environmental sampling report - wa

Environmental Sampling Report

R Corner Grocery

Prepared For:

Shing Ledgerwood

1015 East 4th Avenue, Olympia, Washington 98506

Phone: 360.754.2128 Fax: 360.754.9299

April 25, 2017 Shing Ledgerwood 256421 Highway 101 Port Angeles, Washington 98368 Report Environmental Sampling R Corner Grocery 256421 Highway 101 Port Angeles, Washington Project No. 671-001-05 INTRODUCTION Insight Geologic, Inc. is pleased to provide our report of environmental sampling services performed at the R Corner Grocery store, located at 256421 Highway 101 in unincorporated Clallam County, Washington. The property comprises approximately 1.41 acres with a building used as a gas station and convenience store located on a single parcel. The property is shown relative to surrounding physical features on the Vicinity Map, Figure 1. A release of unleaded gasoline from the underground storage tanks was discovered in about 1993, during tank removal and replacement activities. A portion of the contaminated soil was remediated by excavation and removal to an approved landfill. Residual gasoline-impacted soils were left beneath the western portion of the building, where continued excavation would compromise the structural integrity of the building. Three groundwater monitoring wells, installed at the site as a part of remedial activities, also indicated residual gasoline concentrations greater than the Washington State Department of Ecology (Ecology) Model Toxics Control Act (MTCA) Method A cleanup levels. At the request of Ecology, in October 2014, Insight Geologic conducted soil sampling activities from below the west side of the building in areas previously identified as containing residual impacts and submitted the samples for the analysis of gasoline-range hydrocarbons, benzene, toluene, ethylbenzene and xylenes (BTEX), and lead. Laboratory results indicated that these parameters were either not detected or detected at levels less than the applicable MTCA Method A cleanup levels for unrestricted land use. The results of our soil sampling activities are contained in our report dated October 29, 2014. Groundwater samples were collected from the groundwater monitoring well network (MW-1, MW-2 and MW-3) in June and November 2014, February, April and July 2015. Gasoline-range hydrocarbons, BTEX and lead concentrations were less than the MTCA Method A cleanup levels in all wells in all of our sampling events with one exception for lead. Soil samples collected from below

R Corner Grocery Environmental Sampling Report April 25, 2017

File No. 671−001−05 3

Insight Geologic, Inc.

the west edge of the building for gasoline-range hydrocarbons, BTEX and lead are less than their respective MTCA Method A cleanup levels for unrestricted land use. On November 17, 2015, R Corner Grocery entered into the Washington State Department of Ecology’s Voluntary Cleanup Program (VCP) in an effort to obtain a No Further Action (NFA) determination from the Department of Ecology. Following review of the VCP application and presented data, the Department of Ecology has requested further groundwater sampling across the north side of the building to evaluate residual concentrations, if any, of gasoline-range hydrocarbons, BTEX and lead. SCOPE OF SERVICES The purpose of our services was to evaluate the possible presence of petroleum contamination remaining in groundwater at R Corner Grocery, specifically in the area hydraulically downgradient from the underground storage tanks between monitoring wells MW-1 and MW-2. Our specific scope of services included the following tasks:

1. Provide for the location of subsurface utilities in the investigation area. Boring locations were manually cleared to a depth of 3 feet below ground surface (bgs) using hand tools to evaluate for utility obstructions prior to drilling.

2. Drill five (5) exploratory borings across the north side of the building using a truck-mounted probe rig. The borings were drilled to depths of between 12 and 15 feet bgs, which was approximately 2 feet into the groundwater table, with soil samples collected continuously during drilling.

3. Sample groundwater from the five (5) exploratory borings and provided for the analyses of five (5) groundwater and two (2) soil samples for the presence of gasoline-range hydrocarbons using Ecology Method NWTPH-Gx, BTEX (benzene, ethylbenzene, toluene, xylenes) using EPA Method 8260 and total lead.

4. Evaluate the analytical results with respect to the Washington State Department of Ecology MTCA Method A cleanup levels.

5. Evaluate the potential for vapor intrusion into the building using the Draft 2016 Guidance for Evaluating Soil Vapor Intrusion in Washington State.

6. Prepare a Terrestrial Ecologic Evaluation (TEE) Report for the property.

7. Prepare a letter report for submittal to the Department of Ecology containing a summary of the laboratory results, the results of our evaluation in regards to MTCA Method A cleanup levels, and Vapor Intrusion Guidance, and a map showing the location of the borings. In addition, our report includes a simplified terrestrial ecological evaluation of the site.

