HomeMy WebLinkAboutSUB200800211 Review Comments Groundwater Assessment 2008-10-20Tier III
Groundwater Assessment (Revised)
of
Jefferson Ridge (Formerly Woodridge) Subdivision
Albemarle County, Virginia
Prepared
For:
Barry Meade Homes, LLC
140 South Pantops Drive, Suite 200
Charlottesville, Virginia 22911
Submitted
To:
Josh Rubenstein, Groundwater Manager
Albemarle County Office of Community Development
401 McIntire Road
Charlottesville, Virginia 22902
Prepared
by:
True North Environmental, LLC
Charlottesville, Virginia
Date:
October 14, 2008
Tier III Groundwater Assessment
Report (Revised)
Of
Jefferson Ridge (formerly Woodridge)
Albemarle County, Virginia
Prepared
For
Barry Meade Homes, LLC
I40 South Pantops Drive, Suite 200
Charlottesville, Virginia 22911
Prepared by:
True North Environmental, LLC
Analytical Services, Inc.
lee
Michael Maloy, CPG
Analytical Services, Inc.
S
Vincent L. Day
True North Environ tal
Date:
October 14, 2008
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L. MALOY
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Table of Contents
Key Findings
1.0 INTRODUCTION .................................................................. ..............................1
2.0 SITE DESCRIPTION ............................................................. ..............................1
2.1 Topography ....................................................................... ..............................1
2.2 Surface Water Drainage .................................................... ..............................1
2.3 Planimetric Features .......................................................... ..............................1
2.4 Land Use ........................................................................... ..............................1
3.0 PROPOSED DEVELOPMENT LAYOUT AND APPROXIMATE LAND
DISTURBANCE..................................................................... ..............................2
4.0 GROUNDWATER AVAILABILITY .................................... ..............................2
4.1 Estimated Groundwater Flow Direction ........................... ..............................4
5.0 POTENTIAL SOURCES OF CONTAMINATION .............. ..............................4
5.1 Site Reconnaissance .......................................................... ..............................5
5.2 Sensitivity Mapping .......................................................... ..............................5
5.3 Regulatory Data Base Review .......................................... ..............................5
6.0 HYDROGEOLOGY ............................................................... ..............................6
6.1 Review of Geologic Mapping ........................................... ..............................6
6.2 Review of Soils Mapping .................................................. ..............................6
6.3 Photolineation Interpretation/Fracture Trace Analysis ..... ..............................7
6.4 Summary of Hydrogeologic Conditions ........................... ..............................7
7.0 BEST MANAGEMENT PRACTICES .................................. ..............................8
8.0 CONCLUSIONS ..................................................................... ..............................9
List of Tables
Table 1 Well Data Descriptive Statistics: Well Yield (gallons per minute)
Table 2 Well Data Descriptive Statistics: Casing Length (in feet)
Table 3 Calculated Ksat Values for each Hydrogeologic Unit
Table 4 Well Data Summary
List of Figures
Figure 1
Site Location Map
Figure 2
Site Layout Map
Figure 3
Groundwater Availability Map
Figure 4
Estimated Groundwater Flow Direction Map
Figure 5
Groundwater Sensitive Area Map
Figure 6
Geologic Map
List of Appendices
Attachment A Preliminary Plat (Sheets 2 &3)
Appendix B EDR- EnvironmentaURegulatory Records Review
Key Findings
Based upon the results of the Tier III Groundwater Assessment of the Jefferson Ridge
Subdivision, the following key findings can be reported:
• Hydrogeologic units: VIII (Piedmont proper)
• Groundwater availability zone: Class 1 (lowest relative groundwater
availability)
• Hydrogeologic conditions favorable to proposed use? yes
• Site within groundwater sensitivity zone? no
• Groundwater flow pattern: local: southwestward with discharge into Briery
Creek
• Contamination threats on record: no
• Additional contaminant threats observed in field reconnaissance? none
• Impacts of proposed use on existing users: none.
• BMP recommendations: Maintain undisturbed forest cover as much as possible
during development; implement runoff - neutral site plans on individual lots insofar
as practicable.
