A05_-_PWS_-_Attachment__1_-_25241_2001_10_19_Recon_Rprt.pdf

DRAFT

VILLAGE OF NAPASKIAK SITE

RECONNAISSANCE PROJECT REPORT

NAPASKIAK, ALASKA

October 19, 2001

Prepared for the Alaska Department of Environmental Conservation by

Prepared by: ______________________ Karl Hill Project Manager

Reviewed by: ______________________ Max W. Schwenne Contract Manager

Village of Napaskiak Site Reconnaissance ADEC UST Program

H:\2001 UST-AST Term Contract\Napaskiak\Draft Report.doc 10/19/01 ii

TABLE OF CONTENTS

EXECUTIVE SUMMARY ................................................................................................ iii

2 INTRODUCTION TO PROJECT

2.1 PROJECT MANAGER

2.2 FIELD PERSONNEL

2.3 LOGISTICS OF PROJECT

3 OBJECTIVES OF INVESTIGATION

3.1 PURPOSE

3.2 STRUCTURE

3.3 ADEC CLEANUP LEVELS UTILIZED

4 VILLAGE SUMMARY

4.1 GENERAL INFORMATION

4.1.1 Village History

4.1.2 Location

4.2 MAPS

4.2.1 State Location Map

4.2.2 Vicinity Map

4.2.3 Aerial Photos

4.3 VILLAGE CONTACTS

4.4 EQUIPMENT IN VILLAGE

4.5 RESIDENTS WITH 40-HOUR TRAINING

4.6 VILLAGE WATER SUPPLIES

4.7 SOURCE MATERIAL SITES

4.8 LANDFILLS

4.9 SUBSISTENCE AND RECREATIONAL AREAS

5 SITE INFORMATION

5.1 SITE 1: Z. JOHN WILLIAMS SCHOOL TANK FARM

5.1.1 Site Map/Drawing

5.1.2 Site Description

5.1.3 Site Reconnaissance

5.1.4 Analytical Results

5.1.5 Discussion and Recommendations

iii

5.2 SITE 2: NAPASKIAK ELECTRIC UTILITY TANK FARM

5.2.1 Site Map/Drawing

5.2.2 Site Description

5.2.3 Site Reconnaissance

5.2.4 Analytical Results

5.2.5 Discussion and Recommendations

5.3 SITE 3: NAPASKIAK INCORPORATED STORE

5.3.1 Site Map/Drawing

5.3.2 Site Description

5.3.3 Site Reconnaissance

5.3.4 Analytical Results

5.3.5 Discussion and Recommendations

5.4 SITE 4: NAPASKIAK INCORPORATED STORE TANK FARM (FORMER

LOCATION)

5.4.1 Site Map/Drawing

5.4.2 Site Description

5.4.3 Site Reconnaissance

5.4.4 Analytical Results

5.4.5 Discussion and Recommendations

5.5 SITE 5: BIA SCHOOL DAY TANKS (FORMER LOCATION)

5.5.1 Site Map/Drawing

5.5.2 Site Description

5.5.3 Site Reconnaissance

5.5.4 Analytical Results

5.5.5 Discussion and Recommendations

6 DATA VALIDATION SUMMARY

7 SUMMARY TABLE OF SITES

LIST OF TABLES

1 Analytical Results Summary for DRO/RRO and GRO/BTEX 2 Analytical Results Summary for PAH iv

LIST OF FIGURES

1 Site Location Map 2 Site Vicinity Map 3 Site Map for Site #1 4 Site Map for Site #2 5 Site Map for Site #3 6 Site Map for Site #4 7 Site Map for Site #5

APPENDICES

Appendix A Field Notes Appendix B Photo Log Appendix C Chain-of-Custody and Laboratory Analytical Results iii

1 EXECUTIVE SUMMARY

A site investigation was performed at five current and former bulk fuel storage tank farms and related facilities in Napaskiak, Alaska in September 2001. The purpose of the investigation was to document the presence or absence of contamination at the facilities and provide sufficient information to develop site assessment work plans if necessary.

Contamination exceeding 18AAC75 Method Two cleanup levels for the Arctic Zone was identified at two of the five sites in the Village of Napaskiak. The two sites where contamination was encountered are both inactive sites that no longer have bulk fuel storage tanks. Contamination exceeding 18AAC75 Method Two cleanup levels for the Arctic Zone were not encountered at any of the three active bulk fuel storage facilities.

DRO and GRO/BTEX contamination in excess of cleanup levels was encountered at the former location of the Napaskiak Incorporated Store bulk fuel storage facility. Inspection of the laboratory analytical chromatograms for the samples collected in this location also indicates the presence of an unknown volatile contaminant in the soil. The former location of the bulk fuel storage facility is just north of the Z. John Williams School. The stained area at this location is approximately 200 ft2, and extends vertically at least three feet below ground surface (bgs). OASIS recommends further assessment of this site.

The other site where contamination exceeded 18AAC75 Method Two Arctic Zone cleanup levels was the former location of the day tanks for the BIA School and utility building. Concentrations of DRO at this location exceed cleanup levels. The stained area at this location covers approximately 115 ft2, and extends vertically at least three feet below ground surface (bgs). OASIS recommends further assessment of this site.

Analytical results from samples collected at the three currently active fuel facilities (Z.

John Williams School, Napaskiak Electric Utility, and Napaskiak Incorporated Store) indicate low levels of DRO and RRO. The areas surrounding these tank farms are marshy wetland areas with highly organic soils. Inspection of laboratory analytical chromatograms of the samples collected from these areas indicate that the DRO and RRO levels encountered are most probably biogenic in nature and not associated with a fuel spill. OASIS does not recommend further assessment at any of the three active bulk fuel storage sites.

