Laserfiche WebLink
I <br /> File No.26M-2 <br /> 19 December 199, <br /> !a Page t <br /> 1.0 D.-l`RODUQnQN <br /> 1.1 Site Location <br /> i <br /> Me subject site is !ocated at 2651 S. Airport Way in Stockton, California 11. It is <br /> situates, in the center o:Section 13,Township I North, Range 6 East, Mount :.line and <br /> Meridian. It can be found on the Stockton West 7.5 minute quadrangle topeg,._. published C <br /> by the United States Geological Survey. � <br /> .a <br /> 1.2 Site History <br /> ' The Stockton Rainbo Baking facility had in the past utilized underground storage tanks to store <br /> fuel for their delivery vehicles. Historically,four underground fuel storage tanks had been operated <br /> ' at the facility. Three tanks were located in a cluster approximately 50 feet south of th.� - ^-�uthwest <br /> y corner of the bakery (see Figure 2). The other tank ivas located in the front parking lot of the <br /> bakery. <br /> The middle tank of the three tank cluster was decommissioned prior to 1986(exact date unknc;wn). <br /> The tank contents were removed and the tank was subsequently backfV'7� =tirh sand and left in <br /> place, The w stern-most tank remained operative up until December. In Precision tests <br /> suggested the possibility of leakage. As a result of the failed �'­.erfo.med on the <br /> w i western tank, soil samples were obtained from the vicinity of the .r:; =:•,- .;:i i, middle tank to <br /> determine whether soil contamination had resulted. The soil sallfr...; " the presence of <br /> pctroleum hydrocarbon contamination in the soil to a do-^�` irately 28 feet. <br /> CcasequentIy, the western and middle tanks were removed in Apri : .:«'' "ii'.e et;ntartiinated soil <br /> beneath them excavated,: Both excavations were then backfilled with ,,; `Y~1,,brserock and paved <br /> over with asphaltic concrete. <br /> Anheuser-Busch retainiA Environmental Sciences rand Engineering (ESE) to investigan whether <br /> groundwater had been imparted by the petroleum hydrocarbon contamination produced by the <br /> leaking tanks. LSE proceeded with their investigation in two phases. The .first phase was <br /> r conducted in My 1937 and involved the installation of one monitoring well in the immediate <br /> j vicinity of the removed tanks. The second phase was conducted in September 1987 ane! involved <br /> the installation of two additioi)aI monitoring wells. Du,ng the construction of each well, soil <br /> sampies were obtained at 5 fee[ vertical intervals and the subsurface soil conditions wcrG recorded. <br /> !r A copy of the preliminary ESE report is included as Appendix 1. ' <br /> ,Soil and'groundwater samples retrieved by ESE were analyzed for the prezence of petroleum <br /> hydrocarbons by an analytical laboratory. Scil samples obtained during,.thr. installation of <br /> monitoring well I (MW-2) hud no deteaable quantities of contamination with tree. exception of the <br /> soil sample obtained at a depth of 55 feet, which exhibited detectable levAs of total petroleum <br /> I hydrocarbons (TPH) and aromatic volatile organics (AVQ's). Groundwater samples obtained after <br /> completion of MW-I, upon laboratory analyses, wzre noted to contain :;retectable levels of TPH, <br /> 1 Soil samples obtain-A during the installation of monitoring wells 2 ani:'3 (MW-2 and MW-3) had <br /> no detectable quaistities of contamination with the enceptinn of deteriaale levels of TPH, at a depth <br /> ANDERSON <br /> r CONSULTING <br /> GROUP <br /> 7 <br />