SITE INFORMATION AND CORRESPONDENCE 2011-2015

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WELDON CHURCH RESIDE' -"E Page 1 of 1 ,%W-' ---e Path to Closure Plan zi EG01 GEOTRACKER HOME I MANAGE PROJECTS I REPORTS SEARCH I LOGOUT WELDON CHURCH RESIDENCE(T0607700214)-MAP THIS SITE OPEN-REMEDIATION 104 BEVERLY PL W CLEANUP OVERSIGHT AGENCIES ACTIVITIES REPORT SAN A—,O N COUNTY LOP(LEAD)-CASE#:2253 TRACY,CA 95376 CASEWORKER:VICKI MCCARTNEY-SUPERVISOR:ADRIENNE ELLSAESSER SAN JOAQUIN COUNTY PUBLICWEBPAGE CENTRAL VALLEY RWOCB(REGION 5S)-CASE#:390292 CASEWORKER:JAMES 6ARTON-SUPERVISOR:CORI CONDON VIEW PRINTABLE CASE SUMMARY FOR THIS SITE CUF(Wim#:0502 CUF Priority Assigned:B CUF Amount Paid:3383.033 THIS PROJECT WAS LAST MODIFIED BY VICKI MCCARTNEYON 10/11/2013 2:10:11 PM-HISTORY THIS SITE HAS SUBMITTALS.CLICK HERE TO OPEN A NEW WINDOW WITH THE SUBMITTAL APPROVAL PAGE FOR THIS SITE. Path to Closure Plan THIS VERSION IS FINAL AS OF 10/11/2013 PATH TO CLOSURE HISTORY CLEAR/RESET PATH TO CLOSURE PLAN IMPEDIMENT 1: General Criteria F:Secondary source has NOT been removed to the extent practicable F Procedural Impediment-INFO Difficult Site Conditions DATE RESOLVED Step to Resolve Impediment 1-Step 1:-DELETE STEP COMPLETION DATE JReduce secondary source that contributes to the vapor intrusion problem on this residential site. A vapor mitigation system was installed in the crawl space beneath the home in June 2012 and is in ROJ CTE D ACTUAL DATE operation, but the vapor intrusion problem should be addressed prior to site closure. __12/15/2015 �— ADD ADDITIONAL STEP IMPEDIMENT 2. Media Specific Criteria:Petroleum Vapor Intrusion to Indoor Air:The site is NOT considered low-threat for F Procedural Impediment-INFo the vapor-intrusion-to-air pathway and site-specific conditions do NOT satisfy items 2a,2b,or 2c. Difficult Site Conditions DATE RESOLVED Conditions that do not meet the policy criteria: • Exposure Type:Residential • TPH in the Bioattenuation Zone:>_100 mg/kg • Bioattenuation Zone Thickness:i 5 Feet and<10 Feet • 02 Data in Bioattenuation Zone:No 02 Data • Soil Gas Benzene:>_85 pg/m3 and<280 Ng/m3 • Soil Gas Naphthalene:Unknown Step to Resolve Impediment 2-Step 1:-DELETE STEP COMPLETION DATE Site has not been demonstrated to have at least a 5-foot bioattenuation zone; need to collect additional soil samples to show current conditons. Need to remediate soil impacted by excessive concentrations of PROJECTED DATE ACTUAL DATE benzene and ethylbenzene. Additional soil gas sampling may be appropriate, at which time oxygen and 12/15/2015 �— cnhthlun< .-an hu acccccc�i ADD ADDITIONAL STEP IMPEDIMENT 3: Media Specific Criteria-Direct Contact and Outdoor Air Exposure:The site is NOT considered low-threat F Procedural Impediment-INFO for direct contact and outdoor air exposure as it does NOT meet 1,2,or 3. Difficult Site Conditions DATE RESOLVED Conditions that do not meet the policy criteria: • Exposure Type:Residential • Petroleum Constituents in Soil:<_5 Feet bgs • Soil Concentrations of Benzene:>14 mg/kg • Soil Concentrations of EthylBenzene:>89 mg/kg and<_134 mg/kg • Soil Concentrations of Naphthalene:Unknown • Soil Concentrations of PAH:Unknown Step to Resolve Impediment 3-Ste 1:-DELETE STEP COMPLETION DATE Soma additional assessment may be appropriate to better characterize the impacted soil issue which must - PROJECTED DATE ACTUAL DATE be addressed on this residential property. 12/15/2015 ADD ADDITIONAL STEP REQUIREMENTS ALONG PATH TO CLOSURE DATE IDENTIFIED RP NOTIFICATION PUBLIC PARTICIPATION WELL DESTRUCTION WASTE DISPOSAL LAND USE FORCLOSURE* CLOSURE INITIATED BY DATE COMPLETION DATE DATE r�DATE RESTRICTION DATE SITE CLOSURE DATE I— F— I 'Date identified for Closure is the date all impediments to closure have been removed Save Form as Partially Completed Save Fonn as Complete LOGGED IN AS MCCARTNEYV CONTACT GEOTRACKER HELP https://geotracker.waterboards.ca.gov/regulators/screens/closure_policy.asp?global_id=T... 12/12/2013