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t <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JQA UIN COUNTY <br /> A <br /> eo<I R E H S Veit supervisors <br /> h , i Donna K Henan, <br /> Director 304 East Weber Avenue, TWrd Floor Carl Bargeman,R E H S <br /> • Al Olsen,R E N S Stockton, California 95202-2708 Mike Huggins,R E H S,R D I <br /> 04 ,P• Program Manager Douglas W Wilson,R h H S <br /> AL r=oR� Laurie A Cotulla,R E H S Telephone; (209) 468-3420 Margaret Lagorio,R E If S <br /> Program Manager Fax (209) 464-0138 Robert McClellan,R E H S <br /> Mark Barcellos,R E If S <br /> OCT 0 8 2003 <br /> KEN HILLIARD <br /> 7—ELEVEN INC <br /> PO BOX 711 <br /> DALLAS TX 75221-0711 <br /> 7 RE 7-Eleven Store#32262 Site l=ode 3#1505 <br /> 2360 West Grant Lune Road <br /> Tracy CA 95376 <br /> W0_9N PLAN Soil and GmundwaterAsses meat Work Plan Addrndum <br /> DATED. October 1,2003 <br /> PREPAREQ BY. SECOR International incorporated <br /> IR VE x <br /> P D <br /> A QDENT)TJ I NEEDED Submst by <br /> A-DE QUATF AND NECESSARY ELEMENTS OF THE WORK PLAN N&S 25299 37,5ubd(c)(3)] <br /> 1 Installation of one monitoring well to approximately 50 feet below surface grade(bsg) for investigation of the vertical <br /> extent of the petroleum hydrocarbon contamination at the site The boring will be continuously cored from surface <br /> to total depth A 15-inch diameter conductor casing will beset to approximately 30 feet bsg prior to drilling to total <br /> depth and setting the well casing Final placement of the 5-foot well screen will be detem=ed in the field,based on <br /> the lithology of the core samples <br /> 2 Soil and groundwater sample analyses performed as outlined in work plan addendum <br /> CONMIENTS AND CON=NS, <br /> 1 As the deep monitoring well is being set in unknown hydrogeologtcal conditions,the core soil samples <br /> should be evaluated in the field to verify the proper and effective placement of the conductor casing The <br /> conductor casing should bottom in an appropriate fine grained interval <br /> 2 Five shallow monitoring will be installed on site per the SJC/EHD approval letter dated August 22,2003 <br /> 3 As previously directed,site fieldwork and initiation of quarterly groundwater rnorutoring must be completed by <br /> November 14,2003 Wellmstallations are currently scheduled to take place October 14-16,2003 <br /> 4 A report of findings must be submitted to SJC/EHD within 60-days following completion of the fieldwork <br /> ow*-eo <br /> Nuel C Henderson,Jr,R G <br /> Lon Duncan,Senior REHS It M <br /> LOP/Site Mitigation Unit N _ LOP/Site Mitigation Unit IV <br /> By.---- ............... <br /> cc James Barton,CNrRWQCB <br /> Brian Carey,SECOR <br />