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CLEARWATER <br /> C R O U [' 1 \i C <br /> F II il Ull iNf lit it $t ii ilfS <br /> 2.0 SCOPE OF WORK <br /> 2.1 Purpose <br />' In accordance with the EHD letter dated April 30, 1996, this workplan <br /> proposes a subsurface investigation to assess the presence of petroleum <br /> hydrocarbons that may have been released from USTs formerly located at the <br />' site Three monitoring wells will be installed, and soil and groundwater <br /> samples will be chemically analyzed for fuel constituents Prior to <br /> implementation of this workplan, a Site-specific Health and Safety Plan must <br />' be submitted to the EHD for approval <br />' 2.2 Installation of Monitoring Wells <br /> Three 8-inch-diameter soil borings will be drilled and converted to 2-inch- <br /> diameter monitoring wells in the locations shown on Figure 2 Because the <br /> direction of groundwater flow at the site is unknown, the proposed <br /> monitoring wells are placed in locations that will allow calculation of the <br /> groundwater gradient on the basis of water levels measured in the three <br /> wells <br /> Drilling Specifications <br /> Prior to installing the monitoring wells, permits must be obtained from the <br /> San Joaquin County PHS by a California C-57 licensed driller Drilling will be <br /> conducted using a truck-mounted hollow-stem auger rig equipped with fl- <br /> inch-diameter augers Down-hole drilling and sampling equipment will be <br />' steam-cleaned prior to arriving onsite and between drilling at each boring <br /> location All drilling and sampling methods will be consistent with ASTM <br /> Method D-1452-80 and local, state, and federal regulations <br /> Soil Sampling <br /> Discrete soil samples will be collected at five-foot intervals or at stratigraphic <br /> changes The soil samples will be obtained by advancing a California- <br /> modified split spoon sampler lined with three 6-inch-long brass sampling <br /> tubes The sampler will be driven 18 inches past the lead auger by a dropping <br /> a 140-pound hammer from a height of approximately 30 inches The number <br /> of blows necessary to drive the sampler and the amount of soil recovered will <br /> i <br /> I <br /> C-178 WP 4197 3 <br />