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AREA MAP SHOWING WELL LOCATIONS: <br /> The enclosed map was constructed from several Assessor parcel maps; the <br /> approximate scale and a 2,000 foot radius circle is shown. An exhaustive search of <br /> the area was made to locate the wells on the DWR list and others not in their system. <br /> A total of 27 wells were identified during this work; we did not attempt to determine <br /> their status. Of the 17 wells on the DWR list, we were able to locate 7 during the <br /> field survey. The remaining 10 were either beyond the zone of influence or could not <br /> be located. Some of the additional 10 wells we spotted may have been on the DWR <br /> list, but the descriptions given were inadequate for locating them. <br /> MASS BALANCE CALCULATIONS: <br /> In order to estimate the volumes removed vs. volumes remaining, the following proce- <br /> dure was followed: <br /> 1. The amounts of TPHg, THPd, & Benzene contained in the soil removed from the <br /> two excavated were calculated using data from the results of the laboratory analyses. <br /> 2. The amounts remaining in the soil.were calculated using laboratory data from the <br /> three monitoring wells and 8 soil probes; existing maps, and assumed thicknesses. <br /> The parameter used for these calculations are: <br /> Soil density - 87 lb./f? <br /> TPHg - 45 ib/ft3 <br /> TPHd - 55 Ib./ft9 <br /> Benzene - 56 lb.lft3 <br /> Based upon the above data and parameters, the results of the work can be <br /> summarized as follows: <br /> TOTAL AMOUNT TOTAL AMOUNT <br /> EXCAVATED REMAINING <br /> TPHg: 268.4 lbs. 5.22 lbs. <br /> TPHd: 115.5lbs.(minimum) 8,82 lbs. <br /> Benzene: 2.90 lbs. 0.06 lbs. <br /> PERCENTAGE REDUCTIONS OF COMPOUNDS: <br /> TPHg - 98.1% <br /> TPHd 92.4% <br /> Benzene - 98,.0% <br /> 2 <br />