Tier III Groundwater Assessment True North Environmental
Jefferson Ridge Subdivision Project No. 05 -090
Albemarle County, Virginia October 14, 2008
1.0 INTRODUCTION
True North is pleased to submit this Tier 3 groundwater assessment report on the Barry
Meade Homes Development Property. The report has been prepared to address the
requirements within Section 206 of the Albemarle County Design Standards Manual. The
subject property consists of the following tax map parcel identifications as assigned by
Albemarle County: TMP 124 -2, TMP 124 -5 and TMP 124 -6 (Attachment A -Sheet 2).
The proposed area of development is comprised of approximately 675 acres which will
be divided into approximately fifty -five (55) planned residential lots possessing three (3)
preservation tracts (Attachment A -Sheet 3). The planned residential development will be
serviced by individual well and septic systems.
2.0 SITE DESCRIPTION
2.1 Topography
The subject property consists of approximately 675 -acres situated roughly parallel to
Route 618 (Figure 1). Topography varies from a high of approximately 520 feet above
mean sea level (amsl) near the southwestern property boundary to approximately 390 feet
amsl along Briary Creek, which flows (to the south) through the central portion of the
property.
2.2 Surface Water Drainage
Surface water drainage on the subject property is dictated by the presence of Briery Creek
and several associated, unnamed tributaries. Drainage likely flows from greater
topographic elevations into the swales formed in association with Briary Creek. Briary
Creek flows to the south where it contributes to the Hardware River.
2.3 Planimetric Features
The subject property is currently undeveloped (densely wooded) and no planimetric
features were identified within the site boundaries (Figure 2). Residential structures are
located directly to the north, south, and west of the property boundaries. Areas to the east
of the property are forested and assumed undeveloped.
2.4 Land Use
True North obtained and reviewed planimetric mapping from Albemarle County to aid in
assessing land use in the larger site area. The subject parcel is wooded and currently
undeveloped. Adjacent properties are either undeveloped or developed with residential
housing. Using the planimetric mapping, True North identified approximately 44
structures within approximately 1000 feet of the site boundary. It is expected that each of
these structures are serviced by individual wells and drainfields. The subject site is
currently zoned as RA (Rural Area).
Page 1 of 9
Tier III Groundwater Assessment True North Environmental
Jefferson Ridge Subdivision Project No. 05 -090
Albemarle County, Virginia October 14, 2008
3.0 PROPOSED DEVELOPMENT LAYOUT AND APPROXIMATE LAND
DISTURBANCE
The development is composed of approximately fifty -five (55) planned residential lots
that include three (3) preservation tracts (Attachment A). Land disturbance will be
limited to the individual lots and access roads as indicated on the site layout. This
acreage disturbance would be expected to be limited to the vicinity of the residential
construction sites including each site's septic drainfield. Care would be taken to limit
any unnecessary land disturbance, particularly on steeper sloping topography. Any
additional disturbance would be expected to be limited to necessary storm water
management and/or recommended BMP structures.
4.0 GROUNDWATER AVAILABILITY
The planned residential development will be serviced by individual wells and septic tank
drainfields systems. Albemarle County Groundwater Availability Mapping indicates
that the entire site lies within the Category 1 (Low) Groundwater Availability Zone
Designation (Figure 3).
The subject site lies within hydrogeologic unit VIII, which was defined during the Phase
II Albemarle County Hydrogeologic Assessment. Hydrogeologic unit VIII, was
recognized as the "Piedmont Proper" unit within the Albemarle County Hydrogeologic
Assessment Phase II Report. The following description of the mapped hydrogeologic
unit, along with pertinent tabulated summaries of well data and Ksat values, has been
obtained from the Hydrogeologic Assessment Phase II Report:
Piedmont Proper VIII: The Piedmont Proper unit is characterized by gently rolling
piedmont topography along the County's eastern border. The bedrock geology
underlying the unit is mapped as metagraywacke, quartzose schist and melange. Soils
range from shallow and somewhat excessively well drained to deep and well drained.
Slopes range from 2 -45 %.
Page 2 of 9
Tier III Groundwater Assessment True North Environmental
Jefferson Ridge Subdivision Project No. 05 -090
Albemarle County, Virginia October 14, 2008
Table 1
Well Data Descriptive Statistics: Well Yield (gallons per minute)
Unit No.
