letter regarding blast monitoring work plan for …

GZA Engineers and

GeoEnvironmental Inc Scientists

September 11 1991 iiWi File No 30871-CPC

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Mr Mike Lavallee OTHER H J ^ X Rhode Island Solid Waste Management Corp oz RISWMC 65 Shun Pike Johnston RI 02919 469155 SDMS DocID

Re Blast Monitoring Work Plan for the Central Landfill 140 Broadway

Providence

Rhode Island 02903 Dear Mr Lavallee 401-421-4140

FAX 401-751-8613 In response to your letter request dated July 30 1991 to the Rhode Island Solid Waste Management Corporation GZA GeoEnvironmental Inc (GZA) has prepared this Blast Monitoring Work Plan for the rock excavation to take place in the Phase II and IH expansion areas of Central Landfill This Blast Monitoring Work Plan sets resultant peak particle velocity limitations and provides a description of the method of monitoring the blasting and potential impact to adjacent groundwater monitoring wells

BACKGROUND

This project includes the excavation of approximately 10000 cubic yards of bedrock using controlled blasting methods The objectives of this Blast Monitoring Work Plan are to limit the impacts of blasting on existing monitoring wells and bedrock hydraulic characteristics The monitoring program will consist of (1) performing rising head hydraulic conductivity tests on the closest of two wells near the blast site to assess bedrock hydraulic conductivity prior to and after blasting (2) obtaining water level readings at two nearby groundwater monitoring wells before and after blasting and (3) monitoring

A Subsidiary of GZA vibrations during the blasting operations GeoEnvironmental

Technologies Inc

HYDRAULIC CONDUCTIVITY TESTING OF MONITORING WELLS

For the monitoring well closest to blasting operations we propose to perform rising head slug tests to measure and monitor in-situ bedrock hydraulic conductivity The test involves an instantaneous change in the water level in the well through the removal of a volume of water (slug) and measuring the groundwater recovery of the well with respect to time

Copyrightreg 1991 GZA GeoEnvironmental Inc

An Equal Opportunicy Employer VlF- VH

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RISWMC September 11 1991 File No 30871-CPC Page 2

The wells targeted for hydraulic conductivity testing (WE87-11 and WE87-17) are still active in the quarterly groundwater sampling program currently taking place at the Central Landfill The introduction of water into the monitoring well (as in the falling head slug tests) may alter groundwater analytical results obtained in this sampling program and is therefore not recommended

The rising head test will be conducted by purging the well through the use of a portable pump after an initial groundwater reading has been taken After purging of the well is completed a record of groundwater recovery with time is compiled through the use of an electronic water level meter and a stopwatch A plot of field recovery data unrecovered head ratio (HHo) verses time (t) wiU be plotted on a semi-logarithmic scale From this plot the basic lag time can be determined and the Hvorslev method will be used to determine the hydraulic conductivity

The hydraulic conductivity tests will be conducted in one of two monitoring wells (WE87shy11 or WE87-17) that is closest to the blasting at the time of testing Hydraulic conductivity rates will be calculated in the field and communicated to Rhode Island Solid Waste Management Corporation (RISWMC) representatives We have provided a typical data sheet and a sample calculation from previous work in Appendix A Relevant monitoring well data is summarized below Figure 1 Central Landfill Blasting (Phase n and UI Expansion Areas) depicts the areas to be blasted and the wells to be monitored

In a report to RISWMC dated January 23 1990 GZA presented data which suggested that differences of up to one order of magnitude (ftday) would not adversely affect bedrock hydraulic properties Therefore GZA recommends that a guildline one of approximately one order of magnitude (ftday) of difference between observed in-situ bedrock hydraulic conductivity rates be utilized as the criteria for requiring changes in blasting techniques

TABLE 1 MONITORING WELL LOCATIONS AND ELEVATIONS

WELL FORMATION INSTALLED PVC NORTH EAST SCREENED ELEV COORD COORD

WE87-11 ROCK13 09-01-87 33147 26269760 48872119 (20ID) WE87-17 ROCK30 08-26-87 40070 26468934 48842172 (20ID) -

ozv

RISWMC September 11 1991 FUe No 30871-CPC Page 3

MEASUREMENT OF GROUNDWATER LEVELS

As part of the Blast Monitoring Work Plan GZA will obtain water level readings using a Solinst Electronic water level meter Typically water level readings will be obtained in the morning Additionally climatological data will be compUed to assess the effect that daily precipitation would have on the observed water levels From a review of the Rock Excavation Plan provided bytiie RISWMC it appears tiiat wells WE87-11 and WE87shy17 will be the weUs from which water level readings will be required The GZ88 series wells and well MW-D have been decommissioned

MONITORING OF RESULTANT PEAK PARTICLE VELOCmES

GZAs Blast Monitoring Work Plan involves measuring resultant peak particle velocities of blast induced vibrations and peak atmospheric overpressures which have been generated from on-site blasting The Resultant Peak Particle Velocity (RPPV) is a measurement of the speed of a single particle on a vibration wave as it rises from equilibrium to a crest and returns The RPPV is measured directiy by tiie instrument and is reported in inches per second

