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Roberts Petroleum Service Facility <br />Project No. 1628G <br />September 7, 1989 <br />Page 1 <br />JULY QUARTERLY <br />GROUNDWATER SAMPLING AND ANALYSIS <br />AT <br />ROBERTS PETROLEUM SERVICES FACILITY <br />930 VICTOR ROAD <br />LODI, CALIFORNIA <br />INTRODUCTION <br />Ensco Environmental Services, Inc. (EES) has completed the July quarterly sampling <br />to ascertain the groundwater conditions beneath the Roberts Petroleum Services <br />facility located at 930 Victor Road in the City of Lodi, San Joaquin County, California <br />(Figure 1). Six of the seven groundwater monitoring wells at the site were sampled on <br />July 18, 1989 as part of the quarterly sampling program that was recently initiated at <br />the request of Roberts Petroleum Services. Well MW -1, adjacent to the transfer block, <br />remains dry. The program objectives are as follows: <br />• Plot the groundwater contour surface within the site boundaries. <br />• Investigate for the presence of a petroleum hydrocarbon plume and <br />determine concentrations. <br />• Compare current and past data. <br />The existence and degree of hydrocarbon contamination is determined by (1) <br />checking for the presence of free-floating product and (2) performing laboratory <br />analyses of groundwater samples to determine concentrations of total petroleum <br />hydrocarbons as diesel (TPHD); total petroleum hydrocarbons as gasoline (TPHG); <br />benzene, toluene, ethyl benzene, and total xylenes (BTEX); and tetra ethyl lead (TEL). <br />