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October 16, 1998 <br />Quik Stop Markets, Inc. <br />4567 Enterprise Street <br />Fremont, California 94538 <br />SITE: QUIK STOP MARKET NO. 124 <br />505 NORTH MAIN STREET <br />MANTECA, CALIFORNIA <br />RE: SUMMARY OF SOIL SAMPLING ACTIVITIES <br />Dear Mr. Karvelot: <br />Project No. 41-0184 <br />At the request of Quik Stop Markets, Inc., Alton Geoscience performed soil sampling activities at Quik <br />Stop Market No. 124 located at 505 North Main Street in Manteca, California (Figure 1). On <br />October 1, 1998, three soil samples (D-1, D-2 and D-3) were collected from the excavation associated <br />with product dispenser replacement activities (Figure 2). On October 8, 1998, Alton returned to the <br />site to collect an additional deeper sample at location D-1 using an hand auger. <br />Soil samples were collected directly beneath the former dispensers locations (Figure 2). Soil samples <br />D-1 (3) and D-2 (3) were collected at a depth of three feet below grade (fbg) as requested by the San <br />Joaquin County Department of Environmental Health (SJCDEH). The deeper soil sample from <br />location D-1 was collected from a depth of 6.1 fbg. Soil sample D-3 (4) was collected at a depth of <br />four fbg, because a one -foot over -excavation of this area was required by the SJCDEH. <br />Soil samples were submitted to a state -certified laboratory and analyzed for total petroleum <br />hydrocarbons as gasoline (TPH-G) using EPA method modified 8015, benzene, toluene, ethylbenzene, <br />total xylenes (BTEX) using EPA Method 8020, and oxygenated compounds using EPA Method 8260. <br />Copies of the official laboratory reports and chain of custody records are attached to this letter report. <br />No TPH-G, BTEX, or oxygenated compounds were detected above laboratory reporting limits in soil <br />samples collected from D-1, D-2, or D-3, with the exception of total xylenes (0.15 mg/kg) and MTBE <br />(190 ug/kg) in sample D-1(3). While MTBE was detected in D-1(3), it was not present above <br />laboratory reporting limits in the deeper soil sample D-1(6.1). <br />I R V I N E - L I V E R M 0 R E - N 0 R T H R 1 D G E - S A N D I E G O - SANTA FE SPRINGS <br />30A Lindbergh Avenue - Livermore, California 94550-9503 - (925) 606-9150 - FAX (925) 606-9260 - www.altongeo.com <br />