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HomeMy WebLinkAbout2003-05-06 Response Comments Site Plan Review & WSP CHRISTIANSEN , INC. PROFESSIONAL ENGINEERS AND LAND SURVEYORS 160 SUMMIR STREET €fAVERHILL, MASSACHUSETTS 01830-6318 (978)373-0310 FAX: (978)372-3960 March 19, 2003 Justin Woods Town Planner 27 Charles Street MAR 19 'P()013 North Andover MA 01845 NORI-1-1 ANDOVE-VA RE: Site Plan for Napoli Trucking PLANNING XPAI f-IVIENT Clark Street Dear Mr. Woods, The following response to VHB's review letter of March 4, 2003 is in the same format as the review letter for convenience of review. I. WATERSHED SPECIAL PERMIT 1. The lot was created prior to 1994 as stated by the consultant. At the time of the filing we were not aware of any wetland resource areas within 325 feet of the property. As a result of your question we have looked at the MASS GIS database and found the attached wetlands map. Using that map a portion of the detention area and a small portion of the pavement is within 325 feet of a wetland tributaay to the Lake. 2. 1 certify that the proposed project will not degrade the quantity or quality of water entering Lake Cochichewick. 3. This project is proposed on a lot created prior to October 24,1994 and the buildings proposed are greater than 325 feet from Lake Cochichewick and greater than 325 feet from Wetland Resource Areas in the Watershed District. The detention pond and a portion of pavement are within 325 feet of a wetland that is in the watershed. Napoli trucking is presently located in North Andover on Inglewood Street and has been asked by the Building Inspector to relocate. Napoli Trucking filed with the Board of Appeals to stay at its existing location, That request was denied. This is the only site Napoli has been able to locate in North Andover. Additionally the Board of Appeals has requested that Napoli Trucking be relocated by May 2003. The deadline leaves little time for alternative sites evaluation. Clark Street Review, page 2 4. The use of fertilizer is not proposed on the site. Construction activities will not cause creation of nitrogen in the groundwater greater than the Federal limit at the property boundary. Sewage will be disposed of by sewer not septic systems. 5. The proposed buildings are outside the non-disturbance zone. A small portion of the site is within the non-discharge zone but is an allowed use by special permit. See attached MA GIS wetlands photo. 6. No fuel will be stored on site. The buildings will be equipped with floor drains that discharge into an oil separator which discharges to the sewer system. II. SITE PLAN REVIEW 1. I concur with the comment 2. We hereby request a waiver from a traffic study because of the limited number of vehicles Napoli Trucking owns. III DRAINAGE REVIEW 1. The ponding is for short periods of time and in a limited area of the parking lot. This type of ponding occurs in almost all situations because of limited inlet grate capacity. This is rarely analyzed by most engineers. Most analyses will show 100- year storms entering a catch basin and draining to a detention pond. However in order for the catch basin to catch the projected flow rates the roadways would be flooded to the crown of the road and most of the water bypasses the grate. I prefer to leave the design as it is. To change the design so that all areas of the parking lot are not flooded during a 100 year storm is not reasonable. A proper hydrologic and hydraulic analysis of all projects even those designed by VHB will show that the catch basins proposed for roadways and parking lots do not have the capacity to carry large storm flows without a head over the grate. The head over the grate is flooding. A review of the plan will show that the flooding is limited to the southerly portion of the property and will not affect safe access or egress to the property. 2. Each catch basin is proposed to have a double top. I will correct the detail sheet to show that. 3. Page 4 of the calculations shows that for the 10-yr storm the peak elevation in pond I is 159.86 not 160 as you suggest. The peak elevation in the 100-year storm is 160 as shown on page 4. Clark Street Review, page 3 4. Flooding will not occur between the building corners and 20 feet from the building. At 20 feet from the building the depth of the water will be zero and increase to 6 inches at the catch basin. On the southeast corner of the building the distance from the 160 contour to the catch basin is 50 feet. Half way from the building corner to the basin, a distance of 25 feet the water will be 3 inches deep. That point is 45 feet from the building corner. This hardly represents an impediment to travel. The flooding during the 100-year storm occurs during hours 11.60 to 12.30. That represents a total time of flooding at 42 minutes in a 100-year event. Only for 18 minutes of that time is the water above 3 inches deep. 5. As VHB has properly pointed out the pond level in Pond 2 of 157.15 is higher than the inlet invert. This level is almost instantaneous. However, to eliminate any concern I have lowered the secondary outlet to elevation 155.5 and increased it to a 10 inch diameter hole. The peak elevation is reduced to below the inlet invert. 