Laserfiche WebLink
were found to be much finer and less permeable silts and clays that were dense too very dense by <br /> blow count. The concentration of TPHd in sample MW I @25' is less than five percent of the <br /> concentration of TPHd in MW 1 @20'. It would seem very unlikely that a contamination plume will <br /> migrate to the depth of the water table.The monitoring well was installed in the middle of May when <br /> the water table should be at the highest level.The most likely groundwater contamination potential <br /> comes from a raise in the groundwater to higher than twenty-five feet below the surface. This <br /> possibility is very remote. <br /> RECOMMENDATIONS <br /> It is recommended by this author that San Joaquin County Public Health Services issue a letter <br /> directing no further action is required concerning this diesel spill. Monitoring well MW#1 should <br /> be destroyed by the standard approved methods after a letter of no further action required is issued. <br /> The excavations for the UST removals should be backfilled with a one foot compacted layer of acted low <br /> Y p <br /> permeable soil(k= 1 x 10-6 cm/sec)at the base of the backfill.This low permeable soil will prevent <br /> surface water migration though the contaminated plume. The remainder of the backfill may be <br /> random backfill material. <br /> Please contact Ervin Rifenburg of this office (2091368-9381) if any questions arise concerning this <br /> Work Plan. <br /> Respectfully submitted, <br /> Foothi ngi ri <br /> RIFE , <br /> 97 `r ' <br /> Ervin Rife urg, <br /> �OF C� <br /> Enclosures: <br /> 1.Site Map w/Monitoring Well Location <br /> 2.Soil and Water Analysis Recap <br /> 3.Del Tech water sample report <br /> 4.Soil and Water Analysis Lab Reports <br /> i <br /> cc: <br /> Woodbridge Partners Inc. <br /> I <br /> 3 <br /> i <br />