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Ram <br /> MV <br /> ,xI, <br /> + <br /> ab <br /> �i <br /> 1 <br /> 3 <br /> 10 <br /> a y Chevron/Alrport <br /> February 1991 <br /> Three borings for the installation of groundwater-rnonhoring Weil,(II MW-3 <br /> MW MW-4)were drilled on site on Novamber 20 and 21,1990,and on December 3, 1990. The <br /> locations of these borings are shown on the Site Plan (Figure 2). The boring locations were selected <br /> primarily to determine the gradient and quality of the first saturated zone beneath the site. Each baring <br /> was drilled using a truck-mounted rotary drill rig with 8.5-inch ou'�srde-diameter(O.D.),hollow-stem <br /> t a Groundwater Technology field geoiaglst,who maintained a <br /> ,._. ��igers. grilling was supervised by , <br /> continuous log of the materials encountered In accordance with the eUUn�e Unified lass logs are�ltion System •� <br /> and selected samples for possible WxxaUXY analYssc. Copes o <br /> Appendrx R. <br /> Soil samples were collected from each borehole at approximately 5-foot Intervals below surface <br /> bras;tubes. The tubes were <br /> grade. These samples were collected in 2-ii�iameter by 6-Inch-long <br /> sealsd with aluminum toll.capped,and sealed with plastic tape. Thoy were retained for pass <br /> ible <br /> laboratory analyses. Copies of all eppiicaole Groundwater Technology SL <br /> �d operating Procedures <br /> (SOPS)are included In Appendix C. <br /> s <br /> J ; <br /> ,^ Soil samples were screened In the field for volatile hydrocarbon vapors using a photo-lonlzatlon r <br /> All <br /> detector(PID). Photo ionization readings are listed ot h�rom t�helogs <br /> vados edlatelyiolrerlying readings <br /> were below detection levels. A soil sample was se ee <br /> 'e the saturated zone. Retained samples were labeled,stored on ice in an insulated cooler,and <br /> artinez, <br /> transported under Chale-ot-Custody <br /> Manifest to Lhe Superior Analytical Laboratory In MCalifornia,a State of California Certified Laboratory,for analysis. Samples were analyzed for the presence offlfo4TIX <br /> and for TPH-as-gasoline using modified U.S.Environmental Protection Agency(EPA)Methods <br /> 5030/8020/8015. Copies of the laboratory reports and Chan-of-Cu"Y Manifest documents are <br /> Included In Appendix D. <br /> ' Monitoring wells were Installed In the three soil borings• On <br /> �~ November 20-21,19 ,monitoring wells MW-2 and MW-3 were installed,and on December 3, 1A90, <br /> 90 <br /> ' monwing well II was Installed. The wells were constructed of 2-inch-diameter,0.020-Inch machine- <br /> lotted Schedule 40 P <br /> sVC well screen and blank casing. A well filter pack consisting of Lapis Luster <br /> No.2 sand was placed In the annular space of each well from the bottom of the well boring up to 2-feet <br /> ' <br /> E11L-JL <br /> 1 _ GROUNDIVATER ' <br /> .E TECHNOLOGY.INC. <br /> , a <br /> >d <br />