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i <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> U ` " SAN JOAQUIN COUNTY <br /> o <br /> Donna K Heran, R.E.H.S. Chit Supervisors <br /> 304 East Weber Avenue, Third Floor <br /> m :i Director Carl Borgman, R.E.H.S . <br /> Laurie A. Cotulla, R.G.H.S. Stockton , California 95202-2708 Mike Huggins, R.E.H. S . , R.D.I . <br /> Program Manager Douglas W. Wilson, R.E.H.S . <br /> '° CLdoaN. Telephone : (209) 468- 3420 MargaretLagorio, R.E. H .S . <br /> 209 <br /> Fax : <br /> ( ) 464-0138 <br /> Robert McCleBon, R.E. H . S . <br /> Website: www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S . <br /> PAUL SUPPLE <br /> ATLANTIC RICHFIELD COMPANY April 21 , 2006 <br /> PO BOX 6549 <br /> MORAGA CA 94570 <br /> RE : Arco Station #2130 Site Code 1094 <br /> 7906 N . EI Dorado St, RO#: 035 <br /> Stockton , CA. 95210 <br /> WORKPLAN : Work Plan for Additional Assessment <br /> DATED : April 14, 2006 <br /> PREPARED BY: Secor International - Rusty Benkosky, P. E . <br /> STATUS : APPROVED with conditions noted below. <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN [Health & Safety <br /> Code (H & S) Section 25296 . 10(c)(3)1 : <br /> • Install MW-11 through MWA3 onsite as replacement monitoring wells for <br /> existing `drowned' screened monitoring wells and, <br /> • Collect and analyze a minimum of two soil samples from each boring for <br /> TPHg, TPHd, BTEX, and fuel oxygenates by 8260B and, <br /> • Develop, survey in , and add new wells to existing quarterly monitoring. <br /> • Submit a report of findings to EHD. <br /> COMMENTS AND CONDITIONS : <br /> • Include 1 ,2-DCA, lead, and EDB laboratory analyses for selected soil <br /> samples and, <br /> • Report of findings to be in format of an updated Site Conceptual Model <br /> (SCM). Refer to EHD' <br /> s October 3, 2003 comment letter for items of concern <br /> and items that were missing in URS's SCM submittal and include them in <br /> the SCM update due at EHD within 60-days of the end of the field work. <br /> • Submit EHD Well Permit Application form and $89 fee immediately. <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN H& ection 25296. 1 0 c 3 : <br /> • none. <br /> j BY `y66f<9 <br /> Michael Infurna , RER8. (209) 468-3454 <br /> c: CVRWQCB — James L. Barton , Sacramento . <br /> c: SWRCB — CUF — Mark Owens , Sacramento, <br /> j c: Secor — Rusty Benkosky, 3017 Kilgore Rd , # 100 , Rancho Cordova . 95670 <br /> j [X] electronically mailed to consultant on : <br /> I <br /> I <br />