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Report:Site Closure Document. 7500 West Eleventh Street, Tracy, CA. pa aq 11 RECEIVED Table of Contents .,0N 2 6 2012 ENVIRONMENTAL HEALTH PROFESSIONAL CERTIFICATION AND LIMITATIONS....................PERMIT/SERVICES til 1.0 INTRODUCTION....................................................... 1 1.1. Site Location .......................................................... 1 1.2 Site Codes.................................... 1 1.3 Background.........................................................................................................---- •........... 1 2.0 CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUEST AT UNDERGROUND TANK SITES..................................................... 3 2.1 Distance to Production Wells for Municipal, Domestic,Agriculture, Industry and Other Uses within 2000 ft. of Site....... 3 2.2 Site Maps to Scale, of Area Impacted Showing Locations of Any Former and Existing Tank Systems, Excavation Contours and Sampling Locations, Boring and Monitoring Well Elevation Contours, Gradients, and Nearby Surface Waters, Buildings Streets,and SubsurfaceUtilities.............................................................................................................3 2.3 Figures Depicting Lithology(Cross Sections),Treatment System Diagrams ....................4 2.4 Stockpiled Soil Remaining On-site or Off-site Disposal(Quantity)...................................4 2.5 Monitoring Wells Remaining on Site, Fate...................................... 2.6 Tabulated Results of All Groundwater Elevations and Depths to Water............................ 5 2.7 Tabulated Results of All Sampling and Analysis: Detection Limits and Lead Analyses... 5 2.8 Concentration Contours of Contaminants Found and Those Remaining in Soil and Groundwater,and Both On-site and Off-site: Lateral and Vertical Extent of Soil Contamination and Lateral and Vertical Extent of Groundwater Contamination...............6 2.9 Zone of Influence Calculated and Assumptions Used for Subsurface Remediation Systems and the Zone of Capture Attained for Soil and Groundwater Remediation Systems........... g..... .8 2.10 Reports/Information: Unauthorized Release Form,QMR(Dates), Well and-Boring Logs, PAR, FRP. Other(Report Name)....................................... .... g ............................................. 2.11 Best Available Technology(BAT)Used or an Explanation for Not Using BAT............ 14 2.12 Reasons Why Background was/is Unattainable Using BAT................. .... 16 .................... . 2.13 Mass Balance Calculation of Subsurface Treated Versus that Remaining...................... 16 2.14 Assumptions, Parameters,Calculations, and Model Used in Risk Assessments, and Fate and Transport Modeling................................ ........---•.... 20 ............................... . 2.15 Rationale Why Conditions Remaining on Site Will Not Adversely Impact Water Quality, Health, or Other Beneficial Use.................. ....................................................................21 2.16 WET or TCLP Results.............................. ......21 3.0 CURRENT MASS ESTIMATES OF RESIDUAL AND ADSORBED CONTAMINANTS ......................................................................................................... ...............................22 4.0 RECORD FEE TITLE OWNERS FORM AND CERIFICATION THAT ALL RECORD FEE OWNERS HAVE BEEN NOTIFIED OF PENDING SITE CLOSURE............................23 5.0 WORK PLAN FOR DESTRUCTION OF GROUNWATER-QUALTY MONITORING WELLS ............................................. .....24 6.0 OWNERS OF PROPERTY THAT HAS OR MAY BE AFFECTED BY UAR..................25 7.0 SUMMARY OF THE CURRENT STATUS AND PROJECTED FUTURE STATUS OF PLUME OF DISSOLVED CONTAMINANTS................... ...26 DEC