ORANGE COUNTY, VIRGINIA

CODE OF ORDINANCES

 
112 W. Main Street
Orange, Virginia 22960

 Sec. 54-211. - Authority and purpose.

To safeguard the public health and welfare, the county must protect the groundwater and ensure that new development will not unreasonably reduce the water supply of existing development. Hydrogeologic testing consistent with this standard is required to implement section 54-202, and to provide the county with the necessary information on which to base sound judgments in the review of applications for subdivision approval.

(Ord. of 3-9-2010)


Sec. 54-212. - Applicability.

For any new major subdivision to be served by groundwater in accordance with section 54-202, the subdivider shall perform tests and furnish a report as required in this article. The tests shall be conducted and a report of the tests shall be prepared by a state-certified professional geologist (PG) or a state-licensed professional engineer (PE). Application for preliminary plat approval may be filed only after such report has been approved by the county.

(Ord. of 3-9-2010)


Sec. 54-213. - Geologic map required.

The subdivider shall provide a geologic map of the area to be subdivided. This map shall conform to the countywide geologic maps routinely prepared by the state division of mineral resources, state department of mines, minerals and energy in form, content and quality.

(Ord. of 3-9-2010)


Sec. 54-214. - Aquifer tests based on geologic map.

At least one aquifer test shall be performed in each geologic unit. If a geologic unit is larger than 50 acres, one aquifer test shall be performed in each 50 acres, or fraction thereof, of the unit. In unusual conditions the county may require more tests, as the geology requires.

(Ord. of 3-9-2010)


Sec. 54-215. - Proposal required.

After mapping the geology and before testing the aquifer, the subdivider shall submit a proposal identifying the location of all test wells and observation wells, and describing the tests to be performed on each. The proposal shall include a map at one inch equals 200 feet scale, showing all watershed units and boundaries, planimetric features, topography, geologic contracts and structural features, groundwater table contours and direction of groundwater flow as available from published sources, existing springs, wells and septic systems on the property, and buildings and wells within 1,000 feet of the subject property. The subdivider shall meet with the county's representatives to review and approve the proposal.

(Ord. of 3-9-2010)


Sec. 54-216. - Testing the aquifer for adequate quantity.

A standard continuous constant-rate test of at least 72 hours' duration shall be performed on each test well using professionally accepted methods (as described in the most recent edition of Groundwater and Wells by Fletcher Driscoll, Johnson Division, St. Paul, MN). The geologist or engineer shall submit well logs (VWCB form GW2) for all test wells. Test wells shall be constructed and abandoned in compliance with VDH regulations.

(Ord. of 3-9-2010)


Sec. 54-217. - Observation wells.

Two observation wells shall be drilled near each test well and shall be monitored continuously during each test. One observation well shall be approximately 100 feet from the test well. The other shall be approximately 300 feet from the test well and aligned with the test well and the first observation well. Observation wells need not be constructed to water well standards but must be abandoned in compliance with VDH regulations.

(Ord. of 3-9-2010)

 

Sec. 54-218. - Depth to water.

Aquifer tests shall be performed with submersible pumps. Depth-to-water measurements shall be accurate to the nearest tenth of a foot. Discharge rates of the test wells shall be measured, not estimated, and the measurements recorded in the field at the time of the test.

(Ord. of 3-9-2010)

 

Sec. 54-219. - Recovery period.

Each aquifer pump test shall include a recovery period of 24 hours, or to a residual drawdown equal to 20 percent of the maximum drawdown, whichever is less.

(Ord. of 3-9-2010)


Sec. 54-220. - Quantity standard.

Such tests shall show that the aquifer is capable of producing two gallons of water per minute multiplied by the number of dwelling units to be constructed over the life of the development, without undue change in the piezometric surface of the aquifer or the yield of existing wells in the area.

(1) Where individual wells are proposed, the tests shall show that each geologic unit is capable of producing two gallons of water per minute multiplied by the number of dwelling units to be constructed in that geologic unit.

(2) Where community well systems are proposed, the tests shall show that the geologic units in which the production wells will be located are capable of producing two gallons of water per minute multiplied by the number of dwelling units to be constructed in the development.

