Lead Report - AC-901579_Hwy-107.pdf

LEAD-BASED PAINT SURVEY

EMERGENCY RELIEF PROGRAM

LANDSLIDES & ROAD DAMAGES-EVALUATION AND REPAIRS (ER-HWY-107)

AC-901579

PR-124 KM 22.35, Lares, Puerto Rico 00669

Inspection Date: March 21, 2023

Prepared for: Puerto Rico Highway and Transportation Authority (PRHTA)

Prepared by: Nortol Environmental & Occupational Safety, Inc. on behalf of Barret, Hale & Alamo. LLC

Inspector:

Roberto Rodríguez Lead Inspector

LBP I.D. # LBPI-05422-074

Revision1: April 2023

NORTOL has performed this survey in a thorough and professional manner consistent with commonly accepted industry standards.

This document is intended only for the use of the individual or entity for which it was prepared and may contain information that is privileged, confidential and exempt from disclosure under applicable law. Any dissemination, distribution or copying of this document is strictly prohibited.

Lead-Based Paint Survey Emergency Relief Program | Landslides & Road Damage Evaluation (ER-HWY-107)

PR-124 Km 22.35, Lares, PR

Table of Contents

Acronyms ………………………………………………………….. 3

Introduction ………………………………………………………. 4

Lead Based Paint Survey Report ……………………….. 4

Lead Based Paint Findings

Survey Protocol and Sampling Procedures

LBP Background and Regulatory review

Conclusion ………..……………………………………………… 7

Inspector’s Certification ……………………………………… 7

Attachment 1 – Topographic/Location Map and Representative Pictures\Photograph Log

Attachment 2 – Company Credentials

Attachment 3 – Inspector’s Credentials

Attachment 4 – LBP XRF Tabulated Readings

Attachment 5 – Certification for Non-Presence LBP (PGC-010)

Attachment 6 – XRF Performance Characteristic Sheet

PR-124 Km 22.35, Lares, PR

Acronyms

A/C = Air Conditioning

CFR = Code of Federal Regulations

CPSC = Consumer Product Safety Commission

EPA = Environmental Protection Agency

Ft2 = square feet

HA = Homogeneous Area

HUD = Department of Housing and Urban Development

LBP = Lead-based Paint

LF = Linear Feet mg/cm2 = milligrams per square centimeter

NESHAP’S = National Emission Standards for Hazardous Air Pollutants

NIOSH = National Institute for Occupational Safety and Health

OSHA = Occupational Safety and Health Administration

PRDOH = Puerto Rico Department of Housing

PRDRNER = Puerto Rico Department of Natural and Environmental Resources

SOW = Scope of Work

XRF = X-Ray Fluorescent

I. INTRODUCTION

As part of the environmental due diligence, this survey is intended to assess the general presence, quantity, and location of Lead-based Paint and lead-glazed ceramic components above allowable levels at the Emergency Relief Program, Landslide & Road Damage Evaluation (ER-HWY-107) project located at PR-124 Km 22.35, Lares, P.R. See Topographic/Location Map in Attachment 1.

The LBP survey, conforming to Housing Urban Development (HUD) Guidelines for the Evaluation and Control of Lead Based Paint in Housing, was conducted on March 18, 2023, by Mr. Roberto Rodríguez (Lead inspector number: LBPI-05422-074) from Nortol. Copy of Nortol’s registration with the PRDNER as registered corporation is included in Attachment 2. Inspector’s credentials are included in Attachment 3. Nortol’s survey areas and report are limited to the details provided in Section II part D.

Based on the results of the survey, 31 XRF readings were performed using an XRF analyzer (model VIKEN PB200i-former HEURESIS with serial number 2705) on identified and accessible surfaces from the subject project. LBP was not identified above the regulatory level of 1.0 mg/cm2 in the SOW. See Attachment 4 for the assessed materials which includes pavement floor marks, barriers (parapets) and guardrails.

There is concrete, asphalt and metal components. The floors have asphalt pavement or bare soil.

II. LEAD BASED PAINT SURVEY REPORT

A. Lead Based Paint Findings:

LBP was not found in the project accessed components. The data from XRF analyzer testing is included in Attachment 4. Attachment 1 includes Representative Pictures\Photograph Log of the project. Certification for non-presence of lead-based paints or lead-glazes is provided in Attachment 5.

