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(000- <br /> \ <br /> KL E/NFEL OER <br /> Bright People.Right Solutions. <br /> July 25, 2022 <br /> Kleinfelder Project No. 20224378.001 A <br /> Costco Wholesale Corporation <br /> c/o MG2 <br /> 1101 Second Ave, Suite 100 <br /> Seattle, Washington 98101 <br /> Attention: Mr. Kristopher Artz, Associate <br /> Subject: Gasoline Station Upgrade Soil Sampling Report <br /> Costco Wholesale Warehouse No. 658 <br /> 3250 West Grant Line Road <br /> Tracy, California 95377 <br /> Dear Mr. Artz: <br /> Kleinfelder is pleased to provide Costco Wholesale Corporation (Costco) this Gasoline Station <br /> Upgrade Soil Sampling Report pertaining to the recent gasoline station expansion and upgrade <br /> activities performed at Costco's existing Warehouse Number (No.) 658 facility (the Site) at <br /> 3250 West Grant Line Road in Tracy, San Joaquin County, California. Figure 1 provides a map <br /> showing the Site location. <br /> Pursuant to the request of MG2, Costco's architect, and Jones Covey, Costco's general <br /> contractor, on Costco's behalf, Kleinfelder collected soil samples from beneath where six former <br /> fuel dispensers and associated fuel system piping at the Site were removed. The sampling was <br /> performed under the direction of San Joaquin County Environmental Health Inspector <br /> Carol Presto. This letter report provides documentation of the soil sampling activities and presents <br /> the analytical results of the sampling and Kleinfelder's conclusions and recommendations based <br /> on them. <br /> In summary, and as further detained in the following sections of this letter, Kleinfelder collected <br /> samples of "native" soil beneath pea gravel where fuel dispensers were removed from the Site <br /> and at intervals of approximately 20 linear feet beneath pea gravel in trenches from which fuel <br /> system piping was removed. Removed pea gravel and soil were screened in the field by <br /> Kleinfelder for the presence of total volatile organic vapors, and soil and pea gravel samples were <br /> submitted to a subcontracted analytical laboratory for analysis, using United States Environmental <br /> Protection Agency (US EPA) methodology, of gasoline-range total petroleum hydrocarbons <br /> (TPH-g) as total purgeable petroleum hydrocarbons, volatile organic compounds (VOCs) <br /> including fuel oxygenates, and total lead. Based on Kleinfelder's field observations, an absence <br /> of total volatile organic vapors in excavated pea gravel and soil, and the analytical results, which <br /> indicated total purgeable petroleum hydrocarbons and VOCs were not detected in the samples at <br /> concentrations at or above their respective practical quantitation limits (PQLs) and total lead <br /> concentrations are below its human health risk-based screening level, there is no evidence of a <br /> fuel release at the sampled locations. As such, Kleinfelder recommends no further action other <br /> than submitting this letter to San Joaquin County. <br /> 20224378.001A/LH22R143097 Page 1 of 4 July 25, 2022 <br /> Copyright 2022 Kleinfelder <br /> 24411 Ridge Route Dr., Suite 225, Laguna Hills, CA 92618 p 1949.727.4466 f 1949.727.9242 <br />