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it Underground Storage Tank Removal Report - September 1998 NATIONAL FREIGHT 2850 Loomis Road, Stockton, California 1 1.0. INTRODUCTION At the request of Mr. Daniel Folcher of National Freight,Advanced GeoEnvironmental,Inc. (AGE) has prepared the enclosed report for removal of two steel underground storage tank (UST) at 3112 Loomis Road(the site) in Stockton, California. The location of the site is illustrated on Figure 1; a plan of the site is illustrated on Figure 2. UST removal procedures were performed in accordan a with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and San Joaquin County Fire Prevention (CFP) guidelines and regulations for the removal of USTs. Copies of PHS-EHD and CFP tank removal permits are included with Appendix A. 2.0. PROCEDURES Two 12,000-gallon diesel USTs(Tank No. 1 and Tank No. 2),two fuel dispenser and all associated product piping were removed from the site on 29 September 1998. Upon removal of the USTs, soil samples were collected from the floor of the excavation by representatives of Alpha Analytical Laboratories,Inc. (AAL)of Ukiah, California. On 13 N vember 1998, soil samples were collected beneath the former fuel dispenser island area by a representative of Precision Enviro-tech Analytical Laboratory (PEAL). 2.1. UNDERGROUND STORAGE TANK REMO AL ACTIVITIES On 28 September 1998, a 710 John Deer backhoe/loader was utilized to expose the USTs at the site (see Figure 2). Soil removed during excavation activities was stockpiled in a southeast section at the site and covered with plastic sheeting. Each UST measured 33 feet in length and 8 feet in di eter. The excavation cavity was measured at approximately 25 feet in width by 40 feet in length. Each UST was buried beneath approximately 4 feet of backfill;the bottom of each UST was measured at 12 feet below surface grade (bsg). Prior to excavation activities, an estimated 750 gallons of diesel fuel remained in both USTs. On 28 August 1998, each UST was triple rinsed u ilizing a pressure washer as part of tank decontamination procedures. During decontaminatio activities, approximately 850 gallons of rinsate/diesel fuel were pumped out of the USTs and i to a mobile vacuum truck supplied by Nor Cal Oil, Inc. and hauled offsite to Industrial Service iI Co., an EPA-approved hazardous waste facility. Documentation and uniform hazardous waste manifest for the rinseate material is contained Advanced GeoEnvironmental,Inc.