Laserfiche WebLink
In order to minimize the volume of soil excavated and yet adequately <br />' characterize the soil, EMCON Associates proposes excavating to a maxi- <br /> mum depth of 20 feet (approximately 10 feet below the base of the exca- <br /> vation). Laterally, EMCON Associates proposes excavating a maximum of <br /> 10 feet beyond the reported dimensions (6 feet by 9 feet) of the original <br /> tank excavation. The maximum proposed dimensions for the overexca- <br />' vating activities would therefore be 16 feet by 19 feet by 20 feet, and the <br /> total volume of soil excavated would be roughly 225 cubic yards. EMCON <br /> Associates proposes collecting four samples and compositing them into <br />' one sample for each 50 cubic yards of excavated soil. The composite soil <br /> samples from the stockpiled soil will be submitted to a state-certified labo- <br /> ratory for analysis of TPHD. <br /> j 3.2.1 Sample Analysis <br /> M <br /> Each confirmation soil sample will be submitted to astate-certified labo- <br /> ratory and analyzed for TPHD. The soil samples from the stockpiled soil <br />' will also be submitted to a state-certified laboratory, where they will be <br /> composited and analyzed for TPHD. <br /> I <br /> 3.3 Characterize Ground Water <br /> To assess the southern extent of ground-water impact, EMCOIiI Associ- <br /> ates proposes installing a ground-water monitoring well in this area shown <br /> on Drawing 1 . <br /> 1 3.3.9 Prefield Activities <br /> Before starting well installation activities, EMCON Associates will complete <br /> the following prefield activities: <br /> • obtain applicable drilling and well installation permits from <br /> the county <br /> • contract with an underground utility locating service to <br /> provide guidance in determining an unobstructed explor- <br /> atory soil boring location <br /> o arrange for necessary field materials and scheduling of a <br /> drill rig <br /> pjf\f92\f920201 a 7 Rev. 0 June 1, 1992 <br /> �— <br />