Laserfiche WebLink
Manna Pro <br /> Page 2 <br /> 2. The vertical extent of soil,and groundwater contamination in the release area must be <br /> defined. Once the vertical extent is determined, evaluation of the;horizontai extent <br /> can be made. Your consultant indicated he had encountered heaving sands at a site <br /> close to this site and was,concerned with encountering them at this site. Mud rotary <br /> drilling and hollow stem`auger drilling with installation of a conductor casing were <br /> discussed for use when drilling in heaving sands. The use of the"Simuiprobe"for <br /> II' discrete sampling every;20 feet was also discussed. <br /> 3. Quarterly groundwater monitoring with collection and analysis of water samples must <br /> be performed. Water samples should be analyzed for TPH as gasoline, TPH as diesel <br /> and BTEX using P a proprGte EPA methods. They should also be analyzed for <br /> oxygenates (MTBE, DIPS, ETBE, TBA, TAME) using EPA method 8260. MW3 is to <br /> be added to the wells currently being sampled quarterly. MW4 is to be sampled at <br /> least annually. Water samples from MW1 and MW3 are to be analyzed for 12. DCA. <br /> 4. Site conditions have changed since the submittal of the CAP in 1994. Two remedial <br /> alternatives must be studied and the most cost effective remediation method <br /> determined. Air sparginIg'with vapor extraction has been used successfully at other <br />'F sites in San Joaquin County and is considered a viable remedial alternative to be <br /> studied at this site. Installation of vapor extraction and air sparge wells,-for <br /> conducting tests of these'methods, at the same time as vertical delineation is <br /> performed was recomrriended by PHSIEHD. <br /> 5. All corrective action proposals should be submitted to the California State Water <br /> Resources Control Board Cleanup Fund for preapproval of corrective action costs. <br /> Please submit a work plan, well permit application and $89 permit fee to PHSIEHD by August 30, <br /> 1999. <br /> If you have any further questions_ regarding this matter, please contact Harlin Knoll at(209) 468- <br /> 3442. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> IYLX <br /> Harlin Knoll, Senior REHS Margare aggro, 1E11S <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region—Mark List <br /> c: Geo-phase <br /> C'. Tony Palmer <br />