A Geosonics SU1(XK)DK seismograph wUl be used to measure and record ground movement in the three principal directions (vertical transverse and longitudinal) RPPV and peak atmospheric overpressure The seismograph will be set up at the well closest to the blasting A Geophone will be coupled to the ground surface adjacent to the well for the purpose of measuring vibrations and a microphone mounted on the seismograph will measure peak atmospheric overpressures A 5 second recording interval will be set which will allow a capture period of one second prior to the trigger and four seconds after the seismograph has been triggered The trigger value will initially be set at 007 inches per second but will be adjusted as conditions may dictate

The most generally accepted peak vibration criterion recommended by the Bureau of Mines is 20 inches per second for observed frequencies above 40 Hz This RPPV limit represents a probability type criterion for recommended safe vibration for a low probability of structural damage Construction and excavation blasting generally falls into this category of high frequency blasts Thus the 20 inches per second value is justified for high frequency blasts (measured wave frequencies gt40Hz) In developing our criterion we have referred to the results of reports prepared by the United States Department of the Interior and the Bureau of Mines studying blasting vibrations and their effects on structures

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We trust this information satisfies your current needs If you have any questions please do not hesitate to contact the undersigned at (401) 421-4140

Very truly yours

GZA GEOENVIRONMENTAL INC

5 A M 0 Thomas E BUlups PE A Sumnrcrly Senior Project Manager Proj$poundt Reviewer

David R Carchedi PE Associate Principal

TEBDRCbt

Enclosures

Rising Head Permeability Test Data Sheet Hvorslev Permeability Calculation Figure - Central Landfill Blasting (Phase n and HI Expansion)

REFERENCE

1 Siskind DD et al Structure Response and Damage Produced by Ground Vibration from Surface Mine Blasting United States Bureau of Mines Report of Investigation 8507 1980

2 Siskind DD et al Structure Response and Damage Produced by Airblast firom Surface Mining United States Bureau of Mines Report Investigation 8485 1980

3 Nicholls HR C F Johnson and W I Duvall Blasting Vibration and Their Effects on Structures Bureau of Mines BuUetin 656 1971 105 pp

RISING HEAD PERMEABUJTY TEST DATA SHEET

GZA GeoEnvironmental INC RISING HEAD PERMEABXLITY TEST DATA SHEET

PROJECT DATE

LOCATION WEATHER WELL NO GROUNDWATER ELEV PVC DATUM

ELAPSED DEPTH ELAPSED DEPTH TIME TO TIME TO

WATER WATER (SEC) (i-i) (SEC) (FT)

0

JOB NO _ ENGrNEER_ TEST NO

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COMMENTS


WAiER WAIER (SEC) (FL) (SEC) (FT)

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3 T3 O CENTRAL LANDFILL BUSTING c

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RISWMC September 11 1991 File No 30871-CPC

The wells targeted for hydraulic conductivity testing (WE87-11 and WE87-17) are still active in the quarterly groundwater sampling program currently taking place at the Central Landfill The introduction of water into the monitoring well (as in the falling head slug tests) may alter groundwater analytical results obtained in this sampling program and is therefore not recommended

The rising head test will be conducted by purging the well through the use of a portable pump after an initial groundwater reading has been taken After purging of the well is completed a record of groundwater recovery with time is compiled through the use of an electronic water level meter and a stopwatch A plot of field recovery data unrecovered head ratio (HHo) verses time (t) wiU be plotted on a semi-logarithmic scale From this plot the basic lag time can be determined and the Hvorslev method will be used to determine the hydraulic conductivity

The hydraulic conductivity tests will be conducted in one of two monitoring wells (WE87shy11 or WE87-17) that is closest to the blasting at the time of testing Hydraulic conductivity rates will be calculated in the field and communicated to Rhode Island Solid Waste Management Corporation (RISWMC) representatives We have provided a typical data sheet and a sample calculation from previous work in Appendix A Relevant monitoring well data is summarized below Figure 1 Central Landfill Blasting (Phase n and UI Expansion Areas) depicts the areas to be blasted and the wells to be monitored

In a report to RISWMC dated January 23 1990 GZA presented data which suggested that differences of up to one order of magnitude (ftday) would not adversely affect bedrock hydraulic properties Therefore GZA recommends that a guildline one of approximately one order of magnitude (ftday) of difference between observed in-situ bedrock hydraulic conductivity rates be utilized as the criteria for requiring changes in blasting techniques

TABLE 1 MONITORING WELL LOCATIONS AND ELEVATIONS

WELL FORMATION INSTALLED PVC NORTH EAST SCREENED ELEV COORD COORD

WE87-11 ROCK13 09-01-87 33147 26269760 48872119 (20ID) WE87-17 ROCK30 08-26-87 40070 26468934 48842172 (20ID) -

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Very truly yours




TEBDRCbt

Enclosures


REFERENCE






PROJECT DATE




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letter regarding blast monitoring work plan for …

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