B. Survey Protocol and Sampling Procedure:

The survey was conducted following the HUD Guidelines for the Evaluation and Control of Lead- Based Paint Hazards in Housing (1997 Revision, Chapter 7). The technique used for assessing the painted components was the XRF instrument. The following guidelines were used to perform LBP testing:

1. Achieve inventory of painted surfaces.

2. Select areas to be assessed.

3. Perform XRF testing.

4. Review and evaluate the data.

5. Report findings

The XRF instrument was set at Standard Paint Mode showing reading “Positive” or “Negative” with a 95% confident reading. The result is reported in mg/cm2. Attachment 6 includes the XRF Performance Characteristic Sheet (PCS) of the analyzer. The letters A, B, C, and D used in the survey refers to:

A ⇒ Main entrance side orientation (to street) B ⇒ Left side orientation C ⇒ Rear side orientation D ⇒ Right side orientation

C. Lead Based Paint Background and Regulatory Review:

Overexposure to lead is one of the most common situations found in industry. It is also a major potential public health risk. Lead poisoning is the leading environmentally induced illness in children. At greatest risk are children under the age of six because they are undergoing rapid neurological and physical development. In general population, lead may be present at hazardous concentrations in food, water, and air. Sources include LBP, urban soil, dust, and drinking water.

Lead is commonly added to industrial paints because of its characteristic to resist corrosion.

Industries with particularly high potential exposures include construction work involving welding, cutting, brazing, blasting, etc., on lead paint surfaces; most smelter operations either as a trace contaminant or as a major product; secondary lead smelters where lead is recovered from batteries; radiator repair shops; and firing ranges. Oral ingestion may represent a major route of exposure in contaminated workplaces. Once in the blood, lead is distributed primarily among three routes - blood, soft tissue (kidney, bone marrow, liver, and brain) and mineralizing tissue (bones and teeth).

Hazard of lead in paint has been defined by the Department of Housing and Urban Development as 1.0 mg/cm2 as measured by an XRF instrument, or Atomic Absorption Spectroscopy (AAS); or 0.5% by weight (or 5,000 ppm) as measured by AAS, or Inductive Coupled Plasma (ICP). The same level was adopted by EPA regulations published in 1992, under Title X.

Although OSHA regulations for occupational lead exposure have been in effect since 1971 for the construction and general industries, the agency recognized the need to provide better protection and revised the regulations for general industry in 1978. The 1978 lead standard, however, excluded the construction industry from coverage because of insufficient information regarding lead use in construction.

In 1990, NIOSH set a national goal to eliminate worker exposures resulting in blood lead concentrations greater than 25 micrograms per deciliter (25 µg/dl) of whole blood. Consequently, OSHA began developing a proposal for a comprehensive standard regulating occupational exposure to lead in construction. In October 1992, the Congress passed Section 1031 of Title X of the Housing and Community Development Act of 1992 (P. L. 102-550) requiring OSHA to issue an interim final lead standard for the construction industry, effective until OSHA issues a final standard. The interim final rule, published on May 4, 1993, amends the OSHA standards for occupational health and environmental controls in Subpart D of Title 29 CFR 1926 by adding a new section 1926.62, containing employee protection requirements for construction workers exposed to lead.

On July 1998, the PRDNER (former PR Environmental Quality Board) regulations regarding to LBP was created to issue activity permits, accredit institutions, and certificate persons involved in LBP activities in Puerto Rico. Local regulations require all lead to be managed as a special waste. On August 2019 this regulation was replaced by the new Reglamento para el Manejo Adecuado de Actividades de Pintura con Base de Plomo. To obtain a demolition permit in Puerto Rico is necessary to include a certification (OGP-PGC-010 or equivalent) stating that there is no LBP in the project.

D. Survey Areas – Extent of Survey Coverage:

The survey included a detailed structure inspection providing a general sense of the overall location, type, quantity, and condition of LBP and LBP ceramic components. The LBP survey was performed to ready accessible components and surfaces. If any suspect coated surface or ceramic components, that could contain lead, are encountered underneath current installed tiles or other construction material during demolition and/or renovation activities, which differ from materials tested during the LBP survey, these should be assumed to be Lead containing until testing/analysis confirmed otherwise. The survey was unobtrusive as samples were not taken where doing so would have resulted in objectionable damage to surfaces. Therefore, the survey did not include destructive, intrusive and/or exploratory testing.

Areas Not Included in Survey and Service Constraints: All professional opinions presented in this report are based on information made available either by review of data provided by others or data gathered by Nortol personnel. Nortol affirms that data gathered and presented by Nortol in this report was collected in an appropriate manner in accordance with accepted methods and practices. Any energized utilities/services, including electricity, water and heat were assumed to be active. Materials associated with these items were determined to not be safely accessible and were not sampled. The survey did not include access or inspection of confined spaces or subsurface/underground areas including piping, conduits, building footings and soils (surficial or otherwise).

