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' 1.0 INTRODUCTION USA Petroleum Corporation (USA) has retained Part. Environmental Corporation (Park) to represent USA in matters pertaining to environmental issues at its facility located at 2132 Mariposa Road, Stockton, California, as shown on Figure 1 USA has authonzed Park to ' prepare this workplan for groundwater momtonng well installation at the subject site San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) in their ' letter dated January 4, 1994 has requested that additional soil borings/monitoring wells be installed as needed until the extent of the soil and groundwater contaminant plumes have been 1 characterized In addition, the PHS/EHD has requested monitoring wells be installed in the downgradient flow direction identified for this site ' Total petroleum hydrocarbon (TPH) compounds previously detected in groundwater have been reported as gasoline The source(s) of this TPH product has not been identified There is a need to install additional monitoring wells as requested by PHSIEHD and continue the quarterly ' groundwater monitoring program 11 Purpose ' The purpose of the investigation is to evaluate the source(s) of the TPH release(s) Tasks described in this workplan include the following • Install three groundwater monitoring wells off-site, ' 0 Collect and analyze soil samples during oil-site monitoring well construction, • Assess the groundwater flow direction and hydraulic gradient, and ' 0 Collect and analyze water samples as part of the quarterly groundwater ' monitoring program 12 Scope of Work ' The scope of work to be performed by Park includes the following ' Obtain all required permits for the drilling and installation of groundwater monitoring wells, ' Drill and install three groundwater monitoring wells to depths of approximately 85-feet below the ground surface (bgs) It is anticipated that first groundwater is at approximately 75-feet bgs,