FINDINGS General

We completed five borings on the subject site using a truck-mounted GeoProbe drilling rig on the north side of the building, between the areas of MW-1 and MW-2. Soil samples were collected continuously from the five borings to depths of between 12 and 15 feet bgs. The locations of the borings are shown in the Site Plan, Figure 2.


File No. 671−001−05 4


Representative samples were collected into laboratory supplied sampling containers in general accordance with EPA sampling protocol. Following collection, the samples were sealed, labeled and placed into an ice chest containing blue ice for transport to the analytical laboratory. Chain of custody forms were completed in the field and accompanied the samples to the laboratory. Borings were then abandoned by removing all sampling tools and backfilled with bentonite as required by Ecology. Soil

The borings encountered fine to coarse sand and gravel outwash deposits consistent with soils encountered during previous activities at the site. Our boring logs for each of the borings are included in Attachment A. Groundwater

Groundwater was encountered in each of the borings at depths ranging between 10 feet bgs in boring B-2 and 12.9 feet bgs in boring B-1. Laboratory Results

Five groundwater samples and two soil samples were submitted to the Libby Environmental laboratory in Olympia, Washington for the analysis of gasoline-range hydrocarbons using Ecology Method NWTPH-Gx, BTEX (benzene, ethylbenzene, toluene, xylenes) using EPA Method 8260 and total lead. The laboratory reported that gasoline-range hydrocarbons and BETX were not detected within the soil and groundwater samples. Lead either was not detected or were detected at concentrations less than the respective MTCA Method A cleanup levels for soil and groundwater. A summary of the laboratory analyses is contained in Table 1 and Table 2. A copy of the laboratory report is included in Attachment B. SOIL VAPOR INTRUSION An evaluation was conducted to evaluate for soil vapor intrusion at the site. The evaluation was conducted in general accordance with the Washington State Department of Ecology 2016 Draft version “Guidance for Evaluating Soil Vapor Intrusion in Washington State: Investigation and Remedial Action.”

Following the above guidance, a Tier 1 Assessment was completed. Based on the results of our assessment, we have concluded that gasoline-range petroleum hydrocarbons and BTEX were not present at the site in soil and groundwater at concentrations greater than the generic screening levels, and that the screening levels are conservative based on known site characteristics, therefore no further evaluation is required.


File No. 671−001−05 5


TERRESTIAL ECOLOGIC EVALUATION

As part of this report, a simplified Terrestrial Ecological Evaluation (TEE) was completed for the site in accordance with the MTCA, WAC 173-340-7490 through 173-340-7494. The TEE findings indicate that there is no unacceptable risk to ecological receptors at the site as no chemicals of ecologic concern, as identified on Ecology Table 749-2, have been found to exist at concentrations greater than the applicable unrestricted land use levels at the subject site.

CONCLUSIONS Insight Geologic has conducted our environmental sampling services on the property located at 256421 Highway 101 in Port Angeles, Washington. The purpose of our services was to evaluate for residual gasoline-range hydrocarbon concentrations in soil and groundwater at the site resulting from a historical release from the existing underground storage tank system. We drilled five borings to access soil beneath the north side of the building on the property. The borings were conducted to depths of between 12 and 15 feet bgs. Soil and groundwater samples were collected from the borings and submitted for the analysis of gasoline-range hydrocarbons, BETX and lead. Laboratory results indicate that residual concentrations of gasoline-range hydrocarbons and BETX were not detected, and concentrations of lead in groundwater are less than the respective MTCA Method A cleanup levels for unrestricted land use. Previous groundwater sampling events, including groundwater sampling within the on-site sump and former well on December 14, 2016, also indicated that gasoline-range hydrocarbons and BETX are not present at the site. Based on these results, it is our opinion that the residual gasoline contamination resulting from the historic release of fuel from the underground storage tanks has undergone natural attenuation in both soil and groundwater, and does not pose a threat to human health or the environment. The site should be considered for a determination of “No Further Action” by Ecology. LIMITATIONS We have prepared this environmental sampling report for use by Shing Ledgerwood and her authorized agents. This report may be made available to regulatory agencies. Insight Geologic, Inc. services were completed in general accordance with the scope and limitations of our proposal. Within the limitations of scope, schedule and budget, our services have been executed in accordance with the generally accepted environmental science practices for Environmental Assessments at the time this report was prepared. No warranty or other conditions express or implied should be understood. Please refer to the Attachment titled “Report Limitations and Guidelines for Use” for additional information pertaining to use of this report.

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File No. 671−001−05 6


We appreciate the opportunity to be of continued service to Shing Ledgerwood on this project. Please contact us if you have questions regarding the information presented above, or if we may provide additional assistance.

