HomeMy WebLinkAboutLetters - DK Engineering 8.17.2016, 7.7.2016, & 6.15.2016 - lot 1 - Correspondence - 500 BOXFORD STREET 1/30/2020 DK ENGINEERING ASSOCIATES, INC.
Woodland Ridge Phone: (603) 898-8516 RECEIVED
47 Enterprise Drive,#7 E-mail:dan@dkengineering.net
P.O.Box 4260 www.dkengr.net AUG 18 201 R
Windham,NH 03087-4260
TOWN OF NORTH ANDOVER (�
HEALTH DEPARTP�IENT c
August 17, 2016
��\,
Town of North Andover
Health Department
1600 Osgood Street, Suite 2035
North Andover, MA 01845
Attn: Mr. Brian J. LaGrasse, CEHT—Director of Public Health
RE: Design Analysis for Siting Subsurface Sewage Disposal System on 500 Boxford Street-Lot 1
&2 (Map 105C,Lot 42)
Dear Mr. LaGrasse:
The following discussion intended to illustrate our analysis in siting the proposed subsurface
sewage disposal systems and buildings on Lot 1 and 2 at 500 Boxford Street.
310 CMR 15.232 (6), states, "Absorption trenches should be used whenever possible." It is
our opinion that alternative systems have their place where absorption trenches are not practical or
possible, such as replacement of failed systems. With this in mind, the houses and septic systems
were moved around the lots and resized to accommodate the Title V setbacks and to the maximum
extent possible, the North Andover Board of Health and Conservation setbacks. Specifically,
Lot 1
The house was designed to accommodate the building setback requirements. As shown, the
footprint of the dwelling minus the garage is approximately 1,300 s.f. The septic system was
placed at the rear of the building and approximately 63 feet from the wetlands. Moving the
septic system to the front of the lot as close to the lot line setbacks as possible, still required
a variance for the setback to the wetlands. Another problem is that the building will not fit
within the building setbacks as shown on the accompanying sketch. Additionally,
construction of the driveway to the building would require work within the Conservation
"25 foot no disturb zone".
Lot 2
A similar analysis was performed on Lot 2. Moving the septic system in front of the
proposed dwelling, would require the house to be set back 44 feet from the front lot line in
order to meet the Title V setback requirements. This would move the building within the 50
foot building setback from the wetlands. Also, the system would be within 100 feet of the
existing well. However, we were able to move the system closer to the front lot line
providing a greater setback from the wetlands of approximately 74 feet.
41607 Letter re Design Analysis 2016-08-17.docx
JN: 41607
Mr. Brian LaGrasse
August 17,2016
Page 2 of 2
The septic systems shown on these two lots meet all the requirements of Title V as required.
The relief requested is for the setback to the wetlands. We believe the building and septic
system configurations provide the least environmental impact to the area.
Accompanying this letter, please find the revised Subsurface Sewage Disposal Plan for Lot 2
dated August 17, 2016. As stated above, the system was moved closer to the front lot line to
provide more of a separation from the wetlands. Since the system on Lot 1 as shown on the plans
dated July 7, 2016 remained the same, the plans were not resubmitted.
Should you have any questions regarding the siting of the construction elements of the site,
please do not hesitate to contact me.
Yours truly,
DK ENGINEERI G ASSOCIATES,INC.
a4 ''
Daniel Koravos,P.E.
President
cc: Mr. William MacLeod,Andover Consultants, Inc.
DK ENGINEERING ASSOCIATES, INC.
JN: 41607
�= DK ENGINEERING ASSOCIATES, INC.
Woodland Ridge Phone: (603) 898-8516
47 Enterprise Drive,#7 E-mail:dan@dkengineering.net
P.O.Box 4260 www.dkengr.net
Windham,NH 03087-4260
July 7, 2016
RECEIVED
Town of North Andover JUL 12 2016
Health Department
1600 Osgood Street, Suite 2035 TOWN OF NORTH ANDOVER
North Andover, MA 01845 HEALTH DEPARTMENT
Attn: Mr. Brian J. LaGrasse, CEHT—Director of Public Health
RE: Subsurface Sewage Disposal System Plan for 500 Boxford Street-Lot 1 (Map 105C,Lot 42)
Dear Mr. LaGrasse:
The following is in response to the review comment as outlined in your letter dated June 27,
2016:
Response: The Assessor's Map and Lot numbers have been added to the title block and on
sheet 2.
