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City of Everett Point Industrial Center (EPIC) Bridge Project – Phase 2 Full Design <br />Page 8 of 43 <br />Generate Geotechnical Work Plan Memorandum: HWA will prepare a Geotechnical <br />Work Plan Memorandum describing exploration means and methods. This work plan will <br />be submitted to the design team and the AGENCY for review and approval. The work <br />plan will detail the type, location, and extent of proposed field explorations along with <br />logistics necessary to perform the work such as traffic control plans and designation of <br />staging areas. The work plan will also be used for utility locating clearances and for <br />permitting and right of entries that may be necessary to access the exploration locations. <br />HWA assumes the AGENCY or CONSULTANT, in support of this Project, will acquire <br />and provide any required permits or right of entry at no cost to HWA. <br />Conduct Supplementary Explorations (CPTs): HWA will conduct a series of up to five <br />(5) CPT explorations along the Project alignment. One CPT will be pushed to a depth of <br />approximately fifty (50) feet near the location of expected retaining walls beyond the <br />western bridge abutment. Three (3) CPTs will be pushed to a depth of approximately one <br />hundred twenty-five (125) feet in the vicinity of the interior bridge piers. One CPT will <br />be pushed to a depth of approximately fifty (50) feet in the vicinity of the proposed <br />roundabout near the eastern end of the Project. HWA expects that these five (5) CPTs will <br />require three (3) days to complete. HWA assumes that traffic control including flaggers <br />will be required for two (2) out of the three days. <br />Conduct Supplementary Environmental Explorations: HWA will subcontract a <br />licensed driller to advance up to 5 borings to depths of up to 20 feet with a truck-/trailer- <br />mounted direct push drill rig. <br />a)For each boring, soil samples will be screened with a photoionization detector (PID), <br />water sheen test, and visual/olfactory methods (i.e., adverse odors, discoloration, <br />etc.). Soil samples with the highest level of organic vapors and/or most discernible <br />visual/olfactory contamination will be selected for chemical analysis. If groundwater <br />is encountered, samples will be collected from boring locations via temporary PVC <br />wells. Prior to sampling, the temporary wells will be purged until they run clear or for <br />30 minutes of purging, whichever comes first. Soil and groundwater samples will be <br />collected following HWA and regulatory agency standard operating procedures. <br />b)Samples will be placed in a cooler with ice after they are collected, and HWA will <br />employ chain-of-custody procedures while storing and transporting the samples. <br />Environmental samples will be submitted to an Ecology-accredited, third-party <br />analytical laboratory (OnSite Environmental of Redmond, Washington). Field staff <br />will deliver samples to the analytical laboratory or arrange for their pickup by a <br />courier within 24 hours of sampling. HWA will select one soil sample and one <br />groundwater sample (if encountered) per boring (maximum of six soil samples and <br />six groundwater samples) for chemical laboratory analysis of the following: <br />i.Gasoline range organics via Ecology test method NWTPH-Gx <br />ii.Diesel and oil range organics via Ecology test method NWTPH-Dx <br />iii.Volatile organics (VOCs) via EPA test method EPA 8260D