Respectfully Submitted, Insight Geologic, Inc.

William E. Halbert, L.E.G., L.HG. Principal Hydrogeologist Attachments


FIGURES


TABLES

Benzene TolueneEthyl-

benzeneXylenes

S-2-9.0 2/21/2017 9 NS <10 <0.02 <0.1 <0.05 <0.15 <5.0

S-3-10.5 2/21/2017 10.5 NS <10 <0.02 <0.1 <0.05 <0.15 <5.0

1006 0.03 7 6 9 250

Notes:

1 Approximate Sample Locations shown on the attached Figure 2.

2 Chemical Analysis conducted by Libby Environmental, Inc. of Olympia, Washington.

3 Gasoline‐ Range Hydrocarbons analyzed by Northwest Method NWTPD‐Gx.

4 BTEX analyzed by EPA Method 8260c.

5 Lead analyzed by EPA Method 7010 Series.

6 Gasoline‐range petroleum hydrocarbon cleanup levels in soil are 30 mg/kg when benzene is detected and 100 mg/kg when benzene is not detected.

mg/kg = milligrams per killogram

MTCA = Model Toxics Control Act EPA = Environmental Protection Agency

Bold indicates value detected. Shading indicates value greater than the MTCA Method A cleanup level.

Table 1Soil Field Screening and Chemical Analytical Data

R Corner GroceryClallam County, Washington

671-001-05

MTCA Method A

Total Lead5

(mg/kg)

BTEX4

(mg/kg)Sample ID1, 2 Sample Date

Depth(ft bgs)

Water Sheen Field

Screening

Gasoline Range Petroleum

Hydrocarbons3

(mg/kg)

Benzene TolueneEthyl-

benzeneXylenes

W-1-022117 2/21/2017 <100 <1.0 <2.0 <1.0 <2.0 7.4

W-2-022117 2/21/2017 <100 <1.0 <2.0 <1.0 <2.0 8.7

W-3-022117 2/21/2017 <100 <1.0 <2.0 <1.0 <2.0 14

W-4-022117 2/21/2017 <100 <1.0 <2.0 <1.0 <2.0 <5.0

W-5-022117 2/21/2017 <100 <1.0 <2.0 <1.0 <2.0 <5.0

1,0006 5 1,000 700 1,000 15

Notes:

1 Approximate Sample Locations shown on the attached Figure 2.

2 Chemical Analysis conducted by Libby Environmental, Inc. of Olympia, Washington.

3 Gasoline‐ Range Hydrocarbons analyzed by Northwest Method NWTPD‐Gx.

4 BTEX analyzed by EPA Method 8260c.

5 Lead analyzed by EPA Method 7010 Series.

ug/L = micrograms per Liter

MTCA = Model Toxics Control Act EPA = Environmental Protection Agency

Bold indicates value detected. Shading indicates value greater than the MTCA Method A or Method B cleanup level.

6 Gasoline‐range petroleum hydrocarbon cleanup levels in groundwater are 800 µg/L when benzene is detected and 1,000 µg/L when benzene is not

detected.

Table 2Groundwater Chemical Analytical Data

R Corner GroceryClallam County, Washington

671-001-05

MTCA Method A Cleanup Level

Sample ID1, 2 Sample Date

Gasoline Range Petroleum

Hydrocarbons3

(ug/L)

BTEX4

(ug/L) Total Lead5

(ug/L)


ATTACHMENT A

EXPLORATION LOGS


ATTACHMENT B

LABORATORY ANALYSES RESULTS

Phone (360) 352-2110 • Fax (360) 352-4154 • [email protected]

Libby Environmental, Inc. 4139 Libby Road NE • Olympia, WA 98506-2518

March 7, 2017

Bill Halbert


1015 East Fourth Ave

Olympia, WA 98506

Dear Mr. Halbert:

Please find enclosed the analytical data report for the R Corner Project located in Port

Angeles, Washington.

The results of the analyses are summarized in the attached tables. Applicable detection

limits and QA/QC data are included. The sample(s) will be disposed of in 30 days unless

we are contacted to arrange long term storage.

Libby Environmental, Inc. appreciates the opportunity to have provided analytical

services for this project. If you have any further questions about the data report, please

give me a call. It was a pleasure working with you on this project, and we are looking

forward to the next opportunity to work together.

Sincerely,

Sherry L. Chilcutt

Senior Chemist

Libby Environmental, Inc.

