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clay lon <br /> 10 INTRODUCTION <br /> Clayton En%iionnlLntal C'omultanis, Inti , Nvas retainLd by OiLh,lyd Supply <br /> Hardware (OSH) to in%tall three monitoring Wills to sample Iiia .111,11yze boil and <br /> groundwater at the northeast corner of MdLArthur Diive ain Grant Lliit Road in <br /> Tracy, California (Figure 1) <br /> This work was authorized by Mr Mice UToi.rette, director of real estate for <br /> OSH, on February 25, 1990, by approving Clayton's Proposal No 90-13-041 and its <br /> accompanying terms and conditions Clayton c.ontmenLed field mork on March <br /> 28, 1990, after obtaining the permits to install the monitoring welly from San <br /> Joaquin County Public Health Services (SJCPHS) <br /> 2.0 BACXGROUND <br /> Clayton was contracted by OSH to January 1990 to conduct a Phase I <br /> environmental assessment of the subject site The assessment revealed that a <br /> gasoline underground storage tank (UST) was removed in 1985 Kapreahan <br /> Engineenng, Inc (KEI) had been retained by the owner, Mr Jim Joseph, to install <br /> a groundwater momtoring well The well was installed to a depth of 25 feet A <br /> water sample from the well was analyzed for total petroleum hydrocarbons (TPH) <br /> as gasoline and the volatile hydrocarbons, benzene, toluene, ethylbenzene, and <br /> xylene (BTEX) All of these constituents were below detectable limits Clayton <br /> could not find the well during the assessment We were later tntormed that it had <br /> been abandoned Appendix A contains a copy of K.EI's report <br /> Clayton conducted this investigation to establish a baseline environmental <br /> condition of the property prior to its transfer hom Mr Joseph to OSH The wells <br /> were located near three corners of the property, as shown in Figure 2 <br /> 30 DIE ID INVG Ti0 <br /> Clr yton commenced field activities for the installation and sampling of the three <br /> monitoring wells at the site on March 28, 1990 All work was performed in <br /> accordance with Clayton's Di-ilhn Wel! Construction and Sam Ian Protocols <br /> included in Appendix B The following subsections describe the completion of <br /> each of the tasks outlined in Clayton's work proposal dated February 20, 1990 <br /> 3.1 SOIL-BOREHOLE INS'I AL LATiON/MONITORING WELL <br /> CONSTRUCTION <br /> Before drilling began, a well construction application and work plan were filed <br /> with San Joaquin County Public Health Services, Environmental Health Division <br /> A copy of this application is included in Appendix C Drilling at the subject site <br /> was conducted on March 28, 1990 DATUM Exploration, Inc was contracted to <br /> install the shallow groundwater wells under the dirrc.t stipervmon of Clayton <br /> personnel The norehole�, were installed using an 8-inch hollow stem auger from a <br /> mobile; truck-mounted drilling rig <br />