Common use of Description of BMPs Clause in Contracts

Description of BMPs. The following is a description of several types of BMPs that could be implemented. The requirements of each BMP as described below are taken directly from the PA Stormwater BMP Manual (December, 2006). Refer to the PA BMP Manual (latest version) which can be found on the PA Department of Environmental Protection’s website. Rain Barrels/Cisterns Rain Barrels are large containers that collect drainage from roof leaders and temporarily store water to be released to lawns, gardens, and other landscaped areas after the rainfall has ended. Rain Barrels are typically between 50 to 200 gallons in size. The stored water can also be used as a non- potable water supply. Cisterns are larger than rain barrels having volumes of 200 gallons or more, and can be placed either on the surface or underground. Figures 1 and 2 show examples of rain barrels and cisterns, respectively, that could be used to manage stormwater from a project. Rain barrels and cisterns are manufactured in a variety of shapes and sizes. All of these facilities must make provisions for the following items: • There must be a means to release the water stored in the container between storm events in order for the necessary storage volume to be available for the next storm. • Stormwater must be kept from entering other potable systems, and pipes and storage units must be clearly marked “Do Not Drink”. • An overflow outlet should be placed a few inches below the top of the storage container with an overflow pipe to divert flow away from structures once the storage containers are filled. • Use screens to filter debris, and covers (lids) placed over the containers to prevent insects and debris from entering the storage chamber. • Make sure cisterns are watertight and do not leak. • Rain barrels are typically assumed to be 25% full to calculate volume since they are not always emptied before each storm. The tables contained in this Handbook were developed to account for the 25% increase in the required storage of a rain barrel or a cistern. Source (picture on left): xxxx://xxx.xxxxxx.xxx/Eng/Stormwater/YourProperty/YourProperty.htm Source (picture on right): :xxxx://xxx.xxxxxxxxx.xxx/tracks/transplantedgardener/Rainbarrels.cfm Figure 1: Rain Barrels Source (for both pictures): Pennsylvania Stormwater BMP Manual (PADEP, 2006) Figure 2: Cisterns Infiltration Trench An infiltration trench is a long, narrow, rock-filled trench, with or without a perforated pipe placed within the rock to distribute water evenly along the trench, that receives stormwater runoff, and has no outlet. Runoff is stored in the void space between the stones and in the pipe, and infiltrates through the bottom of the trench into the underlying soil matrix. Figure 3 shows a typical cross- section of an infiltration trench configuration. Infiltration trenches shall incorporate or make provisions for the following elements: • These facilities should be located a minimum of ten (10) feet (or as otherwise required by the Municipality) from the building foundation to avoid foundation seepage problems, and are not recommended if their installation would create a risk of flooding other structures constructed at or below grade. • Perforated pipe placed within the rock is to be set level. • The width is limited to between 3 to 8 feet, and the depth ranges from 2 to 5 feet. • Trench should be wrapped in nonwoven geotextile (top, sides, and bottom). • There should be a positive overflow that allows stormwater that cannot be stored or infiltrated to be discharged into a nearby vegetated area. • Roof downspouts may be connected to infiltration trenches, but should contain a cleanout to collect sediment and debris before entering the infiltration area. • Infiltration testing is recommended to ensure soil is capable of infiltrating stormwater. • It is recommended that there be a 2 foot clearance above the regularly occurring seasonal high water table, and have a minimum depth to bedrock of 2 feet. • The infiltration trench should be at least 50 feet from individual water supply xxxxx, 100 feet from community or municipal water supply xxxxx, and 50 feet from any septic system component. It should not be located near stormwater Hotspots (refer to B.2 Definitions). • The infiltration trench should be located so that it presents no threat to sub-surface structures such as building foundations and basements. • Protect infiltration areas from compaction