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HomeMy WebLinkAbout1000-90.-2-1PLANNING BOARD MEMBERS JERILYN B. WOODHOUSE Chair KENNETH L. EDWARDS MARTIN H. SIDOR GEORGE D. SOLOMON JOSEPH L. TOWNSEND MAILING ADDRESS: P.O. Box 1179 Southold, NYl1971 OFFICE LOCATION: Town Hall Annex 54375 State Route 25 (cot. Main Rd. & Youngs Ave.) Southold, NY Telephone: 631 765-1938 Fax: 631 765-3136 PLANNING BOARD OFFICE TOWN OF SOUTHOLD James King, President Town of Southold Board of Trustees From: Mark Terry, Senior Environmental Planner LWRP Coordinator Date: August 22, 2006 (REVISED) Request for Wetland Permit for Sim Moy SCTM#1000-90-2-1 Suffolk Environmental Consulting, Inc. on behalf of SIM MOY requests a Wetland Permit to construct a single-family dwelling, attached rear deck, pervious driveway, retaining wall, and sanitary system. Located: 750 West Lake Rd., Southold. SCTM#90-2-1 As you are aware, on August 25, 2005 a Consistent recommendation was proposed for the action with consideration with all supporting documentation submitted by the applicant including a document entitled "Groundwater Flow Analysis for Moy Property" dated August 15, 2005 and prepared by Suffolk Environmental Consulting. Following the Consistent recommendation, Mr. Ron Paulsen, a Hydrogeologist with the Suffolk County Department of Health Services reviewed the document and submitted a letter dated April 4, 2006 identifying discrepancies within the document and outlining concerns with soil permeability. Correspondingly, Camp Dresser & McKee (CDM) also reviewed the report and found discrepancies. Therefore, the proposed action has been re-reviewed to Chapter 95, Waterfront Consistency Review of the Town of Southold Town Code and the Local Waterfront Revitalization Program (LWRP) Policy Standards. Based upon the information provided on the LWRP Consistency Assessment Form submitted to this department, new information and as well as the records available to me, it is my recommendation that the proposed action is INCONSISTENT with the denoted following Policy Standards and therefore, is INCONSISTENT with the LWRP. I Policy 5 Protect and improve water quality and supply in the Town of Southold. 5.1 Prohibit direct or indirect discharges that would cause or contribute to contravention of water quality standards. 5.3 Protect and enhance quality of coastal waters. 5.4 Limit the potential for adverse impacts of watershed development on water quality and quantity. 5.5 Protect and conserve the quality and quantity of potable water. As indicated above the applicant fails to prove that the above policy and sub-policies will be met. Policy 6 Protect and restore the quality and function of the Town of Southold ecosystem. 6.3 Protect and restore tidal and freshwater wetlands. A. Comply with statutory and regulatory requirements of the Southold Town Board of Trustees laws and regulations for all Andros Patent and other lands under their jurisdiction Comply with Trustee regulations and recommendations as set forth in Trustee permit conditions. The deck structure setback located on the west side of the structure from the bnlkhead is proposed at 24 feet and the deck structure located on the south side of the structure is 26 feet (map dated aa received July 6~ 2006)~ a minimum setback distance of 100 feet is required pursuant to Chapter 275-3. CC: Shawn Kiernan, New York Department of State, Division of Coastal Resources PLANNING BOARD MEMBERS JERILYN B. WOODHOUSE Chair WILLIAM J. CREMERS KENNETH L. EDWARDS MARTIN H. SIDOR GEORGE D. SOLOMON MAIl.lNG ADDRESS: P.O. Box 1179 Southold, NY 11971 OFFICE LOCATION: Town Hall Annex 54375 State Route 25 (cor. Main Rd. & Youngs Ave.) Southold, NY Telephone: 631 765-1938 Fax: 631 765-3136 PLANNING BOARD OFFICE TOWN OF SOUTHOLD To: Town of Southold Board of Trustees From: Mark Terry, Senior Environmental Planner LWRP Coordinator Date: August 23, 2005 Re: Request for Wetland Permit for Sim Moy SCTM# 1000-90.-2-1 SIM MOY requests a Wetland Permit to construct a single-family dwelling, attached rear deck, pervious drivewav, retaining wall and sanitary system. Located: 750 West Lake Rd., Southold. SCTM# 90-2-1. The parcel is located on Little Peconic Bay. The proposed action has been reviewed to Chapter 95, Waterfront Consistency Review of the Town of Sonthold Town Code and the Local Waterfront Revitalization Program (LWRP) Policy Standards. Based upon the information provided on the LWRP Consistency Assessment Form submitted to this department, as well as the records available to me, it is my recommendation that the proposed action is generally CONSISTENT with the Policy Standards and therefore is CONSISTENT with the LWRP provided that the following standard best management practices are implemented. 