Unit
Sample
Mean
Standard
Minimum
Maximum
1
Name
Size
Deviation
VIII
Piedmont
277
11.35
10.97
1.00
75.00
Proper
Table 2
Well Data Descriptive Statistics: Casing Length (in feet)
Unit No.
Unit
Sample
Mean
Standard
Minimum
Maximum
1
Name
Size
Deviation
VIII
Piedmont
310
50.28
24.80
3.00
322.00
Proper
Table 3
Calculated Ksat Values for each Hydrogeologic Unit
Unit Number
Unit Name
Mean Ksat
(inches per hour)
Category Rating
VIII
Piedmont Proper
0.10
1
True North evaluated available well data from the Albemarle County Well Database to
determine casing length and reported yield values for wells in the nearby area. Nearby
wells (20), within approximately 2,000 -feet of the property boundaries, were selected and
their corresponding data evaluated. Based on the Albemarle County well database shape
file, it appears that two (2) of the wells are located within the subject property boundary.
However, based on the location of these wells on the map (in densely forested areas), it
appears likely that the coordinates provided are slightly erroneous and the wells are
associated with two (2) of the forty -four (44) residential structures noted to be present
within 1,000 -feet of the property boundaries. Of the twenty (20) wells, casing lengths
ranged from 30 feet to 67 feet with an average casing length of 54 feet. Casing length
measurements can be used as an approximate indicator to the depth of bedrock and
thickness of overburden (soil/saprolite). The total well depths ranged from 50 feet to 230
feet with an average total depth of 105 feet.
Of the twenty (20) selected wells, eight (8) did not have any available data for well yield
other than a "0" value. Based on our understanding that zeros were previously entered in
the database when no information was available, it is unclear as to whether or not these
sites represent dry holes with no yield. Of the twelve (12) wells that reported a yield, the
Page 3 of 9
Tier III Groundwater Assessment True North Environmental
Jefferson Ridge Subdivision Project No. 05 -090
Albemarle Countv. Virginia October 14. 2008
yield ranged from five (5) to thirty -five (35) gallons per minute. The average yield of the
twelve (12) wells was approximately seventeen (17) gallons per minute.
The following table summarizes the well data that was evaluated.
Table 4
Well Data Summary
Well Identification
Total Depth
(Feet)
Casing Depth
(Feet)
Reported Yield
(GPM)
101 -93 -0196 115
165
56
35
101 -93 -0024 115
61
61
0*
101 -93 -0416 115
165
67
0*
101 -87 -0421 124
105
50
10
101 -93 -0015 124
90
40
30
Scottsville -002 (5351)
95
48
15
101 -86 -0336 124
95
48
0*
Scottsville -002 (5352)
100
50
10
101 -87 -0352 124
125
62
0*
101 -99 -0163 115
83
58
15
101 -92 -0389 124
60
59
5
Scottsville -002 (5353)
125
62
20
101 -85 -0459 124
72
46
0*
101 -93 -0027 124
125
65
0*
101 -92 -0485 115
55
54
0*
101 -94 -0287 115
80
62
25
101 -88 -0319 124
50
50
0
101 -93 -0454 124
94
49
20
101 -95 -0386 115
130
30
12
101 -97 -0110 115
230
60
8
* Represents potential anomalous data
4.1 Estimated Groundwater Flow Direction
Estimated groundwater flow patterns are believed to roughly correspond to site
topography. An illustration of the estimated direction of groundwater flow at the site is
provided as Figure 4. Drainage divides on the subject property are likely located along
areas of greater topographic elevations, between Briery Creek and its associated unnamed
intermittent tributaries (Figure 5).
5.0 POTENTIAL SOURCES OF CONTAMINATION
True North performed site reconnaissance, reviewed available Sensitivity Mapping from
the Albemarle County Phase II Report, and obtained a regulatory database review of the
site area (EDR Survey) to identify any potential sources of contamination.
