Laserfiche WebLink
NOW <br /> 't 41L /' <br /> APPENDIX <br /> FIELD PROCEDURES <br /> Soil Sampling <br /> Sal samples will be collected at five-foot maximum intervals during the drillingof each boring <br /> 9 <br /> using a modified California sampler containing two-inch diameter, six-inch-long brass tubes <br /> ' cleaned with trisodium phosphate Sample tubes will be sealed with aluminum foil, plastic <br /> caps and tape Samples will be screened in the field using olfactory observations and an <br /> organic vapor analyzer (OVA) All samples will be preserved on ice and selected samples will <br /> ' be submitted to a California-certified analytical laboratory for analysis The samples will be <br /> analyzed using EPA Method 8015-modified for total petroleum hydrocarbons (TPH) and EPA <br /> Method 8020 for benzene, toluene, xylene, and ethyl benzene (BTX&E) All work will be <br /> ' performed in accordance with current San Joaquin County Public Health Services and LUFT <br /> Manual guidelines Drilling equipment will be steam cleaned between borings, all soil borings <br /> will be backfilled with cement grout <br /> Monitoring Well Construction and Development <br /> ' Monitoring wells will be constructed using the same sal sampling procedures as described <br /> above for soil borings All contaminated soil generated during drilling and all ground water <br /> purged during well development and sampling will be stored in sealed 55-gallon drums until <br /> laboratory tests are completed We will then make provisions for the appropriate disposal of <br /> any contaminated soil and/or ground water <br /> The materials encountered during drilling will be logged by an experienced field geologist and <br /> all work will be performed under the direct supervision of a registered geologist <br /> The monitoring wells will be developed using a surge and bail technique repeated until the well <br /> water becomes relatively free of sediment Groundwater samples will be collected from the <br /> wells following a 24 hour stabilization period Water samples will be collected using a <br /> disposable bailer after three to five well volumes have been purged from the well and pH, <br /> temperature and conductivity readings have stabilized All samples will be placed on ice and <br /> submitted to a state certified laboratory for designated analyses <br />