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Initial Work Plan for Preliminary Site Assessment Former Mel l3okides Petroleum - Linden _; —ii 8203 East Highway 26, Stockton, California - DEC 0 1 ZOOO 1.0. INTRODUCTION ElIVIRWII`IU4i 1 I;LALI'r' 1'E PL ITfS f; ,,Icr� At the request ot'Mr. Nick Bokides of Mel Bokides Petrolcw11. .4clvw?cccl(j t)Frivironniental. Inc. (AGE) has prepared the enclosed Initial Work flan for Preliminary Site Assessment for 8-20; East Ilighvvav 26. Stockton. C'alif'ornia (site). The location of the site is illustrated on Figurc l and a plan ofthe site is illustrated on Figure 2, This Work Plan has been prepared as required by the San Joaquin County Public 1-lealth Services - Environmental Health Division (PHS-EI ID) by letter dated 21 September 2000. This work plan is prepared in accordance withthe Central Valley Regional Water Quality Control Board (C'VRV\.Q('B) -ttidelines for the subsurface investigation of underuround storage tanks (UST) sites. 2.0. BACKGROUND The silt== is hounded on the north by a residential property. The site is bounded on the cast by Alpine Road and hounded on the south by State Highway 26. Commercial properties are east and west of the site. A Lasoline station and mini-mart formerly occupied the site. Oil 07 May 1999. three USTs and associated piping and a dispenser island were removed from the site by Semco of Modesto. Six sarnples were collected hencath the US Two two soil samples vvcrc collected beneath the dispenser area and lonr laboratory composited soil samples werc collected from the excavated soil. The L!S'F were the apparent source of the unauthorized release of hydrocarhons. Total petroleum hydrocarbons quantified a5 grasoline (TPI I-g) was detected at concentrations up to 17,000 milliLrams per kilogram (mg/kg) beneath the northern end of the northern UST location (Tank#1). TPM-g xNas also detected beneath the southern end of the northern L'S"l' location at a concentration of 9.900 nn-/kg. Volatile aromatics (benzene, toluene. ethyl benzene and xylenes: BTEX) ,vcrc detected at concentrations up to x.000.000 micrograms per kilogram (uglkg) trom the same sample locations. Methyl tertiary butyl ether (M"TBH) and/or tertiary butanol (TBA) vverc detected in soil samples collected frons the former UST excavation and stockpiled soil at the site. The presents of MTBE, in the soil collected at the southern and northern end of the former Tankftl excavation indicates that an undetermined mass of MTBE remains at the site. The scope ol'vvork is haled on the detection of this mass ofMTBE and other petroleum Hydrocarbons. The removal of soil from these areas would reduce the documented MTBF. mass. if sufficient soil is removed from the impacted areas. Approsimatek 150 yards ofsoil were excavated during removal of the USTs, sampled and tilt:]] replaced into the excavation. Idranced GeoFriN iron menta I.Inc.