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_1-1999 16:56 CAMBRIA INC. 1707 935 6649 F'.t7G er <br /> 7 - <br /> prc�3ct µ•. t <br /> CAMBRIA PT _Z/ <br /> July 13, 1999 <br /> Mr. Ron Rowe ENVIRONMENTAL HEALTH DIVISION <br /> San Joaquin County Public Health Services 304 E. Weber Ave.Third Floor <br /> P.O. Box 388 P. O. Box 388, SUock <br /> Ign CA 95201-0388 <br /> Stockton, California 95201 Approved <br /> Denied ❑ <br /> Re: Over-excavation Work Plan vl Conditions `cam 66-LO.-> <br /> Former Texaco Service Station <br /> 440 West Charter Way Date -7-L165 by. D,:o l2tk re � <br /> Stockton, California <br /> SAP Code 121258 1 � '� <br /> Incident #88870583 Ttt� usTr4- <br /> 1z� Gs.37u�s) <br /> © 2-- Cau'Tver PAS/OtD To Sc,klebwLa <br /> Dear Mr. Rowe: <br /> SITr: wo?v-. C4$ Nu,nR. AWPY" VYrrwlnwk•��, <br /> Cambria Environmental Technology. Inc. (Cambria) prepared this work plan on behalf of <br /> Equiva Services LLC to propose over-excavation activities associated with the tank, <br /> dispenser, and piping removal at the site referenced above. The scope of work presented in <br /> this work plan complies with San Joaquin County Public Health Services (SJCPHS) and <br /> Regional Water Quality Control Board (RWQCB) guidelines. <br /> SITE BACKGROUND <br /> Site Description: The site is currently a non-operating gasoline station located on the <br /> southeast corner of Lincoln Street and West Charter Way in a mixed commercial and <br /> residential area of Stockton, California (Plate 1). The site layout consists of a service station <br /> building, two generations of dispenser islands, and an underground storage tank (UST) <br /> complex (Plate 2). <br /> Previous Investigations: During October 1988, two dispensers were removed and soil <br /> impacted by petroleum hydrocarbons was observed beneath the eastern dispenser during <br /> construction preparation activities. Soil beneath this dispenser was excavated to an <br /> approximate depth of 15 feet below grade (fbg). Soil collected from the bottom of the <br /> Oakland. Ca excavation contained total petroleum hydrocarbons as gasoline (TPHg) at concentrations <br /> Sonoma. c a and benzene at concentrations ranging from <br /> ,,,.land. 08 ranging from 3 to 5.300 parts per million (ppm) <br /> s e a t t l e. w, not detected (ND) to 31 ppm. This investigation is described in the October 9, 1990 <br /> Environmental Assessment Status Report written by Groundwater Technology, Inc. (GTI) of <br /> Cambria West Sacramento, California. <br /> Enviromme.tal <br /> Technology,171G <br /> In May 1989, GTI drilled four vertical soil borings (SB-1 through SB-4) and one angle soil <br /> 77o Perkins Street boring (AB-3) onsite. During May 1989, February 1990, April 1990 and May 1990• GTI <br /> P.O.Boa 759 <br /> Sonoma.G 95476 <br /> TO(7vr)93S-1850 <br /> F"(707)935-"49 <br />