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California Fgional Water Quality Cool Board <br /> Central Valley Region <br /> Katherine Hart, Chair <br /> Arnold <br /> Linda S. Adams 11020 Sun Center Drive#200,Rancho Cordova,California 9567 � �� I�11 �I'c, c warzenegger <br /> Secretary for Phone(916)464-3291 •FAX(916)464-4645 Lam-,,t1�U E Governor <br /> Environmental http://www.waterboards.ca.gov/centralvalley <br /> Protection ��I(y �' L010 <br /> ENVIRONN"FNT4E, i2o10 <br /> Ernest P. Giannecchini PERN�I(IStRViCES <br /> Ernie's General Store <br /> 4407 Waterloo Road <br /> Stockton, CA 95215 <br /> DOCUMENTS REVIEW, ERNIE'S GENERAL STORE, 4407 WATERLOO ROAD EAST, STOCKTON, <br /> SAN JOAQUIN COUNTY <br /> I reviewed the Soil Vapor Intrusion Work Plan— June 2010 (Workplan) and the Quarterly Groundwater <br /> Monitoring Report— Second Quarter 2010 (Report), received 10 June 2010 from your consultant <br /> Advance Geo Environmental, Inc. The Workplan proposes installation by direct push technology and <br /> sampling of four temporary vapor wells (probes). The Report provides the results of groundwater <br /> monitoring conducted on 7 May 2010. <br /> The Workplan states three probes will be installed along the eastern property line near the tanks pit and <br /> boring CPT-2; and one probe will be installed near the southeast corner of the site building. All probes <br /> will be sampled for soil vapor using Summa® canisters, and analyzed by methods TO-3 for total <br /> petroleum hydrocarbons as gasoline (TPHg), and TO-15 for benzene, toluene, ethylbenzene, xylenes, <br /> methyl tert-butyl ether (MTBE), tertiary amyl methyl ether (TAME), tertiary butyl alcohol (TBA), <br /> 1, 2 —dichloroethane (1,2-DCA) , and the system leak detection compound, isopropyl alcohol. <br /> The Report states depth to groundwater varied from 67' to 68' below ground surface. Groundwater flow <br /> direction was towards the north-northeast at a gradient varying from 0.002 to 0.005 feet/foot. Maximum <br /> groundwater concentrations were MTBE, 9.7 micrograms per Liter (ug/L, MW-3) and 36 ug/L (MW-4) . <br /> TPHg and TAME were not detected this sampling event. The Report recommends suspension of <br /> sampling (semi-annual during the second and fourth quarters) pending the results of the soil vapor <br /> intrusion investigation, and temporary suspension of the startup of the soil vapor extraction (SVE) <br /> system. <br /> The Workplan is approved. Please provide a schedule for the fieldwork by 30 June 2010 by email. <br /> Groundwater sampling during the 4th quarter of 2010 is temporarily on hold, pending results of the soil <br /> vapor investigation, with a comparison to the San Francisco Bay Regional Board Environmental <br /> Screening Levels. The SVE system startup was previously placed on hold during our 13 May 2010 <br /> meeting, also pending results of the soil vapor investigation. If you have any questions, you can contact <br /> at (916) 464-4615 or I can be reached by e-mail at Lbartonwaterboards.ca.gov. <br /> av2e4 <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> M Lori Duncan, San Joaquin County Environmental Health Department, Stockton <br /> Arthur Deicke, Advanced GeoEnvironmental Inc., 837 Shaw Rd., Stockton 95215 <br /> California Environmental Protection Agency <br /> C5 Recycled Paper <br />