III. CONCLUSION

LBP survey was conducted for the project identified with the header ID. LBP or lead-glaze was not identified above the regulatory level of 1.0 mg/cm2 at the subject structure. In addition, lead containing ceramic components were not identified to contain lead above the regulatory level.

Data from XRF analyzer testing results is included in Attachment 3. Attachment 4 includes Representative Pictures\Photograph Log of the structure. Certification for non-presence of lead-based paints or lead-glazes is provided in Attachment 5.

Any conditions or materials that could not be visually identified or were out-of-the SOW, was not inspected and may differ from those conditions or materials noted. It was not within the scope of the activity to remove surface materials to investigate portions of the structure or materials that may lay beneath the surface. Nortol’s selection of sample locations and frequency of sampling was based on Nortol’s observations and the assumption that similar materials in the same area are homogeneous in content.

The report is designed to aid the building owner, architect, construction manager, general contractors, and potential asbestos or lead abatement contractors in locating LBP or lead-glaze.

Under no circumstances is the report to be utilized solely as a bidding document or as a project specification document.

IV. LEAD-BASED PAINT ASSESSMENT REPORT CERTIFICATION

I certify that the subject project was done in accordance with current applicable regulations (i.e., PRDNER, HUD, USEPA) and that the information included in this report is true.

Inspector: Roberto Rodríguez

LBP I.D. # LBPI-05422-074

See Attachments for personnel, company, and instrument’s certifications.

Attachment 4. Attachment 1

Attachment 1 Topographic/Location Map and Representative

Pictures\Photograph Log

LANDSLIDE & ROAD DAMAGE EVALUATION (ER-

HWY-107) PR-124 KM 22.35 - LBP SURVEY PHOTO LOG

Tuesday, March 21, 2023

Prepared For Barrett, Hale, Alamo

PR-124 Km 22.35 Lares, PR 00669

Roberto Rodríguez Rodríguez

NORTOL Environmental & Occupational Safety, Inc.

FRONT VIEW:

(18.2687107, -66.8990561)

LOCATION:

(18.2687107, -66.8990561)

SCOPE OF WORK:

Full inspection A/L.

1 2

EXTERIOR GENERAL VIEW SIDE A:

EXTERIOR GENERAL VIEW SIDE B:

1 2

1 2

Showed and assessed components are asphalt pavement floor marks and concrete barriers-parapets.

LANDSLIDE & ROAD DAMAGE EVALUATION (ER-HWY-107) PR-124 KM 22.35 LARES PR

Pictures from the components assessed for Lead-based paints (LBP).

Showed and assessed components are asphalt pavement floor marks, concrete barriers-parapets and metal guardrails.

EXTERIOR GENERAL VIEW SIDE C:

EXTERIOR GENERAL VIEW SIDE D:

1 2

1 2

LANDSLIDE & ROAD DAMAGE EVALUATION (ER-HWY-107) PR-124 KM 22.35 LARES PR

Pictures from the components assessed for Lead-based paints (LBP).

Showed and assessed components are concrete barriers-parapets and metal guardrails.

Showed and assessed components are asphalt pavement floor marks, concrete barriers-parapets and metal guardrails.

EXTERIOR GENERAL VIEWS:

LBP DETECTED?

No LBP detected at the moment of the inspection.

1 2

3 4

LANDSLIDE & ROAD DAMAGE EVALUATION (ER-HWY-107) PR-124 KM 22.35 LARES PR

Pictures from the components assessed for Lead-based paints (LBP).

Showed and assessed components are asphalt pavement floor marks, concrete barriers-parapets and metal guardrails.

Attachment 2 Company Credentials

Attachment 3 Inspector’s Credentials

Certificate of Training Has completed the Heuresis Corp. training materials presented on the topic of

Instrument Operator Training, Pb200i, with regards to the materials licensed by the Commonwealth of Massachusetts and the Nuclear Regulatory Commission.

Instrument Operator Training

Heuresis Corporation, Pb200i

I confirm that the above named individual has received the training listed on this certificate.

Adam Robison March 2nd, 2021 Name Date

Senior Director of Sales Title

I certify that I have received the stated training and understand the content presented. I understand that I can follow up this training with questions from Heuresis Corporation.

Roberto Rodriguez March 2nd, 2021 Name Date

Attachment 4 LBP XRF Tabulated Readings

Company Model Type

Serial Num.

