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Ms. Victoria McCartney <br /> S E C 0 R <br /> June 11, 2004 <br /> Page 4 <br /> • <br /> Subsurface Conditions <br /> Soil lithologies encountered during drilling of soil borings completed for monitoring well installation <br /> consisted predominately of sandy clay to clayey silt with minor amounts of silty sand. Clayey silt with <br /> medium-plasticity fines was encountered in boring MW-15D from 50.5 feet to 51 feet bgs. <br /> Groundwater was first encountered during drilling at approximately 24 feet to 25 feet bgs in each <br /> borehole. Boring logs and well construction details are included in Attachment 5. <br /> Soil Analytical Data <br /> Selected soil samples were analyzed for TPHg, TPHd, TPHmo, BTEX, MtBE, EtBE, TAME, TBA, <br /> DIPE, EDB, and 1,2-DCA. Soil analytical results and chain-of-custody documentation are presented <br /> in the laboratory analytical report in Attachment 6 and summarized below and in Table 2. <br /> Number of Detections Minimum Maximum <br /> Constituents Above the MDL of the 5 Detection In mg/kg Detection In mglkg <br /> Total Samples (Sample 1D) (Sample ID) <br /> TPHg 2 10(MW-15D-S-25) -49iMW-t6D-&-25K A l/J 15D-S-5 9 aD-S-59 <br /> TPHd 1 43(MW-15D-S-50) }..3 � <br /> 15.� -.S -1-9 <br /> Explanations: <br /> • MW-15D-S-25=Boring sample 15D at 25 feet bgs <br /> bgs=below ground surface <br /> MDL=Method detection limits / <br /> mg/kg=Milligrams per kilogram <br /> Note: <br /> TPHmo, BTEX, MtBE,TBA, ELBE, DIPE,TAME, EDB,and 1,2-DCA were reported below laboratory detection limits. <br /> Monitoring Well Development and Sampling <br /> On April 23, 2004, the newly-installed monitoring wells were developed and sampled by Gettler-Ryan <br /> Incorporated (G-R) in conjunction with routine quarterly groundwater monitoring and sampling. The <br /> groundwater samples were submitted to Lancaster for chemical analysis for TPHg, TPHd, TPHmo, <br /> BTEX, methanol, ethanol, MtBE, EtBE, TAME, TBA, DIPE, EDB, and 1,2-DCA. Preliminary <br /> monitoring well sampling results along with chain-of-custody documentation are presented in <br /> Attachment 7 and summarized below and in Table 3. Monitoring well sampling results will be <br /> presented in full in the second quarter 2004 groundwater and monitoring and sampling report. <br /> :1Chevron1905571REPORTS1200412004 Site Assessment. RevB.doc <br />