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City Of Seattle

Seattle Public Utilities

Specification For

South Park Pump Station PW# 2019-067

Addendum No. 2 February 27, 2020

To Plan holders:

The attached Addendum No. 2 modifies the Contract documents for South Park Pump Station.

Every Bidder shall acknowledge receipt of Addendum No. 2 by filling in the appropriate space in the Bid Form.

Mark Fredrickson, P.E. Public Works Contracts Supervisor SPU Project Controls Division

ADDENDA SECTION 00 91 13 SOUTH PARK PUMP STATION Page 1

1.02 ADDENDUM NO. 2 A. Addendum No. 2 for "South Park Pump Station" issued on February 27, 2020 modifies

the Contract documents. B. The Date of Bid Opening is not changed by this Addendum. C. Section 00 31 10 – Owner Furnished Project Information

1. Delete Article 1.13 and replace with the following: 1.13. Monitoring and Inadvertent Discovery Plan

A. The Monitoring and Inadvertent Discover Plan (MIDP) must be on the Project Site and followed for this project.

B. A copy of the MIDP is included at the end of this Section. 2. Add the MIDP, labeled “Addendum No. 2, Attachment 1” to the end of this

Section, after the Right of Entry for Machinists.

D. Section 00 31 43 – Permits Obtained by Owner

1. Delete this Section and replace it with the attached Section 00 31 43 labeled “Addendum No. 2, Attachment 2”.

Note: This Section was revised to remove the Shoreline Substantial Development

Permit since it is part of the Master Use Permit which has been obtained. E. Section 01 57 50 – Temporary Environmental Pollution Control 1. Delete Paragraph 1.10.D and replace with the following:

D. The Contractor shall also comply with the Monitoring and Inadvertent Discovery Plan (MIDP) as specified in Section 00 31 10 – Owner Furnished Project Information.

F. Section 31 09 13 – Geotechnical Instrumentation and Monitoring

1. Delete this Section and replace it with the attached Section 31 09 13 labeled “Addendum No. 2, Attachment 3”.

Note: This Section was revised to add information regarding shoring deformation

monitoring. G. Section 31 32 01 – Deep Soil Mixing 1. In the first sentence of Paragraph 3.04.D, replace the word “should” with “must”.

ADDENDA SECTION 00 91 13 SOUTH PARK PUMP STATION Page 2

H. Drawing Sheet E-09

1. In the Cable Tag column delete “C115-A”, “P115-A”, “C116-A”, and “P116-A” and replace with “C0115-A”, “P0115-A”, “C0116-A”, and “P0116-A”.

I. Drawing Sheet E-10

1. In the Cable From column, on the third row delete “PBD-0191” and replace with “MCC-0186”.

J. Attachments

1. Monitoring and Inadvertent Discovery Plan 2. Section 00 31 43 – Permits Obtained by Owner 3. Section 31 09 13 – Geotechnical Instrumentation and Monitoring

End of Addendum No. 2

Monitoring and Inadvertent Discovery Plan South Park Pump Station Project, Seattle, Washington

Addendum No. 2, Attachment 1

Monitoring and Inadvertent Discovery Plan South Park Pump Station, Seattle, Washington

January 2020 Cardno Document Information i

Document Information Document Name Monitoring and Inadvertent Discovery Plan for the South Park Pump Station

Project, Seattle, Washington

SPU Project Manager Shailee Sztern, P.E.

SPU Project Number C308011

NWS Permit Number NWS-2009-00529-WRD

DAHP Project Number 040408-06-KI

Cardno Principal Investigator Jennifer M. Ferris, MA, RPA

Date January 8, 2020

Prepared for:

Shailee Sztern, P.E. Heather Walker City of Seattle, Seattle Public Utilities 700 Fifth Avenue P.O. Box 34018 Seattle, Washington 98124-4018

Prepared by:

Emily Scott Jennifer M. Ferris, MA, RPA Cardno 801 2nd Avenue, Suite 1150 Seattle, Washington 98104



January 2020 Cardno ii

Table of Contents 1 Introduction ...................................................................................................................... 1

1.1 Regulatory Context .............................................................................................................. 1 1.2 Project Location and Description ......................................................................................... 2 1.3 Confidentiality ...................................................................................................................... 3

2 Monitoring Protocols ....................................................................................................... 6 2.1 Personnel Qualifications and Communication Requirements ............................................. 6 2.2 Consulting Party Involvement .............................................................................................. 6 2.3 Pre-Construction Meeting .................................................................................................... 7 2.4 Monitoring Procedures ........................................................................................................ 7 2.5 Construction Continuation ................................................................................................... 9

3 Guidelines for the Inadvertent Discovery of Archaeological Materials and Human Remains ............................................................................................................. 10 3.1 Procedures for the Discovery of Archaeological Materials ............................................... 10 3.2 Procedures for the Discovery of Human Remains, Funerary Objects, and Objects of

Cultural Patrimony ............................................................................................................. 11 3.3 Proceeding with Work ....................................................................................................... 12 3.4 Reporting ........................................................................................................................... 12

4 Contact List .................................................................................................................... 13 5 References Cited ............................................................................................................ 16

Tables Table 1 Property Information............................................................................................................ 2

Figures Figure 1 Project location for the South Park Pump Station. .............................................................. 4 Figure 2 Parcel detail of South Park Pump Station Project APE. ..................................................... 5



January 2020 Cardno iii

Acronyms APE Area of Potential Effects bgs below ground surface CFR Code of Federal Regulations DAHP Department of Archaeology and Historic Preservation ft Feet/foot HAZWOPER Hazardous Waste Operations and Emergency Response in Inch/inches JARPA Joint Aquatic Resources Permit Application LDW Lower Duwamish Waterway m Meter/meters MIDP Monitoring and Inadvertent Discovery Plan NHPA National Historic Preservation Act NPS National Park Service NRHP National Register of Historic Places NWP Nationwide Permit SOI Secretary of the Interior SPU Seattle Public Utilities TCP Traditional Cultural Property USACE U.S. Army Corps of Engineers WISAARD Washington Information System for Architectural and Archaeological

Records Data



January 2020 Cardno 1

1 Introduction

Seattle Public Utilities (SPU) is proposing to construct a new stormwater pump station on SPU-owned property located within the City of Seattle, Washington (Figure 1). The new stormwater pump will meet the outfall and collection expectations during all tidal conditions in the Lower Duwamish Waterway (LDW) and ease future expansions of the stormwater collection system and basin. SPU’s current stormwater drainage basin is located within 234 acres along 7th Avenue and is restricted by the tidal changes in the LDW. The project construction will prevent flooding from high tides and heavy rainfalls on to lower roadways and private properties. SPU submitted a Joint Aquatic Resources Permit (JARPA) to the U.S. Army Corps of Engineers (USACE) Seattle District in August 2019 (Sztern 2019).