Page 4 of 9
Tier III Groundwater Assessment True North Environmental
Jefferson Ridge Subdivision Project No. 05 -090
Albemarle County, Virginia October 14, 2008
5.1 Site Reconnaissance
The majority of the property was found to be wooded and relatively undisturbed. During
site reconnaissance, no permanent structures were identified within the property
boundaries. Several flowing ( unnamed /intermittent) tributaries of Briery Creek
(including the creek itself) were noted to be present on the property. Several domestic
debris piles, including washing machines, stoves, and lawn mowing equipment were
noted to be present along the access road leading through the central portion of the
property. A burned down camping trailer was also noted to be present along the property
access road, near Route 618. Overhead power lines were observed transecting the
southwest and extreme southern portions of the subject site. The approximate locations
of the debris piles and burned trailer site have been illustrated in Figure 2.
5.2 Sensitivity Mapping
Based on a review of the County Sensitivity Mapping, two (2) areas mapped as sensitive
were recognized within proximity to the subject site (Figure 6). A former leaking
underground storage tank site assigned Virginia Department of Environmental Quality
(DEQ) Pollution Complaint Numbers (PC# 1993 -0705 and PC# 1993 -0919) is located
near Woodridge, Virginia, and is identified as the Woodridge Market. The two (2)
releases of petroleum were reported on October 2nd and November 4th of 2002. Both
pollution complaint cases are reported as closed by the DEQ. The site lies greater than
one -mile from the subject property. Review of the mapping indicates the 2000 -foot
radius sensitive areas associated with the leaking underground storage tank site lies well
to the north/northeast of the subject property. No other identified sensitive areas were
noted to be within close proximity to the subject property.
5.3 Regulatory Data Base Review
As part of this assessment, True North reviewed information sources to obtain existing
information pertaining to a release of hazardous substances or petroleum products on or
near the subject property. True North obtained an ASTM site search report from
Environmental Data Resources (EDR), Incorporated (Appendix B). The subject property
was not listed in any of the federal or state databases reviewed. No sites with
environmental concerns were listed within the minimum search distances specified in
ASTM E1527 -00.
The database search also provides a list of orphan sites occurring in the general vicinity
of the subject site. However, orphan sites do not have sufficient address information to
be accurately located on the site map. The Woodridge Market site was listed in the EDR
report's orphan summary.
Page 5 of 9
Tier III Groundwater Assessment True North Environmental
Jefferson Ridge Subdivision Project No. 05 -090
Albemarle County, Virginia October 14, 2008
6.0 HYDROGEOLOGY
6.1 Review of Geologic Mapping
According to the Albemarle County Geologic map, the subject site is underlain by
Cambrian aged stratified rocks of the Western Piedmont Province (Figure 6). The rock
types are described as metagraywacke, quartzose schist, and melange.
The following descriptions of the bedrock and soils were provided within the Albemarle
County Phase II Hydrogeologic Assessment Report.
The Piedmont Proper unit is characterized by gently rolling piedmont
topography. The bedrock geology underlying the unit is mapped as
Metagraywacke, quarttoze schist and melange. Soils in the unit area are
dominated by the Nason and the Manteo in nearly equal percentages. Although
these same soils also dominated the Candler unit, it should be noted that the
Manteo soils were nearly twice as prevalent as compared to the Nason. Manteo
soils are shallow and somewhat excessively drained. The Manteo soils are
formed in the weathered products of sericitic schists/phyllites on uplands and
range in slope from 2 -45 %. The Nason soil series are deep and well drained and
are also formed in the weathered products of sericitic schist. The Nason soils are
formed on uplands and range in slope from 2 -25 %.
No appreciable bedrock exposures were observed during the site reconnaissance. Quartz -
rich metamorphic rock fragments and boulders were identified within the unnamed
tributaries of Briary Creek. The majority of the rocks observed most closely resembled
diabase with distinct foliation patterns.
6.2 Review of Soils Mapping
True North has reviewed the Soil Survey of Albemarle County for the purposes of this
report. Five different soil series were mapped within the site's property boundaries. A
copy of the soils map for this area, including detailed descriptions of the five (5)
identified soil series, have been included in Appendix D.