by heavy equipment during and after construction. • Infiltration trenches should be constructed after all earth disturbance associated with a given project or site is stabilized to avoid clogging. • The ratio of the drainage area which stormwater runoff is collected from to the area of the footprint (bottom area) of the infiltration portion of the facility should be as small as possible with a ratio of less than 5:1 preferred. Source: Pennsylvania Stormwater BMP Manual (PADEP, 2006) Figure 3: Cross-Section of Typical Infiltration Trench Rain Garden/Bioretention Area A Rain Garden (Bioretention Area) is an excavated depression area on the surface of the land in which native vegetation is planted to filter and use stormwater runoff. Runoff ponds on top of the surface of the rain garden and then infiltrates into an enhanced soil/planting mix below the surface where plants can use the water to grow. Bioretention improves water quality, with the vegetation planted in the facility filtering the water, and the root systems encouraging or promoting infiltration. Figure 4 shows a cross-section of a typical rain garden. Key elements of a rain garden include: • Recommended ponding depths not exceeding 1 foot. • Native vegetation that can tolerate dry and wet weather. • An overflow area where, if the bioretention area were to overflow, the overflow would flow over pervious surfaces (i.e. grass, meadow), and would not cause harm to property, or; • An overflow, such as a domed riser, to allow excess flow from large storms to travel to other infiltration areas, pervious areas, or connected storm systems designed to receive the excess runoff. • For most areas, slopes should be limited to 3:1, maximum; however, where space is limited, 2:1 side slopes may be acceptable with approval from the municipal engineer. • The soil/planting mix depth should not be less than 1.5 feet deep and typically consist of a mixture of topsoil, sand and compost (i.e. mulch). The topsoil, sand and compost should be uniformly mixed by volume in a 50%, 30%, 20% mixture, respectively. Source: Pennsylvania Stormwater BMP Manual (PADEP, 2006) Figure 4: Cross-Section of Typical Rain Garden/Bioretention Area Dry Xxxxx

Description of BMPs. The following is a description of several types of BMPs that could be implemented. The requirements of each BMP as described below are taken directly from the PA Stormwater BMP Manual (December, 2006). Refer to the PA BMP Manual (latest version) which can be found on the PA Department of Environmental Protection’s website. Rain Barrels/Cisterns Rain Barrels are large containers that collect drainage from roof leaders and temporarily store water to be released to lawns, gardens, and other landscaped areas after the rainfall has ended. Rain Barrels are typically between 50 to 200 gallons in size. The stored water can also be used as a non- potable nonpotable water supply. Cisterns are larger than rain barrels having volumes of 200 gallons or more, and can be placed either on the surface or underground. Figures 1 and 2 show examples of rain barrels and cisterns, respectively, respectively that could be used to manage stormwater from a project. Rain barrels and cisterns are manufactured in a variety of shapes and sizes. All of these facilities must make provisions for the following items: • 🗣 There must be a means to release the water stored in the container between storm events in order for the necessary storage volume to be available for the next storm. • 🗣 Stormwater must be kept from entering other potable systems, and pipes and storage units must be clearly marked “Do Not Drink”. • 🗣 An overflow outlet should be placed a few inches below the top of the storage container with an overflow pipe to divert flow away from structures once the storage containers are filled. • 🗣 Use screens to filter debris, and covers (lids) placed over the containers to prevent insects and debris from entering the storage chamber. • 🗣 Make sure cisterns are watertight and do not leak. • 🗣 Rain barrels are typically assumed to be 25% full to calculate volume since they are not always emptied before each storm. The tables contained in this Handbook were developed to account for the 25% increase in the required storage of a rain barrel or a cistern. STORMWATER MANAGEMENT Source (picture on left): xxxx://xxx.xxxxxx.xxx/Eng/Stormwater/YourProperty/YourProperty.htm xxxx://xxx.xxxxxx.xxx/Eng/Stormwater/YourProperty/YourProperty.him Source (picture on