HomeMy WebLinkAboutAgenda 04_SD-21-06_550 Park Road_Blackrock_FP
575 Dorset Street South Burlington, VT 05403 tel 802.846.4106 fax 802.846.4101 www.sburl.com
TO: South Burlington Development Review Board
FROM: Marla Keene, Development Review Planner
SUBJECT: SD-21-06 550 Park Road Final Plat Application
DATE: May 4, 2021 Development Review Board meeting
Blackrock Construction has submitted final plat application #SD-21-06 for the 6.91-acre “Wheeler Parcel” phase
of a previously approved master plan for a 450-acre Golf Course and 354-unit residential development. The
planned unit development consists of establishing three lots for the purpose of constructing a public road, 22
dwelling units in two-family homes, and 10 units in single-family homes, 550 Park Road.
The Board began review of the application on March 3, 2021 and continued the hearing to April 6 and May 4.
Two outstanding topics remained to be discussed after the May 4 meeting. These Staff comments omit
applicable LDR criteria for which Staff considers the Board has indicated they have taken sufficient testimony to
issue a decision. As always, the Board is encouraged to bring up any applicable elements of the LDR about
which they have ongoing or new concerns.
Staff reminds the Board, the applicant, and potentially interested persons, that the Board’s responsibility under
24 VSA §4417 is defined as follows:
(f) The approval of a proposed planned unit development shall be based on findings by the
appropriate municipal panel that the proposed planned unit development is in conformance with the
municipal plan and satisfies other requirements of the bylaws.
Further, the Board is obligated by 24 VSA §4461 to follow its own adopted rules of procedure.
Comments for the Board’s attention are in red.
Architecture
The applicable regulations pertaining to the appearance of the homes are as follows.
14.07 C. Relationship of Structures and Site to Adjoining Area.
(1) The Development Review Board shall encourage the use of a combination of common
materials and architectural characteristics (e.g., rhythm, color, texture, form or detailing),
landscaping, buffers, screens and visual interruptions to create attractive transitions between
buildings of different architectural styles.
(2) Proposed structures shall be related harmoniously to themselves, the terrain and to existing
buildings and roads in the vicinity that have a visual relationship to the proposed structures.
9.08C Residential Design
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(2) Building Façades. Building facades are encouraged to employ a theme and variation approach.
Buildings should include common elements to appear unified, but façades should be varied from
one building to the next to avoid monotony. Front porches, stoops, and balconies that create semi-
private space and are oriented to the street are encouraged. In the SEQ-NRN sub-district,
residential buildings with rear facades that orient towards a public recreation path should employ
rear porches, balconies, or other features to enhance their architectural detail.
(4)(d) Mix of Housing Styles. A mix of housing styles (i.e. ranch, cape cod, colonial, etc.), sizes, and
affordability is encouraged within neighborhoods and developments. These should be mixed within
blocks, along the street and within neighborhoods rather than compartmentalized into sections of
near-identical units.
(i) Mix of Housing Styles, SEQ-NRN sub-district. A minimum of at least three (3) housing styles
(i.e. ranch, cape cod, colonial, etc.), sizes, and/or affordability is required within neighborhoods
and developments. These should be mixed within blocks, along the street and within
neighborhoods rather than compartmentalized into sections of near-identical housing styles. Where housing styles are repeated, different colors and/or materials shall be employed to enhance
variety.
At the April 6 hearing, the Board indicated they would deliberate on the project and provide additional
feedback to the applicant regarding their proposed architecture. The below information was provided from
Staff to the applicant at the direction of the Board on 4/21/2021
• The Board reviewed the “inner loop” duplex homes and notes that while the home type is attractive,
there is insufficient variation between homes and recommends you enhance the variability.
• Regarding home types “Middlebury” and “Pico”
a. The front is ok. The window patterns are ok, and having eave returns is good. The Board
recommends making the eave returns go all the way across and varying the siding above the
eaves as a variation between the two types.
• Regarding home type “Stowe”
a. There needs to be more variation in the design on the back side. The Board is opposed to the
windows all being the same, and the four like windows being repeated at the exact same
spacing. The roof line on the rear needs to be broken up. The Board recommends considering
smaller “doghouse” dormers.
b. On the front, the differing roof shape is good, and the interest added by the garage windows is
good.
c. There should be design details added in the gables in either end. Should not be a field of
siding. Could add a decorative vent and switch siding direction
• Regarding home type “Woodstock”
a. On the rear, the same comments regarding the center windows apply
b. The right side of the rear has a better feel, but still needs more interest. On the left, the porch is
somewhat domineering. Can it be softened?
c. On the front, the windows in the gables are good-ish but should be a different shape – round or
arched.
• Finally, the Board thinks there is some potential if you switched “Stowe” and “Woodstock” to two single
family homes each, keeping the unit count the same. This is something for you to consider, not
necessarily something the Board is directing you to do.
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The applicant has provided a number of revised architectural plans responsive to this feedback. Full
architectural drawings are included in the packet. The following pages present some side by side comparisons
in order for the Board to evaluate the homes.
1. Staff recommends the Board re-familiarize themselves with the related applicable criteria, excerpted above,
and then determine whether the proposed elevations generally meet the applicable criteria.
2. Staff calls the Board’s attention to the following three specific elements of the revised home designs.
a. Elevations facing Dorset Street – The applicant has made significant modifications in the facades
facing Dorset Street, and has appreciably enhanced the variability of homes.
