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f RAMAGE <br /> ENVIRONMENTAL Sacramento.Office' <br /> Post Office Box 869 , <br /> Rancho Murieta, CA 95683 . . <br /> Tel (916) 354-3250 <br /> March 27, 2001 <br /> Fax(916) 354-1786 <br /> Mr. Jeffrey Wong, R.E.H.S. i' <br /> San Joaquin County PHS/EHD <br /> 304 East Weber Avenue, Third Floor <br /> Post Office Box 388 <br /> Stockton, CA 95202 <br /> Re: Status Report and Work Plan Addendum <br /> Former Stefano's Gas Station Site, 1419 East Charter Way, Stockton, California <br /> f <br /> Dear Mr. Wong: <br /> On behalf of Wright Environmental Services, Inc. and the property owner of the above- <br /> referenced site, Ramage Environmental is pleased to submit this status report and workplan <br /> _ addendum to the San Joaquin County Public Health Sevices Environmental Health Division <br /> (PHS/EHD) and the Central Valley Regional Water Quality Control Board (RWQCB). The <br /> original scope of work for this phase of the project was outlined in Ramage Environmental's + <br /> Work Plan, dafed December 13, 1999. To date, only the on-site cone penetration test (CPT) <br /> boring has been completed. <br /> Results of CPT Drilling, Sampling—and Analysis <br /> On April 25, 2001, to evaluate the vertical extent of impacted soil and groundwater, Gregg <br /> Drilling and Testing, Inc. (Gregg), a state-licensed drilling contractor(C-57 #656407), <br /> advanced CPT borings and collected discrete soil and groundwater samples at one on-site <br /> location. Gregg's Presentation of Cone Penetration Test Data, dated May 5, 2000, is <br /> enclosed. <br /> The CPT location (CPT-1) is shown on the enclosed site map. At CPT-I, Gregg advanced a <br /> pair of soil borings with a truck-mounted CPT rig, with a down pressure capacity of <br /> approximately 25 tons. The first boring was advanced to a total depth of approximately 122 II <br /> feet below ground surface (bgs) with the CPT system, which records tip resistance, sleeve + <br /> friction, and dynamic pore pressure at five centimeter intervals. Pore pressure dissipation <br /> tests were recorded when suspected groundwater-bearing zones were encountered during <br /> drilling. The CPT plots, pore pressure dissipation plots, and interpretation output are <br /> included in Gregg's enclosed report. The second boring at CPT-I was dedicated to collect <br /> three soil samples and one discrete groundwater sample. <br /> L <br /> i <br />