Appendix A: Excerpt from June 3, 2013 Technical Memorandum by Feigi & Associates, Inc.

Methods and Results of Additional Sampling Methodology Assessment of

Groundwater in Monitoring Wells MW-3 and MW-7 - Former Sunset and Pacific

Pride Sites

Sampling Methodology

On May 10, 2013 FAI performed side-by-side sampling of groundwater in monitoring

wells MW-3 and MW-7 utilizing both low flow and bailer purge methods.

Sampling Results

General groundwater analytical results for the May 10, 2013 comparative sampling methodology assessment, are presented below.

MW-3

Laboratory analysis for NWTPH-Dx of the low flow purge sample (MW3-P),

indicated diesel at 8.69 milligrams per liter (mg/L) and non-detect for oil.

Laboratory analysis for NWTPH-Dx of the bailer purge sample (MW3-B),

indicated diesel at 253 mg/L and non-detect for oil.

Laboratory analysis NWTPH-Gx indicated similar detections of gasoline range

hydrocarbons in both the low flow (MW3-P) and bailer (MW3-B) purge method

samples. Sample detections did not exceed the applicable DEQ Risk Based

Concentrations (RBCs) established for the site in either sample.

Laboratory analysis for PAHs did not indicate any constituent in excess of

applicable RBCs established for the site in either the low flow (MW3-P) or bailer

(MW3-B) purge samples. However, the sample collected utilizing the bailer

purge and sample method (MW3-B) indicated a very large increase in the levels

of detection compared to the sample collected low flow purge and sample method

(MW3-P).

Laboratory analysis for VOCs indicated consistent levels of detection for both the

low flow (MW3-P) and bailer (MW3-B) purge samples. VOC constituents that

were detected were consistent with historic results and did not exceed applicable

RBCs established for the site in either sample.

Laboratory analysis for Total and Dissolved Metals indicated consistent levels of

detection for both the low flow (MW3-P) and bailer (MW3-B) purge samples

from both wells. Metals that were detected did not exceed the applicable RBCs

established for the site in either sample.

MW-7

Laboratory analysis for NWTPH-Dx of the low flow purge sample (MW7-P),

indicated diesel at 2.12 mg/L and non-detect for oil.

Laboratory analysis for NWTPH-Dx of the bailer purge sample (MW7-B),

indicated diesel at 158 milligrams per liter (mg/L) and non-detect for oil.

Laboratory analysis NWTPH-Gx indicated a higher detection of gasoline range

hydrocarbons for the sample collected utilizing the bailer purge and sample

method (MW7-B). However, sample detections utilizing the low flow (MW7-P)

or bailer (MW7-B) purge and sample method did not exceed the applicable RBCs

established for the site and were consistent with historic results.

Laboratory analysis for PAHs did not indicate any constituent in excess of

applicable RBCs established for the site in either the low flow (MW7-P) or bailer

(MW7-B) purge samples. However, the sample collected utilizing the bailer

purge and sample method (MW7-B) indicated a large increase in the levels of

detection compared to the low flow purge and sample method.

Laboratory analysis for VOCs indicated consistent levels of detection for both the

low flow (MW7-P) and bailer (MW7-B) purge and sample methods. VOC

constituents that were detected were consistent with historic results and did not

exceed the applicable RBCs established for the site in either sample.

Laboratory analysis for Total and Dissolved Metals indicated consistent levels of

detection for both the low flow (MW7-P) and bailer (MW7-B) purge and sample

methods. Metals that were detected did not exceed the applicable RBCs

established for the site in either sample.