SITE INFORMATION AND CORRESPONDENCE

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FEB 11 194 09:54 TO 1.2094649138 FROM Helmick/Lerner.( Inc. T--499 P.03 r� I f I N I R 3750 Auburn 81 Suite A I �SaGrarriento,,Cq 9 9621 r ENGINEERING AA10 EXVIR0:NMENTA! SERVICES Telephom:(9161 485.7222 FAX: (916)485A098 C.7 ]2 January 1994 Mr, Bill ''Vizza Public Works Director City of Tracy 520 Tracy Boulevard Tracy, California 95376 Subject: Comments by San Joaquin County, PHSZEHD Groundwater Investigation - 301 W. Grantline Tracy, California HLI 10101 Dear Mr.'' Vizza: This letter transmits information requested by San Joaquin County PHSfEHD in.their lever .dated 21 'December 1993. The County .has requested `seven items of information which include- 1) The gradient calculations performed on the data of 190ctober 1993; 2) A corrected Table l showing calculated: water elevations from 19 October 1993; 3) The water level measurements and gradient calculation from 27 October 1993- 41) The'boring log for MW-3 5) The measured distances `between the monitoring wells; 6) The gradient calculations for October 1993,and Decernher 1993; .?) The location of all domestic, agricultural, and municipal'weIls within a 2;040 foot radius of the site. In prior conversations with Mr. Steve Sasson of San Joaquin County, we were advised'that the County desired additional sets of.groundwater'level :measurements be trade_ Since we were in the vicinity of the site on 9 December, we collected a ;set of groundwater level measurements on that date. This information and corrections to the 19 December, information reported are presented in the .attached Table 1. We have provided copies of the graphic solutions used to calculate groundwater flow direction and gradient. The distances between wells are listed below_ MW-1 to MW-3 57 feet MW-1 to MW-2 24 feet MW-2 to MW-3 54 feet i