WORK PLANS_FILE 2 - Laserfiche WebLink

Home Browse Search

Site Assessment Work Plan -1022 Frontage Road,Ripon, California CONESTO -A-ROVERS March 7, 2008 &ASSOCIATES - 5.1 Pre-Field Activities Prior to initiating field activities CRA will conduct the following tasks: 5.1.1 'Site Health and Safety Plan A site-specific health and safety plan will be prepared to educate site workers and minimize their exposure to potential hazards related to site activities. " 5.1.2 Permits A soil boring permit will be obtained.from SJCEHD. 5.1:3 Utility Clearance The proposed drilling locations will be pre-marked with white paint and Underground Service Alert(USA) will'be notified of the"drilling'and sampling activities at least 72 hours before work begins. A private utility locator will also be retained to clear the proposed drilling locations of any unmarked utilities.-To avoid hitting any subsurface utilities,the first eight feet of each soil borings will be advanced using a hang auger and thereafter using a direct push Geoprobe 5.2,, Soil and Groundwater Sampling Using=Geoprobe® Each Geoprobe boring will be advanced to a depth of approximately 30.ft bgs,or deeper if necessary,to vertically delineate petroleum hydrocarbons in.Soil.- Previously collected soil data demonstrates that the majority of±petroleum hydrocarbon impact is detected above 25 ft bgs fTabl&A). During drilling, . undisturbed,soil samples will be continuously collected approximately every five feet,using a four-ft barrel - sampler lined with.acetate sleeves. Soil will be visually examined and classified in a general accordance with Unified Soil Classification System.(USCS). Field screening of hydrocarbons will include visual = and/or olfactory observations,and photoionization detector(PID)readings.Pertinent information including soil lithology,PID readings, and sample depths will be recorded on a soil boring log.Grab groundwater samples will be collected from the open borehole using a new disposal bailer. Once a groundwater sample has been collected,the soil boring will be tremie grouted from the bottom up using cement grout.CRA's standard field procedures for Geoprobe sampling are presented as Attachment C. ' 5.3'' Soil Boring Survey Upon completing the drilling activities,CRA will retain the services of licensed surveyor to survey the coordinates•and elevations of the soil boring. -Survey data`will:be tied to a local benchmark:. Worldwide Engineering,Environmental,Construction,and IT Services -