Laserfiche WebLink
Morita Brothers Service Station <br /> 1 $ July 16, 1992 <br /> i <br /> drilling augers will be steam cleaned between borings, also to reduce the possibility <br />' of cross-contamination Drill cuttings, and soil sample spoils will be contained in <br /> D O T approved 55 gallon drums awaiting confirmation from laboratory analysis as to <br />' whether the contents are hazardous Disposal of any contaminated soil is the <br /> responsibility of the facility operator <br />' A field <br /> or engineer geologist will be on-site to log the borings in accordance with the <br /> g <br /> Unified Soil Classification System, monitor soils during drilling for contamination, <br /> collect soil samples, and construct wells <br />' Groundwater Monitoring Well Completion <br /> One groundwater monitoring well will be installed to determine the presence of <br /> ' groundwater contamination resulting from a release from the former underground <br /> tanks The well will be constructed in accordance with the State of California <br /> Department of Water Resources Water Well Standards, Bulletins 74-81 and 74-90, as <br /> well as County of San Joaquin regulations The boring will be drilled to a depth of 15 <br /> feet into the water table, unless a substantial confining layer or dense bedrock is <br /> ' encountered The maximum drill depth is estimated to be 75 feet below surface grade <br /> The wells will be cased with 20 feet of 2 -inch slotted PVC casing and appropriate <br /> filter pack sand, installed from the bottom of the boring to 5 feet above the slotted <br /> interval Blank PVC casing packed in Volclay grout will extend from the surface 4 <br /> downward to the three foot bentonite seal placed alcove the filter pack A locking, <br /> water-tight well cover will be set in concrete to protect and secure the well head <br /> ' ell Development and GroUndwater Sampling <br /> Following completion of the groundwater monitoring well, the well will be developed <br /> ' by surging and bailing to remove drilling residues and produce low turbidity ground <br /> water All development, purging, and sampling equipment will be washed TSP (tri- <br /> sodium phosphate) detergent, rinsed with clean tap water and deionized water, then <br /> allowed to air dry before the well is purged and sampled, to reduce the possibility of <br /> ' cross-contamination Prior to sampling, the groundwater monitoring well will be <br /> purged with a pre-cleaned bailer to remove stagnant water in the well During <br /> purging, key parameters including temperature, conductivity, and pH will be <br /> 9207-EO37 WP <br /> EB-8101-3 <br />