Staff recommends the Board require the applicant to add two windows spaced at greater than 3-feet
apart in each of the second stories of units “Maple” and “Oak.”
Staff also recommends the Board provide a vertical break in the siding of unit type “Pico” at the point
between the two units, which would allow the units to repaint and replace siding separately in the
future. Otherwise, Staff considers the proposed homes meet the SEQ-NRN requirements of 9.08C(2).
b. Homes on Interior Loop – the applicant has swapped out some of the previously proposed identical
duplexes and now there are five identical duplexes and four single family homes. While Staff still has
some concern about compliance with the requirement to avoid monotony and
compartmentalization, Staff considers this to be an improvement compared to the previous
proposal. The applicant indicated verbally to staff that some of the proposed homes are targeting a
lower price point. Staff considers that the provided units meet the requirements of 18.01D(2)
pertaining to inclusionary units being integrated into the overall project layout. In fact, Staff cannot
distinguish which units may be at a lower price point.
Staff considers the Board may wish to ask the applicant to commit to meeting the affordability
requirements of 18.01D, including that the maximum cost be affordable to households earning 80%
of the Area Median Income, and that the units be deed restricted to remain affordable in perpetuity,
as a way to compensate for the homes not being fully compliant with the above criteria. As a point
of reference, 80% of the Area Median Income for Chittenden County in 2021 for a family of four is
$76,700. The maximum monthly cost of ownership for that same family would be around $1,918.
c. Staff also recommends the Board consider requiring the applicant to make the homes solar-ready,
including the design of locations of roof penetrations, as an enhancement to the project.
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Ledge Removal
On April 6, the Board invoked technical review of the applicant’s proposed plan for removal of ledge. That
technical review was completed on May 4 and provided to the applicant, and is included in the packet for the
Board. The technical review made several recommendations, which the applicant responded to in a revised
blasting plan and response memo on 5/20/2021.
The technical review, the applicant’s response letter, and the revised blast plan, truncated to omit boilerplate
information, are included in the packet for the Board.
Staff asked the following clarifying questions of the technical reviewer, slightly rephrased for syntax.
Q1: The comment regarding seismograph locations has been addressed, but staff is dissatisfied with
reporting. Staff considers they must provide daily reporting to the City Zoning Administrator, and not simply
provide daily reports to the owner upon request. It also doesn’t seem their blast report form includes a place to
report the PPV, decibels or air blast overpressure, and either a supplemental template should be provided or
their template should be modified to include this information.
A1: It seems perfectly reasonable for you to require Black Rock or MD&B to send the blasting reports on a daily
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basis to City Zoning Administrator. The blast report template does include the PPV and dB measured at each
seismograph. It’s at the bottom of the first page. dB is the measurement of air blast overpressure.
Q2: The applicant indicated to Staff that MD&B was uncomfortable with the lower peak particle velocity
because of the increased time required to complete the work. What does it mean for them to “review air blast
and vibrations on a shot-by-shot basis and adjust blasting loads appropriately to maintain industry
standards”? Where is PPV measured relative to the blast?
A2: It means they will reduce the blasting loads if the measured PPV and/or dB exceeds what they consider to be
industry standards which is a PPV of 2.0 inches per second and an air blast overpressure of 133 dB. That is
reasonable for this project, but they should be required to reduce blasting loads to achieve lower PPV’s and dB if
directed to do so by the City Zoning Administrator as the project progresses. I would only anticipate that being
the case if the City receives an unusual number of complaints during the blasting operation. PVV and dB are
measured at the seismographs. Note that MD&B has indicated that their initial blast design predicts on PPV of
0.26 inches per second at the seismographs, which is very low. A PPV of 2.0 inches per second and an air blast
overpressure of 133 dB are the typical limits for most blasting operations. Lower PPV’s are sometimes specified
when there are historic, weak, or damaged structures near the blasting.
Q3: Similarly, what does it mean for them to “make adjustments to blast design if airblast decibels are on the
high end of the limits”? What is the “high end,” and where are the decibels measured?
A3: Answered in 2 above.
Q4: Staff would recommend the Board consider loosening up on the timing of the blasts but doesn’t believe they
should be given free reign between 7 and 5. How long does it take them to set up for the day and clean up after
they’re done? Is it reasonable to limit blasting to 9-3? 8-4?
A4: 8-4 seems reasonable, but this is really between the City and the Contractor. I recommend asking MD&B
how long it takes for them to set up and clean up each day.
Q5: Of the technical review’s recommendations for the 1000-ft radius, Staff considers it good practice to do
items a, c, and e for all the homes with 1000-ft, which all pertain to an initial outreach effort and could be done
by mail. Staff can appreciate how items b and d could be difficult within a more densely populated area.
A5: 250’ is probably sufficient for most blasting. I recommended 1000’ for this project for the following reasons:
a. There are no structures within the 250’ radius according to the MD&B map. 1000’ will include all the
residences in the two nearby small developments.
b. There seems to be a significant concern about this project and one of the best and easiest ways to
alleviate concern is communication.
c. The proximity of the emergency communications tower and the water storage tower.
Yes, recommendations b. (offer a pre-blast survey) and d. (offer to call 1 hour prior to each blast) would be more
difficult in a more densely populated area. As I said, my recommendation of 1000’ radius was specifically for
this project. Recommendation b. protects the contractor as much as the resident. It eliminates claims of
damage after the blasting that was identified as existing damage prior to the blasting.