right): :xxxx://xxx.xxxxxxxxx.xxx/tracks/transplantedgardener/Rainbarrels.cfm Figure 1: Rain Barrels Source (for both pictures): Pennsylvania Stormwater BMP Manual (PADEP, 2006) Figure 2: Cisterns Infiltration Trench An infiltration trench is a long, narrow, rock-filled trench, with or without a perforated pipe placed within the rock to distribute water evenly along the trench, trench that receives stormwater runoff, and has no outlet. Runoff is stored in the void space between the stones and in the pipe, and infiltrates through the bottom of the trench into the underlying soil matrix. Figure 3 shows a typical cross- cross section of an infiltration trench configuration. Infiltration trenches shall incorporate or make provisions for the following elements: • 🗣 These facilities should be located a minimum of ten (10) 10 feet (or as otherwise required by the Municipality) from the building foundation to avoid foundation seepage problems, and are not recommended if their installation would create a risk of flooding other structures constructed at or below grade. • 🗣 Perforated pipe placed within the rock is to be set level. • 🗣 The width is limited to between 3 three to 8 eight feet, and the depth ranges from 2 two to 5 five feet. • 🗣 Trench should be wrapped in nonwoven geotextile (top, sides, and bottom). • 🗣 There should be a positive overflow that allows stormwater that cannot be stored or infiltrated to be discharged into a nearby vegetated area. • 🗣 Roof downspouts may be connected to infiltration trenches, but should contain a cleanout to collect sediment and debris before entering the infiltration area. • 🗣 Infiltration testing is recommended to ensure soil is capable of infiltrating stormwater. • 🗣 It is recommended that there be a 2 two-foot clearance above the regularly occurring seasonal high high-water table, and have a minimum depth to bedrock of 2 two feet. • 🗣 The infiltration trench should be at least 50 feet from individual water supply xxxxx, 100 feet from community or municipal water supply xxxxx, and 50 feet from any septic system component. It should not be located near stormwater Hotspots (refer to B.2 Definitions). • 🗣 The infiltration trench should be located so that it presents no threat to sub-surface structures such as building foundations and basements. • 🗣 Protect infiltration areas from compaction by heavy equipment during and after construction. • 🗣 Infiltration trenches should be constructed after all earth disturbance associated with a given project or site is stabilized to avoid clogging. • 🗣 The ratio of the drainage area which stormwater runoff is collected from to the area of the footprint (bottom area) of the infiltration portion of the facility should be as small as possible with a ratio of less than 5:1 preferred. STORMWATER MANAGEMENT Source: Pennsylvania Stormwater BMP Manual (PADEP, 2006) Figure 3: Cross-Cross Section of Typical Infiltration Trench Rain Garden/Bioretention Area A Rain Garden (Bioretention Area) is an excavated depression area on the surface of the land in which native vegetation is planted to filter and use stormwater runoff. Runoff ponds on top of the surface of the rain garden and then infiltrates into an enhanced soil/planting mix below the surface where plants can use the water to grow. Bioretention improves water quality, with the vegetation planted in the facility filtering the water, and the root systems encouraging or promoting infiltration. Figure 4 shows a cross-cross section of a typical rain garden. Key elements of a rain garden include: • 🗣 Recommended ponding depths not exceeding 1 one foot. • 🗣 Native vegetation that can tolerate dry and wet weather. • 🗣 An overflow area where, if the bioretention area were to overflow, the overflow would flow over pervious surfaces (i.e. i.e., grass, meadow), and would not cause harm to property, or; • 🗣 An overflow, such as a domed riser, to allow excess flow from large storms to travel to other infiltration areas, pervious areas, or connected storm systems designed to receive the excess runoff. • 🗣 For most areas, slopes should be limited to 3:1, maximum; however, where space is limited, 2:1 side slopes may be acceptable with approval from the municipal engineer. • 🗣 The soil/planting mix depth should not be less than 1.5 feet deep and typically consist of a mixture of topsoil, sand and compost (i.e. i.e., mulch). The topsoil, sand and compost should be uniformly mixed by volume in a 50%, 30%, 20% mixture, respectively. Source: Pennsylvania Stormwater BMP Manual (PADEP, 2006) Figure 4: Cross-Cross Section of Typical Rain Garden/Bioretention Area Dry Xxxxx

