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' Off-Site Groundwater Investigation Work Plan Page 6 Rainwater Car Wash, Manteca, California 95336 May 30, 2012 ' 5.2.2 Pre-field Inspection and Access ' Prior to fieldwork,AA&A will conduct a site reconnaissance and will mark all proposed boring locations with white paint. Well installation locations will be inspected for site accessibility,underground utilities,and to identify additional potential issues that may be encountered during fieldwork. 5.2.3 Permitting and Agency Notification Well installation permits will be obtained from the San Joaquin County Environmental Health Department ' (SJCEHD)prior to initiating field activities.The SJCEHD will be notified at least 48 hours before drilling activities are commenced at the site so that representatives from the agencies can be present during the fieldwork to inspect boring locations and observe well abandonment activities. ' Two monitoring wells are proposed within the public right-of-way(ROW)along the sidewalk of West Yosemite Avenue and Rose Lane. An encroachment permit will be obtained from the City of Manteca Public Works Department prior to initiating the installation of wells located within the ROW.One well is proposed on private ' property directly north of the subject site. AA&A will attempt to secure right-of-entry from the property owners. 5.2.4 Underground Utility Survey ' Underground Services Alert(USA)will be notified at least 48 hours before the intent to complete well installation activities prior to initiation of intrusive field tasks.All well installation locations will be clearly marked with ' white paint as required by USA. USA will contact all utility owners of record within the vicinity and notify them of the intention to conduct subsurface investigations in proximity to buried utilities.All utility owners of record, or their designated agents, will be expected to clearly mark the position of their utilities on the ground surface throughout the area designated for investigation so that they can be avoided during drilling. ' 5.3 Drilling Activities 5.3.1 Monitoring Well Locations The locations of the proposed monitoring wells were chosen to define the extent of petroleum hydrocarbons contamination in soil and groundwater. The proposed monitoring wells are shown on Figure 3.The borings are proposed off-site and down-gradient from the source area at the following locations: • MW 14A/B northwest of the subject site located on the northern sidewalk of West Yosemite Avenue, approximately 30 feet east of the intersection of West Yosemite Avenue and Rose Lane,south of the property located at 541 West Yosemite Avenue; • MW 15A/B northwest of the subject site on Rose Lane, approximately 155 feet north of the intersection of West Yosemite Avenue and Rose Lane,west of the property located at 112 Rose Lane; and ' • MW 16A/B northwest of the subject site on the property located at 429 West Yosemite Avenue, directly north of the structure on-site,approximately 170 feet north from the edge of the property line along West Yosemite Avenue. ' 5.3.2 Hollow-Stem Auger Drilling Method and Soil Sample Collection Borings MW 14 through MW 16 will be advanced using an open-flight,hollow-stem auger drill rig to 70 feet bgs. ' The upper 5 feet of the well locations will be manually excavated with a hand-auger to the diameter of the augers. Ami ' &Rs"sociciatesJnc.