2 INTRODUCTION TO PROJECT

OASIS Environmental, Inc. (OASIS) performed a site reconnaissance of five current and former fuel facilities, located in Napaskiak, Alaska (Figure 1) during September 2001.

The Alaska Department of Environmental Conservation (ADEC) authorized OASIS to perform this work under Contract 18-5001-12 in accordance with the approved work plan. Notice to proceed for this project was received from the ADEC under NTP# 1850011205 on July 30, 2001.

This report describes the field activities and results from the environmental site reconnaissance at five fuel facility sites at the Village of Napaskiak.

2.1 PROJECT MANAGER

The project manager for the Village of Napaskiak site reconnaissance was Karl Hill.

2.2 FIELD PERSONNEL

Field personnel for this project included Karl Hill and Lisa Nicholson for soil sampling, hand excavation of test pits, and interviewing local residents and fuel facility operators.

2.3 LOGISTICS OF PROJECT

The Napaskiak site reconnaissance was done in conjunction with the Tununak site reconnaissance. The Tununak site reconnaissance was completed first. The OASIS field team, along with sampling and field equipment traveled from Tununak to Napaskiak via an Arctic Circle Air charter plane.

Upon arrival at Napaskiak, the OASIS field personnel walked to the school to contact a resident who had previously agreed to rent OASIS an ATV. OASIS personnel were informed that the resident no longer wished to rent them the ATV. Z. John Williams School personnel agreed to let OASIS use their ATV to transport sampling and field equipment from the airport to the school. Site assessment activities in Napaskiak were performed without an ATV. Accommodations for OASIS field personnel were provided by the Lower Kuskokwim School District at Z. John Williams School.

Upon completion of the fieldwork for the project, OASIS field personnel and equipment traveled from Napaskiak to Bethel on an Arctic Circle Air charter. Travel back to Anchorage was completed on Alaska Airlines. Arctic Circle Air personnel shipped the field equipment to Anchorage via Northern Air Cargo.

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3 OBJECTIVES OF INVESTIGATION

The main objective of this reconnaissance was to collect enough site data from each of the fuel facility sites to develop a complete site assessment work plan and cost proposal for existing and former AST sites in the village of Napaskiak, Alaska. The goals of the reconnaissance effort include collection and analysis of environmental samples to confirm the absence or presence of contaminated soil in potentially contaminated locations at current and former fuel facilities; establishment of good rapport with the village residents; collection of firsthand historic spill site information; and verification of anecdotal information by performing personal interviews, inspecting the sites, and performing historic document reviews.

3.1 PURPOSE

To conduct a site investigation and assess active and abandoned bulk fuel storage facilities and pipelines in the village of Napaskiak, Alaska. The information gathered during the reconnaissance will be used to develop a full site assessment work plan and cost proposal, and evaluate the need for remediation.

3.2 STRUCTURE

The structure of this reconnaissance report follows the outline set forth in the RFP for environmental services for the village of Beaver.

3.3 ADEC CLEANUP LEVELS UTILIZED

OASIS recommends use of 18AAC75 Method Two Arctic Zone cleanup levels for determining soil cleanup levels for the Village of Napaskiak. The Napaskiak area is primarily underlain by permafrost, so migration to groundwater should not be considered a contaminant pathway.

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4 VILLAGE SUMMARY

Napaskiak is a predominantly Yup’ik Eskimo village located on the east bank of the Kuskokwim River. Census results from 2000 indicate that there are approximately 360 residents of the village. Almost all residents of the village participate in subsistence hunting and fishing activities throughout the year. Access is via boat or small airplane in the summer and snowmobile or small airplane in the winter.

4.1 GENERAL INFORMATION

4.1.1 Village History

The area has historically been occupied by Yup'ik Eskimos. The U.S. Coast & Geodetic Survey first reported Napaskiak in 1867. The 1880 U.S. Census reported a population of

196. By 1890, the numbers had dropped to 97, and were as low as 67 in 1939. The City was incorporated in 1971.

4.1.2 Location

Napaskiak is located on the east bank of the Kuskokwim River, along the Napaskiak Slough, 7 miles southeast of Bethel. It lies at approximately 60d 42m N Latitude, 161d 54m W Longitude. (Sec. 08, T007N, R071W, Seward Meridian.) Napaskiak is located in the Bethel Recording District. The area encompasses 3.5 sq. miles of land and .4 sq.

miles of water. Napaskiak is strongly influenced by storms and patterns in the Bering Sea and also by inland continental weather. Average annual precipitation is 16 inches, with 50 inches of snowfall. Summer temperatures range from 42° to 62°F, winter temperatures typically range from -2° to 19°F.

4.2 MAPS

Maps of the reconnaissance sites and surrounding areas are provided as discussed below.

4.2.1 State Location Map

A state location map is provided as an inset to Figure 1.

4.2.2 Vicinity Map

Figure 2 is an aerial photo showing major features of the village and its vicinity including items such as bulk fuel storage areas, structures and areas of interest, and the landing strip location.

4.2.3 Aerial Photos

The June 1996 aerial photograph of Napaskiak, Alaska is provided in color form in Figure 2.

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4.3 VILLAGE CONTACTS

Village contacts and telephone numbers are summarized in the following table.

Table 4-1: Village Contacts Name/Title Association/ Company Telephone Number

Philip Nicholai, CEO

Napaskiak, Inc. (village corporation)

737-7433

Elinor Okoviak, Mayor

City of Napaskiak 737-7626

Chris Larson, Chief Native Village of Napaskiak (traditional council)

737-7364

Gloria Ingle, Administrator

Z. John Williams School 737-7212

Jackie Larson, Manager

Napaskiak Incorporated Store

737-7413

Joseph Steven, Manager

Napaskiak Utility 737-7432

Ivan Maxie, Facility Operator

Napaskiak Utility 737-8776

Walter Johnson Jr., Facility Operator

Napaskiak Utility 544-4659

4.4 EQUIPMENT IN VILLAGE

Heavy equipment for rent in the village includes a John Deere 450H dozer. The dozer is new and owned by the village council. ATVs and trailers are also available to rent from various community members.