1. Require water quality protection measures for areas generating rtmoff (gutters, downspouts, dry wells and pervious driveways) post construction. Depth to groundwater is extremely shallow. To further Policy 5 and protect surface and ground water quality and conserve water supply to the greatest extent possible it is requested that the Board require the following best management practices for landscaping and lawn establishment post construction: 1. Require native landscaping to minimize irrigation and avoid fertilizer applications. 2. Require disease-resistant and drought-tolerant plants (where possible). 3. Retain existing vegetation within non-disturbed buffers to minimize lawn areas. Pursuant to Chapter 95, the Board of Trustees shall consider this recommendation in preparing its written determination regarding the consistency of the proposed action. Please contact me at (631) 765-1938 if you have any questions regarding the above. ~. ~Town of Southold LWRP CONSISTENCY ASSESSMENT FORM A. INSTRUCTIONS All applicants for permits* including Town of Southold agencies, shall complete this CCAF for proposed actions that are subject to the Town of Southold Waterfront Consistency Review Law. This assessment is intended to supplement other information used by a Town of Southold agency in making a determination of consistency. *Except minor exempt actions including Building Permits and other ministerial permits not located within the Coastal Erosion Hazard.4rea. Before answering the questions in Section C, the preparer of this form should review the exempt minor action list, policies and explanations of each policy contained in the Town of Southold Local Waterfront Revitalization Program. A proposed action will be evaluated as to its significant beneficial and adverse effects upon the coastal area (which includes all of Southuld Town). If any question in Section C on this form is answered "yes", then the proposed action may affect the achievement of the LWRP policy standards and conditions contained in the consistency review law. Thus, the action should be analyzed in more detail and, if necessary, modified prior to making a determination that it is consistent to the maximum extent practicable with the LWRP policy standards and conditions. If an action cannot be certified as consistent with the LWRP policy standards and conditions, it shall not be undertaken. A copy of the LWRP is available in the following places: online at the Town of Southold's website (southoldtown. nortlffork.net), the Board of Trustees Office, the Planning Department, all local libraries and the Town Clerk's office. B. DESCRIPTION OF SITE AND PROPOSED ACTION SCTM# 090 - 02 001 The Application has been submitted to (check appropriate response): Town Board [] Planning Dept. [] Building Dept. [] Board of Trust6es [] 1. Category of Town of Southold agency action (check appropriate response): (a) Action undertaken directly by Town agency (e.g. capital construction, planning activity, agency regulation, land transaction) (b) Financial assistance (e.g. grant, loan, subsidy) (c) Permit, approval, license, certification: Nature and extent of action: Aoolicant oroposes to construct a private single-family dwellino (3 bedrooms)~ attached rear deek~ pervious driveway~ retaining wahi deposition of el,n~ fill~ and sanitarv system, all within sub|eet property. ~ttach additional sheets if necessary Policy 3. Enhance visual quality and protect scenic resources throughout the Town of Southold. See LWRP Section IH - Policies Pages 5 through 7 for evaluation criteria [] Yes [] No [] Not Applicable Subject proposal will not adversely impact the visual quality of the surrounding area in that the surrounding ama is currently comprised of properties improved with single-family dwellings of similar, if not larger, ~ize. Scenic resources, assumedly views of Little Peconic Bay to the south, are not at dsk due to the property being situated at the end of West Lake Drive which results in only one adjacent parcel, to the west, which potentially be impacted, and which is also owned by the applicant. Furthermore, this policy could not preclude the legal creation of this property as a building lot. Attach additional sheets if necessary NATURAL COAST POLICIES Policy 4. Minimize loss of life, structures, and natural resources from flooding and erosion. See LWRP Section HI - Policies Pages 8 through 16 for evaluation criteria [] Yes [] No [] Not Applicable Subject proposal will fully comply with Policy 4 in that the property is currently improved with a bulkhead along the southem and eastern property boundaries, as well as to the north, along the northern edge of West Lake Drive. Accordingly, the property is substantially protected from flooding and/or erosion and therefore wi[I not result in any form of loss of life, structures, and natural resources from flooding and erosion, as a result of subiect proposal. Attach additional sheets if necessary Policy 5. Protect and improve