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HomeMy WebLinkAboutStormwaterSTORMWATER MANAGEMENT CHECKLIST Blue Water Resort – 291, 301 So. Shore Drive, So. Yarmouth Portable, Seasonal 12 ft. X 12 ft. Deck The tasks outlined in the NOI relate to activities of placing the portable deck, an activity that will not significantly change the site. The proposed activity as described in the Notice of Intent fits to the category "other” is a form of redevelopment (Standard 7) and causes for no significant changes to the pervious areas nor significant changes in runoff volume. The site is within the coastal flood zone “VE”. Standard 7 is given here. 7. A redevelopment project is required to meet the following Stormwater Management Standards only to the maximum extent practicable: Standard 2, Standard 3, and the pretreatment and structural best management practice requirements of Standards 4, 5, and 6. Existing stormwater discharges shall comply with Standard 1 only to the maximum extent practicable. A redevelopment project shall also comply with all other requirements of the Stormwater Management Standards and improve existing conditions. A review of the Stormwater Standards is provided below: Standard 1: (Untreated discharges) No new storm water conveyances (e.g., outfalls) may discharge untreated stormwater directly to or cause erosion in wetlands or waters of the Commonwealth. There are no changes proposed that will alter the current acceptable conditions. In large part, surface runoff is discharged to level, sandy low-lying ground areas with a high infiltration rate. Standard 2: (Peak rate control and flood prevention) Storm water management systems must be designed so that post-development peak discharge rates do not exceed pre-development peak discharge rates. This Standard may be waived for land subject to coastal storm flowage. There is no change proposed to the site drainage installed in the sandy substrate above the groundwater. The building and parking area site is within the 100-year coastal flood “AE” zone. The beach is in the VE flood zone. The small deck is within VE and does not change runoff patterns. Any rainfall dissipates into the beach sand. Standard 3: (Recharge to Ground water) Loss of annual recharge to ground water shall be eliminated or minimized through the use of infiltration measures, including environmentally sensitive site design, low impact development techniques, best management practices, and good operation and maintenance. At a minimum, the annual recharge from the post-development site shall approximate the annual recharge from the pre- development conditions based on soil type. This Standard is met when the stormwater management system is designed to infiltrate the required recharge volume as determined in accordance with the Massachusetts Stormwater Handbook. Soil type is clean sand below grassed or gravel areas. The infiltration character of the predominant earth surfaced surrounding area will absorb incidental, ambient runoff. Site is within the immediate coastal area with sand substrate unrelated to drinking water supplies. The existing roof runoff and overall site runoff will not change and poses no potential for water supply concern. Standard 4: (80% TSS Removal) Stormwater management systems must be designed to remove 80% of the average annual post- construction load of Total Suspended Solids (TSS). This standard is met when: a. Suitable practices for source control and pollution prevention are identified in a long-term pollution prevention plan and thereafter are implemented and maintained; b. Stormwater BMPs are sized to capture the required water quality volume determined in accordance with the Massachusetts Stormwater Handbook; and c. Pretreatment is provided in accordance with the Massachusetts Stormwater Handbook. It is not practical to change the site’s over-land drainage character for this small project within a discreet portion of the site. This area surrounding this site segment is level, highly pervious. Drainage tendencies shall remain as they are. Given the general surface character and quality, site drainage tendencies are of a highly natural character. Standard 5 (Higher Potential Pollutant Loads (HPPL) For land uses with higher potential pollutant loads, source control and pollution prevention shall be implemented in accordance with the Massachusetts Stormwater Handbook to eliminate or reduce the discharge of stormwater runoff from such land uses to the maximum extent practicable. If through source control and/or pollution prevention, all land uses with higher potential pollutant loads cannot be completely protected from exposure to rain, snow, snow melt and stormwater runoff, the proponent shall use the specific stormwater BMPs determined by the Department to be suitable for such use as provided in the Massachusetts Stormwater Handbook. Stormwater discharges from land uses with higher potential pollutant loads shall also comply with the requirements of the Massachusetts Clean Waters Act, M.G.L. c. 21, §§ 26-53, and the regulations promulgated thereunder at 314 CMR 3.00, 314 CMR 4.00 and 314 CMR 5.00. This Standard is not applicable as the site is not subject to activities associated with higher pollutant loads. Standard 6 (Critical Areas) Stormwater discharges to a Zone II or Interim Wellhead Protection Area of a public water supply and stormwater discharges near or any other critical area require the use of the specific source control and pollution prevention measures and the specific stormwater best management practices determined by the Department to be suitable for managing discharges to such area, as provided in the Massachusetts Stormwater Handbook. A discharge is near a critical area if there is a strong likelihood of a significant impact occurring to said area, taking into account site-specific factors. Stormwater discharges to Outstanding Resource Waters or Special Resource Waters shall be set back from the receiving water and receive the highest and best practical method of treatment. A “stormwater discharge,” as defined in 314 CMR 3.04(2)(a)1. or (b), to an Outstanding Resource Water or Special Resource Water shall comply with 314 CMR 3.00 and 314 CMR 4.00. Stormwater discharges to a Zone I or Zone A are prohibited unless essential to the operation of the public water supply. Not applicable. No project relationship to such critical areas exists. Standard 7 (Redevelopment) 7. A redevelopment project is required to meet the following Stormwater Management Standards only to the maximum extent practicable: Standard 2, Standard 3, and the pretreatment and structural best management practice requirements of Standards 4, 5, and 6. Existing stormwater discharges shall comply with Standard 1 only to the maximum extent practicable. A redevelopment project shall also comply with all other requirements of the Stormwater Management Standards and improve existing conditions. The project checklist is reviewed under the Standard 7 Criteria with all Standards discussed. Standard 8: (Erosion, Sediment Control) A plan to control construction-related impacts, including erosion sedimentation and other pollutant sources during construction and land disturbance activities (construction period erosion, sedimentation, and pollution prevention plan), must be developed and implemented. • With the existing crushed aggregate and natural ground surfaces near to and within the construction area as a level surface, and with limitations on the available room for vehicle and equipment maneuvering the runoff threat is minimized. • Work activity limits are designated as the currently accessible areas of the site. The access and placement of the deck occur in clean unvegetated beach sand on a level area. There are no debris resulting from the project of placing the fabricated deck into position. Worker guidelines shall be in place to eliminate discarding of any worker-related items, coffee cups, andchor hardware, etc. Standard 9: (Operation and Maintenance) A long-term operation and maintenance plan must be developed and implemented to ensure that stormwater management systems function as designed. The facility is seasonal resort within the coastal flood zone. The site portions, beach, parking, patio surfaces are quite level within a coastal flood zone. Runoff is slowed by the level land character. The drainage of the existing site has caused for no reported hardships. • Pollution prevention measures are part of the ongoing practice at the facility as a significant relationship to its own welfare resulting from the nature of this business, e.g. a clean enjoyable resort setting for families. The applicant has a keen sensitivity for maintaining clean, safe, natural environmental conditions. Standard 10 (Illicit Discharges) All illicit discharges to the stormwater management system are prohibited. Based upon my knowledge, information and belief, there are no illicit discharges to the ground or storm water management systems at the property. Roof runoff volume is of a relatively clean nature and is understood to be innocuous. The site use and activities do not utilize or generate hazardous or illicit materials.