HomeMy WebLinkAboutACSA201100095 Other 1993-03-02 _J-/YDROSYSTEMS INC
March 2, 1993
Mr. Harry Montague, President
GOCO OIL Company
924 Harris Street
Charlottesville, VA 22901
RE: Site Selection for New Water Supply Well, Shadwell Store, Route 250.
Dear Mr. Montigue:
Per your request, I have analyzed the groundwater data for the above referenced Site to
determine the best location for the placement of a new water supply well on GOCO's property.
The data I reviewed is contained in the June 12, 1990 report HYDROSYSTEMS prepared for
submission to the Virginia State Water Control Board and is titled "Site, Risk, and Remediation
Assessment of Groundwater Contamination at the Shadwell 76 Station, Shadwell, Virginia". As
you are aware, the current water supply well is contaminated with petroleum, mainly in the form
of gasoline type compounds. Benzene concentrations greatly exceed the U.S. EPA and Virginia
Drinking Water Standard of 5 ppb. Benzene is a known carcinogen.
To evaluate potential new water supply well locations on GOCO's property, I reviewed all of
the existing data including water quality, groundwater flow direction, potential sources of
contamination, geologic conditions, and available area. Because of the existing severe
contamination in the upgradient areas of the site, the use of a septic field to the north of the
Station, the existence of an underground storage tank, unpaved dispensing areas, and
groundwater flow to the northwest, HYDROSYSTEMS has determined that most of the property
is absolutely unsuitable for the installation of a water supply well. Wells placed within this
area will either immediately encounter contaminated groundwater or will upon usage draw in
contaminated groundwater from other areas of the site once the well is placed in operation.
This leaves one small area at the southern point of the site. Placing a water supply well here
will be a gamble at best. Well MW-4 was contaminated with total petroleum hydrocarbons just
above the Virginia Drinking Water Standards. The source of this contamination is not known.
In addition, the most highly contaminated monitoring well on site is only 135 feet away at the
loading rack. It is very possible that a water supply well in this location will draw in
2340 Commonwealth Drive • Suite 202 • Charlottesville • VA • 22901
(804) 973-9740
r.
Mr. Harry Montague
March 2, 1993
Page 2
contaminated groundwater from the site to the north. In my experience, this is not an
uncommon occurrence. I am currently working on a case in Albemarle County where a new
well drilled 250 feet up hill from an area of gasoline contamination became contaminated after
it was put into use. Everyone assumed the well was far enough away and was upgradient of the
contamination. Because of the fractured nature of the bedrock aquifer systems in Albemarle
County, the influence of a pumping well can reach long distances along those fractures, even
pulling in groundwater from downgradient areas as was seen in this case.
Because of the severity of the groundwater contamination at this site and the existing geologic
conditions, HYDROSYSTEMS cannot recommend the placement of a water supply well on the
GOCO property. We are not comfortable with the minimal isolation distances available. We
would instead recommend that a location on one of the surrounding properties be considered or
if possible tapping into the proposed water main.
If you have any questions concerning this letter report or if you wish to pursue potential off-site
well locations, please contact me at your convenience.
s T ly,
e freyA. Sitler, CPG
Executive Vice President
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----1 Figure 4. Site plan showing the topography and boring/monitoring well locations at the Shadwell "76" Station, Shadwell,
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co
n
um en GOCO, INC. vri}tA-
P.O. BOX 1404 rwq
CHARLOTTESVILLE, VA.
22902
1Y.3 1
February 16, 1993
90`nn r1 rs Deed.
Mr. V. Wayne Cilimberg
County of Albemarle
Dept. of Planning & Community Development
401 McIntire Road
Charlottesville, Va. 22902-4596
Re: Application for Jurisdictional Area Amendment
Dear Mr. Cilimberg:
It is our desire not to have our application for a
Jurisdictional Area Amendment deferred again. If Mr. Booth
should need another delay, we feel that our circumstances
warrant that we be given seperate consideration.
If necessary, we would be willing to file a seperate
application, as the only reason we filed jointly was at Mr.
Booth's request.
As you know, our circumstances are quite different. We have
a documented problem with ground water on our site, and
desire to obtain potable water for our existing business.
Mr. Booth, on the other hand, would like a water tap for
possible future development of his site.
In light of our differing circumstances, we therefore
request that our application be given consideration at your
scheduled meeting on March 3 , 1993 .
If you have any questions, or need any further action from
us, please give me a call .
Sincerely,
hrtiuojn.
Harry M. Montague
President, GOCO, Inc.
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