WORK PLANS_2006-2007 - Laserfiche WebLink

Home Browse Search

SUR limit (Figure 4). Due to the static PCE concentrations observed in the A-zone and B-zone aquifer within the vicinity of the Bank of Stockton, LFR proposes to utilize data collected from the proposed MIP investigation to assist in designing and implementing an enhanced bioremediation pilot study of chlorinated solvents through anaerobic degradation of PCE in this area. The capabilities of the MIP technology were demonstrated previously in the Historical Source Area of the Site by advancing 15 test borings, which were advanced by Vironex and Precision under the supervision of LFR staff. This work was also observed by Ms. Marie McCrink of the RWQCB and Mr. Mike Infurna of San Joaquin County Environmental Health. Overall, the MIP detector was able to detect the presence of chlorinated solvents in the Historical Source Area and to assess their vertical distribution. The following sections describe investigation objectives; a scope of work; and data analysis, reporting, and schedule for the completion of the focused MIP investigation. MIP Investigation Objectives Field applications of lactate injection remediation technology by LFR and others have shown that effective lactate delivery is key to successful implementation and achievement of performance goals. The purpose of the focused MIP investigation proposed in this work plan is to aid in the design of an effective lactate injection delivery system by assessing the extent of the permeable sediments and of the chlorinated solvents in the vicinity of the Bank of Stockton. The investigation will involve the simultaneous collection of MIP data and electrical conductivity (EC) or cone penetration testing (CPT) data and will yield both relative chlorinated solvent concentration and lithological data to better define and more accurately assess affected sediments within vicinity of the Bank of Stockton. The overall objectives of the MIP investigation are: • to assess the vertical and lateral extent of the relatively higher concentrations of chlorinated solvents in and adjacent to the area near the Bank of Stockton, using MIP technology • to simultaneously collect EC or CPT data to obtain detailed lithological data • to collect five grab groundwater samples to calibrate and validate the MIP data to use the MIP and EC/CPT data together to identify lithologic zones that are preferentially affected by relatively elevated chlorinated solvent concentrations. Investigation results will be used to design the layout (i.e., number of wells, distribution, and screen interval/depth) of lactate injection and observation wells The specific tasks are discussed below. xp-1inco1n-MIP-Apr06-o6750.d«:Irt 2