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13.16C. Conditions of Approval. The Development Review Board, in granting its approval, may impose
conditions on the following:
(1) Duration of the permit for any length of time that the Development Review Board deems
appropriate.
The applicant provided the following response:
The project will require a zoning permit for infrastructure from the City of South Burlington. The zoning
permit will be closed once the public infrastructure passes all construction tests and passes the required
2-year warranty period to the satisfaction of the City Public Works Department.
3. Staff considers the applicant’s response to be irrelevant to the purpose of the standard and
recommends the Board limit the disturbance related to ledge removal to three months, which is greater
than the time estimated by Maine Drilling and Blasting at the April 6th meeting of 1-2 months.
(2) Submission of an acceptable plan for the rehabilitation of the site at the conclusion of the
operations, including grading, seeding and planting, fencing, drainage, and other appropriate
measures.
The applicant provided the following response:
Please refer to the project site plans. As the project is part of a development project, the “reclamation
plan” in this case is essentially the site plan.
Staff supports the applicant’s proposal to not provide additional rehabilitation plans.
(3) Hours of operation, routes of transportation, and amount of material to be removed.
The applicant provided the following response:
The typical construction hours for a project under Act 250 jurisdiction is 7:00 AM – 7:00 PM Monday
through Friday and 8:00 AM – 5:00 PM on Saturday with no construction on Sundays or Holidays. All
construction traffic will access the project from Dorset Street.
4. The applicant indicated their working hours would be 8AM to 5PM. As recommended by the technical
reviewer, Staff recommends the Board ask the applicant to indicate how long set up and clean up will
take, and recommends the Board limit blasts to two blasts per day to a shorter period than 8AM to
5PM.
More information pertaining to routes of transportation and road closure information is detailed in the
information provided by MD&B. Staff recommends the Board adopt MD&Bs proposed traffic
management strategy described in their letter of 5/14/2021:
Traffic will be stopped 1 minute prior to blast, and will be stopped for a 2- minute window, or until the
blast scene is deemed safe by the [Blaster in charge]. Full communication will be ongoing between
traffic control and MD&B via two-way radios.
Traffic stop locations are shown in the blasting plan.
Amount of material to be removed should be as shown on the Preblast Survey Drawing updated on
5/21/2021.
(4) Provision of a suitable bond or other security in accordance with Section 15.15 adequate to assure
compliance with the provisions of these Regulations.
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The applicant provided the following response:
The project will require a zoning permit from the City of South Burlington. As part of the infrastructure
zoning permit issuance, an estimate will be submitted by a qualified site contractor for the construction
of the public infrastructure improvements. A bond will be posted by the Applicant for the
improvements. Typically, a 10% retainage is kept until the roadway passes the 2-year warranty
period.
The applicant will be required to bond for road construction. If the project unexpectedly fails to
progress, the City can use the roadway bond to restore the site to a safe condition.
Recommendation
Staff recommends the Board discuss the project with the applicant and close the hearing.
Respectfully submitted,
Marla Keene, Development Review Planner
PO Box 1146 l Williston, VT 05495 l Tel: 802-879-6343 l Fax: 802-879-6376 l kcevt.com
Memorandum
To: Marla Keene, PE, Development Review Planner, City of South Burlinton
From: Martin Hain, PE
Date: May 4, 2021
Proj: Wheeler Project Blasting Plan Review
Noise
o LDR App A, Section A.3 – As far as I can see there are no specific noise requirements
applicable to blasting operations.
o The audible noise from blasting is typically between 80 and 100 decibels (dB). It is brief.
o Typical dB levels
150 dB – Fighter jet takeoff
145 dB ‐ Fireworks
125 dB – Jack Hammer
120 dB – F35 Jet in flight
105 dB – Jack hammer
80 dB – Heavy traffic, noisy restaurant
o It is my professional opinion that the noise of blasting will not be objectionable to most
people particularly if they are well informed as to when the blasting will occur. In my
opinion the noise of backhoe mounted jack hammers being used to remove ledge would
be more objectionable.
Vibration
o LDR App A, Section A.2 ‐ I believe blasting would be classified as “single impulse random
vibration” as defined in section A.2(b). This section indicates that vibrations due to
single impulse sources shall not exceed 0.01g. 0.01g is equal to 3.86 in/sec2.
o Blasting vibrations are measured by peak particle velocity (PPV). There is no direct
correlation between acceleration and PPV. I have found some research documents that
indicate a PPV of 1 in/sec is approximately equivalent to an acceleration of 13 in/sec2.
o The letter from Maine Drilling & Blasting (MD&B) dated 3/15/21 says they will limit PPV
to 2.0 in/sec at the nearest “structures/utilities/residence”. This is a common limiting
value used for blasting operations, although lower limits such as 0.5 in/sec are often
used for sensitive structures. A PPV of 2 in/sec is roughly equivalent to an acceleration
of 25 in/sec2. A PPV of 0.5 in/sec is roughly equivalent to an acceleration of 6.25 in/sec2.
o PPV is significantly impacted by the distance from the blast and the size of the blast.
o The requirement in LDR App A seems unreasonably low. I would suggest that MD&B be
allowed to use the limiting PPV of 2 in/sec with the understanding that they will adjust
their blasting load as necessary to achieve a limiting PPV of 0.5 in/sec if neighbors
expressed concern about the level of vibration caused by the blasting operations.
o If a lower limit on PPV is imposed it might increase the cost and length of the projects as
well as the number of blasts.
