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�-IkL-21-1999 16 56 CAMBRIA INC 7 17077 935 6649 P 02/07 <br /> x P }rG 3ct No. <br /> C A Ail B R # A RPT <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 4 Box 388, Stockt CA 95201-0388 <br /> Stockton, California 9520I Approved <br /> Denied ❑ <br /> Re Over-excavation Work Plan wI Conditions Ib��.ou►> <br /> Former Texaco Service Station <br /> 440 West Charter Way Date 1-LZ5j by <br /> Stockton, California <br /> SAP Code 121258 1 • <br /> Incident #88870583 7&CIj U%r* <br /> Z C.ow"lite Patslo+b To se i ebiat.e3' <br /> Dear Mr Rowe 5 ITE_ W09-V- (46 A Du Pvocr <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 /> 4 <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 /> Sue 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 arca of Stockton, California (Plate 1) The site layout consists of a service station <br /> budding, two generations of dispenser islands, and an underground storage tank (UST) <br /> complex (Plate 2) <br /> Previous Anvestigatrons• During October 1988, two dispensers were removed and Solt <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 c A excavation contained total petroleum hydrocarbons as gasoline (TPHg) at concentrations <br /> Sonoma CA <br /> Portlarod OR ranging from 3 to 5,300 parts per million (ppm) and benzene at concentrations ranging from <br /> Seattle WA 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 /> Cambna West Sacramento, California <br /> Envtromts nW <br /> 7scknaiogy.Inc <br /> In May 1989, GTI drilled four vertical soil borings (SB-1 through S13-4) and one angle soil <br /> :7o Perkins Street <br /> P o Bex!S9 boring (AB-3) onsite During May 1989, February 1930, April 1990 'and May 1990, GTI <br /> Son=a CA 95&76 <br /> '93S't8io <br /> 7)g35"�;9 <br />