4.5 RESIDENTS WITH 40-HOUR TRAINING

OASIS did not identify any residents who had completed 40-Hour HAZWOPER training.

Residents that were interviewed did not know of anyone who had a list of individuals that were trained. Several of the Napaskiak Electric Utility operators are scheduling 40-hour training to be completed this year.

4.6 VILLAGE WATER SUPPLIES

Potable water is supplied to the village by wells in two locations. One watering point is located on the west side of the village, and the other is on the eastern end of the village.

An additional well serves the school. Well locations are indicated on Figure 2.

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4.7 SOURCE MATERIAL SITES

There are no sources of gravel fill in Napaskiak. When fill is required for a project, it is delivered by barge from fill locations along the Kuskokwim River.

4.8 LANDFILLS

The landfill that is currently used by the Village of Napaskiak is an un-permitted landfill located on the southern edge of town.

4.9 SUBSISTENCE AND RECREATIONAL AREAS

Subsistence fishing and hunting are important sources of food for the residents of Napaskiak. Fishing, hunting, and berry picking for subsistence use is normally done away from the village. Boats are used to access hunting and fishing areas either upriver or downriver from the village.

The main recreational areas in town appear to be the area around the Napaskiak Incorporated Store, the Z. John Williams School, and along the boardwalks throughout the village.

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5 SITE INFORMATION

OASIS identified five sites in the Village of Napaskiak. The sites are listed below:

• Site 1: Z. John Williams School Tank Farm,

• Site 2: Napaskiak Utility Tank Farm,

• Site 3: Napaskiak, Inc. Store Tank Farm,

• Site 4: Napaskiak, Inc. Store Tank Farm (Former Location), and

• Site 5: BIA School Day Tanks (Former Location).

A second tank farm at the Z. John Williams School (800-gallon capacity) was indicated in the Request for Proposal for this project, but was not located by OASIS personnel.

The fuel facility operator for the school was not aware of the presence of an 800-gallon tank belonging to the school.

5.1 SITE 1: Z. JOHN WILLIAMS SCHOOL TANK FARM

The Z. John Williams School tank farm is located in a marshy area on the southern side of the school.

5.1.1 Site Map/Drawing

Figure 3 shows tank locations relative to other site features and structures. Sampling locations are identified, as well as piping/header locations, and photograph locations.

5.1.2 Site Description

GPS coordinates for the Z. John Williams School tank farm are N 60° 42’ 29.7”, W 161° 45’ 30.6”. The tank farm is an active fuel storage facility that was constructed in the early 1980’s. The tank farm is owned by The State of Alaska Department of Education and operated by the Lower Kuskokwim School District. Diesel fuel stored in the bulk storage tanks is primarily used to fill day tanks at the school and teacher accommodations to be used as heating fuel. Fuel from the tanks also serves the emergency generator for the school. The fuel storage tanks are filled by a fuel barge once per year via a fuel header on the north side of the school.

The tank farm consists of four horizontal aboveground tanks with a total fuel storage capacity of approximately 38,892 gallons. Each tank has a fuel capacity of approximately 9,723 gallons. The tanks are welded steel construction with steel cradles that rest on wood platforms made of treated timbers and planks. The school’s spill plan for this tank farm indicates that the original construction of the fuel facility included a containment area consisting of sandbag berms and an impermeable liner. The four tanks are designated FBT-459-01, FBT-459-02, FBT-459-03, and FBT-459-04. A locked fence surrounds the entire containment area.

5.1.3 Site Reconnaissance

No documented spill history was found for this tank farm. The fuel facility operator and school personnel were not aware of any spills at the tank farm.

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The contact for this site is Paul Maxie. Paul is the local resident in charge of the fuel tank farm and maintenance at the Z. John Williams School in Napaskiak.

The area surrounding this tank farm was a grassy, marshy area with standing water.

There were no obvious signs of leaks in any areas of the fueling facility. Existing piping was welded steel construction and leaking joints were not evident. Some abandoned pipeline with threaded connections was found at the site, but contamination was not evident. Vegetation covered the berms and containment area of the tank farm. The presence and integrity of the impermeable liner could not be observed. Standing water was present within the secondary containment area. No sheen was observed on the water.

Sample locations were selected on three sides of the facility, with one of the samples being collected beneath a joint in a section of the abandoned threaded connection pipeline. All sample locations were in areas with standing water and a surface cover of grassy peat.

5.1.4 Analytical Results

Soil sample analytical results are summarized in Tables 1 and 2. Laboratory sample analytical results for Diesel Range Organics/Residual Range Organics (DRO/RRO) and Gasoline Range Organics/Benzene, Toluene, Ethylbenzene, and total Xylenes (GRO/BTEX) are also shown on Figure 3.

Analytical sample results for DRO concentrations in the school tank farm area range from 16.3 mg/kg to 27.9 mg/kg. RRO concentrations range from 108 mg/kg to 178 mg/kg. GRO/BTEX was not detected in the one sample collected for GRO/BTEX in this area.

5.1.5 Discussion and Recommendations

Analytical results exceeding 18AAC75 Method Two Arctic Zone cleanup levels for DRO/RRO and GRO/BTEX were not encountered at this tank farm area. Inspection of laboratory analytical chromatograms of the samples collected from this area indicates that the DRO and RRO levels encountered are mainly biogenic in nature and probably not associated with a fuel spill. The chromatogram for NPTF1-1(2’) indicates the possibility of a combination of diesel and biogenic material, but the sample results still show DRO concentrations well below cleanup levels.

