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I � <br /> Eli <br /> Site Assessment Report,Site Conceptual Model,and Site Investigation Work Plan <br /> R&L Diesel Services,2417 West Lane, Stockton, California, 95205 <br /> 4.0 PROPOSED SCOPE OF WORK <br /> s <br /> This description of the scope of work documents the advancement.of six soil-borings to further <br /> define the extent of petroleum hydrocarbon impacted soil"and groundwater north of the historical <br /> spill site (Figure 5). i <br /> t5 <br /> All work will be performed in accordance with County regulations, California Code of <br /> F, Regulations, Title 23, Section 2647 and 2648, and the California Department of Water <br /> Resources Bulletins 74-81 and 74-90. Drilling and well installation activities will be overseen by <br /> a California Professional Geologist. <br /> 4.1 Project Planning and Permitting 1 <br /> WRM will obtain the required boring and well installation permits from the San Joaquin County <br /> F <br /> EMD and work plan approval from the CVRWQCB. <br /> Underground Service Alert (USA) will be notified a minimum of 48 hours prior to the installation <br /> of the soil borings to locate any utilities in the vicinity of Ithe planned boring and well locations. <br /> As a further precaution against encountering underground utilities during drilling, the upper five <br /> feet of all borings will be hand augered. <br /> i <br /> Prior to initiating fieldwork, a site-specific health and safety plan (HASP) will be prepared. The <br /> HASP will include safety procedures for work to be performed, chemical hazard information, site <br /> safety officers, and a medical emergency location. The,HASP will be kept on site at all times <br /> during the site investigation work. <br /> 4.2 Soil Boring Advancement <br /> i <br /> —�_- <br /> WRM will advance to five soil bonngs�to groundwater using a limited access rig (LAR)and <br /> t track-mounted, direct push and auger techniques,if�nee ded, to further define the lateral extent <br /> of impacted soil north of the spill-area at-the-site. WRMiwill twin prior borings B1,'B2 and B3 <br /> (two vertical borings and one slant boring), and step out, as space allows, to advance three new <br /> borings at the locations shown on Figure 5. <br /> 4.2.1 Soil Sampling and Analysis <br /> i <br /> During advancement of the soil borings, undisturbed soil samples will be collected from acetate <br /> sleeves or brass tubes. A field geologist will log each of the undisturbed soil samples for <br /> k hydrogeologic and lithologic characteristics according to the Unified Soil Classification System <br /> and screen each sample for organic vapors using a phatoionization detector (PID). All borings <br /> will be continuously logged to the.extent site conditions permit. <br /> [. <br /> Based on field observations and PID measurements, up to two soil samples will be collected <br /> from proposed borings B-1 A, B-2A and B-3A and up to five soil samples will be collected from <br /> borings B-5, B-6 and B-7 to be submitted for laboratory'analysis. The soil samples will be <br /> sealed with Teflon®sheets and plastic end caps, labeled, placed in Ziploc®sealable bags, <br /> packaged in an iced cooler, and transported with chain-of-custody documentation to a state of <br /> California-certified hazardous waste testing laboratory for analysis. Each of the soilas miples will~ <br /> be-analyzed-on a standard turn-around time for TPH-D and.TPH:-G by-EPA_`M6thod-8'015M'and-, <br /> Fvolatile organic compounds, including BTEX'and-PCE, by EPA Method 826W <br /> I <br /> 9 <br />