water quality and supply in the Town of Southold. See LWRP Section HI - Policies Pages 16 through 21 for evaluation criteria [] Yes [] No [] Not Applicable Subject proposal will comply with Policy 5 in that the property will utilize public watert as well as to install an efficient sanitary systemt compliant with the requirements of the Suffolk County Department of Health Services, Accordingly~ no adverse impacts to eith~ the water quality and/or water supply of Southold Town are anticipated. Attach additional sheets if necessary Policy 6. Protect and restore the quality and function of the Town of Southold ecosystems including Significant Coastal Fish and Wildlife Habitats and wetlands. See LWRP Section HI - Policies; Pages 22 through 32 for evaluation criteria [] Yes [] No [] Not Applicable Subject proposal will comply with Policy 6 in that the improving of this lawfully created residential building lot is to be designed to meet the environmental guidelines and requirements of both the Town of Southold Board of Trustees and the New York State Department of Environmental Conservation, and consequently, will maintain the integrity of the surrounding ecosystem. Attach additional sheets if necessary ~Policy 11. Promote sustainable use of living marine resources in Long Island Sound,.the Peconic Estuary and Town waters. See LWRP Section HI - Policies; Pages 57 through 62 for evaluatmn criteria [] Yes [] No [] Not Applicable Atlach additional sheets if necessary Policy 12. Protect agricultural lauds in the Town of Southold. Sec LWRP Section HI - Policies; Pages 62 through 65 for evaluation criteria [] Yes [] No [] Not Applicable Attach additional sheets if necessary Policy 13. Promote appropriate use and development of energy and mineral resources. Sec LWRP Section HI - Policies; Pages 65 through 68 for evaluation criteria. [] Yes [] No [] Not Applicable Attach additional sheets if necessary Created on 5/25/05 ll:20 AM WEST LAKE N10o39, o I 0 I Q I / / 30'0' / / Lot 118 now or former dohns EpiSCOpol Lot 119 HOUSE FF=IO.5 CRAWl. ~AGE LITTLE PECONIc BAy CJ. COVER TO GRADE GRADE 8.O' SEASONAL HIGH ~o' ~. I GROUND WATER ~ EL=I.5 SEP'nC TANK CESSPOOL 1000 GAL TEST HOLE DATA McDONALD GEOSCIENCE DEC. 20, 2004- EL=6.2 0.0 MIXED SAND AND LOAM GW 4.7 EL--1.5 WATER IN MIXED SAND AND LOAM 7.0 WATER IN BRO'WN BOG 13.0 WATER IN BROWN SILTY SAND 15.0 WATER IN PALE DROWN FINE TO COARSE SAND 17.0 Lot S 119, " Suffolk ( S.C.T.M.: 100( 2o Suffolk Environmental Consulting, Inc. Newman Village, Suite E, 2322 Main Street, P.O. Box 2003, Bridgehampton, New York 11932-2003 (631) 537-5160 Fax: (631) 537-5291 Bruce Anderson, M.S., President July 26, 2005 Mr. Albert J. Krup~ki, President Town Hall P.O. Box 1179 Southold, NY 11971 Re: Situate: SCTM It: MOY Application s/s West Lake Drive; Bayview; Town of Southoid, NY Shelter Island, NY 1000 - 090 - 02 - 001 Dear Mr. Krupski, As you know, this Firm represents Mr. Moy, owner of the above referenced property, who is pending approval from your Board to improve thereon. In order to fulfill the completeness of our application, please find enclosed: (1) Local Waterfront Revitalization Program Consistency Assessment Form; Kindly include the enclosed item within our pending application package and finalize the review of same so that we may be scheduled before the next available Town of Southold Board of Trustees meeting. Should you have any questions regarding this matter, or require additional information, please feel free to contact this office at any time. Thank you as always for your attention and consideration. Sincerely, Matt D. Ivans eno. cc: S. Moy Town of Southold LWRP CONSISTENCY ASSESSMENT FO] INSTRUCTIONS 1. All applicants for permits* including Town of Southold agen, ~ proposed actions that are subject to the Town of Southold Wa ~onsistency Review Law. assessment is intended to supplement other information used by a Town of Southold agency in making a determination of consistency. *Except minor exempt actions including Building Permits and other ministerial permits not located within the Coastal Erosion Hazard Area. This Before answering the questions in Section C, the preparer of this form should review the exempt minor action list, policies and explanations of each policy contained in the Town of Southold Local Waterfront Revitalization Program. A proposed action will be evaluated as to its significant beneficial and adverse effects upon the coastal area (which includes all of Southold Town). If any question in Section C on this form is answered "yes", then the proposed action may affect the achievement of the LWRP policy standards and conditions contained in the consistency review law. Thus, the action should be analyzed in more detail and, if necessary, modified prior to making a determination that it is consistent to the maximum extent practicable with the LWRP