ARCHIVED REPORTS_XR0011662 - Laserfiche WebLink

Home Browse Search

LM Quarterly Report - July 1998 FIRE STATION#3 1116 East First Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Stephen Chen of the City of Stockton, Advanced GeoEnvironmental, Inc. (AGE)has prepared the enclosed Quarterly Report for the Fire Station#3 at 1116 East First Street, ,,w Stockton, California (the site). The scope of work included the installation of one ground water monitoring well and conducting a ground water sampling event. The objective of the investigation was to determine the vertical extent of hydrocarbon-impacted soil and to assess the hydrocarbon impact to ground water at the site. The site and its,surroundings are illustrated on Figure 1. Structures,borings and well locations are shown on Figure 2. 'i The investigation was conducted in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Region'of the Regional Water Quality Control Board(CV-RWQCB) guidelines for the subsurface investigation of underground storage tank(UST) sites. 2.0. BACKGROUND 2.1. SITE DESCRIPTION The site-is located on First Street in south Stockton in an area of low topographic relief at an elevation of approximately 20 feet above sea level. The San Joaquin County Fair ground lies east of the site beyond Airport Way and the Southern Pacific Rail Road is west of the site. The site is an operating fire station. The surrounding land use in the vicinity of the site is residential and '— commercial. 2.2. UNDERGROUND STORAGE TANK REMOVAL AND ASSESSMENT - AGE has been informed that one underground storage tank(UST), dispenser and associated piping were removed from the site. Laboratory analysis of soil samples collected beneath the UST invert indicated a minor unauthorized release of hydrocarbons. Analysis of soil samples collected from 4a,,, borings established at the site have shown that petroleum impacted soil extends to 28 feet below surface grade(bsg). A leaching potential was calculated for the site by The Twining Laboratory(Twining).The potential impact of total petroleum hydrocarbons quantified as gasoline (TPH-g) on ground water was calculated to be 15,000 parts per billion:ppb(calculated as micrograms per liter)..Volatile.aromatic -` compounds(benzene,toluene, ethyl benzene and xylenes: BTEX)were also detected in the soil at depths as great as 28 feet. The leaching potential for BTEX compounds were also significant,with Advanced GeoEnviromnental,Inc.