Description of BMPs. The following is a description of several types of BMPs that could be implemented. The requirements of each BMP as described below are taken directly from the PA Stormwater BMP Manual (December, 2006). Refer to the PA BMP Manual (latest version) which can be found on the PA Department of Environmental Protection’s website. Rain Barrels/Cisterns Rain Barrels are large containers that collect drainage from roof leaders and temporarily store water to be released to lawns, gardens, and other landscaped areas after the rainfall has ended. Rain Barrels are typically between 50 to 200 gallons in size. The stored water can also be used as a non- potable water supply. Cisterns are larger than rain barrels having volumes of 200 gallons or more, and can be placed either on the surface or underground. Figures 1 and 2 show examples of rain barrels and cisterns, respectively, that could be used to manage stormwater from a project. Rain barrels and cisterns are manufactured in a variety of shapes and sizes. All of these facilities must make provisions for the following items: •  There must be a means to release the water stored in the container between storm events in order for the necessary storage volume to be available for the next storm. •  Stormwater must be kept from entering other potable systems, and pipes and storage units must be clearly marked “Do Not Drink”. •  An overflow outlet should be placed a few inches below the top of the storage container with an overflow pipe to divert flow away from structures once the storage containers are filled. •  Use screens to filter debris, and covers (lids) placed over the containers to prevent insects and debris from entering the storage chamber. •  Make sure cisterns are watertight and do not leak. •  Rain barrels are typically assumed to be 25% full to calculate volume since they are not always emptied before each storm. The tables contained in this Handbook were developed to account for the 25% increase in the required storage of a rain barrel or a cistern. Source (picture on left): xxxx://xxx.xxxxxx.xxx/Eng/Stormwater/YourProperty/YourProperty.htm Source (picture on right): :xxxx://xxx.xxxxxxxxx.xxx/tracks/transplantedgardener/Rainbarrels.cfm Figure 1: Rain Barrels Source (for both pictures): Pennsylvania Stormwater BMP Manual (PADEP, 2006) Figure 2: Cisterns Infiltration Trench An infiltration trench is a long, narrow, rock-filled trench, with or without a perforated pipe placed within the rock to distribute water evenly along the trench, that receives stormwater runoff, and has no outlet. Runoff is stored in the void space between the stones and in the pipe, and infiltrates through the bottom of the trench into the underlying soil matrix. Figure 3 shows a typical cross- section of an infiltration trench configuration. Infiltration trenches shall incorporate or make provisions for the following elements: •  These facilities should be located a minimum of ten (10) feet (or as otherwise required by the Municipality) from the building foundation to avoid foundation seepage problems, and are not recommended if their installation would create a risk of flooding other structures constructed at or below grade. •  Perforated pipe placed within the rock is to be set level. •  The width is limited to between 3 to 8 feet, and the depth ranges from 2 to 5 feet. •  Trench should be wrapped in nonwoven geotextile (top, sides, and bottom). •  There should be a positive overflow that allows stormwater that cannot be stored or infiltrated to be discharged into a nearby vegetated area. •  Roof downspouts may be connected to infiltration trenches, but should contain a cleanout to collect sediment and debris before entering the infiltration area. •  Infiltration testing is recommended to ensure soil is capable of infiltrating stormwater. •  It is recommended that there be a 2 foot clearance above the regularly occurring seasonal high water table, and have a minimum depth to bedrock of 2 feet. •  The infiltration trench should be at least 50 feet from individual water supply xxxxx, 100 feet from community or municipal water supply xxxxx, and 50 feet from any septic system component. It should not be located near stormwater Hotspots (refer to B.2 Definitions). •  The infiltration trench should be located so that it presents no threat to sub-surface