Visual observations and interviews with residents of Napaskiak did not indicate a history of contamination at the site. According to interviews with the Z. John Williams School fuel facility operator, the fuel tanks passed tightness testing in 1999 (Paul Maxie, September 7, 2001).

Based on analytical sample results and information gathered during site reconnaissance for the Z. John Williams School tank farm, OASIS recommends no further assessment of the school tank farm.

5.2 SITE 2: NAPASKIAK ELECTRIC UTILITY TANK FARM

The Napaskiak Electric Utility tank farm is located at the southern edge of town near the landfill and the honey bucket lagoon.

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5.2.1 Site Map/Drawing

Figure 4 shows tank locations relative to other site features and structures. Sampling locations are identified, as well as piping/header locations, and photograph locations.

5.2.2 Site Description

The GPS coordinates for the Napaskiak Electric Utility tank farm are N 60° 43’ 23.8”, W 161° 45’ 46.1”. The Napaskiak Electric Utility tank farm is an active fuel storage facility that provides diesel fuel for electrical power generation for the community of Napaskiak and the Z. John Williams School. Storage tanks are filled through a welded steel pipe that is filled by fuel barge once per year at a header near the abandoned BIA school building.

The tank farm consists of one vertical aboveground tank and one horizontal tank in a lined containment area with sandbag berms. An eight-foot fence surrounds the entire power generation facility. Each bulk fuel storage tank has an approximate capacity of 20,000 gallons, with a total storage capacity of approximately 40,000 gallons. At the time of this site reconnaissance, there was also a skid mounted 500-gallon horizontal tank within the containment area. The 500-gallon tank was not being used. The tanks are welded steel construction. The horizontal tank rests directly on the containment area liner and is blocked in place with planks on either side. The vertical tank rests on a pad constructed of treated timbers.

5.2.3 Site Reconnaissance

OASIS did not locate any information regarding documented spills at the Napaskiak Electric Utility tank farm. The tank farm manager and tank farm operators were not aware of any spills that had occurred at the tank farm. (Joseph Steven, Ivan Maxie, Walter Johnson, Jr September 7, 2001).

The contact for this site is Joseph Steven. Mr. Steven is the utility manager for Napaskiak Utilities. The two operators, Ivan Maxie and Walter Johnson Jr, carry out the daily operation and maintenance of the fuel facility.

The area around the outside of the Napaskiak Electric Utility is predominantly marshy, grassy wetland with standing water. The tank farm, power generating plants, and associated buildings are located on a raised sand and gravel pad. A new consolidated bulk fuel storage tank farm for the Village of Napaskiak is being constructed adjacent to the existing Napaskiak Electric Utility.

The containment area berm on the northwest side of the tank farm appears to have been compromised at some time. The containment area liner has vegetation growing in it, is ripped in several locations, and standing water is present. No sheen was apparent on the standing water in the containment area.

Waste oil from the electrical generating equipment is stored in 55 gallon drums along the fence on the northwestern side of the tank farm. Two of the used oil drums were not closed because fuel facility operators were unable to get the bungs screwed on.

Soil samples were collected in three locations at the Napaskiak Electric Utility tank farm.

One sample location was selected immediately outside of the containment berm where it appeared that the berm had been compromised in the past. One sample was collected

- 9 -on each of the southwestern and northeastern sides of the tank farm on the outside of the fence. The two samples collected on the outside of the fence were collected in marshy, grassy areas with standing water.

5.2.4 Analytical Results

Soil sample analytical results are summarized in Tables 1 and 2. DRO/RRO and GRO/BTEX sample analytical results are also shown on Figure 4.

Analytical sample results from the three locations sampled indicate DRO concentrations ranging from non-detect to 33.3 mg/kg. RRO results range from 45.4 mg/kg to 116 mg/kg. The results from the single GRO/BTEX sample that was collected from this site indicate that GRO/BTEX concentrations were below detection limits, except for a toluene result of 0.191 mg/kg.

5.2.5 Discussion and Recommendations

None of the analytical results from samples collected from the Napaskiak Electric Utility indicate soil contamination in concentrations exceeding 18AAC75 Method Two Arctic Zone cleanup levels for DRO/RRO or GRO/BTEX. Inspection of laboratory analytical chromatograms of the samples collected from this area indicates that the DRO and RRO levels encountered are mainly biogenic in nature and probably not associated with a fuel spill. The chromatogram for NPTF3-1(4’) indicates the possibility of a combination of diesel and biogenic material, but the sample results still show DRO concentrations well below cleanup levels.

Sample results from this site indicate that significant contamination at this fuel facility is not present. OASIS recommends no further assessment for this site.

5.3 SITE 3: NAPASKIAK INCORPORATED STORE

The Napaskiak Incorporated Store tank farm is located at the western end of the Village of Napaskiak.

5.3.1 Site Map/Drawing

Figure 5 shows tank locations relative to other site features and structures. Sampling locations are identified, as well as piping locations, and photograph locations.

5.3.2 Site Description

The GPS coordinates for the Napaskiak Incorporated Store are N 60° 42’ 28.4”, W 161° 45’ 45.4”. The Napaskiak Incorporated Store bulk fuel storage tanks are an active fuel storage facility. The tanks are owned and operated by the Napaskiak Incorporated Store. Heating fuel that is stored in these tanks is used to heat the Napaskiak Incorporated Store building. The store no longer sells fuel to the community.

The fueling facility consists of three horizontal tanks resting on welded steel frames.

The tanks are welded steel construction. Two of the tanks have approximate capacities of 840 gallons, while the third has a capacity of approximately 590 gallons, for a total of approximately 2,270 gallons. The tanks are piped directly into the adjacent buildings

- 10 -that they serve. The tanks and stands are mounted in a secondary containment box with 1.5 feet high walls constructed of wood and lined with an impermeable membrane.

5.3.3 Site Reconnaissance

No information on historical spills was found for this site.

