Naturally Occurring Asbestos

El Dorado Hills

Multimedia Exposure Assessment
Preliminary Assessment and Site Inspection Report Interim Final

El Dorado Hills Quick Finder
El Dorado Assessment Home 1.0 Introduction 2.0 Apparent Problem 3.0 Site Location, Description & History	4.0 Regulatory Involvement 5.0 Summary of Investigative Efforts 6.0 Hazard Ranking System Factors 7.0 Emergency Response Considerations	8.0 Summary Appendices References Acronyms Definitions Appendices & References

5.0 Summary of Investigative Efforts (cont'd)

5.4 Air Sampling

The START conducted activity-based air sampling according to the El Dorado Hills Naturally Occurring Asbestos Multimedia Exposure Assessment, El Dorado Hills, California, Activity-Based Outdoor Air Sampling of Community Park and Schools Field Sampling Plan and the El Dorado Hills Naturally Occurring Asbestos Multimedia Exposure Assessment, El Dorado Hills, California, Activity-Based Outdoor Air Sampling of Community Park Children’s Playground Field Sampling Plan. The types of activities the START conducted during activity-based outdoor air sampling included simulating work and play on baseball fields, soccer fields, basketball courts, playgrounds, and a hiking trail. Changes to these plans, if any, are noted in the discussion below.

The START conducted activity-based outdoor air sample collection at the following locations during 19 different activity-based sampling events or scenarios. These areas are illustrated on Figure 5-3 (Scenarios Location Map):

The New York Creek Nature Trail;
The New York Creek baseball playing field at the Community Park;
The north baseball playing field at the Community Park;
The south baseball playing field at the Community Park;
The (lower) soccer playing field between the north and south baseball playing fields at the Community Park;
The children’s playground at the Community Park;
The baseball playing field at Silva Valley Elementary School;
The basketball court area at Rolling Hills Middle School;
The soccer playing field at Rolling Hills Middle School;
Playing fields and paved play areas at Jackson Elementary School; and
The garden and outdoor classroom at Jackson Elementary School.

Members of the sampling team wore personal air monitoring pumps and Level C personal protective equipment while conducting activities within scripted scenarios to collect samples on air collection filter cassettes. The majority of the scenarios were designed to simulate primarily the activities of children, with simulation of adult activities as a small component. Some of the scenarios included simulation of only child activities, and some scenarios included simulation of only adult activities. Air collection filter cassettes were placed at a height of about 3 feet above ground surface to represent the breathing height of a child and about 5 feet above ground surface to represent the breathing height of an adult.

At each of the areas of concern the sampling team conducted the scenarios for the duration of the event, engaging in dust generation activities that could disturb asbestos fibers and release them into the air. The level of activity ranged from minimal to aggressive dust generation. Except as noted, the sampling team conducted each scenario for 2 hours. For all baseball and soccer scenarios, members of the sampling team who participated as players wore baseball cleats.

Table 5-4 New York Creek Nature Trail Perimeter Monitoring Air Sample Summary Results
Sample ID	Location	Location Description	Date	PCME Structures (s/cc)	AHERA-like Total Structures (s/cc)	Sensitivity (s/cc)
CC2-H8-1CT-100304	CC2-1CT	trail position #1CT hi-vol	10/03/04	0.000883	0.00353	0.000294
CC2-H8-2CT-100304	CC2-2CT	trail position #2CT hi-vol	10/03/04	0.000583	0.00321	0.000291
CC2-H8-3CT-100304	CC2-3CT	trail position #3CT hi-vol	10/03/04	<0.000892	0.00328	0.000298
CC2-H8-4CT-100304	CC2-4CT	trail position #4CT hi-vol	10/03/04	0.000830	0.00277	0.000277
CC2-H8-5CT-100304	CC2-5CT	trail position #5CT hi-vol	10/03/04	0.000955	0.00573	0.000955
TRA-H8-1TR-100904	TRA-1TRA	trail position #TRA1 hi-vol	10/09/04	0.000294	0.00118	0.000294
TRA-H8-11TR-100904	TRA-1TRA	duplicate of trail position #TRA1 hi-vol	10/09/04	<0.000867	<0.000867	0.000290
TRA-H8-2TR-100904	TRA-2TRA	trail position #TRA2 hi-vol	10/09/04	0.000286	0.000286	0.000286
TRA-H8-3TR-100904	TRA-3TRA	trail position #TRA3 hi-vol	10/09/04	<0.000881	<0.000881	0.000295
TRA-H8-4TR-100904	TRA-4TRA	trail position #TRA4 hi-vol	10/09/04	<0.000879	0.000879	0.000294
TRA-H8-5TR-100904	TRA-5TRA	trail position #TRA5 hi-vol	10/09/04	<0.000875	<0.000875	0.000293
TRA-H2-1ZP-100904	performance evaluation	performance evaluation	10/09/04	0.0380	0.313	0.00316
TRA-L2-1ZP-100904	performance evaluation	performance evaluation	10/09/04	0.252	1.21	0.0126
PCME fibers = fibers longer than 5 microns with a width between 0.25 and 3 microns, and an aspect ratio (length to width) greater than 3:1 AHERA-like total structures = structures longer than 0.5 microns with an aspect ratio greater than 3:1 (Note this differs somewhat from the strict AHERA structure definition) Sensitivity = the sample-specific lowest concentration of asbestos the laboratory can reliably detect s/cc = structures per cubic centimeter