Page 2
Date: May 4, 2021
Re: Wheeler Project Blasting Plan Review
o Vibration in houses can also be caused by air blast overpressure. The MD&B Blasting
Plan (p. 5) indicates that they will limit air blast overpressure to 133 dB. This is a
common limit for blasting operations. An air blast overpressure of 133 dB can cause
rattling inside houses, but typically does not cause any damage. The MD&B Blasting
Plan does not indicate how they intend to measure and document air blast
overpressure. MD&B should indicate how they will measure air blast overpressure and
what actions they will take if air blast overpressure exceeds 133 dB.
o 133 dB is larger than the typical noise dB listed earlier. It is my understanding that these
larger dB levels for air blast overpressure are at a frequency below the human hearing
threshold of 20 Hertz. People will hear the blast, but the audible dB will probably be
between 80 and 100 dB.
Schedule
o The MD&B Blasting Plan (p. 3) indicates that blasting will occur between 7:00am and
5:00pm on weekdays (Mon‐Fri).
o The Town can impose a stricter schedule if it desires. A stricter schedule may increase
the length and cost of the project.
Notifications
o Warning signals for each blast are listed in p. 4 of the Blasting Plan. I suspect the signal
will be an air horn, but you may want to ask MD&B what the signal will be.
3 signal pulses – 5 minutes to blast
2 signal pulses – 1 minute to blast
1 signal pulse – all clear
o In a letter from MD&B dated 4/20/21 they offered to make a one hour pre‐blast call to
“adjacent homeowners, first responders, etc.”.
My recommendations to the Board:
1. Require the Contractor to indicate exactly how many seismographs will be used and where they
will be located. I think two might be appropriate, one at the nearest residence on Nicklaus Cir
and another at the nearest residence on Folsham Hollow Rd.
2. Allow a PPV of 2 in/sec but require the Contractor to be prepared to reduce blasting loads as
necessary to achieve PPV of 1 or 0.5 in/sec if the Town feels this is necessary due to input from
the community after blasting operations commence.
3. Require the Contractor to indicate how air‐blast overpressure will be measured and reported.
Air‐blast overpressure should be limited to 133 dB as indicated in the Blasting Plan.
4. Require the Contractor to provide daily blast reports for each blast to the Zoning Administrator
by the end of each day blasting occurs. Blasting reports should indicate the PPV and air‐blast
overpressure at each seismograph location.
5. Propose or require a more restrictive blasting schedule such as one blast between 9 and 11 and
one blast between 1 and 3.
Page 3
Date: May 4, 2021
Re: Wheeler Project Blasting Plan Review
6. Require the Contractor to provide information regarding how traffic will be impacted during
blasting.
7. Require the Contractor to contact owners of all properties within 1000’ of the blasting including
the CWD water tower and the communications tower to:
a. Inform them about the upcoming blasting operation,
b. Offer to conduct a pre‐blast survey to identify existing damage,
c. Inform them of the impacts to traffic,
d. Offer to call them 1 hour prior to each blast,
e. Inform them of the pre‐blast and post‐blast signals, and
f. Provide them with a point of contact where they can address their questions and
concerns.
File: Wheeler Project KCE Findings and Recommendations.docx
Maine Drilling & Blasting, Inc. Divisional Offices
88 Gold Ledge Avenue Connecticut 860.242.7419
Auburn, NH 03032 Maine 207.582.2338
603.647.0299 Massachusetts/RI 508.478.0273
603.647.9770 FAX New Hampshire 603.647.0299
New York 518.632.9170
Pennsylvania 800.422.4927
Vermont 802.479.3341
Setting Earth-Shattering Standards Since 1966 • An Equal Opportunity Employer
From: Cole Dube Date: May 14, 2021
Field Engineer
Subject: Wheeler Parcel – Blasting Plan
Maine Drilling and Blasting
To: Ben Avery
Black Rock Construction
In response to a review by Knights Consulting Engineers, Inc. of the original submitted blast plan,
MD&B has prepared the following comments in addition to the revised blast plan as additional
clarification.
Comments:
COMMENT:Require the Contractor to indicate exactly how many seismographs will be used and where
they will be located. I think two might be appropriate, one at the nearest residence on Nicklaus Cir
and another at the nearest residence on Folsham Hollow Rd.
A revised pre-blast drawing has been included in the blast plan that signifies seismograph locations.
MD&B plans to use 2 seismographs for every blast.
COMMENT: Allow a PPV of 2 in/sec but require the Contractor to be prepared to reduce blasting loads as
necessary to achieve PPV of 1 or 0.5 in/sec if the Town feels this is necessary due to input from
the community after blasting operations commence.
MD&B’s blasts are designed to stay within the industry standard PPV of 2 in/sec. The nearest structure to
the blast zone is approximately 290’ from the closest blast area. Our initial blast design indicates an
estimated 0.26 PPV at the nearest structure. MD&B will review air blast and vibrations on a shot-by-shot
bases and will adjust blasting loads appropriately to maintain industry standards.
COMMENT: Require the Contractor to indicate how air blast overpressure will be measured and reported.
Air‐blast overpressure should be limited to 133 dB as indicated in the Blasting Plan.
Air-Blast will be measured by MD&B seismographs at each location depicted in the pre-blast drawing
included in the blast plan. Air-blast results from each blast will be included in the shot report which shall
be available to Black Rock Construction upon request for each blast. MD&B will make adjustments to
blast design if airblast decibals are on the high end of the limits.