The lowest topographical areas (along Briery Creek and its' unnamed tributaries) are
predominantly characterized by the presence of the Wehadkee (95) soil series. The
Wehadkee series is characterized as deep, nearly level, poorly drained silt loam soils.
Slopes where the Wehadkee is dominant typically range from 0 to 2 percent. The
portions of the site where intermittent drainages extend the furthest from Briery Creek are
characterized by the presence of the Lignum (46B) soil series. The Lignum series is
characterized as deep, moderately well drained to somewhat poorly drained silt loam
soils. Slopes where the Lignum is dominant typically range from 2 to 7 percent.
Page 6 of 9
Tier III Groundwater Assessment True North Environmental
Jefferson Ridge Subdivision Project No. 05 -090
Albemarle County, Virginia October 14, 2008
Areas surrounding the Wehadkee soil series are characterized by the presence of the
Manteo (5113, 51C, and 51D) soil series. The Manteo series is also sparsely present on
and along minor ridgetops. Manteo channery silt loam soils are generally described as
shallow and somewhat excessively drained. Slopes vary from 2 to 7 percent (51B), 7 to
15 percent (51C), and 15 to 25 percent (51D) respectively. Estimated Ksat values for the
Manteo, as illustrated in the Phase II Albemarle County Hydrogeologic Assessment
Report, ranged from 0.006 inches/hour to 0.39 inches/hour.
The most abundant soil type identified at the site is the Nason (62B & 62C) soil series.
The Nason series is characterized as deep, well drained silt loam soils. The 62B Nason
soils are located on the gently rolling topography (2 to 7% slopes) whereas the 62C soils
are located on the site's steeper slopes (7 to 15% slopes). Estimated Ksat values for the
Nason, as illustrated in the Phase II Albemarle County Hydrogeologic Assessment
Report, ranged from 0.007 inches /hour to 0.02 inches /hour.
Soils from the Tatum (80B) series are noted to be sparsely present along ridgetops
located within the property boundaries. Tatum silt loam soils are generally described as
deep and well drained. Slopes vary from 2 to 7 percent. Estimated Ksat values for the
Tatum, as illustrated in the Phase II Albemarle County Hydrogeologic Assessment
Report, ranged from 0.00 inches/hour to 0.03 inches/hour.
6.3 Photo Lineation Interpretation/ Fracture Trace Analysis
Stereoscopic analysis of aerial photographs was performed for the purpose of identifying
fracture traces or lineaments across the site area. A stereo pair of photographs (NAPP,
40000 scale) were obtained from the United States Geological Survey (USGS). The
photographs were dated March 24, 2000 and were representative of leaf -off conditions.
The aerial photographs were stereoscopically analyzed with a stereoscope for the
presence of straight -line features representative of zones of fracture concentration or
lineaments.
Seven (7) prominent, or primary fracture traces were observed from the USGS
photographs in the area of the site. The majority of these lineations lie along Briery
Creek and its' unnamed intermittent tributaries. These observed lineations were
transferred to a USGS topographic base map and are presented graphically in Figure 1.
The lineations were noted to generally lie in a west - northwest orientation.
6.4 Summary of Hydrogeologic Conditions
Based on the findings of this report, the site characteristics appear to conform to the
Relative Groundwater Availability Rating as published for the site in the Phase II
Albemarle County Hydrogeologic Assessment Report. The site is underlain by Cambrian
aged stratified rocks of the Western Piedmont Province. The rock types are described as
metagraywacke, quartzose schist, and melange. The site would appear to have somewhat
favorable conditions for groundwater wells for individual residential supply, although the
presence of dry wells is entirely possible.
Page 7 of 9
Tier III Groundwater Assessment True North Environmental
Jefferson Ridge Subdivision Project No. 05 -090
Albemarle County, Virginia October 14, 2008
The bulk of the development is slated to occur in areas dominated by the Nason soil
series. The Nason is generally characterized by the Soil Survey of Albemarle County as
deep and well drained. Development is also slated to occur in areas where the Tatum,
Manteo, and Lignum soil series are present. Generally, the Lignum and Tatum soils are
described as deep and well drained whereas the Manteo soils are described as shallow
and somewhat excessively drained.
It appears that primary lineations are somewhat limited in number across the site area.
