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PROBLEM ASSESSMENT REPORT <br /> 1399 E. YOSEMITE AVENUE <br /> MANTECA, CALIFORNIA <br /> NGA PROJECT NO. 10-90-480 <br /> 1.0 INTRODUCTION <br /> 1.1 Authorization and Purpose <br /> Nations Groundwater Associates (NGA) has been authorized by Moore <br /> Petroleum, Inc. to prepare this problem assessment report of Moore <br /> Petroleum's gasoline service station located at 1399 E. Yosemite <br /> Aven.e, Manteca, California, (T.15, R.7E. , Section 34 MDB&M) <br /> (Figure 1) . <br /> The purpose of this report is to present details of the abandonment <br /> and replacement of monitoring well ,4W-1, evaluate the extent of <br /> petroleum constituents in soil and ground water, and provide <br /> recommendations for remediation plans (if required) for soil and <br /> ground water at the site. <br /> 1.2 Scope of Work <br /> The scope of work for this report includes the following <br /> activities: <br /> o Review of available geologic and hydrogeologic data <br /> pertinent to the site. <br /> • Abandonment and replacement of monitoring well XW-1, and <br /> development of the new well., MW-1A. <br /> • During the drilling of MW-1A, undisturbed soil samples <br /> were collected within the vadose zone at 5-foot-depth <br /> intervals, by means of a California-modified split-spoon <br /> sampler. These soil samples were submitted to a <br /> California-certified laboratory to be analyzed for <br /> benzene, toluene, ethylben?ene, xylenes (BTEX) ; 1,2- <br /> dichloroethane (EDC) ; ethylene dibromide (EDB) ; and Total <br /> Petroleum Hydrocarbons (TPH) by EPA method 8260. <br /> s Soils encountered in the drilling of MW-1A were <br /> classified according to the Unified Soil Classification <br /> System. <br /> Sampling of native soils beneath Underground Storage <br /> Tanks (USTs) and installation of the below-ground <br /> components of a soil venting system within the tank <br /> basin. <br /> .i <br />