Laserfiche WebLink
R. M. B . Garage (Erardi Ventures) Paget of 2 <br /> 715 North Hunter Street February 19, 2015 <br /> Stockton, California 95269 <br /> Analyze groundwater samples from all wells for total petroleum hydrocarbons (TPH) as <br /> gasoline (TPH-g) ; benzene, toluene, ethylbenzene and total xylenes (BTEX) ; tertiary- <br /> amyl methyl ether (TAME) and 1 , 2-dichloroethane ( 1 ,2-DCA) ; include the analyses of <br /> TPH-diesel (TPH-d) and naphthalene for groundwater samples collected from MWA <br /> through MW-5, MWA 0 , MWA 1 , MW-14, MW-15 and DPE-1 . <br /> The EHD concurs with the recommendation by AGE to collect grab groundwater samples at <br /> discrete depths northeast of MW-13 and MW-14 to delineate the petroleum hydrocarbon plume <br /> down-gradient of the source area. In addition ; the EHD believes that additional site assessment <br /> is needed east of MW-15 which has high concentrations of contaminants of concern in <br /> groundwater. Submit a work plan to the EHD by 01 May 2015 that addresses the vertical and <br /> lateral delineation of petroleum hydrocarbon contamination at this site. <br /> The EHD also approves the submittal of a pilot study work plan to assess the effects of injecting <br /> ISCO. Submit a work plan to the EHD by 01 June 2015. <br /> Please correct the total depth of monitoring well MW-15 to sixty feet below surface grade in the <br /> table titled Summary of Monitoring Well Details that is submitted in the semi-annual monitoring <br /> reports for this site. Also , based on the findings submitted in Dual Phase Extraction <br /> Remediation Report — Second Quarter 2014, continue operation of the dual-phase extraction <br /> system using remediation wells DPE-1 , MWA , MW-2 and MW-3 as appropriate based on <br /> current analytical data . The latest remediation report contains analytical results from samples <br /> collected through June 2014; please submit reports in a timely manner so that the EHD can <br /> evaluate the remedial effectiveness of the dual phase extraction system . <br /> Please contact Vicki McCartney at (209) 468-9852 or by email at vmccartney(a).sicehd. com if <br /> you have any questions . <br /> Sincerely, <br /> V��Z�C�Ia�, %����' fl.- / ` �• , rr�- LGA ��G� _.. . <br /> Victoria L. McCartney, REHS Nuel C. Henderson , Jr. , PG <br /> Senior Registered Environmental Health pecialist Engineering Geologist <br /> c: Mr. Timothy Cuellar, Advanced Geo Environmental, Inc. , 837 Shaw Road , Stockton , <br /> California 95215 <br /> Mr. James L. L. Barton , PG , California Regional Water Quality Control Board Central <br /> Valley Region , 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />