WORK PLANS - Laserfiche WebLink

Home Browse Search

sow WORKPLAN FOR EXCAVATION OF CONTAMINATED SOIL Waterloo Liquor 2512 E. Waterloo Road Stockton,CA 1.0 INTRODUCTION Waterloo Liquor is a convenience store and gasoline station located at 2512 E. Waterloo Road in Stockton,California(Figure 1). Unleaded gasoline is stored in three 12,000-gallon underground storage tanks and is dispensed from a single dispenser island,which partially covers the tanks(Figure 2). The tanks are single-walled and must be removed prior to the 1998 deadline.The owner of the property,Mr. Heng Chea, intends to immediately replace the tanks with one 12,000-gallon and one 15,000-gallon tank,which will be located to the east of the drive-through island. There has been no previous environmental investigation at this site,and it is unknown whether any unauthorized leaks have occurred in the past. In the event thai contamination is discovered during the removal,however,interim remediation will be conducted in order to minimize delays and costs. The purpose of this work plan is to describe the proposed remediation procedure. 2.0 PROCEDURES The tank removal and associated soil excavation will be performed by Bob Evans Trucking under the supervision of Hoblitzell & Associates. An excavator will be used to expose the tanks, and the near-surface soil will be segregated and stockpiled separately from the soil that surrounds and underlies the tanks. After the Stockton Fire Department has certified that the tanks have been adequately prepared for removal, Husky Crane will remove the tanks. They will be cleaned and inspected for holes and petroleum staining before being placed on a flatbed truck and transported to a disposal facility. Aller the tanks have been removed, the excavator will deepen the excavation approximately 2 feet and soil samples will be collected as directed by a representative of PHSIEHD. A maximum of nine samples, three beneath each tank, will be collected from the excavator bucket using a slide hammer loaded with clean brass sample sleeves. These will be capped, sealed, and placed in a cooled ice chest for subsequent laboratory analysis. While these samples are being collected, Upgradient will screen the'excavation with a photo-ionization detector and examine the floor and sidewalls for petroelum stains and gasoline odors. If evidence of residual contamination is observed, Evans will be directed to deepen or extend the excavation as necessary to remove it. The exact dimensions of the excavation and the amount of soil to be removed are unknown at this time, but we estimate that the total volume will be less than 500 cubic yards. If we find Ghat the amount of