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ENVIRONMENTAL HEALTH DEPARTMENT <br /> Donna K Her R.E.H.S.. SAN JOAQUIN COUNTY <br /> 2 Unit Su ervisors - <br /> Directforor Carl Bor 304 East Weber Avenue, Third Floor sman,R.E.H.S. <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,Wilson, <br /> S.,R.D.I. <br /> �. ... "P. <br /> Program Manager Douglas t Wilson,R.E.H.S. <br /> 4�/Fo'RN� g g Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie ogA. Manager Co R.E.H ..E .SProgram ManFax: (209)464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> PAUL SUPPLE GARY SCANNAVINO <br /> ATLANTIC RICHFIELD COMPANY SCANNAVINO PROPERTIES <br /> P O BOX 6549 5463 CHEROKEE LANE <br /> MORAGA CA 94570 STOCKTON CA 95215 <br /> RE: ARCO Station#595 Site Code: # 0707 <br /> 6100 N.Highway 99 <br /> Stockton CA 95212 <br /> WORK PLAN: "Work Plan for Additional Site Assessmene, <br /> DATED: Febtuary 15,2002 <br /> PREPARED BY: SECOR International Incorporated <br /> APPROVED: x-with conditions <br /> DISAPPROVED: <br /> ADDENDUM NEEDEE Submit : <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25299.37,subd(c)(3)1: <br /> 1. Installation of three shallow groundwater monitoring wells. Two of the wells will be located as sentry wells near <br /> the two closest off-site domestic wells,the third will be located north of MW-5. These wells will be screened from <br /> approximately 50-70 feet below surface grade. <br /> 2. Installation of three deep,discretely screened monitoring wells. Two will be located on-site;one will be located <br /> off-site,near MW-7. These wells will be screened from approximately 95-100 feet below surface grade. <br /> 3. Access agreements and City of Stockton Encroachment Permits will be obtained,as well as San Joaquin County <br /> well installation permits. <br /> 4. Soil samples for analysis will be collected during the drilling of the boreholes. Selected samples will be submitted for <br /> analysis of petroleum hydrocarbons,fuel oxygenates and 1,2-dichloroethane. <br /> CONBIENTS AND CONDITIONS: <br /> 1. Copies of all access agreements and encroachment peunits must be submitted to SJC/EHD before county drilling <br /> permits can be issued. <br /> 2. Application for encroachment permits and requests for access agreements must be submitted immediately,there is <br /> no need to wait until April 15,2002 as stated in the Project Schedule. <br /> 3. Fieldwork must be completed by May 3,2002. <br /> 4. A report of findings must be submitted to SJC/EHD within 60 days following the completion of the fieldwork. <br /> 5. The narrative of the work plan states that two shallow groundwater monitoring wells will be installed,but the map <br /> indicates that three are proposed. Per Rusty Benkosky,three shallow wells will be installed. <br /> 6. A gap of information exists down-gradient from the site,between MW-7 and MW-6. The possibility of placing a <br /> shallow well to fill this gap should be considered. <br /> DATED A 'a 5/6 2 BY <br /> Lori Duncan.Senior REHS =246) 8-0337 <br /> cc: Marty Hartzell,CVRWQCB <br /> Rusty Benkosky,SECOR <br />