ENTRIX, Inc. completed a cultural resources survey for the proposed pump station in 2009 (Zuccotti et al. 2009). The survey report noted the general area was located in the “South Park” agricultural center first platted in 1889, and with the channelization of the Duwamish River, the area developed into an industrial neighborhood and underwent significant alterations (Zuccotti et al. 2009). While the ground-surface has been paved and impacted by construction and utilities, archaeological sites along the banks of the Duwamish River have been observed at depths exceeding 1 meter (Zuccotti et al. 2009). As such, the survey report recommended a Monitoring and Inadvertent Discovery Plan (MIDP) be developed for the project and that project-related ground disturbing activities be monitored by an archaeologist. The Department of Archaeology and Historic Preservation’s (DAHP) predictive model on the Washington Information System for Architecture and Archaeological Records Data (WISAARD) characterizes the vicinity as high to moderate risk for containing buried archaeological materials.

SPU retained Cardno, Inc. to develop the MIDP for the project in compliance with the National Historic Preservation Act (NHPA). This MIDP provides the steps that SPU employees and their contractors/subcontractors will follow in the event of an inadvertent discovery. This plan contains the necessary steps to minimize damage to any inadvertently discovered archaeological resources during any ground-disturbing activities. Archaeological resources include objects modified by humans, and locations of human activity, occupation, or use, including sites or places of traditional, religious, and cultural importance to specified social and/or cultural groups. Examples of inadvertent discoveries are provided in Section 2.4.

All contractor and subcontractor construction personnel will review the MIDP prior to the start of any ground-disturbing construction activities. New construction personnel added after construction begins will be required to review the MIDP.

1.1 Regulatory Context The USACE is the lead federal agency for the project and must comply with Section 106 of the NHPA. Section 106 of the NHPA (36 Code of Federal Regulations [CFR] 800) states that any project requiring federal licensing or permitting take into account the effect of the undertaking on historic properties, which are cultural resources listed in or eligible for inclusion in the National Register of Historic Properties (NRHP). Under the NHPA, federal agencies must evaluate effects to all historic properties before a project is approved and seek ways to avoid, minimize, or mitigate adverse effects on historic properties.

The NRHP is maintained by the National Park Service (NPS) on behalf of the Secretary of the Interior (SOI). To guide the determination of eligibility of properties for inclusion in the NRHP, the NPS developed the NRHP Criteria for Evaluation (36 CFR § 60.4). These criteria are standards by which properties are evaluated for listing in the NRHP. The criteria consider the level of significance in American history, architecture, archaeology, and culture and are applied to districts, sites, buildings, structures, and objects that possess integrity of location, design, setting, material, workmanship, feeling, and association. To be




listed in or to be considered eligible for listing in the NRHP, a district, site, building, structure, or object must meet one of the following criteria:

Criterion A: Be associated with events that have made a significant contribution to the broad patterns of our history; or

Criterion B: Be associated with the lives of persons significant in our past; or

Criterion C: Embody the distinctive characteristics of a type, period, or method of construction or represent the work of a master, or possess high artistic values, or represent a significant and distinguishable entity whose components may lack individual distinction; or

Criterion D: Have yielded, or may be likely to yield, information important in prehistory or history.

Amendments to Section 106 of the NHPA specify that properties of religious and cultural significance (including Traditional Cultural Properties [TCPs]) may be determined to be eligible for inclusion in the NRHP. In carrying out their responsibilities under Section 106, federal agencies are required to consult with any Indian tribe that attaches religious or cultural significance to any such properties.

The USACE is consulting with the following parties in accordance with Section 106 of the NHPA (listed alphabetically): Department of Archaeology and Historic Preservation (DAHP), Muckleshoot Indian Tribe, Puyallup Tribe of Indians, Snoqualmie Indian Tribe, Stillaguamish Tribe of Indians, Suquamish Tribe, and Tulalip Tribes of Washington.

1.2 Project Location and Description This MIDP is for the proposed project located on two King County tax parcels (7327905700 and 7327905710) within the City of Seattle at street addresses 636 and 640 South Riverside Drive. These properties constitute the Area of Potential Effects (APE) for the project, which is the “geographic area or areas within which [the] undertaking may directly or indirectly cause alterations in the character or use of historic properties, if any such properties exist” (36 CFR § 800.16 (d)). Both properties are under the ownership of the SPU and are located within a modified landscape east of US Highway 509. These parcels are approximately 0.24 acres in size and are located in the southwest quarter of Section 29 of Township 24 North, Range 4 East (Table 1).

The APE is located west of the LDW, accessible from South Riverside Drive and South Holden Street (Figure 2). At present, the APE contains no standing structures and is characterized by compacted imported gravel and fill materials.

Quarter Section Township Range Street Address Parcel No.

SW 29 24 North 4 East 636 South Riverside Drive, Seattle 7327905710

SW 29 24 North 4 East 640 South Riverside Drive, Seattle 7327905700

Elements of the proposed pump station include the following:

> Construction of an electrical room to house power and backup generator consisting of approximately 46-x-36-foot (ft) in area and extending 20 ft above existing grade.

> Construction of a stormwater wet well with pump housing approximately 40-x-25-ft in area and extending 25-ft in subsurface depth.

> Construction of diversion structure to intercept 72-inch (in) outfall pipe,




> Construction of headbox consisting of an approximately 40-x-15-ft area with a maximum 12-ft below grade depth.

> Placement of effluent pipes and maintenance structure to intercept the 72-in outfall pipe with connections to headbox and existing outfall pipe.

Construction of these elements will involve excavation of the existing ground surface and subsurface, placement of shoring and formwork, and temporary shored trenches for precast pipe installation. SPU purchased the properties in 2008 and conducted cleanup activities in 2012. Previously, both properties were owned by a single landowner and occupied by a residence and a machine shop (Sztern 2019). SPU conducted geotechnical review of the project location in 2008 and updated their review in 2019 (Caraway 2019). The results of the geotechnical review indicate the soils on site consist of fill to about 2.5 to 5 feet (ft) below ground surface (bgs). The fill is underlain by interbedded alluvial sands and silts with organics that were deposited by the meandering Duwamish River, referred to as the Duwamish Sand. The soils were not overridden by glacial ice during the last glaciation, and as a result, they are relatively loose (Caraway 2019). Estuarine deposits consisting of sands and silts were identified at approximately 142 ft bgs, which are underlain by glacial drift beginning at 195 ft bgs.

1.3 Confidentiality All parties recognize that cultural resources and human remains are of a sensitive nature, and sites where cultural resources are discovered can become targets of vandalism and illegal removal activities. All parties shall keep and maintain as confidential all information regarding any discovered cultural resources, particularly the location of known or suspected human remains, and exempt all such information from public disclosure consistent with Washington State and federal law (e.g., 16 United States Code [U.S.C.] 470hh, 36 CFR 296.18, and RCW 42.56.300). All information indicating the location of known suspected cultural resources or human remains from this project shall be turned over to DAHP. While any party is in possession of this confidential information, such party shall limit access to these records to authorized persons.




2 Monitoring Protocols

SPU will retain a professional archaeologist to monitor select ground-disturbing activities related to project construction within the APE depicted in Figure 2.

2.1 Personnel Qualifications and Communication Requirements The archaeological monitor must be a professional archaeologist who is trained in archaeological field methods. The monitor will be supervised by an archaeologist who meets the SOI Professional Qualification Standards for Archeology (36 CFR Part 61).

