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McBillin Real Estate Investment Property Page 2 of 3 <br /> 2154 South EI Dorado Street November 20 , 2014 <br /> Stockton, California 95206 <br /> e Locating one boring/monitoring well pair approximately 150 feet south of the site in the <br /> McKinley Park parking lot; <br /> O Locating one boring/monitoring well pair approximately 220 feet southeast of the site at <br /> the northern property line of McKinley Park; <br /> 9 Locating one boring/monitoring well pair approximately 450 feet northeast of the site in <br /> the City of Stockton right-of-way on the west side of the 2100-block of South San <br /> Joaquin Street; <br /> S Constructing each monitoring well using two-inch-diameter Schedule 40 polyvinyl <br /> chloride casing with 0. 020-inch slotted well screens; <br /> Following installation of the well casing , constructing the well by installing into the <br /> annular space pre-washed No . 3 Lonestar sand from total depth to approximately two <br /> feet above the screened interval followed by three feet of bentonite chips (allowed to <br /> hydrate for the duration of time specified by the manufacturer) prior to grouting through <br /> a tremie pipe or augers to within one foot of the ground surface with type 1/11 portland <br /> neat cement grout; <br /> A Surveying the newly-installed wells; <br /> Analyzing selected soil samples from the four deep soil borings and grab groundwater <br /> samples collected at approximately ninety 'feet bsg for total petroleum hydrocarbons <br /> (TPH) as gasoline (TPH-g); TPH as diesel (TPH-d) ; benzene, toluene, ethylbenzene <br /> and total xylenes (BTEX); naphthalene, tertiary-amyl methyl ether (TAME) , di-isopropyl <br /> ether (DIPE) , and 1 , 2-dichloroethane ( 1 ,2-DCA) ; <br /> Submitting a report of findings following the installation of the four monitoring wells ; and <br /> Collecting groundwater quarterly from each of the newly-installed wells for a minimum of <br /> one year for chemical analysis for TPI-1-g , TPH-d, BTEX, naphthalene , DIPE , TAME and <br /> 1 , 2-DCA. aa <br /> The EHD approves the Work Plan Addendum with the following conditions: I duate� <br /> ® One additional deep soil boring/monitoring well pair is needed northeast of monitoring <br /> well MW-2 and GW-2 where significant: concentrations of contarninants of concern have <br /> been detected in groundwater samples ; submit a revised work plan illustrating the <br /> proposed location of the additional monitoring well northeast of GW-2; <br /> ® Install the four monitoring wells with screen intervals that target the sand interval <br /> encountered variously between thirty-two and forty-seven 'feet bsg ; <br /> Hydrate the bentonite chips for at least thirty minutes ; and <br />