Laserfiche WebLink
Attachment B <br /> Drilling and Sampling Procedures <br />' The procedures that were used for drilling the borings and collecting soil samples are presented <br /> below <br />' + General safety procedures were reviewed with the field investigation staff and <br /> subcontractors prior to commencement of field activities <br />' . Monitoring well installation permits were obtained from SJCEHD <br /> Drilling Procedures <br />' • Two borings were advanced to a depth of 30 feet bgs and one deep boring was <br /> advanced to a depth of 80 feet bgs Borings were drilled using hollow stem auger <br />' equipment <br /> Augers and drilling equipment were washed prior to drilling each boring <br /> • A Shaw employee under the supervision of a California State-registered geologist <br /> recorded soil descriptions, sample type and depth, and related drilling information <br /> on a boring log <br /> Soil Sampling Procedures <br />' o Borings were sampled at 5 feet bgs and then in 5-foot increments until total depth <br /> in the 50-foot wells, and continuously until total depth from a depth of 15 feet in <br /> the 80-foot well <br /> The drilling and sampling equipment was washed in a detergent rinse, two clear <br /> water rinses, and a final deionized/distilled water rinse prior to drilling The <br /> equipment was air-dried or dried using paper towels <br /> • Soil samples were collected in six-inch long, stainless steel or brass sample tubes <br /> inserted inside the samplers The sample tubes were either pre-washed by the <br /> supplier or washed using a bristle brush with a detergent rinse followed by two <br /> clear water rinses and a final deionized/distilled water rinse The sample tubes <br />' were dry before use <br /> • Samplers were driven using a 140-pound hammer dropping approximately <br /> 30 inches The number of blows (blow count) required to advance the sampler <br /> 12 inches was recorded on the boring log <br /> a Following retrieval of the sampler, the first(lowest) sample tube was removed from <br /> the sampler, the ends covered with Teflon film, and capped with PVC end caps <br />' SHAW ENVIRONMENTAL,INC <br /> LISACRFPl\COMMONISACDP120031PRJ188018800391A 3AE DOC <br />' B-1 <br />