Setting Earth-Shattering Standards Since 1966
COMMENT:
Require the Contractor to provide daily blast reports for each blast to the Zoning Administrator
by the end of each day blasting occurs. Blasting reports should indicate the PPV and air‐blast
overpressure at each seismograph location.
Blast reports shall be provided for each blast to Black Rock Construction. Black Rock Construction shall
provide each report as specified. Please refer to the blast plan for MD&B Shot Report Template.
COMMENT:
Propose or require a more restrictive blasting schedule such as one blast between 9 and 11 and
one blast between 1 and 3.
Blasting on the Wheeler Parcel shall have a minimal impact on neighbors and passing traffic. All pre-blast
procedures shall be followed as written in the blast plan. MD&B initially anticipates blasting twice per day
once mid-morning and once midafternoon. Due to unforeseen conditions (storms, breakdowns, etc)
MD&B will not be able to provide an hourly schedule. Once MD&B dials in blast design for project we
will develop a more accurate schedule. MD&B will compile a call list including all determined to be
notified 1 hour before each blast.
COMMENT: Require the Contractor to provide information regarding how traffic will be impacted during
blasting.
MD&B expects minimal traffic impact throughout the project. Please see the revised Pre-Blast Drawing
included in the blast plan that indicates traffic stop points that will be used when deemed by the BIC to stop
traffic for the public safety. Black Rock is responsible for traffic stoppages which will be coordinated with
MD&B. It is anticipated that traffic will be stopped 1 minute prior to blast, and will be stopped for a 2-5
minute window, or until the blast scene is deemed safe by the BIC. Full communication will be ongoing
between traffic control and MD&B via two-way radios.
COMMENT:
Require the Contractor to contact owners of all properties within 1000’ of the blasting including
the CWD water tower and the communications tower to:
MD&B will follow the industry standard 250’ pre-blast radius which is also the radius required by the City
of South Burlington. MD&B has successfully completed numerous projects in South Burlington at the
standard 250ft pre-blast radius. Some recent projects include the following: O’Brien Home Farm, Garden
Street South Segment, South Village Phase 3B, Quarry Hill Subdivision.
a. Inform them about the upcoming blasting operation,
Please see the blast plan for our pre-blast procedures. MD&B will generate a call list of surrounding
residences provided by Black Rock. All residences that wish to be on the call list within the pre-blast
radius will have notification 1 hour before each blast.
b. Offer to conduct a pre‐blast survey to identify existing damage,
Please see the blast plan for our pre-blast procedures. A pre-blast survey shall be offered to all residences
within the pre-blast radius. Results of the survey will be documented and a series of still photographs and
videos will be taken upon owners approval.
c. Inform them of the impacts to traffic,
Setting Earth-Shattering Standards Since 1966
Please see the blast plan for our pre-blast procedures. Traffic will be halted when deemed by the BIC to
stop traffic for the public safety. Black Rock is responsible for traffic stoppages which will be coordinated
with MD&B. It is anticipated that traffic will be stopped 1 minute prior to blast, and will be stopped for a
2-5 minute window, or until the blast scene is deemed safe by the BIC. Full communication will be
ongoing between traffic control and MD&B via two-way radios.
d. Offer to call them 1 hour prior to each blast,
Each residence who accepts to be on the call list within the pre-blast radius shall be added along with
additional residence request from Black Bock and first responders. The call list shall be notified 1 hour
before each blast
e. Inform them of the pre-blast and post blast signals, and provide them with a point of contact where
they can address their questions and concern.
Each residence within the pre-blast radius will receive information on our blasting procedures including
signal whistles. Additional residence requested by Black Rock shall be given the same information.
MD&B will provide important blasting info to Black Rock to distribute to anyone who desires. The point
of contact for any additional questions shall be Benjamin Avery who can then direct information to
MD&B.
Cole Dube
Field Engineer
___________________________________
Blasting Plan
For
Wheeler Parcel
_____________________________________ South Burlington, Vermont 05403 February 18, 2021
Prepared By: Maine Drilling & Blasting, Inc Western Construction 7190 State Route 40
Argyle, NY 12809 Telephone: 518 824-3309 Fax: 518 632 5716
Joe Happy / Cole Dube Assistant Division Manager / Field Engineer
___________________________________________ ___________________________________________ Name Title 1
Table of Contents
General
Pre-Blast Surveys
Blast Monitoring
Sequence of Blasting
Blasting Procedures
Blasting Mats
Blast Area Security and Warning Signals
Explosives
Blaster Qualifications
Blasting Personnel
Licenses and Permits
Blast Vibration
Blast Reports
Typical Blast Design
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General
Maine Drilling & Blasting, Inc. considers safety as the priority during all phases of blasting operations. We are
knowledgeable of and will follow all local, state and federal regulations related to transportation and use of explosives.
The project specifications and conditions have been reviewed. Details of procedures for pre-blast surveys, explosives
use, blast security, monitoring and documentation are enclosed.
Pre-Blast Surveys / Notifications Pre-blast surveys will be offered to all property owners within 250 foot radius of the blast site. Appropriate notices will be
given and appointments arranged for those owners who desire a survey. Pre-blast surveys will be conducted by a
Company Representative. Results of those surveys will be documented through video or still photographs and appropriate narration or written reports.
