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Chapter 2 Stormwater Management Appendix - Fauquier County

Chapter 2 Stormwater Management Appendix - Fauquier County

Design Standards Manual

Design Standards Manual 1 st Edition 3) diagram of well construction components, materials, sizes, dimensions and installation depths, 4) proposed criteria for evaluating the results of the observations, 5) provisions that allow County staff to enter the monitoring site for the purpose of making independent observations throughout the study period, including written permission from the property owner, 6) general location of the study site on aerial photograph with property lines, topographic contours and property lines (available from the Fauquier County GIS Department), 7) provide property identification number of parcel where study site is located, 8) soil map and information from the Fauquier County Soil Survey. If a preliminary or Type 1 Soil Report is available, it shall be provided as it is the best available soil information. B. Location and number of monitoring wells 1) Well locations shall represent the portion of the proposed area(s) most likely to exhibit the wettest soil conditions. The wettest locations shall be based on landforms and soil morphologic features. 2) A minimum of three monitoring wells shall be located in the proposed location of the stormwater management facility. 3) For large facilities, County may require additional monitoring wells. The number of additional wells needed will be determined during the review of the study plan. C. Depth of monitoring well The bottom of the well shall be placed a minimum of eighteen inches below the bottom or installation depth of the stormwater management facility. If a perched water table (episaturation) is present in the proposed study site, depth of the wells shall be designed according to the soil morphology. The depth(s) of the wells shall be proposed in the study plan and must be approved by the County. D. Construction standards for manual monitoring wells 1) Construct a bore hole with a soil auger, taking care to limit smearing and compaction of the sidewalls and bottom of the hole. Revisions Adopted: July 12, 2012 Design Standards Manual Chapter 2: Drainage D-56

Design Standards Manual 1 st Edition 2) Construct the bore hole when the soil is slightly moist or dry 3) The bore hole shall be of sufficient diameter to allow an annular space of one to three inches to remain between the pipe and borehole sidewall. 4) Case the bore hole with schedule 40 PVC pipe with an inside diameter of 1.5 to 3 inches. a) The lower 12 inches of the pipe shall have 1/8 inch to 1/4 slits or 1/8 to 1/4 inch diameter holes drill in it. b) The pipe should be covered with a threaded cap that can be tightened to minimize vandalism. 5) Backfill the annular space around the pipe with clean pea gravel to a depth of one to two inches above the uppermost slit or drilled hole. 6) Fill the annular space to within two to four inches of the surface with bentonite or neat cement. 7) Backfill to the surface with fine textures soil, making a collar at the surface to minimize water entering the well (the cased bore hole). 8) If the wells are to be read manually, establish a reference point that allows the measurements to be made to the surface of the water with an accuracy of ½ inch. E. Construction Standards for Automated wells. If the wells are equipped with automated data recorders, follow the manufacturer’s installation instructions. Periodic inspection of automated wells is highly recommended to ensure that data is being recorded. Incomplete data may, at the discretion of the County, invalidate the test. F. The yearly observation period for water table studies shall be December 1 through May 31, inclusive. G. The normal rainfall determination period shall be January 1 to October 31 immediately prior to the beginning of the study. H. Frequency of observations: 1) Automated wells shall be configured to collect data a minimum of two times in every 24 hour period. 2) Manual wells: Revisions Adopted: July 12, 2012 Design Standards Manual Chapter 2: Drainage D-57

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