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` • Installed duee (3) soil borings to a depth of 25 feet on 20 and 21 March 1991. <br /> Four-inch monitoring wells were installed in each boring to monitor the free-water <br /> table in order to intersect light non-aqueous phase liquids(LNAPLs). <br /> • Collected soil samples from each soil boring at a minimum of five foot intervals <br /> throughout the unsaturated zone. One sample from each boring was submitted for <br /> Iraboratory analysis for total petroleum hydrocarbons (l'PH) by LPA Method <br /> 418.1. and for the fuel constituents benzene, toluene, ethyl benzene and xylene <br /> (BTEX)by EPA Method 8020. <br /> • Screened the soil headspace in the field with an organic vapor analyzer (OVA) to <br /> evaluate relative concentrations of organic vapors in the soil. Soil samples that <br /> were submitted for analysis were selected based on these OVA field readings. <br /> - Developed all three monitoring wells on 22 March 1991 by mechanical surging <br /> and bailing. <br /> • Sampled the monitoring wells on 25 March 1991 after following applicable <br /> sampling protocols. Samples from each well were analyzed for TPH by EPA <br /> Method 418.1 and BTEC by EPA Method 602. <br /> • Surveyed each monitoring well for exact elevation rasing the USGS Mean Seal <br /> Level(MSL)datum. <br /> • Measured water levels at well completion, before and after well development, and <br /> before and after water sampling. <br /> • Monitored each well for possible free-product(LNAPL) on top of the water table <br /> at the completion of each well. <br /> • Completed a sensitive receptor survey in accordance with Exxon guidance <br /> information and was subm ued as R separate document. <br /> • This report serves as a Final Report which summarizes field activities and <br /> investigation reports. In addition to the above scope of work, a detailed Workplan <br /> and a site-specific Health & Safety Plan for this site investigation was prepared as <br /> part'of permitting requirements for Public Health Services, San Joaquin County, <br /> 1-2 <br /> 175-07.at5 4124191 <br />