ARCHIVED REPORTS XR0008636 - Laserfiche WebLink

Home Browse Search

PROBLEM ASSESSMENT REPORT 1606 South D Dorado Strait Stockton Cahtorraa 2 O BACKGROUND 2 1 Site Description The subject site is located between South EI Dorado Street and Center Street in Stockton, San Joaquin County, California (Figure 1 ) The site is situated in a commercial/residential/light industrial area of southern Stockton, bound on the north by East 2nd Street, on the east by South E1 Dorado Street, on the south by a car wash facility, and on the west by Center Street The Exxon service station is presently inactive with no operating facilities The service station formerly retailed regular-leaded, regular-unleaded, and extra-unleaded gasolrnes The site currently consists of an abandoned building and canopy Previously, the site had three single-walled steel underground storage tanks (UST) 10,000-gallon extra-unleaded, 10,000-gallon regular-unleaded, and 10,000-gallon regular-leaded gasoline tanks (Figure 2) In June 1992, the three UST were removed along with associated piping 2 2 . Previous Investigation Quarterly groundwater monitoring and sampling has been conducted at the site since July 1991 The last quarterly report was dated May 7, 1993, and included sampling results from March 25, 1993 ' Previous site investigations include the following • On February 5, 1991 , a ground penetrating radar (GPR) survey was ' performed by NORCAL Geophysical Consultants, Inc , of Petaluma, California The survey was performed in the area of the former UST basin to locate existing underground facilities prior to drilling soil borings Upon completion of the GPR survey, two soil borings were drilled on February 22, 1991 , at an angle of 30 degrees from vertical, adjacent to and beneath the UST (Figure 2) The actual vertical depth penetrated by I the borings was approximately 53 feet bs Soil samples collected from the two borings were analyzed for total petroleum hydrocarbons (TPH), as gasoline, benzene, toluene, ethylbenzene, and total xylenes (BTEX), ' ethylene dibromide (EDB), 1 ,2-dichloroethane, and total lead Investigation results were reported by Aegis to Exxon in a "Pre-Tank Replacement Site Assessment Results Report," dated March 5, 1991 TPH and BTEX analytical results are summarized in Table 1 ' 91-044A PAR 3