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wells MW-23R and MW-26R located downgradient of Area I were 110 pg/L and 100 <br /> pg/L, respectively. <br /> C Zone <br /> Acenaphthene concentrations in the groundwater samples collected from the C-zone <br /> monitoring wells in September 2004 did not exceed 20 pg/L. <br /> 3.2 Assessment of Acenaphthene Concentrations in Groundwater <br /> Downgradient of the Site <br /> Based on the current monitoring data, the extent of acenaphthene concentrations <br /> exceeding 20 pg/L in groundwater downgradient of B-zone well MW-26R is not defined. <br /> Groundwater samples are proposed to be collected for laboratory analysis from an off- <br /> site location to assess the acenaphthene concentrations in the B zone downgradient of <br /> MW-26R. The proposed well installation and groundwater sampling are described in the <br /> following sections. <br /> Pre-Field Logistics <br /> A revocable permit and an encroachment permit will be obtained from the City of <br /> Stockton. The City permits, this work plan, and DTSC approval of this work plan will be <br /> submitted as an application to the San Joaquin County Environmental Health Services <br /> (County) for a permit to install monitoring well MW-27. After the County issues a permit <br /> and before field installation activities, Underground Service Alert will be notified for utility <br /> clearance. ENV America personnel will follow the health and safety procedures <br /> described in the Site Health and Safety Plan (included as Exhibit A) during field <br /> activities at the Site. <br /> Well Installation <br /> Well MW-27 is proposed to be completed in the B zone near the intersection of South <br /> Hunter Street and East Hazelton Avenue, approximately 270 feet downgradient of well <br /> MW-26R (Figure 3). The actual location of MW-27 may be modified based on existing <br /> underground and/or aboveground utilities in the area. <br /> The well will be installed using similar drilling method and well construction as the other <br /> existing B-zone wells. The screened intervals for wells MW-23R and MW-26R are <br /> completed between about 98 or 99 feet bgs and 113 or 114 feet bgs. The soil boring for <br /> well MW-27 is anticipated to be advanced to about 114 feet bgs using a drill rig <br /> equipped with hollow-stem augers. Continuous soil core samples will be collected from <br /> 9 ENV.";`; <br /> A M E R I C A <br /> P\PGSE\PGE-05-01 Stockton MW26R Inv sUgation\MW26 Work Plan\PGE Stockton MW26R WP.doc <br />