REMOVAL 2011 CLOSURE IN PLACE - Laserfiche WebLink

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1.0 INTRODUCTION Professional Service Industries, Inc. (PSI) has been retained by Farmington Mariposa Development Co., LLC to prepare this Workplan to perform in-place closure of an underground storage tank (UST) at the former service station at the northeast corner of E. Mariposa Road and Farmington Road in Stockton, California (Figure 1). 1.1 PROJECT LOCATION AND DESCRIPTION The Subject Property is located at the northeast corner of East Mariposa Road and Farmington Road in Stockton, San Joaquin County, California. This property is defined by the County of San Joaquin Assessor's Office as Parcel Numbers (APNs) 173-040-33, 173-040-34, 173-040- 35, and 173-040-36. The Subject Property formerly consisted of six single-story buildings totaling approximately 4,000 square-feet. The property at 2040 East Mariposa Road was constructed in the late 1960s and operated since at least 1970 as Snow-White Drive-in restaurant. The property at 2064 East Mariposa Road was constructed in early 1957 and operated since at least 1985 as Barker's Auto Upholstery. The property at 2088 East Mariposa Road was constructed in the early 1960's as a service station and then operated as a smog center from 2000 to 2010. The northeast ` portion of the Subject Property at 2811 Farmington Road was undeveloped with two mobile storage containers and several unused vehicles on the property. A single family residence and a residential trailer was located on the northwest portion of the Subject Property. All of the buildings were demolished in 2010 for the construction of a Walgreens Drug Store. On October 20, 2011, a single-wall steel 1,000 gallon diesel UST was uncovered during the excavation of a storm-drain line for the proposed Walgreens Drug Store. The UST is located on the former service station site and is located underneath the sidewalk along East Mariposa Road, The UST was checked and determined to be empty with no piping specifically identified with this UST. The top of the UST is approximately 2 feet below grade with the eastern side of the UST excavated to approximately 4 feet below land surface. No indication of hydrocarbon impacted soil associated with this UST has been noted. However, the former service station was a Leaking Underground Storage Tank (LUST) site that was granted closure on August 19, 1996. It appears that historically, this UST was probably part of the former service station that appears to have been remodeled in the 1960s with new UST locations. The UST was located underneath the sidewalk and adjacent to East Mariposa Road. Additionally, there is a natural gas line located within 5 feet of the top of the UST. Due to the hazards associated with the presence of East 20f ariposa Road and the natural gas line, PSI is requesting that the County allow for in-place closure the UST. i i