ARCHIVED REPORTS XR0001762 - Laserfiche WebLink

Home Browse Search

V 3330 data Qrive Delta MBAR 2 3 1995 Suite too Rancho Cordova, CA 95670 ® Environmental 916/638-2085 Consultants,Inc. ENVIRONMENTAL PEALTH FAX:916/638-8385 PERMIT/SERVICES March 21, 1995 Mr. Kenneth Earnest Ultramar Inc. 525 West Third Street Hanford, California 93230 Subject: Underground Storage Tank Removal and Soil Sampling Beacon Station No. 502 35 North Cherokee Lane Lodi, California Delta Project No. D093-907 Dear Mr. Earnest: Delta Environmental Consultants, Inc. (Delta), was authorized by Ultramar Inc. (Ultramar)to conduct soil sampling after the removal of underground fuel storage tanks at Beacon Station No. 502, located at 35 North Cherokee Lane, Lodi, San Joaquin County, California. This letter describes sampling activities and presents analytical results. The location of the site is shown in Figure 1 and a site map is included as Figure 2. Project Background The presence of petroleum hydrocarbons in soil beneath the site was detected during lining of underground fuel storage tanks in 1987. Since that time, investigative activities at the site have included the installation of five ground water monitoring wells, measurement of water levels in the wells to determine ground water flow direction, and sampling of the wells to evaluate ground water duality. Remedial activities included the installation of a soil vapor extraction system, which was in operation at the site from 1989 to 1992. Three soil borings (SB-1, SB-2, and SB-3) were drilled to approximately 50 feet below surface grade near the underground fuel storage tanks in April 1993. Analytical results indicated that soil samples collected from soil borings SB-1 and SB-2 did not contain detectable concentrations of petroleum hydrocarbons. The soil sample collected from soil boring SB-3 at a depth of 15 feet contained total petroleum hydrocarbons (TPH) as gasoline at a concentration of 1,100 milligrams per kilogram (mg/kg); however, a soil sample collected from the same boring at a depth of 20 feet contained TPH as gasoline at a concentration of only 3.3 mg/kg, and samples collected at deeper depths did not contain detectable concentrations of petroleum hydrocarbons. Results of this investigation were presented in Delta's Subsurface Investigation Report, dated July 27, 1993. Scone or Work On February 28, 1995, three steel underground fuel storage tanks and the associated product distribution Iines were removed from the site, including two 12,000-gallon tanks which had previously contained regular unleaded and unleaded plus gasoline, and 10,000-gallon tank which had Providing a Competitive Edge