1. The exi ting and pmposed lot lines should be depicted on the design plan. On page two of three,please depict the original
three lots and overlay the proposed two lots being created with the proposed dwellings,proposed ystems and all lot line
setbacks, the 100'wetland buffer Zone,50'no build Zone and 25'no disturbance Zone.
Response: Sheet two of three has been updated with the information requested.
2. Note 7 is repeated as note 17.
Response: Note 17 has been removed.
3. Lot 1 as pmposed does not have a benchmark and the benchmark on Lot 2 in not within 50-75'from the proposed system
(310 CMR 15.220(4)(g).
Response: A new benchmark has been added to the plan.
4. Indicate why the soil absorption system cannot be pmposedgreater than 100 feet from the wetland resource area and whyyou
cannot comply with section 3.9 of the North Andover Septic Regulations. There is an area in the,southeast corner of the
proposed lot that is greater than 100 feet from the wetland resource area. Please research alternative designs and site layouts
that keep the systems out of the 100'buffer Zone or designs that achieve maximum feasible compliance. Please also note that
Section 3.8 of the North Andover Septic Regulations state that a DEP approved device or alternative technology which
reduces wastewater to levels below 30 mg/L BOD and 30mg/L TSS can be approved by the department without a hearing
before the Board of Health. I have attached a rough sketch that shows 100 linear feet of primary and reserve trenches that
me out of the 100'as a rough demonstration.
Response: The layout of the trenches provided is not feasible. 310 CMR 15.232 (1) states "For
all gravity flow distribution systems, a water tight distribution box designed to
provide equal distribution of septic tank effluent to the distribution lines of the soil
41607 Response Letter re Lot 1 SSDS Comments 2016-07-07.docx
JN: 41607
Mr. Brian LaGrasse
June 15, 2016
Page 2 of 2
Response: A benchmark has been added to the plan and a note stating additional benchmarks
will be set prior to construction.
J8. The foundation drain location and elevation were not depicted on the de ign plan (NA 3.2).
Response: The foundation drain has been added to the plan on sheet 1. Also on sheet 1 note
17 was added indicating the setback requirements.
9. Depict the setback distance from the proposed well to abutting soil absorption systems to ensure compliance with 310 CMR
15.211.
Response: To the south of the proposed well, a 100 foot offset is within the right-of-way of
Boxford Street. The westerly property line is within 28 feet of the wetland on the
abutting property. The 100 foot offset from the proposed well is approximately
twelve feet from the lot line and 18 feet from the wetlands. The easterly lot line of
the property is approximately 125 feet from the proposed well.
J10. On sheet 3 of 3, the loading (H-10 or H-20) of the septic tank was not depicted on the design plan (310 CMR
15.226(3)).
Response: Note 3 on sheet 3 has been added stating that the septic tank shall meet H10
loading requirements.
11. 6"of crushed stone is required beneath the&stribution box(310 CMR 15.221(2)).
Response: In the "Concrete Distribution Box" on sheet 3, note 3 was added stating that 6
inches of crushed store is required beneath the distribution box.
12. On sheet 3 of 3, explain the purpose for the "untreated building paper" above the peastone layer in the soil absorption
system. Also explain how the use of the untreated building paper is in compliance with Title 5 regulations.
• Response: The "untreated building paper" is provided to assist in preventing fines from
entering the stone trenches and help minimize surface water from inundating the
system. a pwas-`
I believe all you concerns have been addressed. Should you have any question or require
additional information, please do not hesitate to contact me.
Yours truly,
DK ENGINEERING ASSOCIATES, INC.
6 V� �ajlfl/
Daniel Koravos, P.E.
President
cc: Mr. William MacLeod,Andover Consultants, Inc.
