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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 I. Length of study a) Observations shall be made a minimum of two times in any 7 day period. b) No more than three consecutive days without a recorded observation is permitted. c) In soils suspected of having a rapidly fluctuating water table, consideration should be given to increasing the frequency of observation. d) The frequency of observation may be modified upon mutual agreement between the County and the applicant, if circumstances warrant more or less frequent observations 1) The length of the study shall encompass a minimum of one yearly observation period, with cumulative precipitation that is 80 percent or greater of the 30 year average during the normal rainfall determination period. 2) The length of study shall encompass a minimum of two yearly observation periods if cumulative precipitation is less than 80 percent of the 30 year average during the normal rainfall determination period. Length of Study Normal rainfall determination period 1 yearly observation period greater than or equal to 80% of the 30 year average 2 yearly observation periods less than 80% of the 30 year average 3) The study may be ended at the request of the applicant at any time. Premature test termination renders all test data invalid. 4) The cumulative precipitation during the observation period shall be between 80 and 120 percent of the 30 year average for the observation period to be considered valid. 5) The applicant shall have the option of accepting the results of the observation period when the cumulative precipitation is greater than 120 percent of the 30 year average for the period. 6) Observation period precipitation information shall be referenced from the closest NOAA approved weather station that appears to reflect the general climatic conditions as those at the study site. Alternative sources of study period precipitation data may be approved by the County on a case-by-case basis. J. Recording of observations in manual wells Revisions Adopted: July 12, 2012 Design Standards Manual Chapter 2: Drainage D-58

Design Standards Manual 1 st Edition 1) Record the depth to the water from the reference point to the nearest ½ inch. 2) Water level measurements shall be converted to indicate the depth below ground surface that water was observed. K. Criteria for determination of the seasonal water table The seasonal water table shall be the shallowest of: a) The shallowest depth at which water is observed for 30 cumulative days. b) The shallowest depth water is observed for 20 consecutive days. L. Site modifications that may impact the water table study are prohibited during the study period. The prohibited activities include construction of a soil drainage system, cutting or filling of soil, timber harvesting or any other activity deemed by the County to potential impact the validity of the study. Site modifications performed after the beginning of the study shall invalidate all observations made prior to the site modifications. M. Reporting and notification 1) Copies of the water table observation data and precipitation data shall be submitted to the County within 14 days of the end of each observation month. 2) A report shall be submitted to the County within 30 days of each observation period that includes: a) Discernable relationships between the observation data and the precipitation data. b) The seasonal water table depth based on cumulative days. c) The seasonal high water table depth based on consecutive days. d) The percent of normal precipitation that occurred during the annual observation period. 3) A final report shall be submitted to the County within 60 days of completion of the report. The report shall include: a) all water table data, precipitation data and appropriate data summaries, Revisions Adopted: July 12, 2012 Design Standards Manual Chapter 2: Drainage D-59

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