The contact for this site is Jackie Larson.

The area surrounding the Napaskiak Incorporated Store fuel storage area is predominantly marshy with standing water. A raised gravel pad with a new double-walled above ground storage tank borders the southern side of the existing tank farm.

Standing water was present in the containment area. No sheen was observed on the water in the containment area.

Three sample locations were selected at this site. One sample was collected from outside of the wall on each side of the containment area not bordered by the raised gravel pad. The sample collected on the western side of the fuel facility was taken from directly below fuel piping that enters the adjacent building.

5.3.4 Analytical Results

Soil sample analytical results are summarized in Tables 1 and 2. DRO/RRO and GRO/BTEX sample analytical results are also shown on Figure 5.

Analytical sample results from the three locations sampled indicate DRO concentrations ranging from 25.6 mg/kg to 54.7 mg/kg. RRO results range from 130 mg/kg to 280 mg/kg. The results from the single GRO/BTEX sample that was collected from this site indicate GRO/BTEX concentrations below detection limits except for a toluene concentration of 0.0733 mg/kg.

5.3.5 Discussion and Recommendations

Analytical sample results from DRO/RRO and GRO/BTEX samples collected at the Napaskiak Incorporated Store do not indicate concentrations of either analyte above 18AAC 75 Method Two Arctic Zone cleanup levels. Inspection of laboratory analytical chromatograms of the samples collected from this area indicates that the DRO and RRO levels encountered are mainly biogenic in nature and probably not associated with a fuel spill. The chromatogram for NPTF4-2(3’) indicates the possibility of a combination of diesel and biogenic material, but the sample results still show DRO concentrations well below cleanup levels.

Sample results from this site indicate that further assessment of this fuel facility is not warranted. OASIS recommends no further assessment for this site.

5.4 SITE 4: NAPASKIAK INCORPORATED STORE TANK FARM (FORMER

LOCATION)

The former location of the Napaskiak Incorporated Store bulk fuel tanks is approximately 75 feet north of the Z. John Williams School, and approximately 50 feet to the west of a residence.

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5.4.1 Site Map/Drawing

Figure 6 shows the area of the former tank locations relative to other site features.

Sampling locations are identified as well as photograph locations.

5.4.2 Site Description

The GPS coordinates for the former location of the Napaskiak Incorporated Store fuel storage tanks are N 60° 42’ 33.1”, W 161° 45’ 29.3”. Fuel storage tanks no longer exist at this location. The land beneath the tanks was eroding and two of the fuel tanks were moved to their current location at the Napaskiak Electric Utility tank farm. The third was sold to a coastal community and hauled off during winter months.

The fuel storage tanks that were previously located in this area were the two 20,000 gallon tanks that are currently in operation at the Napaskiak Electric Utility. Judging from aerial photographs, the third tank that was once located in this area was of similar capacity. OASIS estimates that the total capacity of former tank farm was approximately 60,000 gallons. Aerial photos show no obvious containment areas, and tank platforms are difficult to discern in the photo.

5.4.3 Site Reconnaissance

No information on historical spills was found for this site.

There is no site contact for this location.

A stained soil area is evident in the vicinity of this former bulk fuel storage facility. The area is approximately 10 feet wide by 20 feet long. The site is bordered by standing water on its east and west sides. No sheen was observed on the surface water.

One sample location was selected near the center of the stained area. Samples were collected at one foot bgs and three feet bgs. Field screening was performed with a photoionization detector (PID) at the two intervals. Field screening results for the one and three foot bgs intervals were 562 parts per million (ppm) and 559 ppm, respectively.

5.4.4 Analytical Results

Soil sample analytical results are summarized in Tables 1 and 2. DRO and GRO/BTEX sample analytical results are also shown on Figure 6.

Analytical sample results for the two GRO samples collected in this location indicate concentrations of 779 mg/kg and 2,890 mg/kg. The DRO sample results indicate concentrations of 17,000 mg/kg and 21,600 mg/kg. RRO concentrations in this location were <544 mg/kg and <1,500 mg/kg. Analytical sample results indicate concentrations of benzene in these two sample intervals to be 22.7 mg/kg and 180 mg/kg. Toluene sample results show concentrations of 138 mg/kg and 418 mg/kg. Concentrations of ethylbenzene in this location were shown by analytical samples results to be 6.76 mg/kg and 58.5 mg/kg. The analytical sample results for xylene concentrations at this location were 65.4 mg/kg and 319 mg/kg.

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5.4.5 Discussion and Recommendations

Samples collected from the one foot bgs interval have DRO and benzene concentrations above 18AAC75 Method Two Arctic Zone cleanup levels. At the three feet bgs interval, concentrations of GRO, DRO, benzene, toluene, and total xylenes are above the 18AAC75 Method Two Arctic Zone cleanup levels.

Review of laboratory analytical chromatograms for this location also indicates the presence of an unknown volatile contaminant in the soil.

Based on the above analytical sample results, and the proximity of this location to surface water, OASIS recommends that further assessment be performed at this location. The assessment should include collection of additional samples to identify the volatile contaminant in the soil.

Visual observation of this site indicates an area of approximately 200 ft2 of stained soil with contamination extending vertically at least three feet bgs.

5.5 SITE 5: BIA SCHOOL DAY TANKS (FORMER LOCATION)

The old BIA school day tank was located near the utility building for the BIA school which is located near the riverbank northwest of the Z. John Williams School.

5.5.1 Site Map/Drawing

Figure 7 shows the location of the former day tanks with respect to the abandoned BIA school and utility building.

5.5.2 Site Description

The GPS coordinates for the former location of the BIA school day tanks are N 60° 42’ 32.8”, W 161° 45’ 38.3”. There are no longer any fuel tanks in this location, but portions of a fuel tank cradle constructed of treated wood remains. An area of stained soil measuring approximately 10.5 feet by 11 feet surrounds the fuel tank cradle.