The SPU Project Manager and Senior Cultural Resource Permitting Coordinator are the primary points of contact for the SOI-qualified archaeologist and monitor and will ensure that the provisions of this document are carried out. The monitor will be responsible for notifying the SOI-qualified archaeologist of any significant or potentially significant archaeological discoveries. The SOI-qualified archaeologist is responsible for notifying SPU of any significant archaeological find. SPU, with assistance by the SOI-qualified archaeologist, is the primary contact for notifying the Consulting Parties of any significant archaeological find.

The monitor may communicate with the on-site construction supervisor about equipment movement, placement of spoils for examination, and/or access to open excavations. The monitor may also communicate directly with equipment operators to determine the appropriate timing and procedures for accessing open excavations. The monitor may also request that operators temporarily halt or modify excavations to expose potential cultural resources. The monitor may request that operators modify excavation procedures to remove sediments in thin lifts in an effort to identify additional archaeological evidence. The monitor will follow all safety policies and procedures during monitoring activities.

The SOI-qualified archaeologist and/or monitor will be required to attend the pre-construction training as coordinated by SPU and their contractor or subcontractor prior to any monitoring activity. Section 2.3 discusses the pre-construction meeting that will be coordinated with the SOI-qualified archaeologist and/or monitor to inform the contractor and its employees as to what constitutes an unanticipated find and what steps are to be taken in the event of an inadvertent discovery. The monitor will also be required to have Hazardous Waste Operations and Emergency Response (HAZWOPER) certification and will wear appropriate personal protective equipment (PPE) while on site.

At the start of each work day, the monitor will report to the SPU Project Manager and/or the on-site Construction Manager to receive daily safety and information briefings.

2.2 Consulting Party Involvement For the purpose of this MIDP, the Consulting Parties consist of SPU, USACE, DAHP, Muckleshoot Indian Tribe, Puyallup Tribe of Indians, Snoqualmie Indian Tribe, Stillaguamish Tribe of Indians, Suquamish Tribe, and Tulalip Tribes of Washington. Contact information for each Consulting Party is listed in Section 4.

The SOI-qualified archaeologist will send email notification to all Consulting Parties with the construction start date at least two weeks prior to construction, if possible. Along with providing a schedule of monitoring and invitation to attend the pre-construction meeting, Consulting Parties will be invited to observe construction activities. If a Consulting Party wishes to observe the construction activities, they will be required to complete any safety training required by the contractor and subcontractor. Any Consulting Party who observes construction will also be required to wear appropriate PPE, which will not be provided by the contractor or subcontractor.




2.3 Pre-Construction Meeting All contractor and subcontractor construction personnel will meet with the SOI-qualified archaeologist and/or monitor for MIDP training and orientation prior to the start of any ground-disturbing construction activities. The MIDP training will be developed by the SOI-qualified archaeologist and/or monitor in coordination with SPU. New construction personnel added after construction begins will be trained before working on site.

During the pre-construction meeting, all construction personnel will be trained as to what constitutes cultural resources and inadvertent finds. The meeting will also inform the construction personnel what steps are to be taken in the event of an inadvertent discovery as outlined in this plan in Section 3. All construction personnel will be instructed to alert the monitor if they suspect an inadvertent discovery.

The Consulting Parties will be notified of the pre-construction meeting and will be invited to attend.

2.4 Monitoring Procedures This section outlines the procedures for archaeological monitoring in the APE.

Once SPU has a confirmed work schedule, SPU or the SOI-qualified archaeologist will notify all Consulting Parties of the proposed work schedule and invite all parties to observe the construction.

The monitor will seek to identify potential buried surfaces, anthropogenic sediments, and previously unidentified archaeological features or artifact‐bearing strata during ground-disturbing activities. The monitor will inspect all disturbed areas and the recovered soil or sediment for indications of such archaeological resources. If ground-disturbing activities are planned in multiple locations, additional monitors may be needed on site to monitor those areas.

The monitor will record the construction as follows: daily activities will be documented on a Daily Record Form or field notebook. Overview photographs of the work area, monitored locations, example work activities, and any cultural materials will be taken as needed. The monitor will provide photographic information in a photograph log. If necessary, the monitor will prepare sketches/drawings of particular areas, artifacts, features, and soil profiles. The locations of archaeological monitoring will be recorded on a field map for the project.

Archaeological monitoring will occur for all ground-disturbing activities. The monitor will stand in close proximity to heavy equipment in order to view subsurface deposits as they are exposed, making all reasonable efforts to ensure safety and noninterference. The monitor will be in close communication with the SPU Project Manager and/or the Construction Manager and equipment operators to ensure adequate opportunity for observation and documentation. The monitors will follow the protocols set forth in the on-site health and safety plan developed by SPU and/or construction contractor.

The Daily Record Form will be completed each day when monitoring occurred and will be submitted nightly to the SOI-qualified archaeologist so that it is available for review by all Consulting Parties. The Daily Record Forms will also be used to compile a brief weekly status report that will be submitted in electronic form (i.e., via email) to the Consulting Parties by the SOI-qualified archaeologist for any week that archaeological monitoring is conducted.

For safety reasons, the monitor will not enter any excavations deeper than 4 ft (1.22 m) to inspect potential cultural resources unless the trench has safe access and egress and has been appropriately shored by the contractor. The archaeological monitor(s) will follow all safety policies and procedures per Occupational Safety and Health Administration (OSHA) standards at 29 CFR 1926.652.

The monitor may communicate with the on-site construction supervisor about equipment movement, placement of spoils for examination, or access to open excavations. The monitor may also communicate directly with equipment operators and may also request that operators temporarily halt




or modify excavations to expose suspected cultural resources. In limited cases, the monitor may request that operators modify excavation procedures to remove sediments in thin lifts in an effort to identify additional archaeological evidence.

If during excavations, the monitor or any member of the construction crew believes that they have encountered archaeological materials, the monitor will direct the contractor to STOP WORK— at least temporarily—at that location to protect potential cultural resources. The monitor will immediately contact SPU and the SOI-qualified archaeologist to provide stop work notification.

SPU and on-site Construction Manager, in communication with the monitor, will establish a buffer zone appropriate in size to the location and nature of the discovered cultural material.

SPU will coordinate with on-site construction personnel about the archaeological monitoring work and make provisions, within its agreement with the contractor(s), for work stoppage, relocation of activity, and for temporary shoring of the trench, when applicable, for inspection of possible finds.

Precontact archaeological materials may include, but are not limited to:

a. Intact and redeposited shell midden sediments;

b. Clusters of fire-modified rock (FMR), charcoal, or other evidence of fire-related activities;

c. Discarded shell, animal bone, bone tools, cordage, fibers, burned earth, charcoal, ash, and exotic rocks and minerals;

d. Faunal remains modified or found in association with stone chips or tools; and

e. Ground or chipped stone objects (i.e. debitage or tools).

Historic-period archaeological materials may include, but are not limited to:

a. Features such as utility lines, piles and bulkheads, footings, and foundations;

b. Additional intact and/or disturbed railroad grade or railroad features; and

c. Isolated artifacts composed of glass, metal, ceramic, or other materials manufactured more than 50 years ago.

