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E <br /> Ertl <br /> tib <br /> WORK PLAN <br /> SOIL GAS SURVEY <br /> Holt Brothers Tractor Company <br /> `� Stockton Cal fo . {a <br /> i <br /> c <br /> 3 <br /> 1.0 INTRODUCTION <br /> j I.1 PURPOSE <br /> This Work Plan presents the scope of work for a sof] <br /> r Holt Brothers Tractor Company facilit gas survey at the <br /> Stockton, California. The PurY located at 1521. West Charter Way, <br /> Purpose a to further investigate <br /> this study is <br /> the extent of the hydrocarbon Flume in sail <br /> site. The soil gground water below the <br /> as and <br /> survey will be followed b <br /> E Investigation which will incl Y the Phase . II site <br /> monitoring wells at locations based nethe nresuitsiof the soilon of gas asr-irve and <br /> " I•'L BACKGROUND g Y <br /> The Holt Brothers Tractor Company is .a farm equipment dealership <br /> located in Stockton, California (Figure I). Activities <br /> �. Facility include the maintenance and repair OF nductad at this . <br /> underground storage tanks (i1STs) used forlg storing h dratteq ip_ment. Sr.,ven.hydvaulic <br /> solvents, oils, waste oil. gasoline and diesel <br /> fuel were also includea <br /> within this facility. <br /> 1'tk <br /> The Halt Brother site <br /> province. This is located iit the Great Valley Geomorphic <br /> province <br /> 5i�rra Nevada and the Coast is <br /> of the elongate lowland between the <br /> �.F Ranges, and extends from Redding to Bakersfield, <br /> Califoraia. Stockton, California I.ies approximate <br /> � i Great Valley. Geologically, this 1} in the center o£ this <br /> alluvial, flood and delta plain de ,pftsxnce is represented by primarily <br /> �a area, the Sthe <br /> acrame�tto River and the an Joaquin fromRivertwo major rivers in the ` <br /> ti <br /> T:;e soils underlying Holt Brothers Tractor Company are comprised mainly . <br /> of into.-bedded and fnter£ingering clay, silt <br /> is consistent with flood basin type s, and fine grain sands. This <br /> E ; lying areas adjacent to ma or streamae and,t5 whichverr aredepositor' in tow- <br /> ruin Infiltration and permeability rates tend to be Icw due to the small <br /> keduring periods of high <br /> train sizes of the interfingered clays and silts. <br /> Elevated concentrations oftotal <br /> Petroleum hydrocarbons in soil at the <br /> site was first noted in May, 1988, when the seven uuderground storage tanks <br /> were removed from the ground. During excavation of the tanks, evidence of <br /> ? leakage from the ranks, inel"ding <br /> 5cil <br /> reportedly observed. Althoughstaining by hydrocarbons, was <br /> from the seven tanks i not know nhhv,tDames & Mooreotal volume �tsoilrstainfng hadocarbons been <br /> E LDO1.022 <br /> E! 1 <br /> ra <br />