5.5.3 Site Reconnaissance

Conversations with Lower Kuskokwim School District personnel indicate that a diesel fuel release occurred in this location that was discovered in October 1993. The school district personnel worked with ADEC to address the diesel release in this location. The fuel release was attributed to leaking fuel pipelines associated with the BIA school building complex and BIA utility building. Piping and fuel tanks related to this spill have been removed.

The Lower Kuskokwim School District contact for this site is Pat Desmet.

One soil sample location was selected in the center of the stained area encountered near the utility building. Soil was field screened with a PID at the one foot bgs and three feet bgs intervals resulting in readings of 295 ppm and 396 ppm, respectively. A soil sample was collected from the three feet bgs interval.

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5.5.4 Analytical Results

Soil sample analytical results are summarized in Tables 1 and 2. DRO/RRO and GRO/BTEX sample analytical results are also shown on Figure 7.

Analytical sample results from this location indicate DRO concentrations of 38,900 mg/kg. Analytical results for GRO show concentrations of 19.7 mg/kg. RRO concentrations in this location are <2,970 mg/kg. Analytical sample results indicate concentrations of benzene in this sample interval to be 0.023 mg/kg. Toluene sample results show concentrations of 0.0931 mg/kg. Concentrations of ethylbenzene in this location were shown by analytical samples results to be 0.193 mg/kg. The analytical sample result for xylene concentrations at this location was 2.353 mg/kg.

5.5.5 Discussion and Recommendations

Analytical sample results for DRO indicate concentrations exceeding 18AAC75 Method Two Arctic Zone cleanup levels. Based on the DRO levels reported, and the proximity of the site to the Kuskokwim River, OASIS recommends further assessment for this site.

Visual observation of this site indicates an area of approximately 115 ft2 of stained soil with contamination extending vertically at least three feet bgs.

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6 DATA VALIDATION SUMMARY

The analytical results for the soil samples and laboratory quality assurance and quality control (QA/QC) samples were evaluated in accordance with EPA data validation guidelines. The data was reviewed to determine the integrity of the reported analytical results and ensure they met the established data quality objectives.

A trip blank sample was collected and submitted along with the soil samples for analysis of GRO and BTEX compounds. GRO and BTEX were not detected in the associated trip blank sample indicating cross contamination did not occur during shipping or sample collection.

Two method blank samples analyzed in the laboratory to evaluate instrument and sample cross contamination contained benzene and/or toluene at concentrations above their respective practical quantitation limits. Only sample NPTF6-1 (3’) was directly affected by the method blank. This sample contained concentrations of benzene similar to those detected in its associated method blank. As a result the reported benzene concentration in NPTF6-1 (3’) has been flagged “B” to indicate potential bias exists in the reported benzene result. None of the other samples analyzed in conjunction with the method blanks were biased by the low level benzene and toluene contaminants.

During laboratory analysis, six soil samples analyzed for RRO and three soil samples analyzed for DRO had surrogate compound recoveries exceed acceptable control limits.

Surrogate compounds are added by the laboratory to all samples analyzed for PAH, GRO/BTEX, and DRO/RRO to evaluate the accuracy of the analysis within each individual sample. The cause of the elevated surrogate compound recoveries is attributed to sample matrix effects. The DRO and RRO results have not been significantly biased by the high surrogate recovery due to the quantification of multiple compounds present in the various hydrocarbon ranges.

During laboratory analysis, three soil samples (NPTF5-1(1’), NPTF5-1 (3’), and NPTF10-1 (1’)) analyzed for GRO/BTEX had surrogate compound recoveries exceed acceptable control limits due to matrix effects. Only the associated BTEX compound results have been flagged “J” to indicate these results may be biased. The GRO results have not been biased by the elevated surrogate compound recoveries due to the method of quantification. One sample (NPTF1-1 (2’)) analyzed for GRO/BTEX had field surrogate compound recoveries well below (17% recovery) acceptable control limits. A field surrogate is added to the methanol used to preserve the soil samples in the field to evaluate factors affecting sample collection and shipping. The low recovery of this surrogate compound indicates the integrity of the sample may have been jeopardized during collection or transport. Therefore, the associated BTEX/GRO results have been flagged “J” as estimated to indicate the results may be biased low. These flagged results were all reported non-detect.

Duplicate sample results were evaluated for analytical precision in accordance with US Environmental Protection Agency (EPA) data validation protocols. These results were comparable with one exception. The results for Fluorene in sample NPTF1-1(2’) exceeded 20% relative percent difference (RPD) values established as a data quality

- 15 -objective for this project. The associated results for the original and duplicate sample have been flagged “J” to indicate bias exists in the reported concentrations.

Additional QA/QC anomalies were observed in the associated laboratory data. However, these anomalies had no direct bearing on the reported analytical results and, except as noted above, the data quality objectives were met for the assessment activities.

- 16 -

7 SUMMARY TABLE OF SITES

The following table is a summary of the OASIS recommendations for each site investigated in the Village of Napaskiak.