According to DAHP guidelines, archaeological resources are defined as follows:

a. Isolate: One distinct artifact or a few fragments of the same artifact that are too far away (typically more than 98 ft [30 m]) from other cultural materials (over 50 years old) to be considered part of a site. If diagnostic, the find should be recorded on a State of Washington Archaeological Isolate Inventory Form accompanied by photographs.

b. Intact Artifact Deposit or Feature: Two or more distinct artifacts or one feature (immovable object such as a concrete foundation) within a 164-ft (50-m) area. Such deposits would be considered an archaeological site and depending on their size and nature, take longer than an isolated find to record on an State of Washington Archaeological Site Inventory Form.

c. Disturbed Artifact Deposits: Artifacts identified in disturbed soils (such as historic fill) should be documented in monitoring notes and photographed. Depending on the volume of artifacts and the level of disturbance, the site may or may not need to be recorded on an Archaeological Site Inventory Form. Further investigation may be necessary to determine the presence of additional artifacts, determine the potential site boundary, and notify the appropriate parties of the inadvertent discovery.

d. Other: Abandoned/remnant utilities and materials less than 50 years old are not considered significant. These items should be documented in monitoring notes, but are not recorded on DAHP isolate or site forms. No further action is necessary.




The monitor will identify whether any observed cultural materials should be classified as an isolate, an intact archaeological deposit, disturbed artifact deposits, or other materials, and discussion between DAHP and the SOI-qualified archaeologist may occur. The procedures listed in Section 3.1, Inadvertent Discovery of Archaeological Resources, will be followed.

If suspected human remains are observed during project activities, the procedures listed in Section 3.2, Inadvertent Discovery of Human Remains, will be followed.

The monitor may examine excavated spoils in the course of excavation activities. If cultural materials are observed in spoil piles, these materials would be removed for further examination. It is expected that the opportunity to screen spoil soil or sediment would be available. If cultural materials are encountered in the spoil piles, the monitor will communicate with the SPU Project Manager and the on-site Construction Manager to halt all ground-disturbing activity within 50 feet of original location of the discovery, and the procedures outlined in Section 3 will be followed.

When monitoring work has been completed, the SOI-qualified archaeologist will prepare a technical report outlining field methods, monitoring observations, and results. The draft report will be provided to SPU (via email) for review. Following one round of review by SPU, an updated draft report (in PDF format) will be distributed to the Consulting Parties for comment and review. The SOI-qualified archaeologist will incorporate and/or acknowledge revisions from the Consulting Parties into a final technical report after a single review period, which will be uploaded to the WISAARD.

2.5 Construction Continuation Work outside the discovery location may continue while documentation and assessment of the inadvertent discovery proceed as long as there is another monitor present.

If the discovery is determined to be a recent deposit, construction may resume once cleared by the monitor and as authorized by the SPU Project Manager and/or the on-site Construction Manager.

If the discovery is determined to be an archaeological site, construction may resume only after the steps outlined in Section 3.1 are followed.

If the discovery is determined to consist of human remains, funerary objects, and/or objects of cultural patrimony, construction may resume only after the steps outlined in Section 3.2 are followed.




3 Guidelines for the Inadvertent Discovery of Archaeological Materials and Human Remains

3.1 Procedures for the Discovery of Archaeological Materials If during ground-disturbing project activities, the monitor, SPU personnel, or construction personnel

believe that they have encountered precontact (including, but not limited to, intact deposits of midden; clusters of FMR, charcoal, or other evidence of fire-related activities; stone chips or tools; and faunal remains in association with stone chips or tools) or historic-period archaeological materials the archaeologist or construction crew member will immediately stop work—at least temporarily—at that location to protect potential additional resources.

If the encountered artifacts or cultural deposits are located within disturbed sediments, the monitor may request that mechanical excavation continue to assess the extent of the deposit and the nature of soils/sediments. The monitor will coordinate with SPU to direct the contractor in such circumstances. If excavation is allowed to continue, the monitor will take notes on the discovery along with overview photographs to formulate a basic description of the characteristics and location of the cultural materials for further investigation during future phases of construction work, to allow for minimal delays.

If the monitor believes that the find is an archaeological resource requiring further evaluation, SPU will take appropriate steps to protect the discovery site by installing a physical barrier (i.e., exclusionary fencing) and prohibit all machinery, other vehicles, and unauthorized individuals from crossing the barrier.

Within 6 hours of the initial discovery, and once the site has been preliminarily characterized, the SOI-qualified archaeologist will notify SPU, USACE, and DAHP via phone and email regarding the inadvertent discovery. If applicable, a photo of the discovery will be included in the notification. A determination of eligibility for listing in the NRHP must be obtained for archaeological sites.

The SOI-qualified archaeologist will evaluate the inadvertent discovery per NRHP Criteria for Evaluation and submit a recommendation of eligibility to SPU and USACE, who will consult with the Consulting Parties. The NRHP-eligibility recommendation will be provided within the initial week after discovery (and ideally within 36 hours), as feasible. Evaluation of the inadvertent discovery may include mapping, photography, subsurface testing, sample collection, and/or other activities, as determined appropriate.

If the inadvertent discovery is determined to be a NRHP-eligible resource, the USACE will consult with the Consulting Parties regarding potential treatment and/or mitigation efforts for this historic property.

SPU will arrange any and all treatment or mitigation efforts required by the USACE, in consultation with the Consulting Parties.

When evaluation of the inadvertent discovery has been completed, the SOI-qualified archaeologist will prepare a brief technical memorandum discussing the methodology and results. The draft memorandum will be provided to SPU for a single collated review. The SOI-qualified archaeologist will address the comments and provide a final draft copy to the SPU and will assist with distribution to the Consulting Parties. After a single review period, a final report will be prepared and submitted to the Consulting Parties.

In the case of an isolated archaeological find, construction excavation will likely not halt for more than the time required by the SOI-qualified archaeologist to photograph and record details of the location (e.g., depth below the ground surface, sedimentary context) and other pertinent information about the




isolated find. Construction activities may resume in the area when SPU and the USACE, in coordination with the SOI-qualified archaeologist, has notified the SPU Project Manager and construction manager that this work is complete and that construction may resume.

All encountered precontact and historic artifacts from the surface and/or construction excavations will be analyzed in the field and catalogued by the SOI-qualified archaeologist. The disposition of cultural materials will be determined in consultation with SPU, USACE, and Consulting Parties.

3.2 Procedures for the Discovery of Human Remains, Funerary Objects, and Objects of Cultural Patrimony

Any unmarked burial grave or unregistered grave, human remains, funerary object, or object of cultural patrimony, that are discovered during project-related excavation will be treated with dignity and respect.

If project related ground-disturbing activities encounter an unmarked burial grave or unregistered grave, funerary object, or object of cultural patrimony, all project activity within 100 ft (30.5 m) of that location must be immediately halted. A STOP WORK will be announced and the inadvertent discovery must be secured and protected from further disturbance. Efforts will be made to protect the discovery from looting and vandalism and it will not be removed or otherwise disturbed. Onsite personnel will not speak with media or share any information on social media. The following steps should be taken:

Any person who discovers skeletal human remains must notify the medical examiner and local law enforcement in the most expeditious manner possible (see Section 4 for contact information). DO NOT CALL 9-1-1.

