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.. . .. ........ .. Extended Site Characterization Report: 7500 West Eleventh Street, Tracy, CA. Page ji 7.2.1 23 801 and 23901 Chrisman Road................................................................. 28 7.2.2 7777 West Eleventh Street............. ...............................................................29 7.2.3 7685 West Eleventh Street............................................................................ 29 7.2.4 7474 West Eleventh Street............................................................................ 30 7.2.5 24195 Chrisman Road................................................................................... 31 7.3 Plumes Emanating from the 7500 West Eleventh Street Site............................... 31 7.3.1 Sources .......................................................................................................... 32 7.3.1.1 Tank Pit No. I........................................................................................ 32 7.3.1.2 Tank Pit No. 2...................................................................... ................. 32 7.3.1.3 Dispenser Pit.......................................................................................... 33 7.3.1.4 Pipe Trenches ........................................................................................ 33 7.3.1.4.1 Pipe Trench No. I .......................................................................... 34 7.3.1.4.2 Pipe Trench No. 2.......................................................................... 34 7.3.2 Primary Plume of Diesel and Gasoline........................................................ 35 7.3.2.1 Primary Plume Beneath North Side of Subject Property...................... 38 7.3.2.2 Primary Plume-to the North of West Eleventh Street............................ 41 7.3.2.3 Hydraulic Conductivity and Rate of Primary Plume Migration............42 7.3.3 Secondary Plume........................................................................................... 46 8.0 POTABLE WATER, IRRIGATION AND OTHER WELLS NEAR SITE ............ 48 8.1 U.S.G.S and Electronic Database Searches ..........................................................48 8.2 Field and County and State Record Searches . .......................................................48 8.3 Compilation of Well Data..................................................................................... 49 8.3.1 Potable Water-supply Well at 7500 West Eleventh Street............................49 8.3.2 Potable Water-supply Well at 24169 South Chrisman Road........................ 50 8.3.3 Potable Water-supply Well at 7601 West Eleventh Street............................ 50 1 8.3.4 Potable Water-supply Well at 23901 South Chrisman Road........................ 50 I A 8.3.5 Potable Water-supply Well at 23950 South Chrisman Road........................ 50 8.3.6 Potable Water-supply Well at Carmelo Business Park................................ 51 9.0 CONCLUSIONS....................................................................................................... 52 9.1 Tank and Infrastructure Removal.......................................................................... 52 9.2 Primary Plume....................................................................................................... 52 9.3 Secondary Plume................................................................................................... 53 9.4 Hydrocarbons in Shallow Soils............................................................................. 53 10.0 RECOMMENDATIONS.......................................................................................... 55 10.1 Sampling and Analysis of Groundwater in Water Supply Wells........................ 55 10.2 Modification of Groundwater-quality Monitoring Schedule.............................. 56 i.j 10.3 Closure of Wells Penetrating to Deep Aquifers.................................................. 56 10.4 Removal of Floating Product from Groundwater............................................... 57 11.0 REFERENCES ......................................................................................................... 60 sic