Laserfiche WebLink
California to ional Water QualityControl Board . <br /> g <br /> Central Valley Region <br /> Katherine Hart,Chair <br /> 11020 Sun Center Drive,#200,Rancho Cordova,California 95670-6114 <br /> Matthew Rodriquez (916)464-3291 •FAX(916)464-4645 Edmund G.Brown Jr. <br /> Secretaryfor http://Nvww.waterboards.ca.gov/centralvalley Governor <br /> Environmental Protection <br /> David J. Vossler 25 August 2011 <br /> Winzler& Kelly <br /> 3410 Industrial Boulevard, Suite 102 <br /> West Sacramento, CA 95691 <br /> WORKPLAN APPROVAL, EAR ACCOUNT CASE#R09-123, BLUE STAR, <br /> 4040 EAST MAIN STREET, STOCKTON, SAN JOAQUIN COUNTY <br /> I reviewed Workplan for Subsurface Investigation (Workplan), received 22 August 2011 from Winzler& <br /> Kelly (W& K). The Workplan proposed installation of two groundwater monitoring wells (MW-4 and MW- <br /> 5) and two soil vapor probes (SV-1 and SV-2) for a soil gas survey. The 2"diameter monitoring wells will <br /> be screened from 60' below ground surface (bgs) to 80' bgs. Two soil samples per boring advanced for <br /> MW-4 and MW-5 will be analyzed. Groundwater(quarterly monitoring for one year) and soil gas sample <br /> analyses will include total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, <br /> xylenes, and fuel oxygenates methyl tert butyl ether, tert butyl alcohol, di isopropyl ether, ethyl tert butyl <br /> ether, and tert amyl methyl ether by USEPA Method (Method) 8260B. Soil analyses will include the <br /> above groundwater and soil vapor constituents, but will also include an analyses option of TPHg by <br /> either Methods 8015M or 8260B, and will add total petroleum hydrocarbons as diesel by Method 8015M <br /> with silica gel cleanup, total recoverable hydrocarbons by SM5520F with silica gel cleanup, and total lead <br /> by Method 6010. SVI and SV-2 will be installed as temporary vapor sampling probes, screened at 5' <br /> bgs, and located at the western extent of the tank pit near UST#1 <br /> (SV-1) and UST#2 (SV-2). Soil vapor will be collected in Summa canisters for analysis by Method <br /> TO-15. A report of the investigations will be submitted within 30 days of receipt of analytical data. The <br /> scope of work is consistent with the W& K cost proposal approved 1 March 2011. <br /> The Workplan is necessary and appropriate, and is conditionally approved with the following revisions: <br /> • Silica gel cleanup will not be performed as listed above, due to the inability to determine which polar <br /> constituents are removed (petroleum hydrocarbons vs. non-petroleum hydrocarbons) by the process. <br /> • Lead scavengers 1, 2-dichloroethane and ethylene dibromide will be added to Method 8260B. <br /> Please contact me by phone at (916) 464-4614 or by email at ibarton(aD-waterboards.ca.aov if you have <br /> questions or comments. <br /> /s/original signed by <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> cc: Adrienne Ellsaesser, San Joaquin County Environmental Health Department, Stockton <br /> Lily Lee, State Water Resources Control Board, UST Cleanup Fund <br /> Conrad Lewis, DGS, Real Estate Division, 707 3rd St., West Sacramento 95605 <br /> California Environmental Protection Agency <br /> C4 Recycled Paper <br />