Laserfiche WebLink
Taber Consultants <br /> 3911 West Capitol Avenue <br /> West Sacramento,CA 95691-2116 <br /> Since 1954 (916)371-1690 <br /> (707)575-1568 <br /> Fax(916)371-7265 <br /> www.taberconsultants.com <br /> September 15, 2009 <br /> `Ms. Margaret Lagorio <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95205 <br /> Project#051111 <br /> Subject: Site Investigation and No Further-Action Reguest Addendum <br /> R&L Diesel Services, Inc. <br /> 2417 West Lane, Stockton, California 9 205 <br /> As requested, this addendum to the Site Invest gation and No FurtherAction Report <br /> prepared by Taber Consultants on September 9, 2009, provides further information on soil <br /> vapor intrusion potential at the site, corrected mass balance calculations and upload of relevant <br /> site information to the State Water Resources Control Board Geotracker system. An error was <br /> made in the mass balance provided in the above refer nced report and the corrected <br /> calculations are provided herein. <br /> Soil Vapor Intrusion Potential <br /> Although there is a significant remaining conte tration and mass of TPH-D remaining in <br /> soil at the site, this mass is not expected to pose a vap r intrusion risk due to the concrete slab <br /> floors that were encountered at two different depths du ing subsurface investigation work at the <br /> site. These two concrete floors provide caps that effec ively restrict upward migration of soil <br /> vapors from the remaining impacted soil at the site. In addition, the anticipated use of the shop <br /> area for diesel engine repair work is expected to generate vapor of diesel range hydrocarbons <br /> and related constituents in excess of anything that could be expected to be present as a result <br /> of soil vapors from the remaining mass in the subsurface at the site. Therefore, vapor intrusion <br /> does not appear to be an unacceptable risk factor in dE termining a no further action status for <br /> this site. <br /> Taber Consultants <br /> Engineers and Geologists <br />