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• = - _..-- - mom' r` ^- . ems- — _ ., <br /> 104 IRR <br /> MW <br /> wa; ,pa+1,wMl OWN& <br /> � �£'°'Si�Y ��, ��- �� } 1PAt'�. r _,;.,�.. ,g. _ � 1'� � ;-'A7� •} v _ �, <br /> f� Chevron/W. Benjamin Holt Drive 5 <br /> .lune 2990 <br /> Based on the data generated so far from this site, <br /> Groundwater Technology, Inc, recommends that twc additional <br /> groundwater monitoring wells be installed on site. The details <br /> Of the proposed well installation are presented in the next <br /> section, <br /> WORK STEPS <br /> SOIL BORINGS <br /> 1 <br /> ' Groundwater Technology proposes to install two additional <br /> groundwater monitoring hells at this site. Figure 4 indicates <br /> the proposed locations oz the borings for the groundwater <br /> monitoring wells. one soil boring will be drilled on site, west <br /> of monitoring well MW-5. The other will be drilled, if <br /> encroachment permits can be obtained and an appropriate well <br /> ' location can be found, off site to the east across Plymouth Road. <br /> These locations have been selected to determine if dissolved <br /> € gasoline hydrocarbons extend off site to the west and/or east. <br /> The soil borings will be drilled using a truck-nounted drill <br /> rig equipped with 8-1/2-inch outside diameter (O.D.) , hollow sten, <br /> augers. During drilling; a Groundwater Technology field <br /> geologist will maintain a continuous 'l.og of the sous as. they are <br /> encountered. This log will include periodic measurements of <br /> organic-vapor concentrations as indicated by field readings taken <br /> with a photo-ionization, detector (PID) . The field geologist will <br /> also collect samples from the continuous core for possible <br /> laboratory analyses. Such samples will be collected in clean, <br /> 2--inch-diameter brass tubes. The tubes will be sealed with <br /> aluminum foil, capped, and the caps secured with plastic tape to <br /> produce an air-tight seal. The samples will be labeled and <br /> placed on .ice in an insulated cooler for transportation.to GTEL <br /> Environmental Laboratories, . Inc. (GTEL) in Concord, California <br /> under Chain-of-Custody Manifest. _ <br /> GROUNDWATER <br /> __�� TECHNOLOGY;INC, <br />