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Phase II Workplan • • <br /> CLIENT-Stockton,CA <br /> ATC Project No.75.25729.0002 <br /> Page 2, May 16,2001 <br /> SCOPE OF WORK <br /> Project Objective: The primary objectives of this site investigation will be to assess the potential presence <br /> of petrolcum hydrocarbons, solvents and/or pesticides in the shallow soil on site. <br /> This Workplan addresses the tasks involved in successfully implementing the site investigation. These key <br /> tasks include: Health and Safety, Field Sampling and Analysis, Data Analysis, and Reporting. Each key <br /> task is described below. <br /> Health and Safety <br /> A site-specific hazard assessment was performed during a reconnaissance of the site. Based on this hazard <br /> assessment, a site specific HASP has been prepared to mitigate or reduce both physical and chemical <br /> hazards. A copy of this HASP is attached to this workplan. <br /> Field Sampling and Analysis <br /> An ATC geologist will mark the locations of the proposed boreholes, and contact Underground Service Alert <br /> (USA) who will provide clearance that no public underground utilities will be disturbed. The Site owner or <br /> representative will also be required to approve the proposed locations and to accurately mark any private utilities <br /> on site. <br /> The proposed field investigation will involve collecting soil samples from the vicinity of two leach field <br /> areas. The following sampling and analysis plan has been developed. Groundwater is not expected to be <br /> encountered during the course of this investigation. <br /> Soil Sampling: Ten borings are planned for this area. Locations of the borings are shown in Figure 2. All <br /> 10 soil boreholes (B 1 through B 10) will be drilled to depths ranging from 5 to 10 feet bgs with a Geoprobe <br /> direct push drilling device. Soil samples will generally be collected at 5-foot intervals (beginning at a depth <br /> of approximately 5 feet bgs) from each boring or where changes in soil lithology are observed. <br /> The borings will be advanced using Geoprobe direct push technology, and logged by an ATC geologist <br /> under the supervision of a California registered geologist. Drilling equipment will be decontaminated <br /> between borings. Following completion of borings and/or collection of groundwater grab samples, soil <br /> borings will be backfilled using a Portland Type II cement/bentonite grout. <br /> Soil samples will be field screened using an organic vapor meter equipped with a pbotoionization detector <br /> (OVA-PID). The OVA will be calibrated in the field in conformance with the manufacturer's <br /> specifications. <br /> Investigation Derived Waste (IDW) Management - Soil cuttings and decontamination fluids will be <br /> contained in Department of Transportation (DOT)-approved drums. Groundwater will also be contained in <br /> DOT-approved drums. The IDW will be stored at an on-site location determined by site personnel. The <br /> drums will be labeled with a description of contents and accumulation start date. <br /> Sample Analysis— Soil samples will be analyzed for: <br />