Libby Environmental, Inc. Chain of Custody Record wwvv.LibbyEnvironmental.com

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Libby Environmental, Inc. 4139 Libby Road NE

Olympia, WA 98506

R CORNER PROJECT Phone: (360) 352-2110

Insight Geologic FAX: (360) 352-4154

Port Angeles, Washington Email: [email protected]

Libby Project # L170222-2

Client Project # 671-001-05

Sample Date Benzene Toluene Ethylbenzene Xylenes Gasoline Surrogate

Number Analyzed (µg/l) (µg/l) (µg/l) (µg/l) (µg/l) Recovery (%)

Method Blank 2/23/17 nd nd nd nd nd 126

LCS 2/23/17 105% 117% 99

W-1-022117 2/23/17 nd nd nd nd nd 92

W-2-022117 2/23/17 nd nd nd nd nd 109

W-3-022117 2/23/17 nd nd nd nd nd 118

W-4-022117 2/23/17 nd nd nd nd nd 93

W-5-022117 2/23/17 nd nd nd nd nd 97

W-5-022117 Dup 2/23/17 nd nd nd nd nd 115

W-4-022117 MS 2/23/17 112% 124% 113

W-4-022117 MSD 2/23/17 111% 121% 108

Practical Quantitation Limit 1.0 2.0 1.0 2.0 100

Analyses of Gasoline (NWTPH-Gx) & BTEX (EPA Method 8260C) in Water

"nd" Indicates not detected at the listed detection limits.

"int" Indicates that interference prevents determination.

ACCEPTABLE RECOVERY LIMITS FOR SURROGATE (Toluene-d8): 65% TO 135%

ANALYSES PERFORMED BY: Paul Burke

Page 1 of 7


Olympia, WA 98506






Sample Date Lead

Number Analyzed µg/L

Method Blank 2/26/17 nd


W-1-022117 2/26/17 7.4

W-2-022117 2/26/17 8.7

W-3-022117 3/6/17 14

W-4-022117 2/26/17 nd

W-5-022117 2/26/17 nd

Practical Quantitation Limit 5.0

Analyses of Total Lead in Water by EPA 7010 Series


ANALYSES PERFORMED BY: Dirk Peterson

Page 2 of 7


Olympia, WA 98506






Sample Date Lead

Number Analyzed (% Recovery)

LCS 2/26/17 94%

L170222-3 MS 2/26/17 112%

L170222-3 MSD 2/26/17 109%

RPD 2/26/17 3%

ACCEPTABLE RECOVERY LIMITS FOR MATRIX SPIKES: 75%-125%


QA/QC for Lead in Water by EPA 7010 Series

ACCEPTABLE RPD IS 20%

Page 3 of 7


Olympia, WA 98506






Sample Date Lead


LCS 3/6/17 98%

L170222-3 MS 3/6/17 112%

L170222-3 MSD 3/6/17 114%

RPD 3/6/17 2%

QA/QC for Lead in Water by EPA 7010 Series




Page 4 of 7


Olympia, WA 98506






Sample Date Benzene Toluene Ethylbenzene Xylenes Gasoline Surrogate

Number Analyzed (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) Recovery (%)

Method Blank 2/23/17 nd nd nd nd nd 126

LCS 2/23/17 105% 117% 99

S-2-9.0 2/23/17 nd nd nd nd nd 96

S-3-10.5 2/23/17 nd nd nd nd nd 135

S-5-8.0 MS 2/23/17 98% 131% 126

S-5-8.0 MSD 2/23/17 106% 111% 86

Practical Quantitation Limit 0.02 0.10 0.05 0.15 10

Analyses of Gasoline (NWTPH-Gx) & BTEX (EPA Method 8260C) in Soil

ANALYSES PERFORMED BY: Paul Burke

ACCEPTABLE RECOVERY LIMITS FOR SURROGATE (Toluene-d8): 65% TO 135%


"int" Indicates that interference prevents determination.

Page 5 of 7


Olympia, WA 98506






Sample Date Lead

Number Analyzed (mg/kg)


S-2-9.0 2/26/17 nd

S-3-10.5 2/26/17 nd

Practical Quantitation Limit 5.0

Analyses of Total Lead in Soil by EPA Method 7010 Series



Page 6 of 7


Olympia, WA 98506






Sample Date Lead


LCS 2/26/17 114%

L170222-6 MS 2/26/17 115%

L170222-6 MSD 2/26/17 109%

RPD 2/26/17 5%


QA/QC for Lead in Soil by EPA Method 7010 Series



Page 7 of 7


ATTACHMENT C

REPORT LIMITATIONS AND GUIDELINES FOR USE

I n s i g h t G e o l o g i c , I n c . L i m i t a t i o n s

ATTACHMENT C

REPORT LIMITATIONS AND GUIDELINES FOR USE1 This appendix provides information to help you manage your risks with respect to the use of this report. ENVIRONMENTAL SERVICES ARE PERFORMED FOR SPECIFIC PURPOSES, PERSONS AND PROJECTS

