HYDRO26631

• Permit No: M1992069
• IBM Index Class Name: Hydrology
• Doc Date: 9/23/2002
• Doc Name: July 02 Quarterly Monitoring Report Request for Site Closure
• From: Paragon Consulting
• To: DMG
• Permit Index Doc Type: Other Ground Water
• Media Type: D
• Archive: No

Ms. Connie Davis/Aggregate Industries - F Street July 2002 QMR/Closure Request
Project Plumber 1001018 P/1RflGON
September 20, 2002
Page 3
from Figure 3a, the local groundwater flow direction appeared to be to the northeast in the
vicinity of the spill area with a northerly component east of the spill area on July 29, 2002.
The hydraulic gradient was estimated to range from approximately 0.005 to 0.02 for the
overall site while the hydraulic gradient was estimated to range from approximately 0.002 to
0.005 for the spill area based on the July 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.
July 2002 Northeast with a 0.005 to 0.02 Northeast with a 0.002 to 0.005
Northerly component 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 five (5)
events are generally consistent with each other. The local groundwater flow direction and
hydraulic gradients estimated for the five (5) events aze generally consistent with each other
with the exception of the January 2002 flow direction and gradient, especially the Ilow
direction 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 vaziations in
precipitation and recharge or other conditions not evident at the time of field exploration.