The monitor, in coordination with the SOI-qualified archaeologist, will observe the discovery immediately without causing further disturbance. Remains will be covered with a tarp or other materials (not soil or rocks) for temporary protection in place and to shield them from being photographed.

a. If onsite personnel is unable to determine whether the remains are human or animal, the monitor will contact the SOI-qualified archaeologist for confirmation. For further verification regarding the type of remains, the SOI-qualified archaeologist may contact DAHP’s Physical Anthropologist (Dr. Guy Tasa) with photographic images:

i. If the results of the evaluation indicate that the remains are not human and do not have an archaeological association, construction will be permitted to continue.

ii. If the evaluation determines the remains are not human but have an archaeological association, the procedures for Inadvertent Discovery of Archaeological Materials (see Section 3.1) will be followed.

iii. If the results of the evaluation indicate the remains are human, then the onsite Project Manager or SOI-qualified archaeologist will notify the King County Medical Examiner and local law enforcement, and Consulting Parties.

The King County Medical Examiner will assume jurisdiction over the remains and determine if they are forensic or nonforensic.

The King County Medical Examiner will retain jurisdiction over forensic remains. The work stoppage in the area will continue until such time that the medical examiner has secured and removed the remains from the discovery site.

If the King County Medical Examiner determines the remains are nonforensic, they will report that finding to DAHP. DAHP’s Physical Anthropologist will examine the remains and notify the affected Indian tribes of the results of the examination.




The USACE will lead all consultation efforts with the Consulting Parties and others as applicable as to the future preservation, excavation, and ultimate disposition of the remains.

SPU may resume project-related activities in the area of the discovery upon receipt of written authorization from either the medical examiner or the DAHP, whoever has jurisdiction under state law.

3.3 Proceeding with Work Work outside the discovery location may continue while treatment of the discovery proceeds. Construction activities may continue at the discovery location only after the process outlined in this plan is followed and compliance with applicable laws is complete.

3.4 Reporting When evaluation of the inadvertent discovery has been completed, the SOI-qualified archaeologist will prepare a brief technical memorandum discussing the field methodology, nature of the discovery, assessment, and recommendations. The draft memorandum will be provided to SPU for a single collated review. The SOI-qualified archaeologist will address the comments and provide a final memorandum to the USACE and Consulting Parties.




4 Contact List

The project contacts are listed below. The communication procedures listed in Sections 2 and 3 will be followed. Any changes in personnel or contact information should be immediately shared with SPU and the SOI-qualified archaeologist and included in an updated contact list.

Seattle Public Utilities (SPU)

Shailee Sztern, P.E., Project Manager

Phone: 206-256-5256

Email: [email protected]

Heather Walker, Senior Cultural Resources Permitting Coordinator

Phone: 206-233-3711; 206-643-4108 (cell)


Department of Archaeology and Historic Preservation (DAHP)

Dr. Rob Whitlam, State Archaeologist

Phone: 360-586-3080; 360-890-2615 (cell)


Dr. Guy Tasa, State Physical Anthropologist

Phone: 360-586-3534; 360-790-1633 (cell)


Law Enforcement

City of Seattle Police Department (Non-emergency)

Phone: 206-625-5011

Medical Examiner

King County Medical Examiner

Phone: 206-731-3232

Muckleshoot Indian Tribe

Laura Murphy, Preservation Program, Cultural Resources

Phone: 253-876‐3272



mailto:[email protected]




https://www.google.com/search?q=king+county+medical+examiner&rlz=1C1GCEB_enUS825US825&oq=king+county+medi&aqs=chrome.0.0l6.2790j1j7&sourceid=chrome&ie=UTF-8




Puyallup Tribe of Indians

Brandon Reynon, Cultural Resources

Phone: 253-573-7986


Snoqualmie Indian Tribe

Steven Mullen-Moses, Director of Archaeology & Historic Preservation

Phone: 425-292-0249 x2010


Adam Osbekoff, Cultural Resource Outreach Specialist

Phone: 425-292-0249 x2010; 425-753-0388 (cell)


Stillaguamish Tribe of Indians

Kerry Lyste, Tribal Historic Preservation Officer

Phone: 360-572-7072


Suquamish Tribe

Dennis E. Lewarch, Tribal Historic Preservation Officer

Phone: 360-394-8529


Tulalip Tribes of Washington

Richard Young, Cultural Resources

Phone: 360-716-2652


U.S. Army Corps of Engineers – Seattle District

Lance Lundquist, Archaeologist

Phone: 206-764-6909 Email: [email protected]











SOI-Qualified Archaeologist – Cardno

Michelle Hannum, Project Archaeologist

Phone: 206-239-0281; 509-592-7575 (cell)


Contractor

TBD

Phone:

Email:





5 References Cited

Caraway, Sean 2019 South Park Pump Station Review and Update of Geotechnical Recommendations and

Geotechnical Design Parameters. Report prepared by Seattle Public Utilities Geotechnical Engineering, Seattle. On file, Seattle Public Utilities, Seattle.

Sztern, Shailee 2019 Washington State Joint Aquatic Resources Permit Application (JARPA) Form for South Park

Pump Station, NWS-2009-00529-WRD. Submitted by Seattle Public Utilities, Seattle. On file, Seattle Public Utilities, Seattle.

Zuccotti, Lucy Flynn, Jennifer L. Flathman, Kimberly Demuth, and David Harvey 2009 Cultural Resources Survey for the 7th Avenue South Pump Station and Water Quality Project,

Seattle, WA. Submitted by ENTRIX, Inc., Seattle. On file, Washington State Department of Archaeology and Historic Preservation, Olympia.


Insert Report Title Insert Project Name

SPU_WA-2 South Park Pump Station MIDP_20200108.docx

il 2, Click or tap here to enter text. Cardno References Cited 5-17 SPU_WA-2 South Park Pump Station MIDP_20200108.docx

About Cardno Cardno is an ASX-200 professional infrastructure and environmental services company, with expertise in the development and improvement of physical and social infrastructure for communities around the world. Cardno’s team includes leading professionals who plan, design, manage, and deliver sustainable projects and community programs. Cardno is an international company listed on the Australian Securities Exchange [ASX:CDD].

Cardno Zero Harm At Cardno, our primary concern is to develop and maintain safe and healthy conditions for anyone involved at our project worksites. We require full compliance with our Health and Safety Policy Manual and established work procedures and expect the same protocol from our subcontractors. We are committed to achieving our Zero Harm goal by continually improving our safety systems, education, and vigilance at the workplace and in the field. Safety is a Cardno core value and

through strong leadership and active employee participation, we seek to implement and reinforce these leading actions on every job, every day.

www.cardno.com


PERMITS OBTAINED BY OWNER SECTION 00 31 43 SOUTH PARK PUMP STATION Page 1

SPU rev. 4/1/14

PART 1 - GENERAL

1.01 SECTION INCLUDES A. This Section includes copies of the permits which have been obtained by the Owner

and, if applicable, a description of the permits still in the process of being obtained.

1.02 PERMITS A. The following permits attached at the end of this section have been obtained by the

Owner or will be obtained by the Owner: 1. Nationwide Permit (Section 10) – Army Corps of Engineers (Pending) 2. Construction Stormwater General Permit (#WAR308085) – WA Department of

Ecology a. The Owner shall complete a total transfer of the Construction Stormwater

General Permit to the Contractor. The Contractor must pay all fees for the Construction Stormwater General Permit.

