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PUBLIC HEALTH SERVIC?s ,,Y a o <br /> SAN JOAQUIN COUNTY <br /> • ENVIRONMENTAL HEALTH DIVISION A _r ` <br /> Karen Furst, M D., M.P H , Health Officer o P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 9`�F:0 <br /> 209/468-3420 <br /> PAUL SUPPLE SEP 0 7 2000 <br /> ARCO PRODUCTS COMP <br /> PO BOX 6549 <br /> MORAGA CA 94570 <br /> RE Arco#6020 SITE CODE 14551 <br /> 1711 E Yosemite A%e (Hwy 120) RO#000665 <br /> Manteca,CA-,95336 <br /> San Joaquin CounryPubhc Health Services,Environmental Health Division(PHS-EHD) has reviewed the August <br /> 25,2000"Over-excavation and Sod Sampling Report Associated with the Replacement of Underground Storage <br /> Tanks,Product DehveryLmes,and Dispensers"submitted on August 28,2000 by The IT Group and the August 16, <br /> 2000"Work Plan for Addttional Site Assessment" submitted by The IT Group on August 17,2000 and has the <br /> following comments <br /> The report of over-excavation during the April 1999 UST replacement activities concluded that residual petroleum <br /> contamination remains in the dispenser areas Sod contamination found at 7 feet below the ground surface(bgs) at <br /> • sampling areas"D-3","D-6",and"D-7" must be laterally and vertically defined Groundwater samples from directly <br /> below the former USTs have not been collected so the condition of the groundwater below the former UST's is not <br /> known <br /> The work plan proposed to install four(4)groundwater morutonng wells onsite The closest proposed monitoring <br /> well installation is about forty(40)feet from the UST pit and dispenser areas of concern The work plan states that <br /> "dx purprae cfthe papa&uork is to the lateral and wdwal ec we r 9Fpetn&im hyiq a�in sort and gnznrkpaw berxa&b <br /> the sue" Placement of monitoring wells font'feet from the areas of concern will provide some information,but <br /> additional borings and subsurface investigation in the iainediate area of the impacted dispenser areas and directly <br /> below the UST pit is required Groundwater monitoring wells are to be placed as close to the area where previously <br /> detected sod contamination remains Unfortunately the recommendation by PHS-EHD staff to place conductor <br /> casings in the UST pit bmiem the tanks for future safe drilling was ignored and now slant borings may be the only <br /> solution <br /> The work plan is not approved as submitted A revtsion is required that addresses the above noted concerns In <br /> addition,a well permit application and application fee(S89) is to be submitted with the revised work plan due at <br /> PHS-EHD by September 27,2000 <br /> You should address yourconcems,submittals,and anyquestions you mayhave to Michael Infurna,Senior RENS <br /> You may contact him by phone at(209)468-3454 <br /> Donna Heran,RENS,Director <br /> Environmental Health Division <br /> Michael J nfurna Jr,Semor HS Ma baret�ggno. S <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c SWRCB-CLJF—Wenndyn Fua,Sacramento <br /> C CVRWQCB—Marty Hartzell,Sacramento <br /> c Secor Consulting—Rusty Benkosky,3017 Kilgore Rd,# 100,Rancho Cordova,95t579 so 8 <br /> A Division of San Joaquin County Health Care Services f1 U I V <br />