Laserfiche WebLink
Manteca Unified School District <br /> Soil&Groundwater Investigation eport 41 <br /> Page 5 <br /> 3-feet thick was placed in the annular space above the filter pack followed by a <br /> cement grout to the surface <br /> 2.3 Well Development and Sampling <br /> The wells were developed until the water removed was no longer turbid The <br /> water produced during well development was containerized and left on-site in 55- <br /> gallon drums for disposal as hazardous waste if deemed necessary upon receipt of <br /> laboratory results Disposal is the responsibility of the client unless other <br /> arrangements are made The wells were allowed to stabilize for twenty-four (24) <br /> ' hours prior development and prior to sampling <br /> All soil and groundwater samples were properly labeled with date collected, <br /> ' project number, sample coordinator, and sample identification Field records <br /> document the above information and other significant data, such as names of on- <br /> site personnel, sampling methods, date and time of sampling, the number of well <br /> volumes removed before sampling, preservatives added, and any filtration <br /> performed on samples <br /> ' The samples were refrigerated immediately for delivery to the laboratory and <br /> under no circumstances were opened by anyone other than laboratory personnel <br /> Chain of Custody records were maintained at all times <br /> 2.4 Soil Sampling <br /> ' All soil sampling equipment was thoroughly steam-cleaned before and between <br /> sampling to prevent cross contamination Relatively undisturbed soil samples <br /> were taken at intervals of not more than 5 feet in order to evaluate the subsurface <br /> materials <br /> For augured borings the soil samples were taken using a California Modified Split <br /> Spoon sampler with brass liners A 140-pound hammer repeatedly falling 30 <br /> inches drove the sampler The blow counts necessary to drive the sampler were <br /> recorded for each 6-inch interval to help evaluate the consistencies of the <br /> materials <br /> The laboratory samples did not have headspace and were immediately sealed in <br /> their liners using aluminum foil lined plastic caps The remaining sample was <br /> ' removed from its liner to be used as an aide to the on-site geologist in logging the <br /> material at that depth <br /> ' Soil samples were delivered under chain of custody to an analytical laboratory <br /> licensed by the State of California for hazardous materials work The samples <br />