policy standards and conditions. If an action cannot be certified as consistent with the LWRP policy standards and conditions, it shall not be undertaken. A copy of the LWRP is available in the following places: online at the Town of Southold's website (southoldtown.northfork.net), the Board of Trustees Office, the Planning Department, all local libraries and the Town Clerk's office. B. DESCRIPTION OF SITE AND PROPOSED ACTION SCTM# 090 - 02 001 The Application has been submitted to (check appropriate response): Town Board [] Planning Dept. [] Building Dept. [] Board of Trustees [] 1. Category of Town of Southold agency action (check appropriate response): (a) Action undertaken directly by Town agency (e.g. capital construction, planning activity, agency regulation, land transaction) (b) Financial assistance (e.g. grant, loan, subsidy) (c) Permit, approval, license, certification: Nature and extent of action: Applicant proposes to construct a private sino. le-family dwelling (3 bedrooms); attached rear deck; pervious driveway; retaining wall; deposition of clean ~l; and sanitary system, all within subieet proper .ty. Location of action: Site acreage: s/s West I~ake Road; Bayviewl Town of Southold~ NY 0.2 acre Present land use: Improved only with wood bulkhead Present zoning classification: If an application for the proposed action has been filed with the Town of Southold agency, the following information shall be provided: (a) Name of applicant: Sim H. Mo¥ (b) Mailing address: 106 Mulberry Street - Apartment 7; New Yorlq NY 10013 (c) Telephone number: Area Code ( 212 ) 431 - 8531 (d) Application number, if any: N/A Will the action be directly undertaken, require funding, or approval by a state or federal agency? Yes [--~ No[~ If yes, which state or federal agency? DEVELOPED COAST POLICY Policy 1. Foster a pattern of development in the Town of Southoid that enhances community character, preserves open space, makes efficient use of infrastructure, makes beneficial use of a coastal location, and minimizes adverse effects of development. See LWRP Section IH - Policies; Page 2 for evaluation criteria. [] Yes [] No [] Not Applicable As indicated within Policy 1, "Development that does not reinforce the traditional land use pattern of the Town of Southold would result in a loss of the community and landscape character of Southold.'~ this proiect is a proposal to improve upon a vacant lot situated in a neighborhood consisting primarily of similarly-sized single-family dwellings within similarly-sized properties. The proposalt as designed~ will not result in adverse effects to the surrounding environment in that the project has been designed in such a way as to maintain or exceed all required regulatory conditions associated with improving on a lot situated in proximity to the surface waters surrounding the Town of Southold. In additiont the surrounding neighborh°°d is c°mprised °f °lder residential dwellings which have existed harmoniously within this area for years and have not resulted in any form of adverse effects to the surrounding environment. Accordingly, we believe that this proiect is consistent with this policy. Attach additional sheets if necessary Policy 2. Protect and preserve historic and archaeological resources of the Town of Southold. See LWRP Section HI - Policies Pages 3 through 6 for evaluation criteria [] Yes [] No [] Not Applicable Poli~ 2 is not applicable in that subiect lot and the surrounding neighborhood cannot be deemed a substantial historic and/or archaeological resources. Attach additional sheets if necessary Policy 3. Enhance visual quality and protect scenic resources throughout the Town of Southold. See LWRP Section III - Policies Pages 5 through 7 for evaluation criteria [] Yes [] No [] Not Applicable Subject proposal will not adversely impact the visual quality of the surrounding area in that the surrounding area is currently comprised of properties improved with single-family dwellings of similar~ if not larger~ size. Scenic resourcest assumedly views of Little Peconic Bay to the south~ are not at risk due to the property being situated at the end of West Lake Drive which results in only one adjacent parcel, to the westr which potentially could be impacted~ and which is also owned by the applicant. Furthermore, this policy could not preclude the legal creation of this property as a building lot. Atlach additional sheets if necessary NATURAL COAST POLICIES Policy 4. Minimize loss of life, structures, and natural resources from flooding and erosion. Sec LWRP Section III -Policies Pages 8 through 16 for evaluation criteria [] Yes [] No [] Not Applicable Subject proposal will fully comply with Policy 4 in that the property is currently improved with a bulkhead along the southern and eastern property boundaries, as well as to the north, along the northern edge of West Lake