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<br /> . ADelta JUL 21931
<br /> 13nviranrnantal ENVIRONMENTAL HEALTH
<br /> Consultants, Inc. PERN11 USERII;CFS
<br /> 3330 Data Drive,Suite 100
<br /> Rancho Cordova,CA 95670
<br /> 9161629-2085
<br /> FAX:916!638-8385
<br /> C G
<br /> June 28, 1991
<br /> �rr
<br /> Ms. Linda Turkatte
<br /> Department of Environmental Health F
<br /> San Joaquin County Public Health Services c
<br /> P.O.Box 2009
<br /> Stockton,California 95201
<br /> Subject: Monitoring Well Installation
<br /> Interstate Shell Station
<br /> 620 West Charter Way,Stockton,California
<br /> Delta Project filo.40-88-586
<br /> Dear Ms.Turkatte:
<br /> Delta Environmental Consultants,Inc.(Delta),has been authorized by Shell Oil Company to install one
<br /> ground water monitoring well in the vicinity of a Shell service station located at 620 West Charter Way,
<br /> Stockton,California(see enclosed figure). Background information regarding this project in contained
<br /> in Delta's Final Renrediarion Plan, dated January 29, 1991. Based on ground water analytical data
<br /> collected to date, the downgradient extent of petroleum hydrocarbon constituents in ground water is
<br /> undefined.
<br /> The purpose for installing the additional ground water monitoring well (MW-10) is to assist in
<br /> delineation of the downgradient extent of petroleum hydrocarbon constiutents in ground water. Depth
<br /> to water•in Lhe vicinity of the site is approximately 35 feet below grade. The proposed ground water
<br /> monitoring well will be installed to approximately 45 feet below grade. The soil boring will be advanced
<br /> using a hollow-stem auger drilling rig. Soil samples will be collected at 5-foot vertical intervals,and
<br /> field-analyzed for the presence of organic vapors with a phetoionization detector cr similar device.
<br /> Selected soil samples will be submitted to a state-certified laboratory for laboratory analysis of benvene,
<br /> toluene,ethylbenzene,and xylcn;s(BTEX)and total petroleum hydrocarbons(T'PH)as gasoline using
<br /> U.S.Environmental Protection Agency and California Department of Health Services approved methods.
<br /> Soil cuttings generated from the soil borings will be temporarily stored on site under visqueen, A soil
<br /> sample will be collected from the;stockpi&c and analyzed for BTEX and TPH as gasoline. The soil will
<br /> then be properly transported and disposed.
<br /> Practical Solutions to Environmogtal Concerns
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