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r iMs Margaret Lagorio, Supervising RF-HS Page 4 San Joaquin County Environmental Health Department October 11, 2004 r WORKPLAN FOR ADDITIONAL ASSESSMENT Analytical data from the March 2004 investigation determined that the western extent of 1,2-DCA- impacted groundwater is not yet defined In addition, during recent telephone conversations, SJCEHD reaffirmed their interest in defining/monitoring the eastern extent of impacted groundwater between the site and municipal well#1R Based on current information, URS proposes the following • Advance one vertical soil boring on Lodi Avenue west of the site and collect a grab sample to define the western extent of 1,2-DCA impacted groundwater • Install one shallow groundwater monitoring well on the east side of Cherokee Lane between the site and the City of Lodi municipal well to monitor the eastern extent of impacted groundwater • Install one on-site deep groundwater monitoring well in the area reporting the highest 1,2-DCA concentration to assess the vertical extent of impacted groundwater Presented below is a discussion of permitting, underground utility location, drilling and soil sampling, groundwater grab sampling, shallow and deep monitoring well installation, groundwater monitoring well development, sampling, and surveying, equipment decontamination and soil cutting and wastewater disposal procedures, and report preparation Permitting The City of Lodi and SJCEHD require that soil boring permits be obtained prior to drilling URS will submit the appropriate permit application(s) with fees to the City of Lodi and SJCEHD prior to conducting any field activities Utility Underground Location g U ty All proposed drilling locations will be marked, and Underground Service Alert (USA) will be notified a minimum of 48 hours prior to commencement of any field activities for each phase of work A private utility locator will also be contracted to survey proposed boring locations for private utilities prior to _ commencement of field activities In addition, the first 5 feet bgs in each boring will be cleared with an air or water kntfe to a diameter of 8 25 inches rDrilling and Soil Sampling Three vertical borings will be drilled using an HAS-equipped drill rig (see Figure 2 for locations) Two of the borings will be located off site and will be advanced to first encountered groundwater A shallow 2-inch-diameter groundwater monitoring well will be constructed in one of the borings, and grab r K lwprocess\J5 BP ARCO10076012004 Assessment1760 site assessment report with workplan V2 04 doc