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6� ��'� ..yYn :,a ssw. �. f '`- ,"'�n.'� �x,a �W�a;+4 �,. r „Mr �� '.. � 2ry �.a"�„��''' "S �.�' s k '•r.' w;:�'.-ct�r L.�'' '�.5 <br /> i Y' $ ;_R. '� Fb v�'Sa',^'• # y�� .�c,7 �f �� J r' Y'F P SS'a, ��Y <br /> Chevron/W. Benjamin Holt Drive 5 <br /> June 1990 <br /> Based on the data generated so far from this site, <br /> Croundwater Technology, Inc. recommends that two additional <br /> groundwater monitoring wells be installed on site. The details <br /> -A of the proposed well installation are presented in the next <br /> section. <br /> WORK STEPS <br /> 4 SOIL BOXINGS <br /> " Groundwater Technology proposes to install two additional <br /> gr-)undwater monitoring wells at this site. Figure 4 indicates <br /> the proposed locations of 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 /> l.cation 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-mounted drill <br /> .� rig equipped with 8-1/2-inch outside diameter (O.D.) , hollow stem <br /> 1` augers. During drilling, a Groundwater Technology field <br /> geologist will maintain a continuous log of the soils 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, Inca (GTEL) in Concord, California <br /> under Chain-of-Custody manifest. FG <br /> ROUNDWATER <br /> T£CHN01 off,INC. <br />