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Soil Investiga•and Background Groundwater Monitorir*ell Installation Workplan January 17, 2007 C A M B R I A on the north and northwest, San Joaquin River on the west, Stanislaus River on the south, and consolidated bedrock on the east.The San Joaquin River flows northward into the Sacramento and San Joaquin Delta and discharges into the San Francisco Bay.The beneficial uses of the Mokelumne River downstream of the Camanche Reservoir to the Delta include:municipal and domestic supply; agricultural supply including both irrigation and stock watering;water contact and non-body contact recreation; warm freshwater aquatic habitat; cold freshwater aquatic habitat; migration of aquatic organisms(both warm and cold habitats),warm and cold habitat spawning,reproduction,and/or early development; and wildlife habitat. The Mokelumne River is located approximately 170 feet south of the proposed ® infiltration/evaporation pond.Based on local topography and the location of the Mokelumne River, groundwater within the vicinity of the site is inferred to flow to the south-southwest toward the river and is anticipated to be between approximately 15 and 25 feet below grade (fbg). During the November 2005 investigation,groundwater was not encountered at the maximum explored depth of 61h feet in the test pits. PROPOSED SCOPE OF WORK The objectives of this investigation are to advance a soil boring in the center of the proposed infiltration/evaporation pond to determine infiltration characteristics by measuring physical properties and soil types beneath the pond, and to install a network of groundwater monitoring wells to determine baseline groundwater quality,depth,and flow direction.In addition,the wells will be used to conduct slug tests to determine the shallow aquifer's hydrologic characteristics. Once the infiltration/evaporation pond is operational,the wells will be used to monitor the pond's influence on local groundwater. The wells will be installed upgradient(to the north) and downgradient (to the south and southwest)of the proposed infiltration/evaporation pond(Figure 2). Cambria proposes the following tasks to complete this scope of work: Site Health and Safety Plan: To protect the public and site personnel during the fieldwork, a site- specific Site and Safety Plan (SSP)will be distributed to all members of the project team. The SSP addresses physical health threats posed by drilling. The SSP also prescribes appropriate personal protective equipment(PPE) to protect site workers. Permits: Prior to initiating field activities, Cambria will obtain boring and well permits for the proposed wells from the San Joaquin County Environmental Health Department. 4