However, the fracture trace analysis conducted for the site indicated the presence of
several prominent linear features which follow the tract of Briary Creek and its'
associated unnamed tributaries. The presence of these features indicates that a potential
does exist for the completion of suitable individual domestic supply wells at the site.
7.0 BEST MANAGEMENT PRACTICES
The Albemarle County Design Standards Manual offers the following advice for
coordinating groundwater and stormwater Best Management Practices:
If the site also requires a stormwater management/BMP plan in
accordance with the Water Protection Ordinance (WPO), then, to the
extent feasible, the groundwater BMPs and management plan can be
incorporated into the stormwater plan. This would be especially relevant
for the use of "non - structural measures" as outlined in Section 17 -313 of
the WPO. (DSM, page 2 -25).
In general, the BMP plan for the site may consist of the following measures, referenced
to the Albemarle County Design Standards Manual, Section 206.2.C.3 — Best
Management Practices for Groundwater.
• Site Design & House Construction — Locating houses and septic drainfields in a way
that does not interfere with or enhances groundwater recharge. Preserving trees and
forest cover to promote recharge. The property is currently forested. During
development of the property, tree cover will be preserved to the extent feasible. See
below under "Landscape & Land Cover" for more detail on the riparian protection
strategy.
In addition, other measures associated with road and lot drainage may be incorporated
to promote groundwater recharge. These may include stormwater measures that are
modified to promote recharge. For instance, the standard "Silt Trap Retrofit to
Biofilter" design (DSM, figure WR -9) can have a gravel "sump" below the
underdrain pipe to allow exfiltration back into the ground. Final decisions on the use
of these types of measures will be included with the final plan package.
• Landscape & Land Cover — Preserving and restoring trees and forest cover during and
after construction, especially in areas likely to be important for recharge. Please
Page 8 of 9
Tier III Groundwater Assessment True North Environmental
Jefferson Ridge Subdivision Project No. 05 -090
Albemarle Countv. Virginia October 14. 2008
reference the preliminary plat (Attachment A- Sheets 2 & 3) regarding required stream
buffers, set -backs from streams and additional mitigation measures.
• Education & Outreach — Distribute educational materials for homeowners on the
value and use of groundwater, pollution prevention, and water conservation. An
educational brochure could be distributed to each lot buyer. This task may be
coordinated with any County plans in the works to provide such materials for
building permit applicants.
The DSM suggests that easements may be provided for long -term monitoring wells
(DSM, page 2 -26) with guidance provided by the County monitoring plan. However, the
county does not seek an easement at this time.
8.0 CONCLUSIONS
True North Environmental, LLC concludes the following:
1. The project site is located in a groundwater availability zone where successfully
placed wells possess an average yield of nearly 7 gallons per minute (gpm) (Phase
II Albemarle County Hydrogeologic Assessment Report).
2. Based on the subdivision layout, it appears that the highest density of building
sites will take place within areas where the Nason soil series is dominant. The
Nason series is characterized as being deep and well drained. Other areas of
proposed development are underlain by the Tatum and Lignum series, which are
also characterized as being deep and well drained. Limited areas of proposed
development are underlain by the Manteo series, a shallow and somewhat
excessively drained soil.
3. Based on the fracture trace analysis conducted for the site, it appears that primary
lineations are relatively limited in number at the site. However, several prominent
lineations are present along Briery Creek and its' associated unnamed tributaries.
The well yield data utilized from the Phase II Albemarle County Hydrogeologic
Assessment Report indicates that wells completed within a relatively close
proximity to the site have typically provided a sufficient yield for domestic
consumption. The proposed lots are large enough, and topography sufficiently
gentle that it should be possible to locate multiple drilling sites on each lot, if the
first attempt at constructing a well is unsuccessful, or if a well fails sometime in
the future.
Page 1 of 1
FIGURES
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TRAILER
SITE
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(STOVE/
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SITE BOUNDARY
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Bdundaries
TSite
Boundary
Availability
Rating
Class 1: Lowest Relative Availability
Class 2: Medium Relative Availability
Class 3: Highest Relative Availability
12000 Feet
Base Map Source: USGS Albemarle County Topographic Map