2923 RUCKER AVE 2025-01-30 - Laserfiche WebLink

Project No. 096-24516 November 13,2024 Page No. 2 spoon. The sample jars were completely filled with no remaining headspace. The sample jars were labeled with the project name, number, and the sequential sample number. Following labeling, the samples were placed in an ice chest with synthetic ice and maintained at a temperature of approximately 4° Celsius. A chain-of-custody form was completed at the end of the sampling day to document the sample possession from the point of collection to the time of receipt by the laboratory. There was no visible groundwater in the tank removal excavation. 1.3 Laboratory Analysis The sample was delivered to Friedman and Bruya, Inc. located in Seattle, Washington under chain-of- custody protocol for analysis. This laboratory is a Washington State-accredited laboratory. The samples were analyzed for the following: • Total Petroleum Hydrocarbon(TPH) in the Gas-Extended by Method NWTPH-Gx; • Total Petroleum Hydrocarbon(TPH)in the Diesel-Extended by Method NWTPH-Dx; • Benzene,toluene, ethylbenzene,and total xylenes(BTEX)by Method 8021B The laboratory analytical data report and chain-of-custody form are provided in Appendix A. 1.4 Laboratory Sample Results 1.4.1 Soil Sample Table 1 lists the summary of hydrocarbon and organic analytical results for the samples. The TPH results for gasoline, diesel and motor oil were above available Model Toxics Control Act (MTCA) Method A cleanup action levels. The BTEX results were all at non-detectable levels or were below available MTCA Method A cleanup action levels. Table 1—Summary of Hydrocarbon and Organic Analytical Data—Soil,November 11,2024 2914 Rucker Avenue Total Petroleum H drocarbons „ N Sample Depth Sample Sample � Number (in.) Type Material o � O c S5 6-12 Composite Soil 850 850 1 4000 <0.028 <0.1 0.88 0.61 S6 —6' <Surface Composite Soil 1800 2600 8,800 <0.028 <0.1 1.5 1.1 MTCA Method A Cleanup Levels(Soil) 100 2,000 2,000 0.03 7 6 9 Notes: All results reported in milligrams per kilogram(mg/kg),or parts per million(ppm) Bolded=Sample exceeds applicable cleanup level/standard MTCA=Model Toxics Control Act x=The sample chromatographic pattern does not resemble the fuel standard used for quantitation.