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URS Greiner Woodward_ Clyde 2520 Venture Oaks Way <br /> Suite 250 <br /> Sacramento,CA 95833 <br /> I <br /> September i4, 2000 <br /> SEP 2 2 2000 <br /> Ms. Carol Oz,R.E.H.S. <br /> LOP/Site Mitigation Unit ENVIRONMENT HEALTH <br /> San Joaquin County—Public Health Services PERMIT/SERVICES <br /> Environmental Health Division ! <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> 1, <br /> Reference: Letter Report for Environmental Services at the California Highway Patrol Facility <br /> Located at 385 West Grantline Road in Tracy, California <br /> RESD Work Order No. CHP702 <br /> URSGWC Project No.41-03014224-02 <br /> t <br /> Dear Ms. Oz: <br /> URS Greiner Woodward Clyde, Inc. (URSGWC) is pleased to present this report summarizing the soil and <br /> I <br /> r groundwater investigation conducted at the California Highway Patrol (CHP)facility located at 385 West Grantline <br /> Road in Tracy, California(Site). This report has been prepared on behalf of the State of California—Real Estate <br /> Services Division under Contract No. 3014214. 1 <br /> BACKGROUND <br /> A single-walled gasoline underground storage tank (UST) was located at the Site. A soil investigation was <br /> fi conducted by Alton Geosciences in March 1999 to comply with UST upgrading requirements. The investigation <br /> included drilling and sampling four sail borings. The borings were extended to approximately 25 feet below f <br /> ground surface(bgs). Groundwater was encountered at approximately five to seven feet bgs. Soil samples were <br /> collected at 10 and 25 feet bgs from each boring and submitted for laboratory analyses of total petroleum <br /> hydrocarbons as gasoline(TPH-G); benzene,toluene,ethylbenzene, and xylenes (BTEX). The samples collected <br /> at 25 feet bgs were also analyzed for methyl tertiary butyl ether (MTBE). The analytical results reported <br /> concentrations of MTBE in all four soil samples collected at 25 feet bgs at concentrations ranging from 0.004 to <br /> 0.093 milligrams per kilogram. TPH-G and BTEX were not detected in any of the samples collected at 10 or 25 j <br /> feet bgs. Based on these analytical results, the San Joaquin County Environmental Health Division (SJCEHD) <br /> requested that a soil and groundwater investigation be completed at the Site. The workplan was submitted to <br /> SJCEHD on March 13, 2000 and approved by SJCEHD on March 12, 2000. Fieldwork was delayed so the UST t <br /> could be removed from the Site. The UST was removed by SEMCO on May 18, 2000. Analytical results for soil <br /> samples collected 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 approved } <br /> permit was received for the drillingactivities. The field activities were completed on June 22 and 28, 2000 with <br /> P <br /> no significant deviations from the approved workplan. Underground Service Alert(USA)was notified a minimum <br /> of 48-hours prior to commencement of field activities. <br /> To assess the lateral extent of groundwater impact at the Site, URSGWC drilled and installed three groundwater <br /> monitoring wells. A figure showing the monitoring well locations is included as Attachment I. The wells were <br /> constructed in borings drilled using a truck-mounted, hollow stem auger(HSA)equipped drill rig. The borings <br /> a <br /> +' 11URS_SACIIWprocess114214102_Tracyltracy report-2.doc <br /> ' F <br />