Drive. Accordingly, the property is substantially protected from flooding and/or erosion and therefore will not result in any form of loss of life~ structures~ and natural resources from flooding and erosionr as a result of subiect proposal. Attach additional sheets if necessary Policy 5. Protect and improve water quality and supply in the Town of Southold. See LWRP Section III - Policies Pages 16 through 21 for evaluation criteria [] Yes [] No [] Not Applicable Subject proposal will comply with Policy 5 in that the property will utilize public water~ as well as to install an efficient sanitary system, compliant with the requirements of the Suffolk County Department of Health Services. Accordingly, no adverse impacts to either the water quality and/or water supply of Southold Town are anticipated. Attach additional sheets if necessary Policy 6. Protect and restore the quality and function of thc Town of Southold ecosystems including Significant Coastal Fish and Wildlife Habitats and wetlands. See LWRP Section III - Policies; Pages 22 through 32 for evaluation criteria [] Yes [] No [] Not Applicable Subject proposal will comply with Policy 6 in that the improving of this lawfully created residential building lot is to be designed to meet the environmental guidelines and requirements of both the Town of Southold Board of Trustees and the New York State Department of I:nvironm_ental Conservation, and consequently~ will maintain the integrity of the surrounding ecosystem. Attach additional sheets if necessary Policy 7. Protect and improve air quality in the Town of Southold. See LWRP Section III - Policies Pages 32 through 34 for evaluation criteria [] Yes [] No [] Not Applicable Subiect proposal is not applicable in that the proposal is simply to improve subiect property with a typical single-family dwelling and related appurtenances which historically do not result in any form of adverse effects to air quality. Accordingly, this proposal is not applicable with this policy. Attach additional sheets if necessary Policy 8. Minimize environmental degradation in Town of Southold from solid waste and hazardous substances and wastes. See LWRP Section III - Policies; Pages 34 through 38 for evaluation criteria. [] Yes [] No [] Not Applicable Subject proposal is not applicable in that the proposal does not involve disposal and/or transportation of solid waste, hazardous waste, toxic pollutants~ petroleum products. Attach additional sheets if necessary PUBLIC COAST POLICIES Policy 9. Provide for public access to, and recreational use of, coastal waters, public lands, and public resources of the Town of Southold. See LWRP Section IH - Policies; Pages 38 through 46 for evaluation criteria [] Yes [] No [] Not Applicable Subject proposal is not applicable to this policy in that the proposal will not impede any access to the sudace waters in and around subject properly and/or become detrimental to the recreational use of the surrounding resources. Attach additional sheets if necessary WORKING COAST POLICIES Policy 10. Protect Southold's water-dependent uses and promote siting of new water-dependence uses in suitable locations. See LWRP Section HI - Policies; Pages 47 through 56 for evaluation criteria [] Yes [] No [] Not Appllcable Subiect proposal is not applicable in that the proposal does not involve a water<tependent use (i.e. marinat aquaculture, etc...). AC, ach additional sheets if necessary Policy 11. Promote sustainable use of living marine resources in Long Island Sound, the Peconic Estuary and Town Waters. See LWRP Section III - Policies; Pages 57 through 62 for evaluation criteria [] Yes [] No [] Not Applicable Subject proposal is not applicable in that the proposal does not involve any form of marine resource management (i.e. commercial fisheries~ recreational fisheries, aquaculturee etc...). Attach additional sheets if necessary Policy 12. Protect agricultural lands in the Town of Southold. See LWRP Section IH - Policies; Pages 62 through 65 for evaluation criteria. [] Yes [] No [] Not Applicable Subiect proposal is not applicable in that the proposal does not involve agricultural lands (i.e. the conversion of farmland, the establishment and/or maintenance of new coastal agricultural productiont etc...) Attach additional sheets if necessary Policy 13. Promote appropriate use and development of energy and mineral resources. See LWRP Section III - Policies; Pages 65 through 68 for evaluation criteria. [] Yes [] No [] Not Applicable Subiect proposal is not applicable in that the proposal does not involve the conservation of energy resources on a commercial level and/or the promotion of alternative energy sourcest proper maintenance of fuel storage facilities and/or the extraction of mineral extraction Attach additional sheets if necessary Created on 5/25/05 l l.'20 AM WEST LAKE NI0'$9, HOUSE. WEST LAKE '~'". ~A~OS""O'^~OEO~o~'o~LAS ~, / ~'~ ~ ~ oc~. ~, ~su~,~. ,~c. / / ~O.o, ~ '-' ~ ~ ~ / ~ ~ / ~/ ~,.