WORK PLANS - Laserfiche WebLink

Home Browse Search

0 Work Plan for Groundwater Investigation and Groundwater Monitoring Well Installation Field Maintenance Shop #24, Stockton, California 0 • Based on the results of the MIP study and additional groundwater chemical evaluation, develop a strategy for implementing a pilot study to test the viability of ISCO as a remedial option for the site. To achieve the stated project objectives, the following scope of work has been developed: • Advance 15 MIP borings in the vicinity of the former USTs and within the presumed source area for impacts to groundwater from petroleum hydrocarbons and related compounds at the site; • Analyze the MIP data for the purpose of strategically locating two new groundwater monitoring wells within the primary source area; • Using results from the MIP study, install and develop two new groundwater monitoring wells at optimal locations within the primary source area for petroleum hydrocarbons and related compounds; • Collect soil samples in well bores to confirm semi -quantitative findings for volatile organic compounds (VOCs) identified from the MIP study; • Install and develop one new groundwater monitoring well in the southeastern portion of the site for the purpose of providing improved upgradient and/or crossgradient control for groundwater conditions at the site; • Collect groundwater samples from the new wells to confirm semi -quantitative concentrations of VOCs identified in the MIP study and to evaluate upgradient and/or crossgradient groundwater conditions at the site; • Conduct additional groundwater analysis on the two new wells within the primary source area for petroleum hydrocarbons and related constituents, and two existing groundwater monitoring wells at locations outside of the primary source area for the purpose of: o Evaluating the potential suitability of ISCO for remediating groundwater impacts under the lithologic and geochemical conditions found at the site; and o Establishing a baseline for future performance monitoring of ISCO as a remedial alternative, should it be shown with future treatability testing to be viable at the site; and • Conduct specific capacity testing on at least two wells within the primary source area and two wells outside of the primary source area for the purpose of evaluating the approximate hydraulic conductivity and rate of groundwater flow. All activities associated with the proposed scope of work will be performed to meet the CVRWQCB's directives pursuant to the Clean Water Act and California's Porter -Cologne Water Quality Act. 1.2 SITE DESCRIPTION AND HISTORY The site is located at 8010 South Airport Way, Stockton, California (Figure 1; Appendix A). It is one of four state-owned divisional areas operated by the CA ARNG, including the Army Aviation Support Facility (AASF), the Armory, and the Combined Support Maintenance Shop (CSMS). The areal relationship of these divisional areas to each other is indicated in Figure 2 (Appendix A). The FMS consists of a one-story maintenance building composed of work bays, OTIE 2