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2255 S. Airport Way, Stockton <br /> Page 2 <br /> of Stockton building permit required to install the remediation system so that installation <br /> of the system is not delayed. <br /> The lateral and vertical extent of the soil and groundwater contamination at this site have <br /> not been defined. There were concentrations of contaminants found in the soil samples <br /> from SBI from 30 feet below surface grade (bsg) to its total depth of 86 feet bsg. Soil <br /> samples from VW 1 from 15 feet bsg to its total depth of 52 feet bsg also had <br /> concentration of contaminants. The groundwater monitoring wells are monitoring first <br /> water (approximately 40 feet bsg) to a depth of 55 to 60 feet bsg. The highest <br /> contaminant concentrations are seen in the water samples from MW1. The first water <br /> zone is somewhat defined by water samples from MW4, MW7, MW2 and MW8. The <br /> first water zone is not defined to the east of MW6. In addition, deeper zones of <br /> groundwater have not been investigated to demonstrate that the groundwater <br /> contamination is vertically defined. Although, soil vapor extraction and air sparging have <br /> been approved to remediate the vadose zone and first water zone, if deeper contamination <br /> is found additional remedial alternatives may need to be evaluated. Please note that for <br /> soil and groundwater contamination to be defined, there should be no detection of <br /> contaminants laterally and vertically from the source area. Submit a workplan to EHD <br /> for further investigation of the lateral and vertical extent of the contamination by January <br /> 16, 2007. <br /> Analysis for MTBE, DIPS, ETBE, TAME, TBA, methanol, and ethanol was performed <br /> on the water samples from MWI through MW4 collected on July 31,2003, with results <br /> below detection limits. No other testing has been done for these constituents. The EHD <br /> directs that analysis for these contaminants be conducted for at least the next two <br /> quarterly sampling events in all of the monitoring wells at the site (MW 1 through MWS). <br /> If you have any questions,please contact Frank Girardi at (209) 953-7868. <br /> Donna Heran, RENS, Director <br /> Environmental Health Department <br /> vet <br /> Frank Girardi , Senior RENS Margaret agorio, REHS <br /> LOP/Site Mitigation Unit IV Program Coordinator <br /> i <br /> c: Horizon Environmental Inc. —Rexford Smith <br /> c: RWQCB, Central Valley Region—Jim Barton <br /> I <br /> f <br />