6. The comment is correct and the plan will be adjusted. 7. We did not propose to account for infiltration as a way of sizing the infiltration chambers. That is we designed the chambers to hold all of the required recharge water. In fact as shown in the original submittal the infiltration storage provided is 3 times that required. We did not rely on infiltration to reduce the size of the chambers. The SCS says the soil is a Paxton with a water table greater than 6 feet. The C horizon of Paxton soils are described as a Sandy Loam, The Mass DEP has stated in proposed infiltration recharge guidelines that sandy loams have an infiltration rate of 1 inch per hour. Applying that infiltration rate the full chambers would empty in 30 hours. However as a result of your review we performed soil test on site and found the parent soil is a stony, gravelly medium sand. The water table is greater than seven feet. The locations of the tests have been added to the plan and the test results are attached. The infiltration rate for sand as stated by the MADEP is 8.27 in/hr. The chambers would empty in less than 4 hours. 8. See the above discussion. Clark Street Review,page 4 IV General Review 1. We are aware of the NPDES requirements. Very yuly yours q1PChristiansen Cc: T. McIntosh Steve Webster Louis Napoli Enc. i March 17,2003 REGOVED Justin Woods Town Planners 27 Charles Street North Andover MA 01845 t�c�9-�`iG DlipAND RTM t'1�A1ViV1N���,PAI�`fMENT Dear Mr. Woods, The following response to Vanesse Hangans review letter of March 4, 2003 is in the same format as the review letter for convenience of review. I. WATERSHED SPECIAL PERMIT I.The lot was created prior to 1994 as stated by the consultant. At the time of the filing we were not aware of any wetland resource areas within 325 feet of the property. As a result of your question we have looked at the MASS GIS database and found the attached wetlands map. Using that map a portion of the detention area and a small portion of the pavement is within 325 feet of a wetland tributary to the Lake. The applicant is not aware of any wetland resource areas within 325 feet of the proposed work. 2. I certify that the proposed project will not degrade the quantity or quality of water entering Lake Cochichewick. 3.This project is proposed on a lot created prior to October 24,1994 and the buildings proposed are greater than 325 feet from Lake Cochichewick and greater than 325 feet fiom Wetland Resource Areas in the Watershed District. The detention pond and a portion of pavement are within 325 feet of a wetland that is in the watershed. Napoli trucking is presently located in North Andover on Inglewood Street and has been asked by the Building Inspector to relocate. Napoli Trucking filed with the Board of Appeals to stay at its existing location. That request was denied. This is the only site Napoli has been able to locate in North Andover. Additionally the Board of Appeals has requested that Napoli Trucking be relocated by May 2003. The deadline leaves little time for alternative sites evaluation. 4. The use of fertilizer is not proposed on the site. Construction activities will not cause creation of nitrogen in the groundwater greater than the Federal limit at the property boundary. Sewage will be disposed of by sewer not septic systems. 5. The proposed buildings are outside the non-disturbance zone. A small portion of the site is within the non-discharge zone but is an allowed use by special permit. See attached MA GIS wetlands photo. 6.No fuel will be stored on site. U SITE PLAN REVIEW 1. I concur with the comment 2. We hereby request a waiver from a traffic study because of the limited number of vehicles Napoli Trucking owns. III DRAINAGE REVIEW 1. The ponding is for short periods of time and in a limited area of the parking lot. I prefer to leave the design as it is, This type of ponding occurs in almost all situations because of limited inlet grate capacity. This is rarely analyzed by most engineers. Most analyses will show 100-year storms entering a catch basin and draining to a detention pond. However in order for a catch basin to catch the projected flow rates for roadway designs for instance, roadways would be flooded to the crown of the road and most of the water bypasses the grate. To change the design so that all areas of the parking lot are not flooded during a 100 year storm is not reasonable. A proper hydrologic and hydraulic analysis of all projects even those designed by VHB will show that the catch basins proposed for roadways and parking lots do not have the capacity to carry large storm flows without a head over the grate. The head over the grate is flooding. A review of the plan will show that the flooding is limited to the southerly portion of the property and will not affect safe access or egress to the property. 