons of jet fuel from an underground fuel
pipeline. Monitoring and remediation activities have been ongoing since the start of the project in
2001. APEC oversaw the design and installation of the soil vapor extraction system. Site activities
include obtaining groundwater samples for laboratory analysis, and the operation, maintenance
and effluent sampling of soil vapor extraction equipment. Responsibilities included coordination
with regulatory agencies; oversight of operations, permitting, and materials procurement; and
quarterly reporting. Client: CNMI Commonwealth Ports Authority.
Mobil Oil Guam, Inc. Liguan Underground Storage Tank Removal, Dededo, Guam: APEC
performed excavation of a 6,000-gallon diesel fuel UST, and characterized the subsurface
contamination surrounding the UST. Client: Mobil Oil Guam, Inc.
Remedial Subsurface Investigation at Andersen Air Force Base, Guam: APEC conducted
an investigation and characterization of subsurface contamination resulting from the release of
approximately 2,000 gallons of jet fuel from a severed underground fuel pipeline. Remediation
activities include design and oversight of the installation of passive soil venting wells in
combination with the application of Oxygen Releasing Compound, as an alternative remediation
strategy. Responsibilities included communication with regulatory agencies, contractors and Air
Force representatives; oversight of operations; coordination of surveying, permitting, materials
procurement and other related activities. Client: Nova Group Inc.
Remedial Groundwater Investigation at the Former Exxon Service Station, Chalan Pago,
Guam: APEC conducted an investigation and characterization of subsurface and groundwater
contamination resulting from a leaking underground petroleum storage tank. Monitoring and
remediation activities have been ongoing since the start of the project in 1998. APEC oversaw
the design and installation of subsurface remediation systems including product recovery, pump
and treat air stripping, catalytic oxidation, soil vapor extraction, air sparge and granulated
activated charcoal filtration. Ongoing site activities include obtaining groundwater samples and
water levels from 15 monitoring wells and the operation and maintenance of remediation systems.
Responsibilities include coordination with regulatory agencies; oversight of operations,
permitting, and materials procurement; monthly and quarterly reporting. Client: ExxonMobil
International Holdings, Inc.
Remedial Subsurface and Groundwater Investigation at the Barrigada Exxon Service
Station, Barrigada, Guam: APEC performed oversight of the investigation, characterization,
monitoring and remediation of groundwater contamination resulting from a leaking underground
petroleum storage tank. Responsibilities included communication with regulatory agencies and
Exxon representatives; oversight of operations; coordination of surveying, permitting, materials
procurement and other related activities. Client: ExxonMobil International Holdings, Inc.
Subsurface Investigation, Guam Reef Hotel, Tumon, Guam: APEC performed a subsurface
investigation, including the collection and analysis of soil samples for the purpose of obtaining
regulatory approval for closure of a former underground storage tank (UST) site. Client: Guam
Agana Shopping Center Wetlands Investigation for Potential TPH Contamination, Agana,
Guam: APEC developed a Site Investigation Plan; performed subsurface investigation, including
the collection and analysis of soil samples; and produced a Site Investigation Report to delineate
the extent of horizontal and vertical contamination in accordance with three environmental
protection objectives: the protection of Guam’s ground and surface water, limitation of human
health risk by exposure management, and limitation of ecological risk. Client: Agana Shopping
Underground Storage Tank (UST) Decommissioning, Excavation, Cleaning & Disposal;
Subsurface Investigation and Remediation, Saipan, CNMI: APEC performed planning and
project management for the decommissioning, excavation, cleaning and disposal of 1,000 gallon
fiberglass UST; related subsurface investigation; and remediation for petroleum hydrocarbons
soil contamination. Responsibilities for site remediation included oversight of bioremediation
berm construction and maintenance; soil sampling and related reporting; and regulatory agency
communication. Client: CNMI Commonwealth Ports Authority.