~ Lo~ 118 w~,~ ,~ now ~. formerly ~ ~ St. dohns ~p~Scopql ~ Lot 119 BEACH LITTLE /::'ECONIc BAy' C.I. COVER TO GRADE GRADE SEASONAL HIGH GROUND WATER SEP'I1C TANK 1000 GAL EL=I.5 TEST HOLE DATA McDONALD GEOSCIENCE DEC, 20, 2004 EL=6,2 MIXED SAND AND LOAM GW EL=l,5 WATER IN MIXED SAND AND LOAM WATER IN 0.0 4.7 7.0 13.0 15.0 17.0 Sur~ Lot !19, "Ce~ B~ Suffolk Cou S.C.T.M.: 1000-0c. 20 SCA[ James F. King, President Jill M. Doherty, Vice-President Peggy A. Dickerson Dave Bergen John Holzapfel Town Hall 53095 Route 25 P.O. Box 1179 Southold, New York 11971-0959 Telephone (631) 765-1892 Fax (631) 765-6641 BOARD OF TOWN TRUSTEES TOWN OF SOUTHOLD MEMO August 22, 2006 To: Board of Trustees From: Heather Cusack Environmental Technician Re: Sim Moy application SCTM# 90-2-1 I have reviewed the file on the above referenced application. The following is my interpretation of the information regarding ground water flow in that lot as per the report from Suffolk Environmental Consulting, the Health Department and CDM's analysis, and the subsequent review by Suffolk Environmental Consulting. Please find attached to this memo the comments on the Groundwater Flow Analysis report written by Ron Paulsen, Hydro geologist for the Suffolk County Health Department. Based on my analysis of these documents the applicant has not sufficiently proved that the proposed septic system will not fail or cause a significant adverse impact to the aquifer, or the movement of nitrogen and phosphates into the open waters of Peconic Bay. One problem is the permeability of the existing soils, not the distance to groundwater. The clay material could affect the drainage of the septic system waste. The flow of waste is affected by the clays, causing problems with drainage and the breaking down of the waste. These soil conditions and water conditions, surrounded on tlu'ee sides by surface waters, will make a septic system less efficient in treating wastewater. The processes of microscopic organisms in soil breaking down the biological contaminants in a septic system only work if the soil is not saturated with water. If the soil is too wet biological breakdown may be incomplete and nutrients may move greater distances and possibly into surface waters. Even systems that are in compliance with the health department may allow nutrients to reach the water. CDM's review indicates that the groundwater flow analysis is not comprehensive enough to determine that the mount and quality of effluent that will reach the open water and the aquifer. The quantity coming from the Moy property was not calculated. I have attached CDM's report, written by Daniel O'Rourke, Project Hydro geologist. Please inform me if you would like a more detailed analysis from me of these documents. 1 O0 Crossways Park West Woodbury, New York 1 ~ 797 tel: 516496-8400 fax: 516496-8864 April 13, 2006 Ms. Heather Cusack Environmental Technician Town of Southold Board of Trustees P.O. Box 1179 Southold, NY 11791-0959 Subject: Review of Groundwater Flow Analysis for Moy Property Dear Ms. Cusack: Camp Dresser & McKee (CDM) has completed our review of the document entitled, "Groundwater Flow Analysis for Moy Property" dated August 15, 2005 prepared by Suffolk Environmental Consulting, Inc. In addition to our review, a site visit was conducted in which the conditions at the site were observed. Our review focused on the assessment of groundwater flow conditions at the property and the location of the proposed sanitary system with respect to West Lake and Little Peconic Bay. Although the document is thorough, particularly with respect to the discussion regarding groundwater flow direction, several concerns associated with the water levels used for the proposed sanitary system have been identified: According to both the Suffolk County Standards for Approval of Plans for Construction of Sewage Disposal Systems for Single-Family Residences (hereafter referred to as Suffolk Cotmty Standards) and 10 NYCRR Part 75-A, the bottom of the leaching pool must be at least two feet higher than the maximum seasonal water table elevation. Since the sanitary system will be located at the approximate location of Well #5, water table elevations at Well #5 should be used for design. Although using Well #5 data is mentioned in the text, the actual elevation of the water table shown on the drawing does not correspond to the maximum level measured. The groundwater elevation of 1.5 feet above mean sea level shown on the drawing appears to be measured from a test-pit located down-gradient of the proposed sanitary system. From the data listed in Tables I and 2, the maximum measured groundwater elevation at Well #5 is 2.59 feet above mean sea level (as measured 6/28/05). Using this value as the maximum water table