Laserfiche WebLink
! • <br /> A M B R A Mr Michael Infurna <br /> April 6, 2005 <br /> Deeper Zones Investigation <br /> As approved in SJCEHD's June 14, 2004 letter, Shell will proceed with installing proposed well <br /> S-7 and groundwater monitoring per Cambria's April 30, 2004 Response Letter/Site Investigation <br /> Work Plan As requested in that letter, if petroleum constituents are present at concentrations <br /> above MCLS after four quarters of monitoring, Shell will submit a work plan for deeper-screened <br /> monitoring wells within 30 days Yu ' <br /> t, , <br /> SITE INVESTIGATION WORK PLAN ADDENDUM! <br /> Permit Cambria will obtain an appropriate drilling permit from SJCEHD <br /> Site Safety Plan Cambria will prepare a site safety plan for field work <br /> Utility Clearance Cambria will irizark proposed drilling location, and the location will be cleared <br /> through Underground Service Alert prior to drilling <br /> Site Investigation One exploratory soil boring (SB-6) is proposed at the location shown on <br /> Figure 2 The exploratory boring will be drilled using hollow-stem auger equipment Boring SB-6 <br /> will be located downgradient of the former waste oil UST <br /> A Cambria geologist will supervise the drilling and describe encountered soils using the Uriified <br /> Soil Classification System and Munsell Soil Color Charts Cambria will collect soil samples from <br /> the borings at 5-foot intervals for soil description and organic vapor screening with a photo- <br /> ionization detector (PID) Cambria will prepare an exploratory boring log for the boring and <br /> record PID measurements on the boring log Cambria will use a bailer to collect grab groundwater <br /> samples from the boring at first encountered groundwater and will retain the samples in vials <br /> containing hydrochloric acid preservative with no headspace Groundwater samples will be <br /> labeled, entered onto a chain-of-custody record, and placed into a cooler with ice for transport to a <br /> State of California certified laboratory for analyses No soil samples will be retained for chemical <br /> analyses as this area has been adequately characterized by previous soil borings <br /> Chemical Analyses Groundwater samples from the boring will be analyzed for dissolved metals <br /> (cadiruum, chromium, lead, iuckel, and zinc) by EPA Method 6010B, for PCBs by EPA Method <br /> 8082, and for naphthalene and creosote by EPA Method 8270C <br /> . Report Preparation Following receipt of laboratory analytical results, Cambria will prepare a <br /> written report which will include field procedures, analytical results, a boring log, and conclusions <br /> 6 <br />