WDNR Technical The Wisconsin DNR Technical Standard Step C: Evaluation of Specific Infiltration Areas 1002 – Site Evaluation for Stormwater Standard 1002 Site Infiltration consists of four basic steps: If the field verification indicates potentially Evaluation for suitable areas for infiltration devices, a Stormwater Infiltration minimum number of borings or test pits is Step A: Initial Screening required for each type of infiltration device to be designed as indicated in Table 1 of the The initial screening identifies potential Standard. The soils information obtained from locations for infiltration devices. The purpose the borings or test pits determines if the of the initial screening is to screen for proposed locations are suitable for infiltration exclusions and exemptions under Chapter NR and provides the necessary information to 151 of the Wisconsin Administrative Code and design the device(s). to determine where field work is needed for Step B. For the design of infiltration devices, one of two methods can be used to determine a design infiltration rate. One option includes measuring Step B: Field Verification of the Initial the actual infiltration rate of the soil in the field. Screening This is most easily done if test pits are conducted. This option provides a more Field verification is required for areas of the accurate infiltration rate; however, the test can development site considered potentially suitable be very time consuming. The other option is to Since October 1, 2004, the stormwater for infiltration based on the initial screening. select a design infiltration rate from Table 2 of infiltration requirements established by the This process consists of soil borings or test pits the Standard based on the least permeable soil Wisconsin DNR have become one more item performed to verify soil infiltration capacity horizon within five feet below the bottom of the added to the already long list of things necessary characteristics and to determine the depth to selected infiltration device. This option is to complete a construction project. Complying groundwater and bedrock. This process can also quick, but often results in a larger infiltration with the infiltration standard doesn't have to be include laboratory testing to determine percent device as the values in Table 2 are somewhat a difficult and time consuming process. This is fines information and soil classification to verify conservative. because an infiltration pre-screening and field any exemption and exclusion found in the initial verification can be easily worked into a Phase I screening. environmental site assessment and/or Step D: Soil and Site Evaluation Report geotechnical exploration program. The site's legal description and all information required in Steps B and C are required to be included in the Soil and Site Evaluation Report. Neenah, WI 54956 1060 Breezewood Lane, Suite 102 River Valley Testing Corp. RIVER VALLEY TESTING CORP. RIVER VALLEY TESTING CORP. RVT wants to help you with Geotechnical Engineering your project! Construction Materials Testing Environmental Consulting RVT's stormwater infiltration Drilling Services services include: Laboratory Testing Services Initial Site Screenings Soil Borings or Test Pit Observations for Site NEENAH Verification Telephone: (920) 886-1406 Fax: (920) 886-1409 Soil Borings or Test Pit Observations For Specific Infiltration Areas GREEN BAY Telephone: (920) 347-9040 Laboratory Testing to Provide the Necessary Fax: (920) 347-9044 Design Criteria Consultation and Material Testing for the MADISON Construction of Specific Infiltration Devices Telephone: (608) 222-9406 Fax: (608) 222-9408 WWW.RVTCORP.COM If you have a question, or if you're interested in scheduling a free presentation for your company, call Alex Barker or Matthew Meyer at 920-886-1406.
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