Stormwater Pollution Prevention Plan - Phoenix Sky Harbor ...

City of Phoenix
January 28, 2013
Page 2
PROJECT ACTIVITIES
Site Safety Plan - Prior to performing site activities, Four Corners developed a Site Safety Plan (SSP) for
the subject property to outline the scope of work and the potential health risks involved with the work
activities. The SSP reviewed potential on-site physical hazards, chemical hazards, monitoring procedures,
emergency procedures, and evacuation routes. Four Corners personnel who were on-site during the
investigative activities were required to review and sign the SSP prior to commencing the field activities.
Additionally, Four Corners attended one meeting on September 24, 2012 as requested by the City of
Phoenix to discuss and coordinate field activities.
Remediation Oversight - Four Corners conducted fuel impacted soil remediation oversight on September
24, 2012. Four Corners inspected soils along the southern bank of the Salt River channel to determine if
signs of fuel impacts, such as soil staining or odors, were present that would indicate a need for soil
remediation. Signs of fuel impacts were identified for approximately 0.3 mile long portion of a dirt
roadway on the southern bank of the Salt River channel, with a large stain on the western terminus of the
roadway stains, where the grader had stopped. The locations of soil staining is illustrated on Figure 1, Soil
Sample Locations, included in Attachment A, Figure. The City of Phoenix retained internal personnel to
conduct remediation activities, including using absorbent pads and materials, and various types of
excavation equipment as required for the project. Four Corners personnel observed the remediation of
impacted soil. Four Corners mapped the potential extent of the fuel impacts along the southern bank of the
Salt River channel and documented where stains or fuel-impacted soils were identified. Four Corners’
observations are retained in the project file.
Roadway staining was scraped for 0.3 miles and the stain observed on the western end of the impacted
roadway soil was excavated. The final excavation pit was approximately 15' x 75' x 5'. Approximately
300 tons of contaminated soil was removed.
Sampling Activities
Confirmation Sampling - At the completion of remediation activities, Four Corners conducted a visual
survey of the excavation zone for remaining soil staining and collected soil confirmation samples to provide
documentation of completion of remediation activities. Prior to submittal to the analytical laboratory, Four
Corners composited soil samples from stained soil along the roadway on the southern bank of the Salt
River channel from sample locations 12087-S1, 12087-S1A, and 12087-S1B into 12087-S1-Comp; 12087-
S2, 12087-S2A, and 12087-S2B into 12087-S2-Comp; and 12087-S3, 12087-S3A, and 12087-S3B into
12087-S3-Comp. However, soil samples collected for VOC analysis cannot be composited, and the
samples were collected from a representative location of the roadway as determined by field personnel
at a depth of approximately half an inch below the surface. Six samples were collected from the excavation
zone (12087-EX@3.5', 12087-EX@5', 12087-NW@3', 12087-E@4', 12087-SE@2.5', and 12087-W@3')
on the western terminus of the roadway staining. Twelve soil samples were submitted to the laboratory.
Four Corners Environmental, Inc.
960 North Sinagua Heights Drive, Flagstaff, Arizona 86004-7870 (928) 714-9374 (f) (928) 714-9375
10030 North 49 th Lane, Glendale, Arizona 85302-2417 (623) 931-2211 (f) (623) 931-2202