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f <br /> A M B R I A Ms Vicki McCartney <br /> April 6, 200b <br /> G5 A <br /> approximate depth near the current USTs, near the subject property's northeast corner, on the <br /> rj� Best Western property, and on the Delta Market property <br /> Boring CPT-5 contained elevated TPHg and BTEX concentrations at 90 fbg Groundwater <br /> samples from CPT-17 at 90 fbg dad not contain TPHg or BTEX Shell recommends installing a <br /> well near the current USTs screened at this depth to further assess the vertical extent of TPHg and <br /> BTEX on site <br /> r <br /> .4y1'1,bU Groundwater samples from borings CPT-3, CPT-4, CPT-12, CPT-13, CPT-16, and CPT-17 <br /> contained 1,2-DCA up to�04'ppb With the exception of 2 4 ppb in CPT-16 at 25 fbg, 1,2-DCA <br /> has not been detected on site above 66 fbg To further assess the source of the 1,2-DCA detected <br /> in deeper groundwater, Shell recommends advancing an upgradient boring on site and analyzing <br /> soil and groundwater samples for 1,2-DCA /P5 0 ? <br /> Cambria presents the proposed well and bonng locations on Figure 2 Note that the well screen <br /> depths discussed above are approximate and based on current and previous CPT investigation <br /> results Actual well screen depths will be determined in the field, based upon soil types observed <br /> dunng drilling If SJCEHD concurs with these recommendations, Shell will submit a work plan <br /> further detailing the proposed activities <br /> • <br /> 8 <br />