DK ENGINEERING ASSOCIATES, INC.
JN: 41607
DK ENGINEERING ASSOCIATES, INC.
Woodland Ridge Phone: (603) 898-8516
47 Enterprise Drive,#7 E-mail:dan@dkengineering.net
P.O.Box 4260 www.dkengr.net
Windham,NH 03087-4260
June 15, 2016
Town of North Andover RECEIVED
Health Department
1600 Osgood Street, Suite 2035 IUN 2 'I 2016
North Andover, MA 01845
TOWN OF NORTH ANDOVER
HEALTH DEPARTMENT
Attn: Mr. Brian J. LaGrasse, CEHT—Director of Public Health
RE: Subsurface Sewage Disposal System Plan for 500 Boxford Street-Lot 1 (Map 105C, Lot 42)
Dear Mr. LaGrasse:
The following is in response to the review comment as outlined in your letter dated June 9,
/ 2016:
/ 1. The Assessor's map and lot numbers are not indicated on the design plan(NA 3.2).
Response: The Assessor's Map and Lot numbers have been added to the title block and on
sheet 2.
2. The existing and proposed lot lines should be depicted on the design plan.
Response: The existing and proposed lots lines have been added to sheet 2.
3. TP-5 was not depicted on the design plan (310 CMR 15.220(4)(h)).
Response: TP-5 has been added to the design plan (sheet 1).
/ 4. The percolation test results should indicate a percolation rate of<2 mins/inch.
Response: The less than symbol has been added to the percolation rates.
5. On sheet 1 of 3, the graphical representation of the test pits should be shown as they were excavated instead of circles as
depicted in the site plan view.
Response: The rectangular test pit symbols have been added to the plan.
6. Indicate why the soil absorption ystem cannot be proposed greater than 100 feet from the wetland resource area and
maintain compliance with section 3.9 of the North Andover regulation. There is an area in the southeast corner of the
proposed lot that isgreater than 100 feet from the wetland resource area.
Response: Considering the required setbacks from the property lines and the required size of
the proposed septic system, the area outside the 100 foot wetland buffer zone in the
southeast corner of the lot is insufficient to contain the system.
7. No benchmarks were depicted on the design plan(310 CMR 220(4)(q)).
41607 Response Letter re Lot 1 SSDS Comments 2016-06-15.docx
JN: 41607
y Mr. Brian LaGrasse
July 7, 2016
Page 2 of 2
absorption system shall be provided between the septic tank and soil absorption
system." With the varying lengths of the trenches as shown on the sketch, the
trenches will not receive equal distribution per linear feet of trench.
5. The wetland lines have not been confirmed or approved by the North Andover Conservation Commission and may be subject
to change.A preliminary site walk by the Conservation Department may be beneficial and reduce additional revisions.
Response: The variance requested is required to file with the Conservation Commission. The
Notice of Intent filing will verify the wetland lines.
6. To ensure compliance with 310 CMR 15.211,please add a note stating that there is no septic system on the easterly
abutting proper y (Map 105.C Block 0040)within 100'of the proposed well or increase the area depicted on the plan and
add 100'circumference around the subject well.
Response: A 100 foot arc centered on the proposed well was added as requested.
7. On sheet 3 of 3, remove the "untreated building paper"above the peastone layer in the soil absorption system. You may
change this and use permeable landscaping fabric. The use of the untreated building paper is not in compliance with Title 5
regulations and will deteriorate rapidly once installed This does not appear to accomplish the intended outcome stated inyour
letter dated June 15,2016.
Response: The "untreated building paper" has been removed from the detail.
8. Please submit an additional review fee of s 125 with revised plans.
Response: The additional fee accompanies this letter.
I believe all you concerns have been addressed. Should you have any question or require
additional information,please do not hesitate to contact me.
Yours truly,
DK ENGINEERING ASSOCIATES,INC.
Daniel Koravos, P.E.
President
cc: Mr. William MacLeod,Andover Consultants, Inc.
DK ENGINEERING ASSOCIATES, INC.
JN: 41607