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. 25 January 2001 AGE-NC Project No 99-0559 Page 8 of 14 5 3 INSTALLATION AND DEVELOPMENT OF MULTI-LEVEL MONITORING WELLS AGE proposes to install six `multi-level' ground water monitoring wells at the site as part of the planned site assessment Proposed `multi-level well locations are Illustrated in Figure 2, the total number of`multi-level' screens within each well, the screen intervals and total depth of each `multi- level' well will be based on an interpretation of data collected from the CPT soil borings Well locations and screen intervals are proposed to provide delineation of the lateral and vertical extent of dissolved hydrocarbons and fuel oxygenated compounds Monitoring of the wells should provide data to assess the vertical and horizontal extent and to monitor migration of the dissolved MTBE plume in suspected preferred flow units Proposed monitoring well locations are illustrated on Figure 2 The proposed wells will be installed in the following locations • At the east edge of the UST location, 15 feet northeast of monitoring well MW-2 immediately adjacent to the former UST area, • South of UST#1, near soil boring Bl, southwest and down-gradient of the suspected release, • Near the west property boundary, cross gradient to well MW-4, 0 • Forty feet north of Waterloo Road on Sutro Way, • In the southern lot of the neighboring property on the east, cross gradient to the UST area and near the neighboring domestic well, and • Approximately 175 feet southwest of the site on the western edge of Chronicle Street down gradient and somewhat cross gradient of the former UST area Following installation, each well will be developed to maximize water flow into the well and minimize the amount of fine-grained sediment drawn into the well during pumping or bailing Procedures for well installation and development are presented in Sections 6 2 through 6 6 , respectively 5 4 MONITORING AND SAMPLING GROUND WATER Ground water monitoring and sampling activities for each newly installed ground water monitoring well will be conducted on a quarterly basis until PHS-EHD notification or approval to do otherwise Ground water monitoring activities will Include recording depth to ground water measurements and collection of ground water samples for laboratory analysis Ground water sample collection procedures are described in Section 6 Ground water samples will be analyzed for the constituents listed in Section 4 3 Laboratory reports for ground water analyses, testing methods, laboratory QA/QC reports, and Advanced CeoLnvironmentai,Inc