App Version

Job Id Reading # Concentration Units Result Level Date Time Inspector Job Room Structure Component Substrate Side Color Condition Approx. QTY

- 151 1 mg/cm2 Positive 1 3/21/2023 13:07:51 R.RODRIGUEZ - - Calibration - - - - - -

- 152 1 mg/cm2 Positive 1 3/21/2023 13:08:05 R.RODRIGUEZ - - Calibration - - - - - -

- 153 1.1 mg/cm2 Positive 1 3/21/2023 13:08:19 R.RODRIGUEZ - - Calibration - - - - - -

MAIN ROAD 154 0 mg/cm2 Negative 1 3/21/2023 13:11:11 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete A Gray Deteriorated -

MAIN ROAD 155 0.1 mg/cm2 Negative 1 3/21/2023 13:11:18 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete A Gray Deteriorated -

MAIN ROAD 156 0 mg/cm2 Negative 1 3/21/2023 13:11:28 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete A Gray Deteriorated -

MAIN ROAD 157 0.1 mg/cm2 Negative 1 3/21/2023 13:11:41 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete C Gray Deteriorated -

MAIN ROAD 158 0 mg/cm2 Negative 1 3/21/2023 13:11:59 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete C Gray Deteriorated -

MAIN ROAD 159 0.1 mg/cm2 Negative 1 3/21/2023 13:12:07 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete C Gray Deteriorated -

MAIN ROAD 160 0.5 mg/cm2 Negative 1 3/21/2023 13:12:49 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete C Yellow Deteriorated -

MAIN ROAD 161 0.4 mg/cm2 Negative 1 3/21/2023 13:12:56 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete C Yellow Deteriorated -

MAIN ROAD 162 0 mg/cm2 Negative 1 3/21/2023 13:13:49 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete A Yellow Deteriorated -

MAIN ROAD 163 0 mg/cm2 Negative 1 3/21/2023 13:13:57 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete A Yellow Deteriorated -

MAIN ROAD 164 0.2 mg/cm2 Negative 1 3/21/2023 13:14:34 R.RODRIGUEZ 100-196 Exterior Street Floor Mark Asphalt - White Deteriorated -

MAIN ROAD 165 0.2 mg/cm2 Negative 1 3/21/2023 13:14:46 R.RODRIGUEZ 100-196 Exterior Street Floor Mark Asphalt - White Deteriorated -

MAIN ROAD 166 0.4 mg/cm2 Negative 1 3/21/2023 13:15:15 R.RODRIGUEZ 100-196 Exterior Street Guardrail Metal C Mostly Unpainted Deteriorated -

MAIN ROAD 167 0.4 mg/cm2 Negative 1 3/21/2023 13:15:27 R.RODRIGUEZ 100-196 Exterior Street Guardrail Metal C Mostly Unpainted Deteriorated -

MAIN ROAD 168 0.4 mg/cm2 Negative 1 3/21/2023 13:15:33 R.RODRIGUEZ 100-196 Exterior Street Guardrail Metal C Mostly Unpainted Deteriorated -

MAIN ROAD 169 0.1 mg/cm2 Negative 1 3/21/2023 13:16:13 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete C Gray Deteriorated

MAIN ROAD 170 0 mg/cm2 Negative 1 3/21/2023 13:16:20 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete C Yellow Deteriorated

MAIN ROAD 171 0 mg/cm2 Negative 1 3/21/2023 13:16:26 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete C Yellow Deteriorated

MAIN ROAD 172 0 mg/cm2 Negative 1 3/21/2023 13:16:32 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete A Yellow Deteriorated

MAIN ROAD 173 0 mg/cm2 Negative 1 3/21/2023 13:16:39 R.RODRIGUEZ 100-196 Exterior Street Barrier Concrete A Yellow Deteriorated

MAIN ROAD 174 0 mg/cm2 Negative 1 3/21/2023 13:16:45 R.RODRIGUEZ 100-196 Exterior Street Floor Mark Asphalt - White Deteriorated

MAIN ROAD 175 0 mg/cm2 Negative 1 3/21/2023 13:16:51 R.RODRIGUEZ 100-196 Exterior Street Floor Mark Asphalt - White Deteriorated

MAIN ROAD 176 0.1 mg/cm2 Negative 1 3/21/2023 13:16:58 R.RODRIGUEZ 100-196 Exterior Street Guardrail Metal C Mostly Unpainted Deteriorated