Blast Monitoring
All blasts will be monitored by a representative of Maine Drilling & Blasting, Inc. who has been properly trained in the
setup and use of seismic monitoring equipment. At least one seismograph will be in use at all times. Placement of
monitoring equipment will be at the nearest structure to the blast site. Maine Drilling & Blasting, Inc monitoring equipment
will consist of Instantel type seismographs. Details are enclosed. Results of blast monitoring will typically be available
before the next blast, usually immediately following a blast. Results can be reviewed and modifications can be made to
the blast design for the next blast if necessary.
Sequence of Blasting All blasting operations will be strictly coordinated with CONTRACTOR, engineers, and Fire Department. Emphasis will
be on the safe and efficient removal of the rock existing on this project without impact to surrounding structures. Blasts
will be developed so as to create adequate relief which will minimize ground vibrations and offer the greatest protection
possible to the surrounding structures.
Blasting Procedures
1. Blasting operations shall commence after 7:00 AM and cease before 5:00 PM, Monday through Friday.
2. Blasting cannot be conducted at times different from those announced in the blasting schedule except in emergency situations, such as electrical storms or public safety required unscheduled detonation.
3. Warning and all-clear signals of different character that are audible within a range of one-quarter mile from the point of the blast shall be given. All persons within the permit area shall be notified of the meaning of the signals through
appropriate instructions and signs posted.
4. Access to blasting area shall be regulated to protect the public from the effects of blasting. Access to the blasting are
shall be controlled to prevent unauthorized entry before each blast and until the perimeter's authorized representative has
determined that no unusual circumstances exist after the blast. Access to and travel in or through the area can then safely
resume.
5. Areas in which charged holes are awaiting firing shall be guarded, barricaded and posted, or flagged against unauthorized entry.
6. All blasts shall be made in the direction of the stress relieved face previously marked out or previously blasted.
7. All stemming shall be minimum as specified using clean, dry 3/8'' crushed stone.
3
8. Blasting mats shall be used as necessary to cover blasts.
9. The Blasting Contractor shall insure that extra safety and judgment is exercised by his blaster to prevent the
simultaneous blasting of numerous holes.
Blasting Mats
Blasting mats and backfill will be used to control excessive amounts of rock movement when blasting in close proximity to
structures. Placement and number of mats are typically determined by the blaster. Mats will be placed so as to protect all
people and structures on, or surrounding the blast site and property. Rubber tire type blasting mats will be utilized on this
project and will be approximately 12' x 24' in size; Rubber mat @ 12' x 24' 38 lbs./s.f. = 10,944 lbs./ea.
Blast Security and Warning Whistles
Each blast will be preceded by a security check of the affected area and then a series of warning whistles.
Communications will be made with job site supervisors and local officials as required to ensure the safest possible
operation. All personnel in the vicinity closest to the blast area will be warned. The warning whistles will follow the
following sequence:
3 Audible Signal Pulses - 5 Minutes to Blast
2 Audible Signal Pulses - 1 Minute to Blast
1 Audible Signal Pulses - All Clear
No blast will be fired until the area has been secured and determined safe. The blast site will be examined by the blaster prior to the all-clear signal to determine that it is safe to resume work.
Explosives All explosives will be delivered to the job site on a daily basis. Overnight storage will be a licensed secure magazine site
only the amount of explosives required to perform the day's work will be brought to the site. All explosives will be stored
in approved magazines when not in use.
Enclosed are Technical Data and SDS sheets for the explosive products proposed for use on this project. Any one of, or a combination of these products may be in use at any one time on the site.
Blaster Qualifications All Maine Drilling & Blasting, Inc. blasters on this job will be licensed in the State of Vermont and have received various
amounts of training in the safe use and handling of explosives. Additionally, Maine Drilling & Blasting, Inc. blasters are
familiar with all OSHA Regulations, State Regulations, and Federal Regulations regarding construction site safety,
including transportation, use, and handling of explosive materials. Weekly safety meetings are to be held on site by the
Maine Drilling & Blasting, Inc. job foreman, with a record of that meeting returned to the Maine Drilling & Blasting, Inc.
office.
4
Blasting Personnel
All blasting operations shall be conducted by experienced, trained and competent persons who understand the hazards involved. Persons working with explosive materials shall:
1. Have demonstrated knowledge of, and a willingness to comply with, safety and security requirements.
2. Be capable of using mature judgment in all situations.
3. Be of good physical condition and not addicted to intoxicants, narcotics, or other similar type of drugs.
4. The person(s) responsible for the explosives shall possess current knowledge of the local, State and Federal laws and regulations applicable to his work.
5. The person(s) responsible for the explosives shall have obtained a Certificate of Competency or a license as required
by State law.
Licenses and Permits Maine Drilling & Blasting, Inc. is fully licensed and insured for the transportation, use, and handling of explosives.
Evidence of insurance is available. Blasting permits will be applied for as required from the local authorities by the Maine
Drilling & Blasting, Inc. Blaster/Foreman when blasting is about to begin.
Blast Vibration
Blast vibration will be monitored at the blast site, typically at the structure(s) closet to the blast site. Vibration limits will
closely follow industry limits and the State and Local Regulations. Blast designs will be modified as required to stay within
the guidelines and meet project schedules as well. Blasting operations will be modified accordingly when approaching
buildings and utilities. Enclosed are preliminary vibration calculations based on known distances to the structures of
concern and anticipated initial blast designs.
Ground vibration peak particle velocity limits shall not exceed USBM Alternative Blasting Criteria * US Bureau of Mines (USBM) RI 8507 Appendix B * Standard, and applicable State Regulations (VOSHA related to blasting, N.F.P.A. No. 295)
Airblast overpressure level not to exceed 133 peak dB (linear) two Hertz high -pass system.