Figure 5-3
Scenarios Location Map
(click image for larger version)

Activities within each scenario area were conducted by a specific number of people (either five, six, or seven, depending on the activity). When a member of the sampling team took a break from the activity, another member of the sampling team took his or her place in the scenario so that the number of people conducting scenario activities remained constant. The sample pumps and dust monitors were carried in removable work belts to facilitate the exchange of sampling team members as needed.

In addition to the personal air sample pumps worn by members of the sampling team, and except as noted, the START positioned several stationary air sample pumps within each scenario activity and upwind and downwind of scenario activity. For activity-based sampling scenarios conducted at the baseball playing fields at the Community Park, the START also positioned stationary sampling pumps at the Children’s Playground at the Community Park. The intakes for the air collection filter cassettes of the stationary sample pumps were set at a height of about 3 feet, except as noted.

Field conditions required the START to make several changes to the FSPs, most of which are related to the sampling schedule. Table 5-5 (Final Schedule of Field Work) shows the final sampling schedule as conducted.

Table 5-5 Final Schedule of Field Work
Date	Scenario 1	Scenario 2	Scenario 3	Reference Sample Areas
9/27/2005				Ambient Air Monitoring Station (AAMS)
9/28/2005				AAMS
9/29/2005				AAMS
9/30/2005				AAMS
10/1/2005	Rehearsal All Day and Press Availability 1:00 pm to 3:00 pm			AAMS, Southern Reference Area
10/2/2005	Silva Valley Baseball Field Maintenance	Silva Valley Baseball (A)		AAMS, Southern Reference Area
10/3/2005	Silva Valley Baseball (B)	Rolling Hills Soccer	Rolling Hills Basketball	AAMS, Southern Reference Area
10/3/2005	New York Creek Nature Trail 8-Hour Perimeter Sampling (CC2-#CT)			AAMS, Southern Reference Area
10/4/2005	Community Park Children's Playground - Typical Scenario	Community Park Children's Playground - Aggressive Scenario		AAMS, Southern Reference Area
10/5/2005	New York Creek Nature Trail Biking	Community Park Baseball North Field	Community Park Baseball South Field (A)	AAMS, Southern Reference Area
10/6/2005	New York Creek Nature Trail Jogging (A)	Community Park Baseball South Field (B)	Community Park Baseball South Field B without maintenance (C)	AAMS, Southern Reference Area
10/7/2005	New York Creek Nature Trail Jogging (B)	Community Park Baseball New York Creek Field	Community Park Soccer Lower Field	AAMS, Southern Reference Area
10/8/2005	Soil Sampling - Community Park, New York Creek Nature Trail			AAMS, Southern Reference Area
10/9/2005	Soil Sampling - Silva Valley Elementary School, Rolling Hills Middle School			AAMS, Northern Reference Area
10/9/2005	New York Creek Nature Trail 8-Hour Perimeter Sampling (TRA-#TR)			AAMS, Northern Reference Area
10/10/2005	Jackson School Garden and Outdoor Classroom	Jackson School Soccer	Jackson School Basketball and Kindergarten Play Area	AAMS, Northern Reference Area
10/11/2005	Soil Sampling - Dirt Parking Area			AAMS, Northern Reference Area
10/12/2005				AAMS