(Ord. of 3-9-2010)


Sec. 54-221. - Testing for adequate quality.

One representative sample shall be drawn from each test well near the end of the yield test. It shall be tested by a laboratory certified by the commonwealth for bacteria, primary and secondary contaminants as established in 12VAC5-590-380, 390 and 1280:15 of VDH waterworks regulations. For any proposal in any area of the county west of Routes 231 and 646, where well water is likely to contain radioactivity, one representative sample shall be drawn from each test well near the end of the yield test and tested for radioactivity as established in 12VAC5-590-400 of VDH waterworks regulations.

(Ord. of 3-9-2010)


Sec. 54-222. - Primary contaminants.

If the tests show that bacteria or one or more primary contaminants are present at a level exceeding the maximum acceptable level, the subdivider shall either retest the well, drill and test another well, or submit a proposal to treat the water to remove or reduce the contaminant to acceptable levels.

(Ord. of 3-9-2010)


Sec. 54-223. - Secondary contaminants.

If the tests show that one or more secondary contaminants are present at a level exceeding the maximum acceptable level, the subdivider shall show on the plat that the well water was tested and determined to be contaminated, but is not necessarily unsafe.

(Ord. of 3-9-2010)


Sec. 54-224. - Radioactivity.

If the test results show that radioactivity is present at a level exceeding the maximum acceptable level, the subdivider shall either retest the well, drill and test another well, or submit a proposal to treat the water to reduce the radioactivity to acceptable levels.

(Ord. of 3-9-2010)


Sec. 54-225. - Report of results.

The applicant shall submit a report containing a graphic lithology of each well and a narrative discussing the geologic setting, watershed units, hydrogeologic units, relief, occurrence and movement of groundwater, water quality and interpretation of water data from the surrounding area.

(Ord. of 3-9-2010)


Sec. 54-226. - General map.

The report shall include a legible map at least 1:6000 (1? = 500?) scale showing the boundaries of the proposed subdivision, adjacent owners, existing land use, existing wells or other sources of drinking water, and any known or suspected source of groundwater pollution (including but not limited to landfills, hazardous waste facilities, junkyards, or federal or state "superfund" sites).

(Ord. of 3-9-2010)


Sec. 54-227. - Specific map.

The report shall include a legible map at least 1:2400 (1?= 200?) scale showing all existing planimetric features, topography, surface water, state planar grid system, estimated groundwater contours and direction of flow, and all proposed roads, lot lines, building sites and septic systems.

(Ord. of 3-9-2010)


Sec. 54-228. - Cross sections.

The report shall include at least two generally orthagonal cross sections showing geologic formations, drill log data, well locations, elevations of rock, elevations of static water surfaces, and stabilized drawdown levels of the water surface. The location of each cross section shall be shown on the plan view map.

(Ord. of 3-9-2010)


Sec. 54-229. - Raw data.

The report shall show all raw data necessary to support its calculations and conclusions. It shall develop groundwater mass balance and recharge estimates, and shall discuss the following:

(1) Identification of the form and source of recharge;

(2) Calculated projected effects on the piezometric surface of all wells pumping at 300 gallons per day per lot;

(3) Average recharge for each geologic unit in the subdivision, the recharge in drought years, and the average outflow from each geologic unit in the subdivision;

(4) Net water consumption of the subdivision;

(5) For individual wells, proposals to address wells of inadequate yield;

(6) Transmissivity, storativity, hydraulic gradient, hydraulic conductivity, and groundwater flow of the various materials evaluated by aquifer tests, interpreted using professionally accepted methods;

(7) Specific capacity of each well;

(8) Observed boundary effects and effective radius of influence of each well;

(9) State planar grid coordinates for each well;

(10) Results of the laboratory testing of water quality; and

(11) Potential sources of groundwater contamination, and recommendations for ameliorating their impact.

(Ord. of 3-9-2010)


Sec. 54-230. - Application fee.

The application fee for subdivision proposals requiring such tests shall include an amount, as adopted by the board of supervisors, to defray the cost to the county of retaining a consultant to review the proposal and report and assist the county at the public hearing.

(Ord. of 3-9-2010)