3. Master Use Permit – Seattle Department of Construction and Inspection (SDCI) 4. Building Permit – SDCI (Pending) 5. Street Improvement Permit (#405475) – Seattle Department of Transportation

(SDOT) 6. SEPA DNS – Seattle Public Utilities (SPU)

PART 2 - PRODUCTS Not used.

PART 3 – EXECUTION Not used.

End Section 00 31 43


GEOTECHNICAL INSTRUMENTATION AND MONITORING SECTION 31 09 13 SOUTH PARK PUMP STATION FINAL DESIGN Page 1

PART 1 - GENERAL 1.01 SUMMARY A. This Section specifies the qualifications, installation, monitoring, maintenance and

reporting requirements for settlement and vibration monitoring.

B. RELATED SECTIONS: The work of the following Sections is related to the work of this Section. Other Sections, not referenced below, may also be related to the proper performance of this work. It is the Contractor’s responsibility to perform all the work required by the Contract Documents. 1. Section 01 33 10

2. Section 01 71 23

3. Section 03 30 00

4. Section 31 05 00

5. Section 31 23 20

6. Section 31 41 00

C. Purpose 1. Settlement Monitoring:

a. The settlement indicator points will provide reference points for monitoring vertical and horizontal ground movement and to establish a baseline record of such movement.

b. Measurements of ground movement will provide the basis for the implementation of remedial measures to prevent possible damage to structures and utilities.

c. Remedial measures, if necessary, include modifications of construction procedures, repair or replacement of damaged facilities and restoration to original conditions of any disturbed property, structure or utility.

2. Vibration Monitoring a. The vibration monitoring will determine if the equipment and methods

used to complete the work cause vibrations which equal or exceed a specific standard which could cause damage to existing facilities.

b. The data gathered will provide on-site feedback of the effects of specific operations and procedures which may, over an extended period, cause damage.

c. Operations that are found to cause vibration damage shall be modified to prevent damage from vibration.



3. Shoring Deformation Monitoring

a. The shoring deformation monitoring will provide reference points for monitoring lateral deformation of the sheet pile sections and will establish a baseline record of such deformation/movement.

b. The measurements of the lateral deformations for the sheet pile sections will provide the information for ongoing evaluation of the performance of the shoring, during the period of the excavation work, and will enable a determination regarding the adequacy of the shoring for maintaining safe conditions within the excavation and/or whether there is increased potential or risk for damage to nearby structures, if the performance of the shoring is inadequate.

c. If lateral deformations of the sheet pile sections exceed tolerances, mitigation measures shall be required and implemented to enable continued work within the excavation and to allow for the excavation to remain open.

1.02 QUALITY ASSURANCE A. REFERENCED STANDARDS: This Section incorporates by reference the latest revision

of the following documents. It is a part of this Section as specified and modified. In case of conflict between the requirements of this Section and that of the listed document, the requirements of this Section shall prevail.

Reference Title

AASHTO H-20 Standard Specification for Highway Bridges – H-20 Truck Load

Chapter 173-160 WAC

Minimum Standards for Construction and Maintenance of Wells

1.03 DEFINITIONS A. Instrumentation Wells: All holes drilled below the groundwater table for the purpose of

installing geotechnical instruments.

B. Geotechnical Instruments: Instruments used to measure settlement, depth to groundwater table and vibrations. Includes settlement monitoring points, groundwater observation wells and vibration monitors.

C. Optical Survey Monitoring: Precise field measurements using survey techniques for determination of elevations, coordinates and distances for performing geotechnical instrumentation monitoring.



D. Settlement Monitoring Points: 1. Fixed markers placed on structures and utilities for monitoring changes in elevations

of new and existing structures and existing utilities. 2. Monitored by optical survey methods to determine vertical or horizontal

displacements. 3. Include structure and utility settlement points.

E. Shoring Deformation Monitoring Points: 1. Fixed points placed at specific elevations, at specific distances along the sheet pile

section shoring walls. The spacing of the shoring monitoring points shall be roughly 20 feet, along each of the sheet pile walls, with a minimum of two monitoring points on the north and south walls and three monitoring points on the east and west walls. The exact locations shall be determined by the contractor.

2. Monitored by optical survey methods to determine lateral deformations. F. Action Level: Specified amount of measured movement at which point action shall be

taken to adjust the excavation and construction operations. G. Vibratory Monitors: Seismographs used to measure vibration levels in velocity and

frequency. 1.04 SUBMITTALS A. Procedures: Section 01 33 10. B. Qualifications of the individual(s) responsible for the installation and monitoring of the

vibration, settlement and shoring deformations. C. Settlement, Shoring Deformation and Vibration Instrumentation Installation and

Monitoring Plan, including: 1. Schedule and timing for instrument installation and performance of monitoring,

including summary table for all instrument installations by number and location a. Timing of each instrument installation. b. Initial baseline monitoring schedule. c. Timing of monitoring commencement and schedule of monitoring for each

instrument. 2. Individuals responsible for all monitoring, report writing and format of reporting 3. Operating manuals, specifications and installation procedures for each type of

instrumentation. 4. Documentation of calibration checks on individual instruments and readouts for

the vibration monitors, including recalibration after any damage or disturbance. 5. Procedure to confirm that instruments are working correctly following installation. 6. Outline of procedures detailing how monitoring will be conducted. 7. Data review process for comparison to indicated Action Levels. 8. Corrective Action Plan



a. Details of actions to be taken in the case of settlement, shoring deformations or vibrations exceeding the specified Action Levels.

b. Include operational changes to reduce the rate of settlement. 9. Detailed plan of instrumentation locations. 10. Sample data forms and data output files in MS Excel format for settlement and

shoring deformation monitoring. 11. An updated list and testing is required when equipment is brought to the site

which has not been previously tested for this Contract. D. Daily reports of the work monitored and completed including a printout recording peak

wave data every minute during construction operations. The Contractor shall include observations that will help in describing the monitoring results of that day.

E. Reports of settlement and shoring deformation monitoring data. F. Survey report every two weeks for tie-in check of all settlement and shoring deformation

monitoring points relative to project survey control. 1.05 QUALITY ASSURANCE A. The Settlement, Shoring Deformation and Vibration Instrumentation Installation and

Monitoring Plan shall be approved and monitoring points shall be established prior to the beginning of the sheet pile installation and shall remain in place and monitored through all ground improvement activities, structure installation and pipeline excavation.

B. Qualifications: 1. Surveyor: Section 01 71 23, Field Engineering 2. Instrumentation Specialist that will manage/oversee acquisition, installation, data

collection and analyze/interpret instrumentation: a. At least five (5) years experience in installation, monitoring and analyzing

similar types of settlement monitoring in urban environments. b. Employed by a firm regularly engaged in settlement, lateral deformation

or deflection and vibration instrumentation and monitoring. c. Not employed directly by the Contractor.

C. Installation and decommissioning of all instrumentation wells shall be performed by a Washington State licensed well contractor.

