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ARCUIS Bet Ms.Victoria McCartney <br /> July 12, 2007 <br /> Based on the results of second quarter 2007 groundwater monitoring and sampling <br /> event,groundwater is anticipated at a depth of approximately 20 feet bgs. Therefore, <br /> ARCADIS BBL proposes the installation of four monitoring well clusters consisting of <br /> a shallow well and deep wells as described below. <br /> Site Specific Health and Safety Plan <br /> As required by the Occupational Health and Safety Administration(OSHA)Standard <br /> "Hazardous Waste Operations and Emergency Response"guidelines(29 Code of <br /> Federal Regulations Section 1910.120), and by California Occupational Health and <br /> Safety Administration(Cal-OSHA)"Hazardous Waste Operations and Emergency <br /> Response"guidelines(California Code of Regulations Title 8, Section 5192), <br /> ARCADIS BBL will prepare a site-specific health and safety plan(HASP)prior to <br /> commencement of fieldwork. Field staff and contractors will review the HASP before <br /> beginning field operations at the site. <br /> Permitting <br /> Applicable permits will be obtained from the City of Stockton and the County as <br /> necessary, prior to commencing field activities. <br /> Underground Utility Line Locating <br /> Underground Service Alert(USA)will be notified at least 48 hours before drilling <br /> activities to identify public utilities in the vicinity of the proposed borings. In <br /> conjunction with the USA, a private utility locating company will be utilized to further <br /> evaluate boring locations relative to underground utilities. <br /> Groundwater Monitoring Well Installation <br /> Eight monitoring wells(four shallow and four deep)will be advanced at the locations <br /> shown on Figure 1. Prior to drilling, each location will be hand cleared using either an <br /> air knife or hand auger to a minimum depth of 8-feet 1-inch(utility clearance depth) <br /> bgs. It is anticipated that the shallow zone wells will be screened at an approximate <br /> depth interval of 17 to 27 feet bgs and the deep zone wells will be screened at an <br /> approximate depth interval of 50 to 60 feet bgs. The exact depths of the well screen <br /> intervals will be determined in the field based on the soil lithology observed in the <br /> deep soil borings to be sampled continuously, as described below. <br /> Page: <br /> ciory nmocom. awmim w�nvu"aa 2/5 <br />