WORK PLANS_FILE 2 - Laserfiche WebLink

Home Browse Search

Remedial Action Work Plan - In-Well Air Sparging LARRY'S AUTO 308 North Grant Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Charles Skobrak, the property owner, Advanced GeoEnvironmental, Inc. (AGE) has prepared this work plan for ground water remediation at 308 North Grant Street, Stockton, California (site). The location of the site is illustrated in Figure 1. A plan of the site is illustrated in Figure 2. Based on the results of In-Situ Air Sparging Feasibility Pilot Test Report,AGE recommends installation of an in-well aeration system for remediation of ground water in the former northeast underground storage tank(UST) areapnd based on the initial results within the the southern UST area. The scope of work includes installation of two in-well air-sparging �(stipper)points,within two extraction wells(EW-1 and EW-2)to operate in conjunction with the soil vapor extraction (SVE) remediation system at the site. The enclosed remedial action work plan was prepared in accordance with a San Joaquin County Environmental Health Department(SJCEHD)letter directive on 02 July 2010. The purpose of this work plan is to detail the design, installation and operation of an in-well air sparging system for shallow and deep ground water remediation. This work plan has been prepared in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) for investigation of UST sites. BACKGROUND The site is located on the northeast corner of the intersection of Grant Street and Miner Avenue. The site is currently operated as Larry's Auto Repair and was formerly operated as De Rollo Mazda. The property is occupied by a single building with attached canopy and a parking area. In 1987, one 1,000-gallon gasoline UST (Tank A) was removed from the northwest corner of the site. One 1,000-gallon gasoline UST and one 1,000-gallon diesel UST (Tanks B & C) were removed from beneath the sidewalk at the southeast corner of the site in 1990. Petroleum hydrocarbons were reported in soil samples collected beneath each UST. Feasibility studies are necessary to determine remedial action options for the site. The upper portion of the site section consists of silty clay and clayey silt with discontinuous sand lenses. The primary water baring unit, which can sustain ground water recharge, is located at a depth of 60 feet below surface grade (bsg); the current ground water table depth is approximately 30 feet bsg. The majority of the adsorbed contamination, with aromatic compounds is lo�Iated within the upper section of the site. 32 5 ' bsW Advanced GeoEnvironmental,Inc