elevation, the sanitary system design (using elevations shown on the survey) needs to be revised. consulting · engineering · construction · operations Ms. Heather Cusack April 13, 2006 Page 2 · In addition, since the area is under tidal influence, groundwater elevations measured at high tide are required to be used in the design. Finally, it should be noted that the water table in very shallow groundwater systems, such as the system on the North Fork, is quite sensitive to changes in precipitation. Groundwater elevations for this report were measured during late-June and early-July of 2005. Groundwater elevations are typically higher in the spring than during the summer months, as a result of a higher rate of recharge during the non-growing season. In addition, water levels were measured during a year of below average precipitation for June. Based on the precipitation gage at Brookhaven National Laboratory (BNL), long-term average precipitation during June is 3.51 inches, while recorded precipitation at the BNL station for June 2005 was only 1.48 inches. Following a wet period, it is likely that maximum water table elevations will be higher than 2.59 feet above mean sea level at high tide. Should the sanitary system be installed using summer 2005 water levels as maximum levels, the sanitary system may flood after a wet season. "High seasonal groundwater" refers to the maximum water level measured during a wet season (spring). The separation distance between the proposed sanitary system and the surrounding surface waters does not appear to be within those specified by 10 NYCRR Part 75-A or Suffolk County Standards. Unless prior approval has been issued by NYSDEC for these reduced separation distances, septic tanks must be at least 50 feet from surface waters and leaching pools must be 100 feet from surface waters. Our review confirmed that, based upon available data, groundwater flow direction is to the west-southwest, and using the measured water levels, sanitary effluent will discharge to the inlet of West Lake and Little Peconic Bay. Impacts to surface waters (West Lake and Little Peconic Bay) are addressed in the report by calculating travel time and assuming that approximately 98% of BOD, -10-40% nitrogen, 85-95% phosphorous and up to 99.99% of fecal coliforms will be removed by the sanitary system (based on the Onsite Wastewater Treatment Manual, published by EPA). However, there are no calculations (mass balance estimates) to estimate the nutrient contribution from the Moy property. From measured water levels, groundwater flow direction is predominately to the west, discharging to the inlet of West Lake. Although the inlet has a high degree of tidal flushing, during periods of high tide, water is flowing into the lake, carrying with it any contaminants in the groundwater discharge that discharges into the inlet. A calculation of flow contribution to the lake from the Moy property would be useful to determine any impact on the lake. Ms. Heather Cusack April 13, 2006 Page 3 Specific review comments are listed in Attachment A. Based upon the review of "Groundwater Flow Analysis for Moy Property", dated August 15, 2005, the following recommendations are offered: The design shown on the drawings shows a seasonal high groundwater table elevation of 1.5 feet mean sea level. This level is not the maximum water level measured at Well #5. The maximum water level measured at Well #5 should be used for design of the sanitary system, although the true seasonal maximum is likely higher than the summer 2005 levels that were recorded. Since water levels were recorded in the summer of 2005, during below average precipitation conditions, they are not likely to reflect the high seasonal water levels. It is recommended that additional water levels be collected at the site, preferably during a wet period in the spring and a day or two after a significant rain event. As required, these water levels also must be measured at high tide to provide more representative values of seasonal high water table elevations. Summer 2005 water levels are likely lower than the seasonal high water table elevation and the sanitary system may flood during wet periods. If you have any questions, please do not hesitate to contact me at (516) 496-8400 (Tuesday and Thursday) or (732) 225-7000 (Monday, Wednesday, Friday). I can also be reached via e-mail at: orourkede@cdm.com. Very truly~ Daniel O'Rourke Project Hydrogeologist Camp Dresser & McKee Inc. cc: Mr. Bruce A. Anderson (Suffolk Environmental Consulting, Inc.) Mary Anne Taylor, P.E. (CDM) Ms. Heather Cusack April 13, 2006 Page 4 Attachment A - Detailed Comments 1. In Section II, Materials and Methods, page 2, line 6 - The lengths of these test wells were 9fl for Wells 111 and 114, and 8fl for Wells #2, 3 and 5 a. Well screen intervals (either depth or elevations) would be useful.. 