1.06 EMERGENCY MEASURES A. Whenever there is a condition which is likely to endanger the stability of the excavation

or adjacent structures and utilities, as indicated by the periodic collection of data or by visual observations, operate a full crew for 24 hours a day, including weekends and holidays, without interruption, until those conditions are controlled and no longer jeopardize the stability of the work or adjacent structures.

1.07 AS-BUILT DRAWINGS A. Settlement Points, Shoring Deformation Monitoring Points and Vibration Monitoring

Devices on a maximum scale of 1 inch equals 20 feet and elevation using the City of Seattle Datum and Easting and Northing coordinates



1.08 SETTLEMENT AND SHORING DEFORMATION MONITORING DATA A. Instrumentation Specialist shall upload settlement monitoring data to MS Excel within

eight hours of the readings being taken. B. Present settlement and shoring deformation monitoring data using City of Seattle Datum. C. Prepare settlement and shoring deformation monitoring data plots using MS Excel,

review plots for accuracy and completeness and submit electronic copies of data reports and plots to the Engineer.

1.09 MEASUREMENT REQUIREMENTS FOR SETTLEMENT AND SHORING DEFORMATION MONITORING A. Establish the initial elevations of settlement and shoring deformation monitoring points to

0.01 foot. B. Record the subsequent elevations of settlement and shoring deformation monitoring

points to 0.01 foot. C. Achieve level circuit closure with an error of closure of 0.017 N-feet or less, where N is

the circuit distance in miles. D. Establish the initial horizontal coordinates of monitoring points to 0.01 foot.

1.10 AVAILABILITY OF DATA

A. Do not disclose data reports and all other unprocessed data, readings and observations to third parties.

1.11 RIGHT OF ENTRY

A. Right of entry to private property to be provided by the City.

1.12 PRE-AND POST-CONSTRUCTION SURVEYS

A. Pre- and post-construction surveys of the existing structures indicated in the Contract Documents to be performed by a surveyor contracted by the Contractor’s independent testing service. The same surveyor shall conduct both the pre- and post-construction surveys.

PART 2 PRODUCTS 2.01 GENERAL

A. Provide instrumentation reading devices, fixtures, cables and necessary software for the

various monitoring systems. B. Type S fill: Section 31 05 00, Common Work Results for Earth Work. C. Access covers for utility settlement points

1. Frame: Heavy duty steel or cast iron construction. 2. Lid: Solid steel or cast iron, gasketed and locking (requiring a flush surface

entry).



3. Dimensions: Appropriate to borehole diameter and instrumentation requirements.

4. Load rating: AASHTO H-20. 5. Acceptable access cover manufacturers: Morris Products, Inc., Olympic Foundry

Inc., or approved equal. D. Pavement repair: Four (4) temporary pavement patch materials products approved by

the Engineer for use include: 1. Unique Paving Material (UPM) Alpine Products Phone: (253) 351-9828 E-mail: [email protected] Web-site: www.upm.com

2. Qualified Patch Material (QPR) 3. E Z Street Lakeside Industries

PO Box 7016 Issaquah, WA 98027 Phone: (425) 313-2681 Fax: (425) 313-2622 Web-site: www.lakesideind.com

4. U.S. Cold Patch Phone: (425) 244-5000 Fax: (425) 423-9120 Web-site: www.uscoldpatch.com 5. Other temporary patching products may be submitted to the Engineer for approval.

2.02 SETTLEMENT POINTS A. Structure Settlement Points:

1. Structure settlement points installed in walls or vertical surfaces shall consist of fixed or reflector targets or ½-inch diameter steel expansion bolts drilled and anchored in or bonded to the surface as shown on the Drawings.

2. Bolts shall be embedded a minimum of 2 inches and project ½-inch from the vertical surface.

3. Optical or laser surveying methods will be used for monitoring settlement.

B. Utility Settlement Points:

1. Fixed end fiberglass rod extensometer and manual read mechanical reference head.

2. Install by digging a pit or vacuuming a hole above the utility or buried structure to be measured.

3. For excavated pits, the final 3 feet shall be dug by hand.

4. Utility shall be cleaned in the area of the elevation rod installation



http://www.upm.com/

http://www.lakesideind.com/


5. Fiberglass rod shall then be grease packed to the top of the utility.

6. Casing shall be centered over the rod using centralizers.

7. Casing shall be cut to form a tight fit over the utility.

8. Backfilling around the casing shall be with the removed material or Type S fill per Section 31 05 00, Common Work Results for Earth Work.

2.03 SHORING DEFORMATION POINTS A. Shoring Deformation Points:

1. Shoring deformation monitoring points installed on sheet pile walls shall consist of fixed or reflector targets.

2. Optical or laser surveying methods will be used for monitoring shoring deformations.

2.04 VIBRATION MONITORING DEVICE A. The Contractor shall provide at least two portable seismographs for monitoring the

velocities of ground vibrations resulting from construction activities. The number of seismographs provided shall be:

1. Sufficient to monitor the utilities and structures shown in the Drawings. 2. Determined by the Contractor based on the Contractor’s selected means and

methods and construction sequencing.

B. The furnished seismographs shall be Model Blastmate III, as manufactured by Instantel Inc. or approved equal having the following features:

1. External triaxial geophone and air overpressure microphone.

2. Three channels for vibration monitoring plus a fourth channel for air overpressure monitoring.

3. Two power sources: internal rechargeable battery and charger and 115 volts AC. Battery shall be capable of supplying power to monitor vibrations continuously for up to 30 days.

4. Self-triggering waveform capture mode that provides the following information: plot of wave forms, peak particle velocities, peak overpressure, frequencies of peaks.

5. Continuous monitoring mode shall be capable of recording single-component peak particle velocities, and frequency of peaks with an interval of one minute or less.

6. Computer software for performing continuous monitoring, data downloading, analysis and producing reports.



C. The portable seismographs shall meet the following measurement requirements:

1. Seismic range: 0.005 to 10 inches per second.

2. Seismic accuracy: +/- 3 percent of the measured peak particle velocity or better at frequencies between 3 Hertz and 250 Hertz.

3. Seismic resolution: 0.005 inches per second or less.

4. Acoustic range: 88 to 148 dB (referenced to 20 micro-Pascals) with an accuracy and resolution of +/-0.3 dB.

5. Acoustic frequency response: 2 to 250 Hertz.

6. Capable of internal dynamic calibration.

PART 3 EXECUTION 3.01 GENERAL A. Install the utility and building settlement monitoring points as indicated on the Drawings

and as close as practical to the locations indicated on the Drawings. Adjust for actual conditions in the field.

B. Exact locations of instrumentation shall be field-determined and shall be approved by the Engineer prior to installation.

C. Verify location of buried utilities before installation of instrumentation.

D. Provide all necessary power for the monitoring equipment.

E. Provide as-built of instrumentation locations within five days of installation.

3.02 SETTLEMENT MONITORING A. General:

1. Unless otherwise directed by the Engineer, perform monitoring at those locations shown on the Drawings.

2. Record the readings prior to, during and after Substantial Completion of deep soil mix column construction.

3. These readings shall be submitted daily on forms acceptable to the Engineer. 4. The readings shall be, at a minimum, at the following frequency intervals:



When Frequency

Prior to construction activity being monitored For two weeks, every seven days

During construction within 200 feet of construction activity

Daily

After substantial completion of construction activity being monitored

For one month, every seven days

B. Limit construction activities to control structure or utility settlement to a maximum of 1.0

inch.

