REP46160

• Permit No: M1992069
• IBM Index Class Name: Report
• Doc Date: 5/6/2002
• Doc Name: Monitoring Report ‎(diesel)‎
• From: Paragon
• To: DMG
• Media Type: D
• Archive: No

' Ms. Connie Davis/Aggregate Industries - F Street April 2002 QMR/Closure Request
Project Number 1001018 Pl~Rl~~i~N
May 1, 2002
Page 3
northeasterly direction with a more northerly component on the east side of the site. As seen
from Figure 3a, the local groundwater flow direction appeared to be to the east-northeast in
the vicinity of the spill area with a northerly component east of the spill area on April 4,
2002. The hydraulic gradient was estimated to range from approximately 0.006 to 0.02 for
the overall site while the hydraulic gradient was estimated to range from approximately
0.001 to 0.006 for the spill area based on the April 2002 groundwater elevation data.
Historical information regarding the groundwater flow direction and hydraulic gradient is
summarized below.
Estimated Flow Estimated Estimated Flow Estimated
Date of Direction for Gradient for Direction for Gradient for
Monitoring Overall Site Overall Site Spill Area Spill Area
September 2001 Northeast with a 0.006 to 0.03 East-northeast. 0.002 to 0.006
Northerly component
on the east side of
the site.
October 2001 Northeast with a 0.009 to 0.02 Northeast with a 0.002 to 0.006
Northerly component Northerly
on the east side of component east of
the site. The spill area.
January 2002 North with a 0.004 to 0.02 East with a 0.002 to 0.02
Northwesterly Southeasterly
component on the component east of
east side of the site. The spill area.
April 2002 Northeast with a 0.006 to 0.02 East-northeast with 0.001 to 0.006
Northerly component a Northerly
on the east side of component east of
the site. the spill area.
The regional groundwater flow direction and hydraulic gradients estimated for the four (4)
events are generally consistent with each other. The local groundwater flow direction and
hydraulic gradients estimated for the four (4) events are generally consistent with each other
with the exception of the January 2002 flow direction, especially to the east of the spill area.
It should be noted that local geohydrologic characteristics such as flow direction and
gradient may change due to variations in precipitation and recharge or other conditions not
evident at the time of field exploration.