Laserfiche WebLink
06 December 2001 <br /> AGE-NC Project No. 99-0605 <br /> Page 2 of 6 <br /> On 30 December 1998, three USTs were removed from the site by Stockton Service Station <br /> Equipment Company, Inc. (SSSE). On 19 February 1999, SSSE excavated hydrocarbon-impacted <br /> soil from the former l'ST and dispenser area. AGE personnel were onsite to collect and field-screen <br /> soil samples and to direct digging procedures. Six soil samples were collected from. the floor and <br /> sidewalls of the excavation.~ Atter completion of the interim remediation, the excavation was <br /> backfilled with clean fill material. Based upon the detection of methyl tertiary butyl ether (MTBE) <br /> at concentrations as �reat as 14 mgikg in soil and at depth as great as 18 feet below surface `trade <br /> (bsg), AGE recommended further subsurface investigation at the site to assess MTBE the impact to <br /> sail and ground water. The MTBE-analytical results of the samples collected are shown in Tables I <br /> and 2. ✓ <br /> On 20 February 2001, four soil borings (B-1 through B-4) were advanced at the site as part of the <br /> on-going site assessment. MTBE was detected in soil samples 132-20, B2-30 and 132-40 at <br /> concentrations of 120 micrograms per milligram (��glmg), 1 200,Lg/mg and 63 ��%nag, respectively. <br /> Total petroleum hydrocarbons as gasoline (TPH-g), diesel (TPH-d } motor oil (TPH-mo), benzene, <br /> toluene, ethylbenzene, xylenes (BTEX) and di-isopropyl ether (DIPS), MTBE, ethyl tertiary-butyl <br /> ether (ETBE), tertiary-amyl methyl ether (TAME) and tertiary-butyl alcohol (TBA), methanol, <br /> ethanol, ethyl dibromide (EDB) and 1,2 - DCA were not detected above laboratory reporting limits <br /> in any of the soil samples submitted for analysis. <br /> {crab ground water sample B2 contained TPH-mo at a concentration of 360 micrornrams per liter <br /> while TPH-g, TPIt-d, .MTBE, BTEX, DIPE, ETBE, TAME, TBA, methanol, ethanol. EDB <br /> and 1,2-DCA were not detected above laboratory reporting limits. <br /> Analytical results of the soil samples are summarized in Tables 3 and 4. The analytical result of the <br /> ground water sample is summarized in "fable 5. <br /> 3.0. SCOPE OF WORK <br /> Based on analytical results of soil samples collected during the initial site assessment, the PHS-El ID <br /> has directed further assessment of the soil contamination and feasibility testing of soil vapor <br /> extraction at the site. Assessment activities will consist of the following tasks: <br /> • Permitting and pre-field work activities; <br /> • Soil sample collection and analysis; <br /> • Soil vapor extraction well installation; <br /> • Perforrnance of a soil vapor extraction pilot test and analysis of three soil vapor samples; <br /> • Report preparation. <br /> Vvanced GeaEnvirnnmental. Inc. <br />