Laserfiche WebLink
10 METHODS AND PROCEDURES <br /> 1 1 Health and SafM Plan <br /> Field work performed by Delta and Delta's subcontractors at the site is conducted according to guidelines <br /> established in a Site Health and Safety Plan (SHSP) The SHSP is a document which describes the hazards <br /> ' that may be encountered in the field and specifies protective equipment, work procedures, and emergency <br /> information A copy of the SHSP is at the site and available for reference by appropriate parties during <br /> work at the site <br /> ' 1 2 Locating Under round Utilities <br /> Prior to commencement of work on-site, Delta researches the location of all underground utilities with the <br /> ' assistance of Underground Service Alert (USA) USA contacts the owners of the various utilities in the <br /> vicinity of the site to have the utility owners mark the locations of their underground utilities Work <br /> associated with the boring and monitoring well installation is preceded by manual hand auguring to a <br /> minimum depth of 5 feet below grade to avoid contact with underground utilities <br /> 13 Soil Sampling and Contamination Reduction <br /> Soil bonngs and soil sampling is performed under the direction of a Delta geologist The soil borings are <br /> advanced using a truck-mounted hollow-stern auger drill ng <br /> To reduce the chances of cross-contamination between boreholes, all downhole drilling equipment is steam- <br /> cleaned between each boring To reduce cross-contamination between samples, the split-barrel sampler is <br /> washed in a soap solution and double-rinsed between each sampling event <br /> 1 <br /> Soil sampling beyond 5 feet below surface grade is conducted in accordance with ASTM 2488-84 Using <br /> ' this procedure, a 2-inch outside-diameter split-barrel sampler or a 2-inch instde-diameter California-type <br /> sampler is driven into the soil by a 140-pound weight falling 30 inches After an initial set of 6 inches, the <br /> ' number of blows required to drive the sampler an additional 12 inches is known as penetration resistance or <br /> the "N" value The N value is used as an empirical measure of the relative density of cohesionless soils and <br /> ' the consistency of cohesive soils <br /> LRPOl8 809 <br />