C. Action Level: When monitoring produces readings over 0.5 inch, alter operations to assure that the action level is not exceeded and notify the Engineer.

D. Settlement monitoring points shall be installed, monitored, protected, maintained and

removed and the area restored to a minimum of preconstruction condition. 3.03 SHORING DEFORMATION MONITORING A. General:

1. Unless otherwise directed by the Engineer, perform monitoring at locations selected by the contractor, in accordance with Part 1.03, Sub-Part E of this Specification Section (31 09 13).

2. Record the readings prior to, during and after Substantial Completion of within excavation construction.

3. These readings shall be submitted daily on forms acceptable to the Engineer. 4. The readings shall be, at a minimum, at the following frequency intervals:

When Frequency

During excavation construction activity, until permanent retaining structures are completed

During excavation down to the base, the first week after reaching the base and during all in excavation activities, beyond the first week after reaching the base (until the permanent retaining structures are in place; daily (by optical survey – for both cantilevered and braced sheet pile walls



B. SPU should be notified and a contingency for modifying construction activities should be developed, if deformations or deflections exceed the values indicated in Shoring General Structural Note 6 (A and B) on Plan Sheet S-101.

C. Action Level: When monitoring produces readings that exceed 0.75 inch (between

consecutive readings or total deformation, for cantilevered sheet pile wall) or 0.35 inch (between consecutive readings or total deformation, for braced sheet pile wall) (indicated in Shoring General Structural Note 6, Plan Sheet S-101), alter operations to assure that the action level is not exceeded and notify the Engineer.

D. Shoring deformation monitoring points shall be installed, monitored, protected and

maintained until permanent retaining structures are complete. 3.04 INSTRUMENT INSTALLATION A. Structure settlement monitoring points: 1. Structure settlement points installed in walls or vertical surfaces shall consist of fixed

reflector targets or ½-inch diameter steel expansion bolts drilled and anchored in or bonded to the surface as shown on the Drawings.

2. Bolts shall be embedded a minimum of 2 inches and project ½-inch from the vertical surface.

3. Optical or laser surveying methods will be used for monitoring settlement.

B. Utility settlement monitoring points:

1. Install by digging a pit or vacuuming a hole above the utility or buried structure to be measured.

2. For excavated pits, the final three feet shall be dug by hand.

3. Utility shall be cleaned in the area of the elevation rod installation.

4. Fiberglass rod shall then be grease packed to the top of the utility.

5. Casing shall be centered over the rod using centralizers.

6. Casing shall be cut to form a tight fit over the utility.

7. Backfilling around the casing shall be with the removed material or Type S fill per Section 31 05 00, Common Work Results for Earth Work.

8. Complete by installing access covers and patching pavement.

C. Shoring deformation monitoring points:

1. Shoring deformation monitoring points installed on sheet pile walls shall consist of fixed or reflector targets.

2. Optical or laser surveying methods will be used for monitoring shoring deformations.



D. Vibration monitors:

1. For monitoring in the vicinity of nearby structures or utilities, vibration sensors shall be located on the ground surface near the structures or utilities.

2. Geophones shall be installed in accordance with the manufacturer’s recommendations.

3. Geophones shall be oriented toward the construction activity. 3.04 SETTLEMENT AND SHORING DEFORMATION BASELINE READINGS AND

CALIBRATION A. Make initial readings on all settlement and shoring deformation monitoring points, in

accordance with 1.09: 1. Three complete sets of baseline measurements and readings shall be taken at all

of the settlement monitoring points. 2. Baseline readings shall be comparable and equal within the rated instrument

accuracy.

B. Instrument calibration:

1. The optical survey monitoring and vibration monitoring systems shall, at all times during the monitoring program, meet the manufacturer’s minimum calibration requirements.

2. Correlate readings from any new replacement instrumentation with the previously acceptable data.

3. Settlement and shoring deformation monitoring points shall be measured relative to a survey bench mark located at least 500 feet from the site.

3.05 PROTECTION AND MAINTENANCE A. Protect and provide access as necessary to all settlement monitoring points and

geotechnical instruments installed by others. B. Keep protective access covers in place at all times other than during manual monitoring

and maintenance and keep access cover enclosures free of water and soil. C. Replacement instruments, components and readout units shall be available within 24

hours for repair and replacement of existing installed instrumentation. D. In the event of abnormal monitoring data or instrument damage, repair or replace the

affected instrument or components within 48 hours of detection at no additional cost to Seattle Public Utilities.



3.06 VIBRATION MONITORING A. Limit construction activities to the extent of controlling any vibrations transmitted through

the soil to any nearby houses, buildings, structures or adjacent utilities. B. Unless otherwise directed by the Engineer, the Contractor’s independent testing service

shall monitor vibration in the areas shown on the Drawings daily during construction activities, including, but not limited to, sheet pile installation, deep soil mix column installation and any other shoring installation and removal.

C. The locations of vibration monitors shown on the Drawings are approximate. The

Contractor shall install the instruments as close as practicable to the locations shown. The Contractor shall adjust locations for actual conditions in the field. The exact locations of the instruments shall be field-determined and shall be approved by the Engineer prior to installation.

D. The maximum allowable particle velocity at the nearest structure shall be limited to a

Peak Particle Velocity of 0.5-inch per second. Demonstrate that vibration levels are not being exceeded for each construction activity.

E. If the Peak Particle Velocity limit is exceeded, the Contractor shall immediately cease

the construction operation that is causing the vibration and notify the Engineer. The Contractor shall develop and submit a plan, to the Engineer, that describes how the work can proceed without exceeding the Peak Particle Velocity limit. Allow 48 hours for the review of the plan by the Engineer. The Contractor shall not resume the work that exceeded the Peak Particle Velocity threshold until receiving the Engineer’s approval of the revised work plan. The Contractor shall be responsible for the delay associated with the exceedance of the Peak Particle Velocity limit and developing the work plan. If the approved revised work plan does not reduce the Peak Particle Velocity to below the allowable limit, the Contractor shall cease all related operations contributing to the vibrations and repeat the process of developing a revised work plan and obtaining the Engineer’s approval. The Engineer’s approval of the revised work plan shall not alleviate the Contractor of the responsibility for conducting the work in a manner such that displacements or vibrations do not exceed the allowable limit.

3.07 PRE-CONSTRUCTION CONDITION A. In addition to videotape and photographs, prior to starting work in the area, complete a

detailed examination of each structure, which is required to have structure settlement points, as noted on the Drawings.

B. The detailed examination of each structure shall be performed by a Professional

Engineer registered in the state of Washington.

C. Include in the survey, scale drawings showing all existing cracks, sticking doors and windows and structural distress.

D. Measure and record all initial existing crack widths.



E. In the survey, place 2-dimensional plastic crack measuring templates, such as Avongard or similar, at critical and representative locations.

F. Document and submit the results of the pre-construction inspection in a bound volume with the seal of the responsible Professional Engineer on the title page.

G. The measurements of pre-existing cracks and settlements shall also be taken during and after construction.

END OF SECTION 31 09 13
