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' Revised Soil and Groundwater Investigation Work Plan <br /> Mountain House Development Site#6 July 2007 <br /> ' Soils encountered in the borings were predominantly clays, silts, and sands. Borings advanced on the <br /> shoulder of Byron Road encountered clay and gravel fill in the upper 1 to 3 feet that appeared to be road <br /> sub-base. Groundwater was observed at the site at depths ranging from 7 to 17 feet bgs. <br /> ' 3. SCOPE OF WORK <br /> SAIC will implement the scope of work described in sections 3.1 through 3.5. In general, SAIC will <br /> ' advance up to 27"primary"and four"contingency"borings from which soil and groundwater samples <br /> will be collected for laboratory analysis,to delineate the extent of affected soil and groundwater. SAIC <br /> will also collect and have analyzed shallow soil samples for a risk assessment. <br /> ' 3.1 PERMITTING,ACCESS,AND SITE SAFETY <br /> Before initiating the field investigation, SAIC will perform the following: <br /> ' • Determine the ownership of and obtain access to private properties coincident with the scope of <br /> work described herein. <br /> ' • Obtain boring permits from the San Joaquin County Environmental Health Department <br /> (SJCEHD). <br /> • Obtain an encroachment permit from the Mountain House Community Services District <br /> t (MHCSD)for borings located in the Byron Road ROW. <br /> • Obtain an approved traffic-control plan from the MHCSD. <br /> ' • Prepare a site-specific Health and Safety Plan. <br /> • Prepare a site-specific Journey Management Plan. <br /> t • Conduct a site visit to mark boring locations for Underground Service Alert,which will locate <br /> underground facilities in adjacent public ROW. <br /> • Subcontract Cruz Brothers Locators,a private utility locator,to identify any potential overhead <br /> ' and underground hazards. <br /> 3.2 DWR FILE REVIEW <br /> ' In order to assess the extent of affected soil and groundwater and potential impacts to receptors, SAIC <br /> will review DWR files to identify any water wells within 2,000 feet of the site. <br /> 3.3 FIELD INVESTIGATION ACTIVITIES <br /> ' SAIC will contract a Califomia-licensed(C-57)driller to operate truck-mounted,GeoProbe direct-push <br /> equipment to advance up to 27 primary borings(Figure 3; note,the lettering system A through AA used <br /> below will be converted in the field to a consecutive numbering): <br /> ' • SB-A, SB-B, SB-C,and SB-D to investigate the extent of affected media around GP 152. <br /> • SB-E to investigate the source,magnitude,and extent of affected media at GP152. <br /> ' • SB-F, SB-G, and SB-H to investigate the extent of affected media around GP156. <br /> • SB-I to investigate the source, magnitude, and extent of affected media at GP 156. <br /> ' • SB-J to investigate the extent of affected media up gradient of GP157 and GP158. <br /> • SB-K to investigate the extent of affected media immediately down gradient of GP 157. <br /> ' • SB-L to investigate the extent of affected media immediately down gradient of GP158. <br /> • SB-M to investigate the extent of affected media immediately down gradient of GP 160. <br /> 1 3 _ == <br /> ' From Science to Solutions <br />