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4 <br /> U <br /> I <br /> March 16, 2001 .; <br /> r <br /> Ms. Margaret Lagorio, Supervising R.E.H.S. <br /> Unit IV/LOP <br /> San Joaquin County—Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> 4 <br /> Reference: Revisions to Workplan for Site Investigation at the <br /> California Highway Patrol Facility <br /> 385 West Grantline Road in Tracy, California <br /> RESD Work Order No. CHP702 { <br /> URS Project No. 41-03014214-02-05000 <br /> Dear Ms. Lagorio: <br /> URS Greiner Woodward Clyde, Inc. (URSGWC) is submitting this letter on behalf of the Real Estate <br /> Services Division(RESD)for the soil and groundwater investigation at the California Highway Patrol facility <br /> located at 385 West Grantline Road in Tracy,California(Site). The purpose of the letter into document the <br /> revisions to the workplan submitted by URSGWC on behalf of RESD on December 7,2000. The revisions <br /> are in response to your letter dated January 25,2001. The following shows the portionof your comments <br /> in the January 25, 2001 letter(in bold text)and URSGWC's'response to fulfill the request. <br /> URS has proposed installation of two additional monitoring wells north and northeast of MW1 to <br /> investigate the.lateral extent of the contamination. PHSIEHD requires that the vertical extent ; <br /> of the contamination be investigated as well. At least one boring/monitoring well must be installed <br /> downgradient of the former UST location and the investigation must continue below the 25 feet <br /> depth of confirmed sol contamination. A discretely screened well to define the vertical extent of M <br /> the contamination should be installed. <br /> URSGWC is proposing the installation of one boring to 30 feet below ground surface(bgs). The location <br /> of the boring is shown on the attached Figure 1. The boring will be drilled with 8-inch diameter hollow <br /> stem augers. During drilling,soil samples will be collected every five feet beginning at five feet bgs and <br /> continuing to 30 feet bgs. Two soil samples will be submitted to Curtis&Tompkins,Limited(Curtis& <br /> Tompkins), a California State Certified Laboratory, for analysis of TPH-G by EPA method 8015 <br /> modified;and BT'EX,MTBE,tert-butyl alcohol(TBA),.di-isopropyl ether(D1PE),ethyl tert-butyl ether <br /> (ETB), and tert-amyl methyl ether(TAME) by EPA method 8260 <br /> 5 <br /> R <br /> URS Corporation <br /> 2870 Gateway Oaks Drive, Suite 300 <br /> Sacramento,CA 95833 <br /> Tel:916.679.2200 <br /> Fax: 916.679.2900llsacdata2lWprocess114214102_Tracy1L031601.wpd <br />