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CalifornieZegional Water Quality Co .•ol Board i ^ <br /> u, <br /> Central Valley Region oA <br /> Katherine Hart, Chair ' <br /> 11020 Sun Center Drive,#200,Rancho Cordova,California 95670-6114 <br /> Matthe" Rodriquez (916)464-3291 • FAX(916)464-4645 Edmund G.Brown Jr. <br /> 5ecretary jor http://www.waterboards.ca.gov/centralvalley Governor <br /> b)n it onmenta/Protection <br /> RECEIVED <br /> David J. Vossler 25 August 2011 <br /> Winzler & Kelly r, a 2 6 2011 <br /> 3410 Industrial Boulevard, Suite 102 <br /> West Sacramento, CA 95691 ENVIPONMENTALHEALTH <br /> Pt-.RMIT/SERVICES <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 <br /> MW-5) and two soil vapor probes (SV-1 and SV-2) for a soil gas survey. The 2" diameter monitoring <br /> wells will be screened from 60' below ground surface (bgs) to 80' bgs. Two soil samples per boring <br /> advanced for MW-4 and MW-5 will be analyzed. Groundwater (quarterly monitoring for one year) and <br /> soil gas sample analyses will include total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> toluene, ethylbenzene, xylenes, and fuel oxygenates methyl tert butyl ether, tert butyl alcohol, di <br /> isopropyl ether, ethyl tert butyl ether, and tert amyl methyl ether by USEPA Method (Method) 8260B. <br /> Soil analyses will include the above groundwater and soil vapor constituents, but will also include an <br /> analyses option of TPHg by either Methods 8015M or 8260B, and will add total petroleum hydrocarbons <br /> as diesel by Method 8015M with silica gel cleanup, total recoverable hydrocarbons by SM5520F with <br /> silica gel cleanup, and total lead by Method 6010. SV- and SV-2 will be installed as temporary vapor <br /> sampling probes, screened at 5' 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(a-_)waterboards.ca.gov if you have <br /> 9 estions or comments. <br /> 65�tt�)1 <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 /> Z32ecvcled Paper <br />