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APEX <br />ENVIR0TE[H,INt. <br />May 11, 2021 <br />Mr. Alan Buehler <br />Central Valley Regional Water Quality Control Board <br />11020 Sun Center Drive, Suite 200 <br />Rancho Cordova, California 95670 <br />11291 Pyrites Way, Suite B <br />Gold River, CA 95670 <br />www.apexenvirotech.com <br />Subject: Dispenser and Product Line Soil Sampling Results Report <br />Panella Trucking, Inc. <br />5000 East Fremont Street <br />Stockton, California <br />Apex Project No. PAN02.001 <br />Dear Mr. Buehler, <br />Apex Envirotech, Inc. (Apex) has been authorized by Panella Trucking, to submit this report <br />documenting soil sampling activities at the site. Apex personnel collected soil samples from <br />beneath seven fuel and motor oil dispensers and underground associated product lines from <br />above ground tanks as part of station upgrade activities being performed at the site. The <br />dispenser upgrades were performed by Walton Engineering of West Sacramento (Walton) and all <br />soil work was completed by Veltkamp Construction (Veltkamp). Site features and sample <br />collection locations are depicted on Figures 1 and 2. <br />SAMPLING SUMMARY OF FIELD ACTIVITY <br />On February 19, 2021, Apex personnel were onsite to collect soil samples from beneath the <br />former location of 7 dispensers and the associated product lines. The dispenser and product lines <br />had been removed by Walton prior to the arrival of Apex staff. Apex obtained 7 dispenser soil <br />samples at 4 feet below ground surface (bgs) (D-1 through D-7) and collected 18 product line <br />soil samples at 4 feet bgs PL -1 through PL -18 (Figure 2). <br />After receipt of the February 19, 2021 sample results (Table 1), Apex mobilized to the site on <br />March 9, 2021. Veltkamp over excavated soil in seven areas that exceeded the Environmental <br />Screening Levels (ESLs) for Motor Oil (1,600 mg/Kg). The seven areas were excavated to <br />approximately 7 -foot bgs that exceeded the ESLs for Motor Oil (Figure 3). <br />After receipt of the results for the seven soil samples collected on March 9, 2021, Apex again <br />mobilized to the site on March 19, 2021. Veltkamp over excavated one area that exceeded the <br />ESLs for Motor Oil EX -1-7 feet bgs. This area was excavated to 10 feet bgs and one soil sample <br />was collected (EX -1-10) at 10 feet bgs. <br />(916) 851-0174 <br />