Laserfiche WebLink
r • • <br /> A <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> p p4u ly,.C Donna Heran,REHS <br /> 600 East Main Street <br /> Wi FL—nii < Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> • c ., ;P.• Website: wwW.sjgov.org/ehd Kasey Foley,REHS <br /> 9�/FORS Phone: (209)468-3420 <br /> Fax: (209)464.0138 <br /> June 17, 2010 <br /> Ken Gillies <br /> Gillies Trucking <br /> P O BOX 8303 <br /> Stockton CA 95208 <br /> Subject: Gillies Trucking <br /> 3931 Newton Road <br /> Stockton, CA 95205 <br /> The San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Workplan for Soil Vapor Extraction Test (WP), prepared in April 2010 by your <br /> consultant, Stephen Muir of Stephen G. Muir, Consulting Geologist and Geophysicist <br /> (Muir). <br /> The scope of work for the 5-day soil vapor extraction (SVE) pilot test includes <br /> temporarily connecting monitoring well GT-10 to a portable 2-horsepower blower to <br /> extract soil vapor and treat the entrained hydrocarbon vapor, utilizing four 200-pound <br /> canisters of granular activated carbon. It is proposed to collect extracted soil gas <br /> samples, utilizing Tedlar bags, from the influent air stream at the beginning of the SVE <br /> test and at 12, 24, 48 and 120 hours after initiation of the test. <br /> The samples are to be analyzed by method TO-15 for benzene, toluene, ethylbenzene, <br /> total xylenes (BTEX) and total petroleum hydrocarbons quantified as gasoline (TPHg). It <br /> is also proposed to collect one soil gas sample in a 6-Liter Summa canister at the end of <br /> the SVE test to analyze by method TO-15 for a full scan report. <br /> Ambient air hydrocarbons will be monitored by Muir utilizing a photo-ionization detector <br /> (PID) at 12-hour intervals during the pilot test, and Muir proposes to follow leak detection <br /> protocols established by the Department of Toxic Substances Control (DTSC) included <br /> as Appendix 3 in the WP. <br /> The EHD approves the basic work plan as necessary and adequate [H&S 25296.10 <br /> (c)(3)] but does not approve collecting the Summa canister sample for the full-scan <br /> TO-15 analysis, but will reconsider this if additional technical justification is provided to <br /> the EHD. The EHD believes that the data provided by PID readings and laboratory <br /> analysis for TPHg and BTEX in the samples collected in Tedlar bags will be adequate to <br /> evaluate the effectiveness of SVE for remediatiQn of hydrocarbon-impacted vadose zone <br /> soil. The EHD does not understand the need to follow leak test protocols for collecting <br /> samples from the influent soil gas stream. Please note that the TO-15 hold time for <br /> samples collected in Tedlar bags is 3 days. Implement the work plan within 60 days of <br /> SVE Pilot Test WP Approval Letter 0610 <br />