MAIN ROAD 177 0 mg/cm2 Negative 1 3/21/2023 13:17:04 R.RODRIGUEZ 100-196 Exterior Street Guardrail Metal C Mostly Unpainted Deteriorated

MAIN ROAD 178 0.1 mg/cm2 Negative 1 3/21/2023 13:17:11 R.RODRIGUEZ 100-196 Exterior Street Guardrail Metal C Mostly Unpainted Deteriorated

- 179 1.1 mg/cm2 Positive 1 3/21/2023 13:17:27 R.RODRIGUEZ - - Calibration - - - - - -

- 180 1.1 mg/cm2 Positive 1 3/21/2023 13:17:42 R.RODRIGUEZ - - Calibration - - - - - -

- 181 1 mg/cm2 Positive 1 3/21/2023 13:17:56 R.RODRIGUEZ - - Calibration - - - - - -

DUPLICATED READING

LANDSLIDE & ROAD DAMAGE EVALUATION (ER-HWY-107) PR-124 KM 22.35 XRF SHEET

Heuresis Corp.

Pb200i XRF Lead Paint Analyzer

Pb200i-5.2.0

Attachment 5 Certification for Non-Presence LBP

Forma PGC-010

GOBIERNO DE PUERTO RICO

OFICINA DEL GOBERNADOR

JUNTA DE CALIDAD AMBIENTAL

Área de Calidad de Agua

CERTIFICACION DE NO PRESENCIA DE PINTURA CON BASE DE PLOMO

EN ESTRUCTURAS A DEMOLERSE

(Deberá completarse en letra de molde o impresa)

PGC-_____________________

PARA USO OFICIAL

SUBMITTED AS SEPARATE

DOCUMENT

Attachment 6 XRF Performance Characteristic Sheet

HEURESIS PCS September 2022

Performance Characteristic Sheet

EFFECTIVE DATE: September 1, 2022

MANUFACTURER AND MODEL:

Make: Heuresis

Models: Model Pb200i, Pb200e

Source: 57Co, 5 mCi (nominal – new source)

FIELD OPERATION GUIDANCE

OPERATING PARAMETERS:

Action Level 1.0 mg/cm2

XRF CALIBRATION CHECK LIMITS:

0.8 to 1.2 mg/cm2 (inclusive)

SUBSTRATE CORRECTION:

Not applicable

INCONCLUSIVE RANGE OR THRESHOLD:

ACTION LEVEL MODE

READING DESCRIPTION

SUBSTRATE THRESHOLD (mg/cm2)

Results not corrected for substrate bias on any substrate

Brick 1.0 Concrete 1.0 Drywall 1.0 Metal 1.0

Plaster 1.0 Wood 1.0

BACKGROUND INFORMATION

EVALUATION DATA SOURCE AND DATE:

This sheet is supplemental information to be used in conjunction with Chapter 7 of the HUD Guidelines for the

Evaluation and Control of Lead-Based Paint Hazards in Housing ("HUD Guidelines"). Performance parameters shown on this sheet are calculated using test results on building components in the HUD archive. Testing was conducted on 146 test samples in November 2015, with two separate instruments running software version 2.1-2 in Action Level test mode. The actual source strength of each instrument on the day of testing was approximately

2.0 mCi; source ages were approximately one year.

OPERATING PARAMETERS

Performance parameters shown in this sheet are applicable only when properly operating the instrument using the manufacturer's instructions and procedures described in Chapter 7 of the HUD Guidelines.

XRF CALIBRATION CHECK:

The calibration of the XRF instrument should be checked using the paint film nearest 1.0 mg/cm2 in the NIST

Standard Reference Material (SRM) used (e.g., for NIST SRM 2579, use the 1.02 mg/cm2 film).

If the average (rounded to 1 decimal place) of three readings is outside the acceptable calibration check range, follow the manufacturer's instructions to bring the instrument into control before XRF testing proceeds.

SUBSTRATE CORRECTION VALUE COMPUTATION:

Chapter 7 of the HUD Guidelines provides guidance on correcting XRF results for substrate bias. Supplemental guidance for using the paint film nearest 1.0 mg/cm2 for substrate correction is provided:

XRF results are corrected for substrate bias by subtracting from each XRF result a correction value determined separately in each house for single-family housing or in each development for multifamily housing, for each substrate. The correction value is an average of XRF readings taken over the NIST SRM paint film nearest to 1.0 mg/cm2 at test locations that have been scraped bare of their paint covering. Compute the correction values as follows:

Using the same XRF instrument, take three readings on a bare substrate area covered with the NIST

SRM paint film nearest 1 mg/cm2. Repeat this procedure by taking three more readings on a second bare substrate area of the same substrate covered with the NIST SRM.

