WORK PLANS_CASE 2 FILE 2 - Laserfiche WebLink

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Mr. Ron Rowe CAMBRIA July 11, 1997 The specific tasks to be performed include: Utility Location: Cambria will notify Underground Service Alert of our drilling activities to identify utilities in the site vicinity. Site Health and Safety Plan: We will prepare a comprehensive site safety plan to protect site workers. The plan will be kept on site at all times and signed by all site workers. Permits: We will obtain well permits from the San Joaquin County Department of Public Health Seryices (SJCPHS)for the installation of the well. Soil Boring: Cambria will drill one soil boring to approximately 45 feet depth to define the extent of hydrocarbons below the source area. Our proposed boring location is shown on Figure 2. Our sampling protocol is described in Attachment A. We will select soil samples for chemical analysis based on observations of staining and odor and on the results of field screening with a portable vapor analyzer. Based on your information, we anticipate encountering ground water at an approximate depth of 30 feet. Monitoring Well Construction: The boring will be converted into a two-inch diameter ground water monitoring well screened about 5 feet above and 15 feet below the static water table(Figure 2). The well head will be sealed and locked beneath a traffic-rated vault. Well Development and Sampling: Cambria will develop the monitoring wells using surge block agitation and ground water evacuation and will sample the well at least 48 hours after development. Before purging the well for sampling we will measure the depth to water using an electronic depth sounder. We will record pH, electrical conductivity, and temperature during the well purging and will sample only when these parameters stabilize. Specific well development and sampling procedures are described in Attachment A. Chemical Analysis:The soil and ground water samples will be analyzed for TPHg;benzene,toluene,ethyl benzene,and xylenes,(BTEX)and methyl tert-butyl ether(MTBE)by EPA Methods 8015/8020. If MTBE is detected, we will confirm the highest MTBE sample using EPA Method 8260. Reporting: After the analytic results are received,we will prepare a subsurface investigation report that, at a minimum, will contain: • A summary of the site background and history, • Descriptions of the drilling and soil sampling methods, • Boring log and well construction diagram, l