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4UORUi <br /> M <br /> ENVIRONMENTAL CONSULTANTS,IN(. <br /> f <br /> October 9, 1992 , <br /> OEC 92-120-1W.ADD f� <br /> Mr. Terry Masters <br /> Sacramento Equipment Maintenance Company <br /> 2533 Connie Drive <br /> Sacramento, California 95815 <br /> i <br /> Subject: Addendum to Work Plan for Excavation of Hydrocarbon-Bearing Soil from <br /> Underground Storage Tank Cavity at A & M Market, 4579 East Acampo <br /> Road, Acampo, California. F� <br /> Dear Mr. Masters: <br /> At your request, Quorum Environmental Consultants, Inc. (Quorum), has prepared this <br /> addendum to our Work Plan dated July 27, 1992 for observing excavation of hydrocarbon- <br /> bearing soil at the subject site. The site is on the northwest corner of the intersection of , <br /> East Acampo Road and Highway 99 Frontage Road in Acampo, California. The location <br /> is shown on the Site Vicinity.Map, Plate 1. The approximate configuration of site facilities <br /> is depicted on the Generalized-Site Plan, Plate 2. <br /> Background <br /> F <br /> A geologist from Quorum was at the site on June 1.9, 1992, to observe Sacramento <br /> Equipment Maintenance Company(SEMC)remove three 8,000-gallon underground gasoline <br /> storage tanks. Mr. Eric Trevina of the San Joaquin County Local Health District (SJCLHD) <br /> was at the site during tank removal. The tanks were in generally good condition with no <br /> apparent holes. Following tank removal, our geologist) collected two soil samples from <br /> beneath each tank for a total of six below-tank samples. In addition, at Mr. Trevina's <br /> request, our geologist collected five discrete soil samples from two soil stockpiles; one <br /> sample (S-0619-1) was collected from a soil stockpile containing approximately 25 cubic <br /> yards, and four samples (S-0619-2 through -5) were collected from an approximate 100- <br /> cubic-yard stockpile. The stockpiles consistedof soil that had-been excavated from around <br /> the tanks prior to removal. The locations and designations of soil samples collected during <br /> tank removal are shown on Plate 2. i <br /> �i <br /> Soil samples were submitted to Coast-to-Coast Analytical Laboratory of Goleta, California <br /> (California Hazardous Waste Testing Laboratory Certificate No. 1204). Samples were <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, <br /> ethylbenzene, and total xylene isomers (BTEX) using modified Environmental Protection <br /> Agency (EPA) Method 8260; for ethylene dibromide (EDB) and 1,2-dichloroethane (EDC) <br /> using EPA Method 8240;'and for total lead using EPA Method 7420. Results of chemical <br /> analyses of soil samples collected during tank removal ;are shown in Table 1, Results of <br /> Chemical Analyses of Soil Samples. TPHg was detected in two of six samples collected <br /> 3050 FITECIRCLE SUITE 104 • SACRAMENTO, CA 45827 • TEL: 416.363.1900 FAM: 916.363.4912 1 <br />