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\.1 .. / k'q KLEINFELDER <br /> Task E03 - Permitting and Pre-Field Activities <br /> Based on the verbal approval of the client,this scope of work will be finalized and will be submitted <br /> to the San Joaquin County Public Health Services Department Environmental Health Division <br /> (PHS/EHD) for approval. Kleinfelder will obtain boring/well permits from the San Joaquin County <br /> Public Health Services Department Environmental Health Division (PHS/EHD). PHS/EHD must <br /> approve the proposed scope of work and the boring permits prior to any exploraTvry borings greater <br /> than 18 inches in depth. <br /> It will be the responsibility of the Geoprobe subcontractor to contact Underground Service Alert <br /> 48 hours prior to conducting fieldwork to notify local utilities of our proposed subsurface <br /> assessment. Please be aware private utilities may exist at the site which USA may not identify. <br /> Task E04—Geoprobe Soil and Groundwater Assessment <br /> Kleinfelder proposes collecting soil and groundwater samples from--a minimum of three <br /> Geoprobe borings and up to seven Geoprobe borings. The borings will be advanced north- <br /> northwest of the former UST near Industrial Drive. The actual sampling locations will be <br /> dependent on access, surface conditions, and potential interference with subsurface utilities. The <br /> three probe locations will be placed in a semi-circle in the northwest portion of the contaminant <br /> plume in an attempt to define the extent in this direction (Plate 1). Because of the nature of the <br /> Geoprobe technique, the possibility exists that probe refusal may occur. Samples may not be <br /> collected if hardpan soil, gravel, or bedrock is encountered. <br /> The Geoprobes will be advanced to an approximate total depth ranging from 30 to 35 feet below <br /> surface grade (bsg), which is approximately 5 feet below first encountered groundwater. The <br /> Geoprobes will be advanced using a pneumatically driven steel probe. Soil samples will be <br /> obtained by inserting a sample barrel, lined with acetate liners, into the probe. The sample barrel <br /> will be lowered to the desired sampling depth and driven into the soil. The sample tubes will be <br /> removed and sealed with Teflon and plastic caps. <br /> During the advancement of the borings, soil samples will be collected at five foot intervals for <br /> lithologic classification and qualitative field screening, with an organic vapor analyzer (OVA) <br /> The OVA measures ionizable compounds in air in parts per million by volume (ppmv). <br /> Lithologic classification will be based on the Unified Soil Classification System (USCS). Soil <br /> samples will be obtained in the vadose zone, based on field observations, for potential <br /> quantitative chemical analysis. At this time, we propose to analyze a total of 3 soil samples, one <br /> from each boring. Time permitting, additional Geoprobe borings may be advanced and <br /> additional samples collected for analysis. <br /> Groundwater samples will be obtained by using a decontaminated stainless steel bailer or <br /> peristaltic pump with new tubing, depending upon field conditions. If turbid groundwater <br /> conditions are encountered, a disposable screened PVC casing or decontaminated stainless steel <br /> wrapped casing screen may be placed within the Geoprobe holes to filter out sediment, as <br /> necessary. <br /> 20-4439-01.1301/2000R311 Page 3 of 6 <br /> Copyright 2000 Kleinfelder,Inc. April 25,2000 <br />