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.. , <br /> As shown by the Los Angeles study, swimming pool water contains significant amounts of <br /> chloroform. Splash-out water normally drains to the landscape and soil surrounding a swimming <br /> pool. Since Maurland Manor and the surrounding residences are on private septic systems, <br /> .- back-flush water is discharged to the soil. The possible contribution of periodic back-flushing <br /> as a part of a well maintained pool can be demonstrated by the following scenario for one <br /> swimming pool. <br /> Assumptions made - <br /> a. The swimming pool is well maintained and the filter is back-flushed twice per year. <br /> b. Each back-flush discharges 150 gallons (568 liters) of pool water to the soil. <br /> c. The pool water contains 51.0 µg/L (ppb) of chloroform (from Table 3). <br /> Using these assumptions, a single swimming pool back-flushing twice per year would discharge <br /> 57,916 Itg of chloroform annually to the soil. <br /> These two studies support the hypothesis that swimming pool water is a significant source of <br /> chloroform if the water is discharged to the soil and allowed to migrate to the ground water. <br /> 8. Request 4 <br /> "Provide information to confirm that all residents are using a community water supply." <br /> 9. Response 4 <br /> initial information from the County of San Joaquin Department of Public Works indicated that <br /> all of the residents north of MW-7 were on a chlorinated community water supply. In <br /> subsequent discussions with Mr. Ron Rall, senior county maintenance worker, it appears that <br /> only residents in Maurland Manor are connected to the community well system (there are 28 <br /> parcels paying for water). Other residents north of MW-7 are on private wells. <br /> 10. Request 5 <br /> "Provide information on the location and construction of the community supply wells and data <br /> on chloroform concentrations in these wells." <br /> 11. Response 5 <br /> The community water system for the area consists of three wells designated Maurland Manor <br /> Maintenance District (MD) well, Fairoaks well No. 1 and Fairoaks well No. 2 in Fairoaks CSA <br /> 44. (Note: Fairoaks well No. 1 may be also known as Fairoaks well No. 3.) Location of the <br /> three community wells is shown in Figure 1. <br /> Assessment of Contamination <br /> Addendum to Revised Wort Plan <br /> Triple E Produce Cory.,Tracy <br /> 4 <br /> n <br /> L <br /> NCO- <br /> CONDOR <br />