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I , 0 ! Ile 17 March 1996 AGE-NC Project No 95-0128 ' Page 2 of 8 ' 2 2 INSTALLATION OF GROUND WATER MONITORING WELLS 2 2 1 DRILLING AND SAMPLING On 28 and 29 of January 1997, soil borings B7 through B 1 i were advanced at the site Boring locations are illustrated on Figure 2 Soil borings 137, B8, B9 and B 11 were advanced to a depth of ' 50 feet below surface grade (bsg) and soil boring B 10 was advanced to a depth of 45 feet bsg Drilling was performed using a truck-mounted CME 75-HT drill lig equipped with continuous flight, eight-inch, hollow-stens augers The drill rig and two-man crew were supplied by Mitchell Drilling Environmental (MDE) of Rancho Cordova, California ' Samples were collected at five foot intervals in all borings except boring B10, using a split tube sampler loaded with three clean, 2- by 6-inch brass sleeves A 140-pound hammer was used to ' advance the samples 18 inches, the number of blows required to advance the sampler in 6-inch increments was recorded on the boiing logs Boring 1310 was continuously sampled using a split tube, three inch dialneter core sampler The sampler was advance with the progiession of the boring and soil sample were collected with a clean, 2- by 6-inch brass sleeves All sampling equipment xNas washed in an Alconox solution and rinsed twice with water prior to each sampling run ' Soil samples wete preserved by covering both ends of the brass sleeve with Teflon sheets, capping and sealing with tape Samples were stored in a chilled container and transported under chain-of- custody hain-ofcustody to MLCampbell Analytical, Inc (MAI) in Pacheco, California Selected samples were ' analyzed for total petroleum Hydrocarbons quantified as gasoline and diesel (TPH-g and 1PH-d) and for volatile aromatics(benzene,toluene, ethyl benzene and xylenes BTE&X) with methyl-tert-butyl ether (M rBE) in accoidanc,e with EPA methods 5030/8015m and 8020, iespectively Three soil samples from differing lithologic units observed at the site w ere ubinitted for geotechnical analysis Samples were transported to Copper Testing Laboratory (CTL) of Mountain View, California, and analyzed for organic content, porosity and permeability in accordance with ASTM Methods D2974 and D5084, respectively One Svii Su,�ipIC "vvaS trFuisport4u to 011 tlidCt}Clldelnt 1nn1L1oUlUlu lst MI A iLCiLll Kdulmwan of Culver City, California, and analyzed for physicochenucal properties and microbiological enumeration Data obtained from the microbiological and physicochemical analysis will be used to determine possible effectiveness of bio remediation as a remediation alternative During drilling, auger returns were monitored for the presence of organic vapors (OVs) using a photo-ionization detector (PIU Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene) Auger returns were stored on-site on DOT H-17 storage drums pending laboratory analysis and disposal at a licenced facility