2. Each catch basin is proposed to have a double top. I will correct the detail sheet to show that. 3.Page 4 of the calculations shows that for the 10-yr storm the peak elevation in pond 1 P is 159.86 not 160 as you suggest. The peak elevation in the 100-year storm is 160 as shown on page 4. 4. Flooding will not occur between the building corners and 20 feet from the building. At 20 feet from the building the depth of the water will be Zero and increase to 6 inches at the catch basin. On the southeast corner of the building the distance from the 160 contour to the catch basin is 50 feet. half way from the building corner to the basin, a distance of 25 feet the water will be 3 inches deep. That point is 45 feet from the building corner. This hardly represents an impediment to travel. The flooding during the 100-year storm occurs during hours 11.60 to 12.30. That represents a total time of flooding at 42 minutes in a 100-year event. Only for 18 minutes of that time is the water above 3 inches deep. 5. As VHB has properly pointed out the pond level in Pond 2 of 157.15 is higher than the inlet invert. This level is almost instantaneous. However, to eliminate any concern I have lowered the secondary outlet to elevation 155.5 and increased it to a 10 inch diameter hole. The peak elevation is reduced to below the inlet invert, 6. The comment is correct and the plan will be adjusted. 7. We did not propose to account for infiltration as a way of sizing the infiltration chambers. That is we designed the chambers to hold all of the required recharge water. In fact as shown in the original submittal the infiltration provided is 3 times that required. We did not rely on infiltration to reduce the size of the chambers. The soil is a Paxton with a water table greater than 6 feet. The C horizon of Paxton soils are described as a Sandy Loam. The Mass DEP has stated in proposed infiltration recharge guidelines that sandy loams have an infiltration rate of 1 inch per hour. Applying that infiltration rate the full chambers would empty in 30 hours. Since the chambers are 3 times larger than necessary the required infiltration quantity would be accomplished in 10 hours. I am quite comfortable using the SCS description of the soils to design the infiltration system. Also given the time constraints imposed on the applicant by the Zoning Board of Appeals to move his operation, requiring testing now would be unacceptable. If however a condition of the approval would require testing before construction begins and to submit a redesign if the testing proved different fiom the assumptions would be appropriate. 8. See the above discussion. IV General Review 1. We are aware of the NPDES requirements. Very truly yours Philip Christiansen P Woods, J. Justin From: Phil Christiansen [pchristiansen@christiansensergi.com] Sent: Monday, March 17, 2003 2:25 PM To: jwoods@townofnorthandover.com Subject: Napoli Trucking i review comments.doc Responses to VHB The attached is a response to VHB minus the attachments which I will £oward shortly. I am at present having some computer problems. But I wanted to get this response to you Phil Christiansen 1 CHRISTIANSEN & SERGI, INC. PROFESSIONAL ENGINEERS AND LAND SURVEYORS 160 SUMMER STREET HAVERHILL, MASSACHUSETTS 01830-6318 (978)373-0310 FAX; (978) 372-3960 April 1, 2003 Mr. Justin Woods Planning Director Office of the Planning Department 1w)6VE-11 27 Charles Street -ftq 17-NT North Andover MA 01845 Dear Justin: Attached are 10 copies of the revised Special Permit Plans for the Napoli Trucking Project on Clark Street. The plans include, all of the corrections that resulted from the VfIB reviews as well as a landscaping plan developed as a result of the discussions at the last Planning Board meeting. On March 19,2003 1 sent revised plans to VHB by overnight mail that included all - of the changes to that date, including adjusted catch basin rims and soil testing results. The plans contained herein are different from those sent on the 19th in the following matters: 1. The 325 foot non-discharge line has been adjusted 2. A landscaping berm has been added to satisfy the VBB concern that the parking lot could overflow during a storm and flood the adjoining property (I spoke to VHB on 3/27 to confirm their concern before changing the plan). 3. A landscaping plan has been added 4. The fence has been removed I trust that these changes are satisfactory to you, if you have any questions please call me. Very t o 's iilip istiansen c.c. Tim McIntosh VBB CHRISTIANSENq INC. PROFESSIONAL ENGINEERS AND LAND SURVEYORS 160 SU[VIMLR.STI L.ET HAVERHILL, MASSACHUSETTS 01930-6318 (978) 373-0310 rAX: (978) 372-3960 t November l4, 2006 RECEIVED North Andover Planning Board 1600 Osgood Street NOV `I 4 N06 North Andover MA 01845 NON I tj HivuUVER ,3 PLANNING DEPARTMENT Re: Napoli Trucking, Clark Street, - : " Dear Board Members: Attached is an As-built plan for the Napoli Trucking Facility on Clark Road. The buildings, infiltration areas, catch basins, drain pipes, detention pond, and parking lot were built in substantial conformance with the approved plan. Xryt you / ristiansen