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386 EAST BEAMER STREET <br /> 4 ' ESRN WOODLAND, CA 95776-6003 <br /> FAX (916) 662-0273 <br /> GEO ENGINEERS (916) 668-5300 <br /> CALIF CONTRACTOR#513857 A CORPORATION <br /> REGISTERED GEOLOGISTS <br /> RECEIVED <br /> MAY <br /> &NY11WNMNTAL MLALTM <br /> Ms. Linda Turkatte, RENS PSMiT/SERVICES May 3 , 1993 <br /> PUBLIC HEALTH SERVICES <br /> San Joaquin County <br /> P.O. Box 2009 <br /> (445 N. San Joaquin Street) <br /> Stockton, California 95201 <br /> (209) 468-0339 <br /> RE: Workplan to destroy thefour existing ground water <br /> monitoring wells; once Site Closure has been granted at Desert <br /> Petroleum Service Station #787, 950 11th Street, Tracy, San <br /> Joaquin County, California, Section 29; T2S; R5E; MDB&M. <br /> INTRODUCTION <br /> Once site closure is granted, the existing onsite monitor wells <br /> should be destroyed, to prevent any risk to the ground water from <br /> the ongoing retail of gasoline at the present service station <br /> facility on site. <br /> Four ground water monitor wells exist at the site . The initial <br /> three wells (MW1, MW2 and MW3) were installed on May 5 and 6, <br /> 1988, to define ground water gradient and monitor any impact to <br /> ground water originating from the underground storage tanks <br /> (USTs) . The fourth well, MW4, was installed on March 11, 1993 . <br /> MW4 was "required" to substantiate that this site could be <br /> considered for closure. All wells were permitted through San <br /> Joaquin County Health. <br /> LOCATION <br /> Former Desert Petroleum Station #787, site code #1401, is located <br /> in Section 29 ; T2S; R5E; MDB&M on the corner of 950 11th Street <br /> and 9th Street, in Tracy, California, as found in Assessor' s book <br /> 231, parcel number 09-02, see Figures 1, 2 and 3 . <br /> MONITOR WELL CONSTRUCTION <br /> The initial three monitoring wells, (MW1, MW2 and MW3) are two <br /> (211 ) inch PVC wells that were installed into 10 inch hollow stem <br /> augered borings, to the 29 foot depth. <br /> Monitor well MW4 is also a 2" PVC well, but was installed into an <br /> 8 inch hollow stem augered boring to the 15 foot depth. <br /> page 1 <br /> E - <br />