Laserfiche WebLink
w t <br /> page 2, <br /> 8111 W. Eleventh Street <br /> The work plan refers to "two known potential off-site sources" but never identifies what <br /> these sources may be. PHS/EHD is not aware of any listed contaminated sites located <br /> south-southeast of the subject site. The map in the work plan is a site map only, <br /> therefore it obviously cannot show borings "placed at an assumed up-gradient position to <br /> the two potential off-site sources". To be up-gradient to a"potential off-site source the <br /> borings would have to be located off-site. <br /> The work plan states that bore hole depths are anticipated to be about 15-feet deep. <br /> Soil and groundwater contamination was documented at 17-feet below surface grade <br /> (bsg) during the August 8, 1988 tank removal. Therefore; in order to complete the <br /> required investigation of the vertical extent of the contaminant plume at this site, all soil <br /> borings for sample collection must extend.beyond 17-feef bsg. <br /> The work plan states that three monitoring wells will be installed on site, but the included <br /> map shows [possibly] four. <br /> The work plan as submitted is NOT approved. Please proceed with preparation of a <br /> detailed work plan to begin the investigation of the verticalin <br /> and lateral extent of the k <br /> documented petroleum hydrocarbon contamination at this site. Include n the work plan <br /> a description of how depth discrete soil and ground watersamples will be collected, a <br /> scaled map with the proposed boring locations clearly marked, a narrative justification <br /> for the proposed boring locations, and the previously requested well survey. The work <br /> plan is due on January 14, 2000. j <br /> f , <br /> If you have any questions call Lori Duncan at (209) 468-0337. <br /> I Donna Heran, REHS, Director <br /> Environmental Health Division <br /> 1 Lori Duncan, Senior REHS Margaret Lagorio, REHS <br /> Site Mitigation Unit IV Supervisor, Unit IV <br /> enclosure <br /> cc: Marty Hartzell, CVRWQCB (w/o enclosure) <br /> John Lynch, Wright Environmental Services Inc. `I <br />' t <br /> i <br /> 1 , <br />{ <br /> �s <br /> ' it <br />