Insight Geologic, Inc. has performed environmental sampling and analytical services for Shing Ledgerwood (Client). Our services were performed in general accordance with the scope and limitations of our proposal. This report has been prepared for use by the Client and their authorized agents. This report may be made available to other agencies for review. This report is not intended for use by others, and the information contained herein is not applicable to other sites. Insight Geologic, Inc. structures our services to meet the specific needs of our clients. For example, an environmental site assessment study conducted for a property owner may not fulfill the needs of a prospective purchaser of the same property. Because each environmental study is unique, each environmental report is unique, prepared solely for the specific client and project site. No one except the Client should rely on this environmental report without first conferring with Insight Geologic. This report should not be applied for any purpose or project except the one originally contemplated. THIS ENVIRONMENTAL REPORT IS BASED ON A UNIQUE SET OF PROJECT-SPECIFIC FACTORS

We considered a number of unique, project-specific factors when establishing the scope of services for this project and report. Unless Insight specifically indicates otherwise, do not rely on this report if it was:

not prepared for you,

not prepared for your project,

not prepared for the specific site explored, or

completed before important project changes were made.

If important changes are made to the project or site after the date of this report, Insight Geologic, Inc. should be retained to review our interpretations and recommendations and to provide written modifications or confirmation, as appropriate. RELIANCE CONDITIONS FOR THIRD PARTIES

If a lending agency or other parties intend to place legal reliance on the product of our services, we require that those parties indicate in writing their acknowledgement that the scope of services provided, and the general conditions under which the services were rendered including the limitation of professional liability, are understood and accepted by them. This is to provide us with reasonable protection against open-ended liability claims by third parties with whom there would otherwise be no contractual limits to their actions.

1 Developed based on material provided by ASFE, Professional Firms Practicing in the Geosciences; www.asfe.org .

I n s i g h t G e o l o g i c , I n c . L i m i t a t i o n s

HISTORICAL INFORMATION PROVIDED BY OTHERS

Insight Geologic makes no warranties or guarantees regarding the accuracy or completeness of information provided or compiled by others. The information presented in this report is based on the above-described research and a single recent site visit. Insight has relied upon information provided by others in our description of historical conditions and in our review of regulatory databases and files. The available data do not provide definitive information with regard to all past uses, operations or incidents at the site or adjacent properties. ENVIRONMENTAL REGULATIONS ARE ALWAYS EVOLVING

Some substances may be present in the site vicinity in quantities or under conditions that may have led, or may lead, to contamination of the subject site, but are not included in current local, state or federal regulatory definitions of hazardous substances or do not otherwise present current potential liability. We cannot be responsible if the standards for appropriate inquiry, or regulatory definitions of hazardous substance, change or if more stringent environmental standards are developed in the future. SITE CONDITIONS CAN CHANGE

This environmental report is based on conditions that existed at the time the study was performed. The findings and conclusions of this report may be affected by the passage of time (for example, a Phase I ESA report is typically applicable for 180 days), by events such as a change in property use or occupancy, or by natural events, such as floods, earthquakes, slope instability or ground water fluctuations. Always contact Insight before applying this report so that Insight may evaluate reliability of the report to changed conditions. READ THESE PROVISIONS CLOSELY

Some clients, design professionals and contractors may not recognize that the geoscience practices (geology and environmental science) are far less exact than other engineering and natural science disciplines. This lack of understanding can create unrealistic expectations that could lead to disappointments, claims and disputes. Insight includes these explanatory “limitations” provisions in our reports to help reduce such risks. Please confer with Insight Geologic if you are unclear how these “Report Limitations and Guidelines for Use” apply to your project or site. GEOTECHNICAL, GEOLOGIC AND ENVIRONMENTAL REPORTS SHOULD NOT BE INTERCHANGED

The equipment, techniques and personnel used to perform an environmental study differ significantly from those used to perform a geotechnical or geologic study and vice versa. For that reason, a geotechnical engineering or geologic report does not usually relate any environmental findings, conclusions or recommendations; e.g., about the likelihood of encountering underground storage tanks or regulated contaminants. Similarly, environmental reports are not used to address geotechnical or geologic concerns regarding a specific project.

environmental sampling report - wa

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