Compute the correction value for each substrate type where XRF readings indicate substrate correction is needed by computing the average of all six readings as shown below.

For each substrate type (the 1.02 mg/cm2 NIST SRM is shown in this example; use the actual lead loading of the NIST SRM used for substrate correction):

Correction value = (1st + 2nd + 3rd + 4th + 5th + 6th Reading)/6 - 1.02 mg/cm2

Repeat this procedure for each substrate requiring substrate correction in the house or housing development.

EVALUATING THE QUALITY OF XRF TESTING:

Randomly select ten testing combinations for retesting from each house or from two randomly selected units in multifamily housing.

Conduct XRF re-testing at the ten testing combinations selected for retesting.

Determine if the XRF testing in the units or house passed or failed the test by applying the steps below. Compute the Retest Tolerance Limit by the following steps:

Determine XRF results for the original and retest XRF readings. Do not correct the original or retest results for substrate bias. In single-family and multi-family housing, a result is defined as a single reading. Therefore, there will be ten original and ten retest XRF results for each house or for the two selected units.

Calculate the average of the original XRF result and the retest XRF result for each testing combination.

Square the average for each testing combination.

Add the ten squared averages together. Call this quantity C.

Multiply the number C by 0.0072. Call this quantity D.

Add the number 0.032 to D. Call this quantity E.

Take the square root of E. Call this quantity F.

Multiply F by 1.645. The result is the Retest Tolerance Limit.

Compute the average of all ten original XRF readings.

Compute the average of all ten re-test XRF readings.

Find the absolute difference of the two averages.

If the difference is less than the Retest Tolerance Limit, the inspection has passed the retest. If the difference of the overall averages equals or exceeds the Retest Tolerance Limit, this procedure should be repeated with ten new testing combinations. If the difference of the overall averages is equal to or greater than the Retest Tolerance Limit a second time, then the inspection should be considered deficient.

Use of this procedure is estimated to produce a spurious result approximately 1% of the time. That is, results of this procedure will call for further examination when no examination is warranted in approximately 1 out of 100 dwelling units tested.

TESTING TIMES:

In the Action Level paint test mode, the instrument takes the longest time to complete readings close to the Federal standard of 1.0 mg/cm2. The table below shows the mean and standard deviation of actual reading times by reading level for paint samples during the November 2015 archive testing. The tested instruments reported readings to one decimal place. No significant differences in reading times by substrate were observed. These times apply only to instruments with the same source strength as those tested (2.0 mCi). Instruments with stronger sources will have shorter reading times and those with weaker sources, longer reading times, than those in the table.

Mean and Standard Deviation of Reading Times in Action Level Mode by Reading Level

(Seconds) Reading (mg/cm2) Mean Reading Time (seconds)

SS(Seconds)((se(seconds)(se conds)

Standard Deviation (seconds)

< 0.7 3.48 0.47

0.7 7.29 1.92

0.8 13.95 1.78

0.9 – 1.2 15.25 0.66

1.3 – 1.4

6.08 2.50

> 1.5 3.32 0.05

CLASSIFICATION OF RESULTS:

XRF results are classified as positive if they are greater than or equal to the stated threshold for the instrument (1.0 mg/cm2), and negative if they are less than the threshold.

DOCUMENTATION:

A report titled Methodology for XRF Performance Characteristic Sheets (EPA 747-R-95-008) provides an explanation of the statistical methodology used to construct the data in the sheets, and provides empirical results from using the recommended inconclusive ranges or thresholds for specific XRF instruments. The report may be downloaded at http://www2.epa.gov/lead/methodology-xrf-performance-characteristic-sheets-epa-747-r-95-

008-september-1997.

This XRF Performance Characteristic Sheet (PCS) was developed by QuanTech, Inc., under a contract with the

XRF manufacturer.

http://www2.epa.gov/lead/methodology-xrf-performance-characteristic-sheets-epa-747-r-95-008-september-1997 http://www2.epa.gov/lead/methodology-xrf-performance-characteristic-sheets-epa-747-r-95-008-september-1997 www.nortolpr.com | info@nortolpr.com | 787.420.0220 PO Box 366457, San Juan, PR 00936-6457

LBP Limited Survey Report-Pavement Rehabilitation and Safety Improvements- PR-165A (KM 15 AL KM 30)