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MAY 09 '95 04:01PM CLEARWATER GROUP P.2!4 <br /> CLEARWATEr <br /> U R D U n, I N C. <br /> Ms. NIary Meays May 9, 1995 <br /> Senior Lead REHS <br /> San Joaquin County Public Health Services <br /> Environmental Health Department <br /> P.C.box 388 <br /> Stockton,CA. 95201-0388 <br /> Re: Ruiz Grocery Store, 4491 West Durham Ferry Road, Tracy <br /> Dear Ms.Meays, <br /> The purpose of this Ietter is to provide detail associated with proposed modifications . <br /> to -the approved scope of pilot testing work. The following information builds on <br /> our recent conversations, and includes a report of recent field activity, as well as a , <br /> basis'for the proposed modifications. <br /> Results.of Preliminary Testing <br /> Clearwater mobilized to the subject site several weeks ago for the purpose of <br /> completing a well yield test. The purpose of this test was the attainment of <br /> information that would have enabled the selection, of the most appropriate <br /> ,groundwater extraction test pump, as well as information required for the provision <br /> of adequate storage capacity for extracted water storage. The test was to be completed <br /> using an electric submersible pump, with recovered water to be stored in drums. <br /> -Due to the rate of water recharge, the test was actually completed using a hand <br /> bailer. <br /> As I indicated in my transmittal dated May 1, the recently installed recovery well did <br /> not produce a significant quantity of water during our pre-test. I believe that this <br /> observation is.a resuit of a poorly transmissive formation, although a contributing <br /> factor may be a marginalfilter pack. Flowing sands were encountered during well <br /> installation, and the installation of the most appropriate amount of gravel around <br /> the well screen was consequently made more difficult. <br /> 'Clearwater also measured the levels of oxygen in the soil vapor captured by the <br /> vapor extraction. wells (tinder non--extzaction conditions). Observations indicated <br /> that only low levels of oxygen existed under these static, conditions, <br /> 1125 AtMantic Avenue Suite 102 9 A2au*da+Caiifo •94501•(510)337-$730 Fax(510)525.09M <br />