Site Description

Number of Tanks

Total Capacity (gallons

Facility Status (active/inactive)

Recommendation

Z. John Williams School

4 38,892 Active No further assessment

Napaskiak Electric Utility

2 40,000 Active No further assessment

Napaskiak Incorporated Store

3 2,270 Active No further assessment

Napaskiak Incorporated Store Tank Farm (Former Location)

0 0 Inactive Further assessment

BIA School Day Tanks (Former Location)

0 0 Inactive Further assessment

- 17 -

TABLES

Table 1 Analytical Results Summary

Village of Napaskiak Site Assessement

GRO DRO RRO Benzene Toluene Ethylbenzene Xylenes

NPTF1-1 NPTF1-1(2') 9/7/01 2.0 <1.54J 27.9 108 <0.00771J <0.0309J <0.0309J <0.0309J

NPTF1-2 NPTF1-2(1.5') 9/7/01 1.5 21.6 178

NPTF1-3 NPTF1-3(3') 9/7/01 3.0 16.3 116

NPTF3-1 NPTF3-1(4') 9/7/01 4.0 <3.07 33.3 74.9 <0.0153 0.191 <0.0614 <0.0614

NPTF3-2 NPTF3-2(2') 9/7/01 2.0 <13.0 45.4

NPTF3-3 NPTF3-3(3') 9/7/01 3.0 14.9 116

NPTF4-1 NPTF4-1(2') 9/7/01 2.0 <3.31 28.4 280 <0.0166 0.0733 <0.0662 <0.0662

NPTF4-2 NPTF4-2(3') 9/7/01 3.0 54.7 130

NPTF4-3 NPTF4-3(3') 9/7/01 3.0 25.6 296

NPTF5-1 NPTF5-1(1') 9/7/01 1.0 779 17,000 <544 22.7J 138J 6.76J 65.4J

NPTF5-1 NPTF5-1(3') 9/7/01 3.0 2,890 21,600 <1,500 180J 418J 58.5J 319J

NPTF6-1 NPTF6-1(3') 9/7/01 3.0 19.7 38,900 <2,790 0.023B 0.0931 0.193 2.353

* Analytical results shown in red exceed 18AAC75 Method Two Cleanup Levels.

** A blank cell indicates that a location was not sampled for that analyte.

J - Indicates result is estimated.

B- Indicates analyte was detected in blank associated with the sample.

Soil Sample Analytical results in mg/kg Test Pit ID Sample ID Date

Depth (ft bgs)

Site #3-Napaskiak Incorporated Store

Site #4-Former Location of Napaskiak Incorporated Store Fuel Tanks

Site #5-Former Location of BIA School Day Tanks

Site #1-Z. John Williams School

Site #2-Napaskiak Electric Utility

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Table 2 PAH Analytical Results Summary

Village of Napaskiak Site Assessment

Sample Location: ADEC NPTF1-1(2') NPTF3-1(4') NPTF4-1(2') NPTF5-1(1') NPTF6-1(3') Sample Depth (feet): Method Two 2.0 4.0 2.0 1.0 3.0

Soil Cleanup Standards

Naphthalene 5,500 .0679(U) 0.0856 (U) 0.0838 (U) 81.400 83.40000 Acenaphthylene NE .0679(U) 0.0856 (U) 0.0838 (U) 0.0832 (U) 0.0851 (U) Anthracene 41,000 .0679(U) 0.0856 (U) 0.0838 (U) 0.0832 (U) 0.43100 Fluoranthene 5,500 .0679(U) 0.0856 (U) 0.0838 (U) 0.0832 (U) 10.10000 Pyrene 4,100 .0679(U) 0.0856 (U) 0.0838 (U) 0.0832 (U) 7.23000 Chrysene 1500 .0679(U) 0.0856 (U) 0.0838 (U) 0.0832 (U) 0.76100 Benzo(b)fluoranthene 15 .0679(U) 0.0856 (U) 0.0838 (U) 0.0832 (U) 0.27600 Benzo(k)fluoranthene 150 .0679(U) 0.0856 (U) 0.0838 (U) 0.0832 (U) 0.0851 (U) Benzo(a)pyrene 1.5 .0679(U) 0.0856 (U) 0.0838 (U) 0.0832 (U) 0.13100 Acenaphthene 8,200 .0679(U) 0.0856 (U) 0.0838 (U) 0.455 6.55000 Fluorene 5,500 .0679(U) 0.0856 (U) 0.0838 (U) 1.96J 6.48000 Benzo(g,h,i)perylene NE .0679(U) 0.0856 (U) 0.0838 (U) 0.0832 (U) 0.0851 (U) Phenanthrene NE .0679(U) 0.0856 (U) 0.0838 (U) 0.811 8.66000 Benzo(a)anthracene 15 .0679(U) 0.0856 (U) 0.0838 (U) 0.0832 (U) 0.86400 Indeno(1,2,3-cd)pyrene 15 .0679(U) 0.0856 (U) 0.0838 (U) 0.0832 (U) 0.0851 (U) Dibenzo(a,h)anthracene 1.5 .0679(U) 0.0856 (U) 0.0838 (U) 0.0832 (U) 0.0851 (U)

Notes: All results reported in mg/Kg - unless otherwise specified mg/kg - Miligram per Kilogram

NE - Not Established PAH - Polynuclear Aromatic Hydrocarbon

12,000 (U) - Not detected at or above method reporting limits indicated J - Indicates result is estimated.

\\Newserver\adec\2001 UST-AST Term Contract\Napaskiak\Tables\Table 2\Table 2 - PAH Summary 10/19/01

- 18 -

FIGURES

NAPASKIAK, ALASKA

ADEC UST PROGRAM

FIGURE

PROJECT MGR: K. Hill

DRAWN BY: N. Oberlee

CHECKED BY: M. Schwenne

SITE VICINITY MAP

807 'G' Street, Suite 250 Anchorage, AK. 99501

(907) 258-4880 Fax (907) 258-4033

NORTH

Z. John Williams School

Tank Farm #1

Tank Farm #3

Landfill

Airport

New Tank Farm Location

Napaskiak Incorporated Store

Tank Farm #4

Honey Bucket Lagoon

School Sewage Lagoon

Tank Farm #5 (former location

Tank Farm #6 (former location

Old BIA Tanks (removed)

Drinking Water Well

Drinking Water Well

Drinking Water Well

Kuskokwim River

SOURCE: AEROMAP US PHOTO DATED 6-14-96, ROLL#96-30C-EXP#1-3Approximate Scale (ft)

0 600300

SITE MAP FOR TANK FARM #1

Z. JOHN WILLIAMS SCHOOL

SITE ASSESSMENT

NAPASKIAK, ALASKA

ADEC UST PROGRAM

Proj: 14-007 FIGURE NO.