Blast Reports Enclosed is a sample of a Maine Drilling & Blasting, Inc Blast Report. This report will be filled out for each blast and
copies supplied as needed.
Typical Blast Design
Enclosed are what would be considered typical blast designs for this project. Hole sizes, depths, spacing and loading
information is provided. These designs are to be considered a good starting point. Modifications are usually made, if necessary, following the first blasts to meet control and seismic considerations. 5
Sample Blast Report
Blast Report
Job # _________________ Customer Name: ______________________________ Customer Supt. : ______________________
Date: _________________ Job Address: _________________________________ Pick Ticket(s) # : ______________________
Shot #: _________ _________ _________ _________ Fire Detail Hours:__________________
Shot Time:Type of Rock:__________________
Operation: (Trench, Open) Type of Terrain:__________________
Weather Conditions:__________________
# Holes:Wind Direction/Speed:__________________
Depth of Water: Identify Hazards: _____________________
Hole Diameter:
Burden:_____________________________________
Spacing:
Total Square Feet: Precautions Taken: ___________________
Stemming:
Sub Drill:_____________________________________
Avg. Drill Depth: Calculations:
Total Drill Footage:
Total Pay Yards:
Total Yards Shot:
Bulk __________________
ANFO
ANFO WR
Exp. 1 ________________
Exp. 2 ________________
Exp. 3 ________________
Exp. 4 ________________
Cast Booster ___________
Cast Booster ___________
Total Pounds Shot:
Powder Factor (Lbs / Cyd):
Det 1 _________________
Det 2 _________________
Det 3 _________________
Det 4 _________________
Det 5 _________________ Notes:
Det 6 _________________
Lead Line ____________
Type of Cover (Dirt, Mats):
# of Mats Used:
Seis #: PPV:
Operator: dB:
Location:
Seis #: PPV:
Operator: dB:
Location:
Seis #: PPV:
Operator: dB: Blaster
Location:Name: ______________________________
Seis #: PPV:
Operator: dB: Lic. # _________________
Location:
Signature:Signature: ___________________________
THIS REPORT MUST BE FILLED OUT COMPLETELY Rev. 5-5-08
Blast Design Plan
Show Timing for Each Shot
Job Number: Date:
Typical Columns
FORMULAS:
SD = D / W ^.5
PPV = K x (SD)^-1.6
K = PPV x SD ^1.6
Shot #: _________ _________ _________ _________
Distance to Closest Structure:
Location of Structure:
Max Holes Per Delay:
Max Pounds Per Delay:
Scale Distance:
Predicted PPV: K Factor __________
THIS REPORT MUST BE FILLED OUT COMPLETELY Rev. 5-5-08
Blasting Location Sketch
DESCRIPTIONDATEREV
Park Road
South Burlington, VT
PARK ROADPreblastSurveyDrawing 250ft PREBLASTSURVEY RADIUS
‘
Maine Drilling & Blasting, Inc. Divisional Offices
7190 State Route 40 Connecticut 860.242.7419
Argyle, NY 12809 Maine 207.582.2338
518.632.9170 Massachusetts/RI 508-478-0273
518.632.5716 FAX New Hampshire 603.647.0299
New York 518.632.9170
Pennsylvania
717.866.8981
Vermont 802.453.5138
Setting Earth-Shattering Standards Since 1966 • An Equal Opportunity Employer
Subject: Daily Operations – Drilling & Blasting Date: April 20, 2021
The following information will outline a typical drill and blast day as expected by MD&B on the Wheeler Parcel
Subdivision Project. MD&B has completed various projects in South Burlington, VT very similar to the Wheeler Parcel
project and has great confidence in our daily procedures.
A Pre-Task Analysis (attached below) is completed at the beginning of each day by all MD&B personnel on site. Roles
and responsibilities are discussed as well as any possible safety concerns. Once a PTA is completed, drilling and
blasting operations will start for the day. Holes are laid out based on a blast design and pattern to achieve an
appropriate powder factor and will be drilled to depths specified by contractor. Explosives will be brought to the site
daily and kept in an approved portable magazine mounted on MD&B’s truck. Once the driller has drilled enough
holes to shoot, the blaster will load each hole with explosives and stemming stone. The shot will then be tied
together in a sequence for proper timing. After the shot is tied together the MD&B crew will walk the shot ensuring
every hole is stemmed, properly tied in, and any trash/debris is removed from the shot. Blasting mats will be placed
over the shot with assistance from the contractors excavator/operator. All unused explosives will be transported
offsite daily along with all MD&B’s empty boxes and garbage.
Once the shot is matted, all equipment will be moved to a safe distance from the blasting area and the MD&B crew
will set seismographs at the nearest structures to the blast along with a camera to capture video of each blast. A site
security plan is developed for each job to make sure no person gets within the blasting area. Each MD&B personnel
will take charge of a site security point and communicate via radio. The blaster will blow warning whistles prior to
blast (3 whistles – 5 minute warning), (2 whistles – 1 min warning) while maintaining communication with each site
security point. Once the 2 whistle warning is blown and each site security point is clear and deemed safe by the BIC,
the shot will then be fired. A final single whistle will be blown after the shot has been fired, and site security
removed. The blaster will walk the shot prior to the single whistle to make sure it has properly fired and the area
deemed safe. Immediately following the single whistle the contractor will remove the mats from the blasted rock and
vent the shot.
