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Mr Edward C Ralston . Unocal Corporation December 5, 1996 Page 2 Soil Sample Analytical Results Selected soil samples collected between 10 and 25 feet bsg from each of the borings were submitted to Sequoia Analytical laboratory (a California-certified laboratory) for analysis of benzene, toluene, ethylbenzene, total xylenes (BTEX), and methyl tertiary butyl ether (MTBE) using EPA Method 8020, total purgeable petroleum hydrocarbons (TPPH) as gasoline, and total extractable petroleum hydrocarbons (TEPH) as diesel using EPA Method 8015 Modified Laboratory analytical results reported that the samples analyzed from the borings of monitoring wells MW-1 through MW-3 were below the laboratory's limits of detection for BTEX, TPPH as gasoline, and TEPH as diesel Concentrations of MTBE above the laboratory's limits of detection ranged from 0 12 milligrams per kilogram (mg/kg) to 12 mg/kg Soil sample analytical results are summarized in Table 1 and a copy of the laboratory analytical report with chain of custody documentation is included in Enclosure D Soil samples representative of each soil lithology(sandy silt and clayey silt) identified at the site were submitted to PTS Laboratories Inc of Santa Fe Springs for analysis of moisture content, effective porosity, permeability, grain size, soil pH, and bulk and gram density Soil samples collected from boring B-1 at 6 0 and 110 feet bsg were submitted for analysis of total organic carbon, for background measurements Results of these analyses are presented in Enclosure E Stockpile Soil Samples Soil cuttings generated during the dnllimg of the four soil borings were stored on-site on plastic and covered with plastic at the end of the day Four soil samples were collected from the stockpiled soil and submitted to the laboratory for compositing and chemical analyses Results of the analyses were used for profiling the soil for disposal The analytical results are presented in Table 1 and a copy of the Iaboratory analytical report with chain of custody documentation is included in Enclosure D Following receipt of the analytical results, the soil was profiled for disposal at Forward Inc (Forward) of Stockton, California The soil was profiled under Forward's profile number 7041 A copy of the waste profile form is presented in Enclosure F On September 13, 1996, Forward approved the soil for disposal and Manley and Sons Trucking, Inc of Sacramento, transported approximately one yard of soil from the site to Forward's disposal facility Well Installation Three soil borings were completed as two-inch diameter monitoring wells (MW-1 through MW-3) utilizing, schedule 40 PVC flush threaded casing material The screened interval m each well is constructed of 0 020-inch slotted casing extending from five to 25 feet bsg The annular space in each well was filled with Lonestar No 3 sand (filter-pack) to one foot above the top of the screened interval A one foot thick bentonite seal was placed over the filter-pack, with the remaining annulus being filled with neat cement Each monitoring well was completed at the surface with a flush grade traffic rated well box set in concrete Monitoring well construction details are presented in Enclosure G i