2. General on groundwater elevations The time of measurement would be useful so that estimated tide stage can be compared to the measurements. Direction of flow should be determined for each independent set of data, as opposed to an overall average, although the results do not differ significantly from those shown on Figure 6. 3. Tables 2, 4 and 6 should indicate depth to groundwater (inches from top of casing). 4. In Section IV, page 11, the text mentions that the water table is 5 feet below the surface at Well #5. Groundwater elevations from the test pits prior to well installation should not be used for design. Using the groundwater levels measured in Well 115, the maximum measured water level is 2.59 feet above mean sea level, which corresponds to approximately 3.74 feet below the surface (the approximate distance to the top of the well casing from the ground surface is 1'-8", as measured during the site visit). 5. In Section IV, page 11, although there is mention of Haven Loam having a permeability of 1.315 in/hr, there is no mention of a percolation test, which is required under both the Suffolk County Standards and 10 NYCRR Part 75-A. This may have been dismissed in this case, however, given the sandy soils in the area. 6. Section IV, page 12 - the Dupuit equation - q is flow per trait width (not area) and K is the hydraulic conductivity. It is not clear how the groundwater velocity of 37.826 ft/day was calculated. The value of K used (4,937.66 fi/d) is more than an order of magnitude higher than what is typically used for surficial sediments on Long Island. Therefore, the groundwater flow rate is inaccurate. If using the permeability mentioned on page 11 (1.315 in/hr), the hydraulic conductivity in the vertical direction is approximately 2.6 feet per day. Using a horizontal to vertical anisotropy ratio of 100:1, horizontal hydraulic conductivity is estimated at 260 feet per day. In addition, ho and hi in the equation are groundwater heads, not aquifer thickness. Also, note that density variations between fresh and salt-water have not been accounted for and calculating groundwater flow by Dupuit Ms. Heather Cusack April 13, 2006 Page 5 assumptions alone is an approximation (need Dupuit~Ghyben-Herzberg relationships to account for density differences). DAVID a. GRAHAM~ M.D.~ M,P.H. C]~Z~ DEHJ'I~ COMMI$$1OI~R COUNTY Ol SUFFOLK APR I t To: Ms Heather Cuscack, Town of Southold Date: 4/7/2006 Re: Groundwater Flow Analysis, Sim Moy Comments of the Report titled Groundwater Flow Analysis for Moy property are as followed; Section IV par 2 The elevation difference between the wells is compared assuming the distance between the wells is equal. This is probably not true and the distances are not provided. Section IV par 8 Cores reveal that grey organic clays and bogs are present between 4-8 ft and the aquifer may not represent your typical medium sand unconfined aquifer. The clay material and bog could affect drainage of the septic system waste. Section IV par 9-equation Value for coefficient of permeability of 4,937.66 fl per day is to high for determining groundwater flow. Typical values for long Island are 0-500 ft Id. Therefore the time of travel calculations are off. The clays and bogs present at the site may cause problems with the drainage of septic waste also they may impede the vertical flow of waste into the aquifer and short circuit the systems effectiveness in breaking down and dilute waste stream. The SCDHS Office of Waste Water Management has been notified of these concerns and they will be taken into account during their review process. Regards ~, Ron ~aulsen Hyrogeologist Suffolk County Department of Health Services Office Of Water Resources 124 Yaphank ave, Yaphank, NY · Office of Water Resources * Division of Environmental Quality 360 Yaphank Avenue, Suite lC Yaphank, NY 11980 Fhone: (631) 852.5789 Fax: (651) 852,5?8? N10'39, WEST LAKE ! LAK _ ?_wlo? DRIVE Lot 119 ~ LITTLE PECONIc BAy' C I COVER TO GRADE -- RNISHED GRADE TEST HOLE DATA SEPTIC TANK CESSPOOL NOTES: 1. TOTAL AREA = 8,861 S.F. (ADJACENT AREA) 2. 0 = SPIKE SET, e= REBAR FOUND. S. SUBBI~SION MAP "CEDAR BEACH PARK" FILED IN THE OFFICE OF THE CLERK OF SUFFOLK COUNTY ON DEC. 20, 1927 AS FILE NO. 90 Lot 118 4. ELEVATIONS SHOWN HEREON ARE REFERENCED TO N.G.V. DATHM (MSL 1929), now or fOrmer,, 5. THIS PARCEL IS WITHIN RRM ZONE AK(EL 8) AS iSCOpal lyC DILINEA~ED ON FIRM BOUNDARY MAP NO, St. Johns Ep hutch 6, APPROXIMATE FILL REQUIRED = 5610500169 G LAST DA'f~D MAY 04,, 1998. 180 CUBIC YARDS REQUIRED (FOR SANITARY), 7. ADJACENT LOT COVERAGE: HOUSE = 1,061 S.F. DECK = 506 S.F. TOTAL = 1.567 S.F. OR 17.7~ CERTIFIED TO: SII MO~ DAVID H. FOX, LS. P.C. N.Y.S. LS. ~50254 Survey for: Lo~ 1 19, "Cedar Beach Park" At Town of Sol,hold Suffolk County, New York S.C.T.M.: 1000-090.00-02.00-001.000 , , , _ SCALE:I =20 JUL G 2005 DWG: 2004--744