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.STATE OF CAU7FCPNIA GEORGE DEUKMEJIAN.Governor <br /> CALIFORNIA REGIONAL WATE DUALITY CONTROL BOARD— t ,. <br /> CENTRAL VALLEY REGION <br /> 3433 ROUTIER ROAD -•� " ' <br /> SACRAMENTO,CA 95827-3098 <br /> aL <br /> • , _ , �, �; 193 <br /> 18 August 1988 EI TAL {iEALTH <br /> ENV1k�'„ �ERVICES <br /> Mr. John Margowski <br /> Wickland Oil Company <br /> Environmental Affairs <br /> P.O. Box 13648 <br /> Sacramento, CA 95853 <br /> ENVIRONMENTAL SITE ASSESSMENTS FOR REGAL STATIONS (WICKLAND OIL <br /> COMPANY) WITH PETROLEUM HYDROCARBON CONTAMINATION <br /> Thank you for submitting the Environmental Site Assessments <br /> (ESAs) for the following Regal Stations, found to have <br /> hydrocarbon contamination: <br /> 1) Regal Station #501, 2549 Marconi Avenue, <br /> Sacramento. <br /> 2) Regal Station #503 , 5 West Main Street, Woodland <br /> 3) Regal Station #510, 1000 Douglas Boulevard, <br /> Roseville <br /> 4) Regal Station #511, 2816 West Capitol Avenue, West <br /> Sacramento <br /> 5) Regal Station #515, 5601 Franklin Boulevard, <br /> Sacramento <br /> 6) Regal Station #523 , 6200 Fair Oaks Boulevard, <br /> Carmichael <br /> 7) Regal Station #533 , 8228 Auburn Boulevard, Citrus <br /> Heights <br /> 8) Regal Station #603 , 6425 Pacific Avenue, Stockton <br /> The ESAs demonstrate that petroleum hydrocarbons have leaked into <br /> the environment front the storage or distribution systems. A <br /> major concern is that the Soil borings, generally, are located <br /> too far from the storage system to effectively characterize the <br /> site. The distance makes it possible for soil contamination to <br /> be undetected; especially those in sandy soils where vertical <br /> migration is the primary concern. It should be noted that the <br /> migration of contaminants in the unsaturated zone does not <br /> necessarily follow the same direction as the ground water beneath <br /> it. If the lateral migration of the contaminants were to move <br /> opposite the direction of the assumed ground water gradient, <br /> contamination would be undetected. For these reasons, we <br /> recommend that initial investigative soil borings: <br /> 1) Be drilled within 10 feet of the underground tank <br /> storage system; <br /> 2) Be drilled around the perimeter of the storage system, <br />