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% <br /> 6. ✓ %%W01URS Greiner Woodward Clyde 252Q Venture Oaks <br /> 250 <br /> Sacramento,CA 95833 <br /> '-' Tel:916.929.2346 <br /> Fax:916.929.7263 <br /> t.. <br /> July 18,2000 <br /> .... Ms. Carol Oz <br /> San Joaquin County -Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95201-0388 <br /> +,. Reference: Letter Report for Site Investigation Activities at the <br /> California Highway Patrol Facility Located at <br /> 3330 North Ad Art Road in Stockton,California <br /> RESD Work Order No. CHP702 <br /> URSGWC Project No.41.03014214.03.03000 <br /> Dear Ms. Oz: <br /> URS Greiner Woodward Clyde, Inc. (URSGWC), on behalf of the State of California — Real Estate Services <br /> Division(RESD),is pleased to present this report summarizing the soil and groundwater investigation conducted <br /> at the California Highway Patrol(CHP)facility located at 3330 North Ad Art Road in Stockton,California(Site). <br /> This report has been prepared on behalf of the RESD under Contract No. 3014214. <br /> BACKGROUND <br /> A soil investigation was conducted by Alton Geosciences in March 1999 to comply with underground storage <br /> tank(UST) upgrading requirements. The investigation included drilling and sampling four soil borings. The <br /> borings were extended to approximately 25 feet below ground surface(bgs). One soil sample was collected at <br /> 25 feet bgs from each boring and submitted for laboratory analyses of total petroleum hydrocarbons as gasoline <br /> (TPH-G);benzene,toluene,ethylbenzene, and xylenes(BTEX);and methyl tertiary butyl ether(MTBE). The <br /> analytical results reported concentrations of MTBE in two soil samples(B2 and B4)at concentrations of 0.008 <br /> and 0.007 milligrams per kilogram. TPH-G and BTEX were not detected in any of the four samples. Based on <br /> these analytical results,the San Joaquin County Environmental Health Division(SJCEHD)requested that a soil <br /> and groundwater investigation be conducted at the Site. The workplan was submitted to SJCEHD on March 13, <br /> 2000 and approved by SJCEHD on March 31,2000. Fieldwork was delayed so the UST could be removed from <br /> the Site. The UST was removed by SEMCO on May 25, 2000. Analytical results for soil samples collected <br /> following the UST removal were non-detect. <br /> SITE INVESTIGATION ACTIVITIES <br /> Prior to drilling activities, URSGWC submitted a drilling permit application and fee to the SJCEHD. An <br /> approved permit was received for the drilling activities. The field activities were completed on June 20 and 21, <br /> 2000 with no significant deviations from the approved workplan. <br /> ti. <br /> rr <br /> I:114214103_Stockton\1071800.wpd p-ro)k6k �si� <br />