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(916)920-3518 1107 KENNEDY PL.,STE.7,DAVIS,CA 95616 (916)756-2250 T114.881a'' April 19, 1988 � � 4V, .. �` 1G85 Mr. David Carls, SanitarianJ�t'vTAL HEALTH ENVIKu, SERVICES, San Joaquin Local Health District frERM►�� 1601 East Hazelton Stockton, CA 95205 Subject: CITY OF TRACY--SOIL BORINGS AT AND NEAR CORRAL HOLLOW AND BYRON ROADS. Dear Dave: As per our telephone conversation on April 18, 1988, I have written the following regarding the above work. 1. The soil boring at stations 0 + 00 "F" line of the Tracy Water Supply Project has been deleted from the work plan dated April 13, 1988. 2. Soil boring excavated material will be stored on an impervious material and covered until laboratory analysis results are known and management or dispo- sal recommendations can be made to the San Joaquin Local Health District. 3. The existing and proposed bore holes (maximum of six (6)) will be closed and sealed with a 5 percent bentonite/cement slurry to meet the requirements of the San Joaquin Local Health District. San Joaquin Local County Health District staff will be notified 24 hours prior to boring or sealing of bore holes at this site. 4. Groundwater from the north boring pit, "C" line, station 44 + 25, will be discharged to the city of Tracy sewage treatment plant as per the recom- mendations of Mr. David Brent, California Regional Water Quality Control Board, Central Valley Region. It is anticipated that less than 2,000 gallons of groundwater will be pumped from the boring pit. 5. The vertical boring contractor will have a valid C-57 contractor's license and will secure a drilling permit prior to start of work to drill four (4) borings on the "D" line at the Byron Road crossing. 6. All data and reports will be signed by the city of Tracy staff and submitted to the San Joaquin Local Health District within thirty (30) days after approved by the city of Tracy.