structures such as building foundations and basements. •  Protect infiltration areas from compaction by heavy equipment during and after construction. •  Infiltration trenches should be constructed after all earth disturbance associated with a given project or site is stabilized to avoid clogging. •  The ratio of the drainage area which stormwater runoff is collected from to the area of the footprint (bottom area) of the infiltration portion of the facility should be as small as possible with a ratio of less than 5:1 preferred. Source: Pennsylvania Stormwater BMP Manual (PADEP, 2006) Figure 3: Cross-Section of Typical Infiltration Trench Rain Garden/Bioretention Area A Rain Garden (Bioretention Area) is an excavated depression area on the surface of the land in which native vegetation is planted to filter and use stormwater runoff. Runoff ponds on top of the surface of the rain garden and then infiltrates into an enhanced soil/planting mix below the surface where plants can use the water to grow. Bioretention improves water quality, with the vegetation planted in the facility filtering the water, and the root systems encouraging or promoting infiltration. Figure 4 shows a cross-section of a typical rain garden. Key elements of a rain garden include: •  Recommended ponding depths not exceeding 1 foot. •  Native vegetation that can tolerate dry and wet weather. •  An overflow area where, if the bioretention area were to overflow, the overflow would flow over pervious surfaces (i.e. grass, meadow), and would not cause harm to property, or; •  An overflow, such as a domed riser, to allow excess flow from large storms to travel to other infiltration areas, pervious areas, or connected storm systems designed to receive the excess runoff. •  For most areas, slopes should be limited to 3:1, maximum; however, where space is limited, 2:1 side slopes may be acceptable with approval from the municipal engineer. •  The soil/planting mix depth should not be less than 1.5 feet deep and typically consist of a mixture of topsoil, sand and compost (i.e. mulch). The topsoil, sand and compost should be uniformly mixed by volume in a 50%, 30%, 20% mixture, respectively. Source: Pennsylvania Stormwater BMP Manual (PADEP, 2006) Figure 4: Cross-Section of Typical Rain Garden/Bioretention Area Dry Xxxxx

Description of BMPs. The following is a description of several types of BMPs that could be implemented. The requirements of each BMP as described below are taken directly from the PA Stormwater BMP Manual (December, 2006). Refer to the PA BMP Manual (latest version) which can be found on the PA Department of Environmental Protection’s website. Rain Barrels/Cisterns Rain Barrels are large containers that collect drainage from roof leaders and temporarily store water to be released to lawns, gardens, and other landscaped areas after the rainfall has ended. Rain Barrels are typically between 50 to 200 gallons in size. The stored water can also be used as a non- potable water supply. Cisterns are larger than rain barrels having volumes of 200 gallons or more, and can be placed either on the surface or underground. Figures 1 and 2 show examples of rain barrels and cisterns, respectively, that could be used to manage stormwater from a project. Rain barrels and cisterns are manufactured in a variety of shapes and sizes. All of these facilities must make provisions for the following items: • There must be a means to release the water stored in the container between storm events in order for the necessary storage volume to be available for the next storm. • Stormwater must be kept from entering other potable systems, and pipes and storage units must be clearly marked “Do Not Drink”. • An overflow outlet should be placed a few inches below the top of the storage container with an overflow pipe to divert flow away from structures once the storage containers are filled. • Use screens to filter debris, and covers (lids) placed over the containers to prevent insects and debris from entering the storage chamber. • Make sure cisterns are watertight and do not leak. • Rain barrels are typically assumed to be 25% full to calculate volume since they are not always emptied before each storm. The tables contained in this Handbook were developed to account for the 25% increase in the required storage of a rain barrel or a cistern. Source (picture on left): xxxx://xxx.xxxxxx.xxx/Eng/Stormwater/YourProperty/YourProperty.htm Source (picture on