3Drawn: N. Oberlee

Checked: K. Hill

0 10 20

APPROXIMATE SCALE IN FEET

Fence

NORTH

Tank Platform

Approximate Tank Sizes

Standing water throughout bermed area

To Fill Line

To school day tanksand housing day tanks Photo #44

Photo #42 Photo #43

Phot o #

45&

NPTF1-3

NPTF1-1

NPTF1-2

NPTF1-1 (2' bgs) DRO = 27.9 mg/kg RRO = 108 mg/kg GRO = ND (<1.54 mg/kg) B = ND (<0.00771 mg/kg) T = ND (<0.0309 mg/kg) E = ND (<0.0309 mg/kg) X = ND (<0.0309 mg/kg)

NPTF1-3 (3' bgs) DRO = 16.3 mg/kg RRO = 116 mg/kg

NPTF1-2 (1.5' bgs) DRO = 21.6 mg/kg RRO = 178 mg/kg

Berm

SITE MAP FOR TANK FARM #3

NAPASKIAK ELECTRICAL UTILITY

SITE ASSESSMENT

NAPASKIAK, ALASKA

ADEC UST PROGRAM

Proj: 14-007 FIGURE NO.

4Drawn: N. Oberlee

Checked: K. Hill

0 10 20

APPROXIMATE SCALE IN FEET

NORTH

BoardwalkGa te

~20,000 Gallons

~20,000 Gallons

Low area (water drainage)

Shop

Generator Building

Pumphouse

Ramp

Fence

To New Tank Farm

Fill Line

Photo #64

NPTF3-2

NPTF3-3

Photo #65

Photo #63

Photo #62

Photo #61

Gate

Small Road

NPTF3-1

Used Oil Storage 55-Gal Drums (filled)

Used drums in the process of being filled

NPTF3-3 (2' bgs) DRO = ND (<13 mg/kg) RRO = 45.4 mg/kg

NPTF3-3 (3' bgs) DRO = 14.9 mg/kg RRO = 116 mg/kg

NPTF3-1 (4' bgs) DRO = 33.3 mg/kg RRO = 74.9 mg/kg GRO = ND (<3.07 mg/kg) B = ND (<0.0153 mg/kg) T = 0.191 mg/kg E = ND (<0.0614 mg/kg) X = ND (<0.0614 mg/kg)

500 Gallon Tank

Berm

SITE MAP FOR TANK FARM #4

NAPASKIAK INCORPORATED STORE

SITE ASSESSMENT

NAPASKIAK, ALASKA

ADEC UST PROGRAM

Proj: 14-007 FIGURE NO.

5Drawn: N. Oberlee

Checked: K. Hill

0 5 10

APPROXIMATE SCALE IN FEET

NORTH

Photo #47

Photo #48

Photo #49

Building Edge Building Edge

Walkway and Fan

New Double-walled Above Ground Tank

-Standing water throughout-

Plywood and 2x4 dike with linerPhoto #50

NPTF4-2

NPTF4-1

Gravel Slope

NPT4-3

NPT4-1 (2 ft. bgs) DRO = 28.4mg/kg RRO = 280 mg/kg GRO = ND (<3.31 mg/kg) B = ND (<0.0166 mg/kg) T = 0.0733 mg/kg E = ND (<0.0662 mg/kg) X = ND (<0.0662 mg/kg)

NPT4-2 (3 ft. bgs) DRO = 54.7 mg/kg RRO = 130 mg/kg

NPT4-3 (3 ft. bgs) DRO = 25.6 mg/kg RRO = 296 mg/kg

SITE MAP FOR TANK FARM #5

FORMER LOCATION OF STORE TANKS

SITE ASSESSMENT

NAPASKIAK, ALASKA

ADEC UST PROGRAM

Proj: 14-007 FIGURE NO.

6Drawn: N. Oberlee

Checked: K. Hill

Deep Puddles Photo #56

Stained Soil

Stressed Vegetation

Deep Puddle

Photo #54

ResidencePhoto #55

NPTF5-1

NPTF5-1 (1' bgs) DRO = 17,000 mg/kg RRO = ND (<544 mg/kg) GRO = 779 mg/kg B = 22.7 mg/kg T = 138 mg/kg E = 6.76mg/kg X = 65.4 mg/kg

NPTF5-1 (3' bgs) DRO = 21,600 mg/kg RRO = ND (<1,500 mg/kg) GRO = 2,890 mg/kg B = 180 mg/kg T = 418 mg/kg E = 58.5 mg/kg X = 319 mg/kg

0 3 6

APPROXIMATE SCALE IN FEET

NORTH

SITE MAP FOR TANK FARM #6

OLD BIA SCHOOL TANKS

SITE ASSESSMENT

NAPASKIAK, ALASKA

ADEC UST PROGRAM

Proj: 14-007 FIGURE NO.

7Drawn: N. Oberlee

Checked: K. Hill

0 63

APPROXIMATE SCALE IN FEET

Utilidor

Photo #59

Wood Crib

Photo #60

NPTF6-1

Pipeline Header for Electric Utility

OLD UTILITY BUILDING

ABANDONED

BIA SCHOOL

BUILDING

NPTF6-1 (3' bgs) DRO = 38,900 mg/kg RRO = ND (<2,790 mg/kg) GRO = 19.7 mg/kg B = 0.023 mg/kg T = 0.0931 mg/kg E = 0.193 mg/kg X = 2.353 mg/kg

- 19 -

Appendix A

Field Notes

- 20 -

Appendix B Photo Log

- 21 -

Appendix C Chain-of-Custody and Laboratory Analytical Reports