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. Mr. Mike Infurna <br /> Page 2 <br /> boreholes were non-detect for benzene and TPHg and groundwater samples from the <br /> boreholes may have been cross-contaminated, make well construction problematic If, as <br /> anticipated, it is determined in the field that unconfined conditions exist, the monitoring wells <br /> will be constructed with screened intervals beginning approximately 5 feet above and <br /> extending approximately 15 feet below the water table Alternatively, if confined conditions <br /> are confirmed, a ten foot length of screen will be placed opposite the saturated zone to <br /> prevent groundwater from coming in contact with overlying contaminated soil If it cannot <br /> be determined whether or not confined conditions prevail it may become necessary to <br /> construct pairs of deeper and shallower monitoring wells This would be conducted as a <br /> second phase of well installation. <br /> • Permits Monitoring well construction permit applications are enclosed along with the <br /> required fees To be conservative the applications assume confined conditions exist and the <br /> wells will be screened from approximately 50 to 60 feet below grade If unconfined <br /> conditions are encountered the screened intervals will extend from approximately 15 to 35 <br /> feet below grade An encroachment permit from the City of Stockton is pending for the <br /> monitoring well to be constructed within the former UST pit A copy of the encroachment <br /> permit will be forwarded to you when received <br /> • Health and Safety Plan A site-specific Health and Safety Plan is enclosed <br /> We hope this addendum is sufficient in addressing your concerns If you have any questions or <br /> comments please contact the undersigned at your convenience <br /> Respectfully, D GEp� <br /> Ground Zero Analysis, Inc <br /> GREGORY P. <br /> 7�'keST�^��I L <br /> No. 5O23 <br /> Gregory P Stahl, RG 5023 <br /> CA Certified Hydrogeologist No 264 `flg <br /> OF CAVF�R <br /> Attachments Figure 1 - Site Location Map <br /> Figure 2 - Site Plan with Proposed Monitoring Well Locations <br /> Enclosures Monitoring Well Permit Applications <br /> Check NoS S$R7 �aipz <br /> Site-specific Health and Safety Plan <br /> cc Mr Pat Riddle, Esq <br /> Mr Jerry Gregerson <br /> gnormu\addendum <br />