During operations, MD&B will remain in constant communication with the contractor and traffic control. A preblast
call will be offered 1 hour before each blast to adjacent homeowners, first responders, etc. who want to be on the call
list. MD&B plans to shoot multiple shots each day for the Wheeler Parcel Project. Each blast is specifically designed
to all State and Federal regulations. PTA, Drilling Logs, and Blast Reports are completed daily by MD&B.
Please do not hesitate to contact me with any questions.
Regards,
Joseph Happy
Assistant Divisional Manager
Maine Drilling & Blasting, Inc.
(203) 231-4118
Blast Report
Job # _________________ Customer Name: ______________________________ Customer Supt. : ______________________
Date: _________________ Job Address: _________________________________ Pick Ticket(s) # : ______________________
Shot #: _________ _________ _________ _________ Fire Detail Hours:__________________
Shot Time:Type of Rock:__________________
Operation: (Trench, Open) Type of Terrain:__________________
Weather Conditions:__________________
# Holes:Wind Direction/Speed:__________________
Depth of Water: Identify Hazards: _____________________
Hole Diameter:
Burden:_____________________________________
Spacing:
Total Square Feet: Precautions Taken: ___________________
Stemming:
Sub Drill:_____________________________________
Avg. Drill Depth: Calculations:
Total Drill Footage:
Total Pay Yards:
Total Yards Shot:
Bulk __________________
ANFO
ANFO WR
Exp. 1 ________________
Exp. 2 ________________
Exp. 3 ________________
Exp. 4 ________________
Cast Booster ___________
Cast Booster ___________
Total Pounds Shot:
Powder Factor (Lbs / Cyd):
Det 1 _________________
Det 2 _________________
Det 3 _________________
Det 4 _________________
Det 5 _________________ Notes:
Det 6 _________________
Lead Line ____________
Type of Cover (Dirt, Mats):
# of Mats Used:
Seis #: PPV:
Operator: dB:
Location:
Seis #: PPV:
Operator: dB:
Location:
Seis #: PPV:
Operator: dB: Blaster
Location:Name: ______________________________
Seis #: PPV:
Operator: dB: Lic. # _________________
Location:
Signature:Signature: ___________________________
THIS REPORT MUST BE FILLED OUT COMPLETELY Rev. 5-5-08
Blast Design Plan
Show Timing for Each Shot
Job Number: Date:
Typical Columns
FORMULAS:
SD = D / W ^.5
PPV = K x (SD)^-1.6
K = PPV x SD ^1.6
Shot #: _________ _________ _________ _________
Distance to Closest Structure:
Location of Structure:
Max Holes Per Delay:
Max Pounds Per Delay:
Scale Distance:
Predicted PPV: K Factor __________
THIS REPORT MUST BE FILLED OUT COMPLETELY Rev. 5-5-08
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First Floor0' -0"First Floor TP9' -1 1/8"Grade-1' -9 1/2"Top of Foundation-1' -1 1/2"Garage Slab-1' -5 1/2"9' - 1 1/8"1' - 1 1/2"3' - 0"8' - 3"TOW TO MIDPOINT OF ROOF14' - 9" +/-First Floor0' -0"First Floor TP9' -1 1/8"Grade-1' -9 1/2"Top of Foundation-1' -1 1/2"Garage Slab-1' -5 1/2"1' - 1 1/2"9' - 1 1/8"SCALE:DATE:DRAWN BY:CHECKED BY:PROJECT:SHEET TITLE:THIS DRAWING IS THE PROPERTY OF G4 DESIGN STUDIOS, LLC AND IS NOT TO BE COPIED, REPRODUCED, OR THE CONTENT THEREOF USED, IN WHOLE OR IN PART, WITHOUT THE PRIOR WRITTEN CONSENT OF STEVE GUILDFOR REVIEW ONLY NOT FOR CONSTRUCTION1/4" = 1'-0"5/19/2021 2:07:16 PMA-3.1EXTERIORELEVATIONSBLACKROCK CONSTRUCTIONDUPLEX #2SGWGI5/19/21PARK RDPARK ROAD1/4" = 1'-0"1FRONT ELEVATION1/4" = 1'-0"2REAR ELEVATION
First Floor0' -0"First Floor TP9' -1 1/8"Top of Foundation-1' -1 1/2"9' - 1 1/8"1' - 1 1/2"TOW TO MIDPOINT OF ROOF14' - 9" +/-First Floor0' -0"First Floor TP9' -1 1/8"Grade-1' -9 1/2"Top of Foundation-1' -1 1/2"SCALE:DATE:DRAWN BY:CHECKED BY:PROJECT:SHEET TITLE:THIS DRAWING IS THE PROPERTY OF G4 DESIGN STUDIOS, LLC AND IS NOT TO BE COPIED, REPRODUCED, OR THE CONTENT THEREOF USED, IN WHOLE OR IN PART, WITHOUT THE PRIOR WRITTEN CONSENT OF STEVE GUILDFOR REVIEW ONLY NOT FOR CONSTRUCTION1/4" = 1'-0"5/19/2021 2:07:24 PMA-3.2EXTERIORELEVATIONSBLACKROCK CONSTRUCTIONDUPLEX #2SGWGI5/19/21PARK RDPARK ROAD1/4" = 1'-0"1LEFT ELEVATION1/4" = 1'-0"2RIGHT ELEVATION