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Revised Remedial Action Plan <br /> Mo3illin Real Estate Investment Property <br /> 2154 South El Dorado Street,Stockton,California <br /> Page 9 <br /> In addition to the analyses listed in the table below, a soil composite sample will also be analyzed <br /> for California Assessment Manual 5 Metals by EPA Method 6010 for disposal purposes. Once the <br /> analytical results are reviewed, a proper disposal method will be determined. A total of twelve <br /> (12)soil samples from borings (MPE-1 through MPE-6) will be analyzed for the following: <br /> Analysis Abbreviation Desi nation USEPA Method No. <br /> Total Petroleum Hydrocarbons TPHg Gas/Diesel- <br /> as Gasoline Range 8260M <br /> Total Petroleum Hydrocarbons TPHd Hydrocarbons <br /> as Diesel <br /> Benzene <br /> Toluene Aromatic <br /> o e <br /> Eth uenene BTEX Volatile <br /> Organics <br /> X lenes Total <br /> Tertiary Butyl Alcohol TBA 8260B <br /> Methyl Tertiar , Butyl Ether MTBE <br /> Five Fuel <br /> Di-isopi-opyl Ether DIPE <br /> Oxygenates <br /> Ethyl Tertiary Butyl Ether ETBE <br /> Tertiary Ara 1 Methyl Ether TAME <br /> Groundwater Monitoring Well Development <br /> The services of a California C-57 licensed drilling contractor will be utilized to assist with the <br /> development of the newly installed MPE wells. Prior to well development activities, each well <br /> will be opened to allow for equilibration. Measurements of the depth to water and total depth of <br /> each well will be taken and recorded. Surging of each MPE well for 15 minutes will be completed <br /> to flush sediment from the well screen and the filter pack. Following well surging, two (2) well <br /> volumes will be removed from the well through disposable bailer. The wells will be allowed to <br /> recover (keeping track of the time it takes to recover) at which point a 2-inch submersible pump <br /> will be placed approximately six (6) inches off the bottom of each well. Once in place, at least <br /> three(3)well casing volumes will be pumped at a rate that is monitored to be the equivalent of the <br /> recharge rate at each MPE well. Water quality parameters temperature,pH,specific conductance, <br /> dissolved oxygen,and turbidity will be measured during the purging of each monitoring well using <br /> a Horriba U-50 (or similar) muttiparanreter instrument. After each well is pumped, Apex will <br /> collect grab groundwater samples for analysis of TPHg,BTEX,TPHd,and the five fuel oxygenates <br /> by EPA Method 8260, <br /> To prevent cross contamination in the wells and groundwater samples, all equipment will be <br /> decontaminated prior to use and in between use in each well using LiquinoxIM and rinsing with <br /> clean water. All purge and development water will be retained ousite in Department of <br /> Transportation-approved 55-gallon steel drums, pending proper disposal at an off-site location <br /> under manifest, <br />