right): :xxxx://xxx.xxxxxxxxx.xxx/tracks/transplantedgardener/Rainbarrels.cfm Figure 1: Rain Barrels Source (for both pictures): Pennsylvania Stormwater BMP Manual (PADEP, 2006) Figure 2: Cisterns Infiltration Trench An infiltration trench is a long, narrow, rock-filled trench, with or without a perforated pipe placed within the rock to distribute water evenly along the trench, that receives stormwater runoff, and has no outlet. Runoff is stored in the void space between the stones and in the pipe, and infiltrates through the bottom of the trench into the underlying soil matrix. Figure 3 shows a typical cross- section of an infiltration trench configuration. Infiltration trenches shall incorporate or make provisions for the following elements: • These facilities should be located a minimum of ten (10) feet (or as otherwise required by the MunicipalityTownship) from the building foundation to avoid foundation seepage problems, and are not recommended if their installation would create a risk of flooding other structures constructed at or below grade. • Perforated pipe placed within the rock is to be set level. • The width is limited to between 3 to 8 feet, and the depth ranges from 2 to 5 feet. • Trench should be wrapped in nonwoven geotextile (top, sides, and bottom). • There should be a positive overflow that allows stormwater that cannot be stored or infiltrated to be discharged into a nearby vegetated area. • Roof downspouts may be connected to infiltration trenches, but should contain a cleanout to collect sediment and debris before entering the infiltration area. • Infiltration testing is recommended to ensure soil is capable of infiltrating stormwater. • It is recommended that there be a 2 foot clearance above the regularly occurring seasonal high water table, and have a minimum depth to bedrock of 2 feet. • The infiltration trench should be at least 50 feet from individual water supply xxxxx, 100 feet from community or municipal water supply xxxxx, and 50 feet from any septic system component. It should not be located near stormwater Hotspots (refer to B.2 Definitions). • The infiltration trench should be located so that it presents no threat to sub-surface structures such as building foundations and basements. • Protect infiltration areas from compaction by heavy equipment during and after construction. • Infiltration trenches should be constructed after all earth disturbance associated with a given project or site is stabilized to avoid clogging. • The ratio of the drainage area which stormwater runoff is collected from to the area of the footprint (bottom area) of the infiltration portion of the facility should be as small as possible with a ratio of less than 5:1 preferred. Source: Pennsylvania Stormwater BMP Manual (PADEP, 2006) Figure 3: Cross-Section of Typical Infiltration Trench Rain Garden/Bioretention Area A Rain Garden (Bioretention Area) is an excavated depression area on the surface of the land in which native vegetation is planted to filter and use stormwater runoff. Runoff ponds on top of the surface of the rain garden and then infiltrates into an enhanced soil/planting mix below the surface where plants can use the water to grow. Bioretention improves water quality, with the vegetation planted in the facility filtering the water, and the root systems encouraging or promoting infiltration. Figure 4 shows a cross-section of a typical rain garden. Key elements of a rain garden include: • Recommended ponding depths not exceeding 1 foot. • Native vegetation that can tolerate dry and wet weather. • An overflow area where, if the bioretention area were to overflow, the overflow would flow over pervious surfaces (i.e. grass, meadow), and would not cause harm to property, or; • An overflow, such as a domed riser, to allow excess flow from large storms to travel to other infiltration areas, pervious areas, or connected storm systems designed to receive the excess runoff. • For most areas, slopes should be limited to 3:1, maximum; however, where space is limited, 2:1 side slopes may be acceptable with approval from the municipal engineerTownship Engineer. • The soil/planting mix depth should not be less than 1.5 feet deep and typically consist of a mixture of topsoil, sand and compost (i.e. mulch). The topsoil, sand and compost should be uniformly mixed by volume in a 50%, 30%, 20% mixture, respectively. Source: Pennsylvania Stormwater BMP Manual (PADEP, 2006) Figure 4: Cross-Section of Typical Rain Garden/Bioretention Area Dry Xxxxx