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KNOWLES STATION Page 1 of 1 <br /> Path to Closure Plan GO GEOTRACKER HOME I MANAGE PROJECTS I REPORTS I SEARCH I LOGOUT <br /> KNOWLES STATION(T0607700078)-MAP THIS SITE OPEN-REMEDIATION <br /> 1140 HAMMER LN W CLEANUP OVERSIGHT AGENCIES <br /> ACTIVITIES REPORT SAN JOAQUINCOUNTY LOP(LEAD)-CASE#:1124 <br /> STOCKTON,CA 95209 CASEWORKER:ANGELICA SANDOVAL MARIN-SUPERVISOR:ADRIENNE ELLSAESSER <br /> SAN JOAQUIN COUNTY PUBLICWEBPAGE CENTRAL VALLEY RWQC8(REGION 5S)-CASE#'390107 <br /> VIEW PRINTABLE CASE SUMMARY FOR THIS SITE CASEWORKER:JAMES 06RTON-SUPERVISOR:CORI CONDON <br /> CUF Claim M 854 CUF Priority Assigned:B CUF Amount Paid:$352.834 <br /> THIS PROJECT WAS LAST MODIFIED BY NOEL HENDERSON ON 12/9/2013 4:04:14 PM-HISTORY <br /> THIS SITE HAS SUBMITTALS.CLICKS TO OPEN A NEW WINDOW WITH THE SUBMITTAL APPROVAL PAGE FOR THIS SITE. <br /> Path to Closure Plan THIS VERSION IS FINAL AS OF 12/9/2013 PATH TO CLOSURE HISTORY CLEAR/RESET PATH TO CLOSURE PLAN <br /> IMPEDIMENT 1: <br /> General Criteria F:Secondary source has NOT been removed to the extent practicable [ F Procedural Impediment-Wo l <br /> Step to Resolve Impediment 1-Step 1:-DELETE STEP COMPLETION DATE <br /> Impacted soil has been removed to the extent practicable by excavation, impacted groundwater (and <br /> possibly soil)continues to be Created by active shallow and deep ozone sparging. PROJECTED DATE ACTUAL DATE <br /> 6/30/2015 �— <br /> ADD ADDITIONAL STEP <br /> IMPEDIMENT 2-. <br /> Media Specific Criteria:Petroleum Vapor Intrusion to Indoor Air:The site is NOT considered low-threat for I— Procedural Impediment- INFO l <br /> the vapor-intrusion-to-air pathway and site-specific conditions do NOT satiety items 2a,2b,or 2c. <br /> Conditions that do not meet the policy criteria: <br /> • TPH in the Bioattenuation Zone:L 100 mglkg <br /> • Bioattenuation Zone Thickness:a 6 Feet and<10 Feet <br /> • 02 Data in Bioattenuation Zone:No 02 Data <br /> • Benzene in Groundwater:t 1,000 pgll <br /> • Soil Gas Benzene:Unknown <br /> • Soil Gas EthylBenzene:Unknown <br /> • Soil Gas Naphthalene:Unknown <br /> Step to Resolve Impediment 2-Step 1:-DEI FTE STEP <br /> COMPLETION DATE <br /> Continue to reduce benzene concentrations in groundwater through ozone sparging to concentrations less <br /> than 1,000 ppb; if necessary collect and analyze soil gas samples to evaluate the vapor intrusion hazard. PROJECTED DATE ACTUALDATE <br /> 6/30/2015 �— <br /> ADD ADDITIONAL STEP <br /> REQUIREMENTS ALONG PATH TO CLOSURE <br /> PUBLIC WELL <br /> DATE IDENTIFIED RP NOTIFICATION PARTICIPATION DESTRUCTION WASTE DISPOSAL LAND USE SITE CLOSURE <br /> FOR CLOSURE' IN DATE COMPLETION DATE r—DATE— DATE RESTRICTION DATE DATE <br /> ., �— �— I <br /> Date Identified for Closure is the date all Impediments to closure have b••n removed <br /> e Form' Completed Save Form as Complete <br /> LOGGED IN AS HENDERSONN CONTACT GEOTRACKER HELP <br /> https:Hgeotracker.waterboards.ca.gov/regulators/screens/clo sure_policy.asp?global_id=TO... 12/9/2013 <br />