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-23-1999 17:04 CAMBRIA 510 420 9170 P.01i02 <br /> To: Ron Rowe FACSIMILE <br /> Organization: San Joaquin County EHS <br /> 304 East Weber Avenue, 3`1 Street TRANSMITTAL <br /> Stockton, California 95201-0388 <br /> j Fax #. (209) 468-3433 <br /> Re: Equive (Shell) Ripon <br /> Ground Water Contour Map, <br /> Pump Test Schedule, and <br /> Report Revisions <br /> Date: Friday, April 23, 1999 <br />'i Pages: 2, including this cover sheet. <br /> Ron: <br /> Ground Water Contour Map: I have attached a ground water elevation contour map based <br /> on Blaine Tech.'s March 11, 1999 site visit and sampling event. Note that well MW-1 was <br /> not used for contouring purposes. The water level in MW-1 is higher than that in the <br /> surrounding wells. The map will be included in the quarterly ground water monitoring report <br /> that will be issued soon. <br /> Pumping Test Schedule: We have scheduled to perform the pumping test on May 4 and <br /> 5, 1999. On May 4, we will mobilize to the site, and perform a step drawdown test on well <br /> EW-1. The test will be composed of at least four separate steps. We will perform a 12-hr <br /> constant rate test on May 5, 1999,also from well EW-1. <br /> Report Revisions: 1 have also attached a revised Figure 2—Geologic Cross Sections-for <br /> the recently-issued Monitoring Well and CPT Investigation Report. The revised figure <br /> corrects the MTBE concentration from sample CPT-12-30W to 27 ug/L. I will also send <br /> copies of the analytical reports that were issued in facsimile form when I receive the original <br /> copies from the lab. <br /> If you require any more information or have any questions,please call me at(510)420-3316. <br /> i <br /> Thank you, <br /> Owen Ratchye <br /> From the desk of... <br /> Owen C.Ratchye <br /> Project Engineer <br /> Cambria Environmental Technology,Inc. <br /> 1144 65th Street,Suite C <br /> Oakland,CA 94608 <br /> (510)420-3316 <br /> Fax:(510)420-9170 <br />