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'�-�y �+•^.� ... ,,, .w .', �y�x ,r�i.�.,a-.., �.�_"zi - T'V� ��K;. '+,'A.��F•� -. a� -rr e"� �*'°""'� ..� �'�'��i:,�7 s"�� '� ' h`� .A- , <br /> Chevron/W. Benjamin Holt Drive S <br /> June 1990 <br /> a <br /> Based on the data generated so far from this site, <br /> Groundwater Technology, Inc. recommends that two 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 /> ! Groundwater Technology proposes to install two additional <br /> groundwater 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 /> T 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-mounted drill <br /> rig equipped with 8-1/2-inch outside diameter (O.D.) , hollow stem <br /> augers. During drilling, a Groundwater Technology field <br /> s 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 /> i <br /> with a photo-ionization detector (PID) . Tlie 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. T), tubes will be sealed with <br /> aluminum foil, capped, and the craps 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 /> ^��. CROUNDtiiATER <br /> i'ECHROLOGY.INC. <br />