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1.4 INTRODUCTION <br /> USA Petroleum Corporation (USA) has retained Park Environmental Corporation (Park) to <br /> represent USA in matters pertaining to environmental issues at its facility located at 21.32 <br /> Mariposa Road, in Stockton, California (Figure 1) Mr Charles Nichols of USA has authorized <br /> Park to prepare this workplan for off-site assessment of soil and groundwater at the subject site <br /> ' San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) in their <br /> letter dated January 4, 1993 has requested a survey of nearby water wells be performed and that <br /> additional soil bonngs/monitoring wells be installed as needed until the extent of the soil and <br /> ' groundwater contaminant plumes have been characterized In addition, the PHS/EHD has <br /> requested monitoring wells be installed in each down gradient flow direction identified for this <br /> site <br /> Total Petroleum Hydrocarbon (TPH) compounds previously detected in groundwater have been <br /> reported as gasoline The sources of this TPH product has not been identified There is a need <br /> ' to install additional monitoring wells as requested by PHS/EHD and continue the quarterly <br /> groundwater monitoring program <br /> ' 1.1 Purpose <br /> The purpose of the investigation is to evaluate the source(s) of the TPH release(s) Tasks <br /> described in this workplan include the following <br /> • Identify nearby groundwater wells, <br /> ' • Install 3roundwater monitoring wells off-site, <br /> g g <br /> ' • Collect and analyze soil samples from off-site monitoring wells, <br /> ' • Evaluate potential sources of on-site or off-site releases, <br /> • Assess the groundwater flow direction and hydraulic gradient, <br /> ' • Collect and analyze water samples as part of the quarterly <br /> groundwater monitoring program, and <br /> ' • Develop a remedial strategy <br /> ' 1.2 Scope of Work <br /> The scope of work to be performed by Park includes the following <br /> ' • Obtain all required permits for the drilling and installation of <br /> A 112512 wP 1 <br />