Laserfiche WebLink
(MM PEA Work Plan <br /> Martin Metals Finishing Inc. (Former) <br /> Stockton, California <br /> 4 FIELD OPERATIONS <br /> Field work will be performed under the supervision of a California-registered professional geologist or civil <br /> engineer. <br /> 4.1 Pre-Field Activities <br /> Prior to conducting the field work, CDIM will visit the Site to mark the proposed boring locations and to <br /> review the Site conditions prior to drilling. CDIM will contract with an underground utility <br /> locating company to survey the proposed boring locations and to mark the location of any underground utilities <br /> relative to those locations. CDIM will notify Underground Service Alert North a minimum of three business days <br /> prior to commencing field activities. CDIM will also obtain a drilling permit if required from San Joaquin County <br /> Environmental Health Department (SJCEHD). <br /> 4.2 Field Sampling <br /> Figures 5 and 6 show proposed sample locations discussed below. <br /> 4.2.1 Storm Drain Condition Assessment <br /> To investigate the condition of the storm drain pipe between the former MMF and the Mormon Slough, <br /> CDIM will contract with a utility inspection company to perform a camera inspection of the storm drain from the <br /> trench to the outfall. The video footage will be reviewed in an attempt to determine whether areas or trench pipe <br /> separation or other deterioration exist. The subsurface sample locations may be adjusted based on the findings <br /> of the condition assessment. <br /> 4.2.2 Sampling Locations and Intervals <br /> This section outlines the planned sampling activities for the Site. Sample location rationale is outlined <br /> below (Figures 5 and 6). <br /> • MMF-TS-01 through MM-TS-03: assess concentrations of COPCs in sediment potentially <br /> accumulated in the storm drain trench inside and just north of the MMF building, if feasible. <br /> • MMF-VP-01 through MMF-VP-05: assess concentrations of COPCs in sub-slab soil vapor <br /> beneath the MMF building. <br /> • MMF-SS-01 through MMF-SS-05 and MMF-SV-01 through MMF-SV-05: assess concentrations <br /> of COPCs in subsurface soil beneath the MMF building and provide an additional line of evidence <br /> of soil vapor beneath the MMF building. <br /> CDIM—Fairgrounds Industrial Park Page 10 <br />