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• Environmental <br /> Resources <br /> San Joaquin County Management <br /> 19 August 2004 <br /> Page 2 <br /> SCOPE OF WORK <br /> To evaluate baseline conditions at the site, ERM will complete a <br /> subsurface investigation that includes the advancement of two soil <br /> borings for the collection of soil samples. <br /> Soil Sampling <br /> Prior to commencing drilling activities,ERM will work closely with <br /> facility personnel to identify underground utilities in the investigation <br /> areas. ERM will also contact Underground Services Alert to clear the <br /> proposed boring locations of proximity to underground utilities. In <br /> addition, the first 5 feet of each boring (below pavement) will be cleared <br /> with a hand auger. <br /> Direct push drilling techniques will be utilized to advance two soil <br /> borings at the facility in the approximate locations shown on Figure 2. <br /> The borings will be advanced to a maximum depth of 20 feet below <br /> ground surface (bgs). Soil samples will be collected continuously in <br /> acetate sleeves at each location and an ERM geologist will log each <br /> boring and classify the soil samples according to the Unified Soil <br /> Classification System. Each sample interval will be screened in the field <br /> for the presence of volatile organic compounds (VOCs) using an organic <br /> vapor monitor (OVM) equipped with a photoionization detector. Field <br /> evidence of petroleum hydrocarbon impacts, such as noticeable <br /> petroleum odors or staining,will also be noted in the boring logs. <br /> Sample intervals will be selected from each boring for laboratory analysis <br /> based on field observations (e.g., elevated VOC readings detected with <br /> an OVM, staining, and/or noticeable petroleum odors). In the event that <br /> no evidence of impacts is observed in a boring, ERM will select two <br /> sample intervals from the boring for laboratory analysis based on the <br /> following criteria: <br /> At the boring locations advanced in equipment storage areas one <br /> sample will be submitted from the one foot bgs and one sample will <br /> be submitted from the total boring depth; and <br /> At the boring locations advanced adjacent to the equipment wash <br /> rack, one sample will be submitted from one foot bgs and one sample <br /> will be submitted from the approximate depth of the bottom of the <br /> wash rack sump. <br />