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P- .1 <br /> D. K. BARBER . & ASSOCIATES <br /> phonelfaxl(209)623 Camelia 369-0482 Lodi A95242 UA <br /> ������ <br /> Unl <br /> October 11,2000 OCT 1 2000 <br /> Mr Jeffery Wong ENVIRONMENT liEALTH <br /> San Joaquin County Public Health Services PERMIT/SERVICES <br /> Environmental Health Division <br /> 304 E Weber Avenue,Third Floor <br /> Stockton, CA 95202 <br /> Subject ADDENDUM TO WORK PLAN FOR A PHASE II FIELD INVESTIGATION WESTERN OIL <br /> AND SPREADING, 19256 N HIGHWAY 99,ACAMPO,CA <br /> Dear Mr Wong <br /> Enclosed is D K BARBER P E and ASSOCIATES', addendum to two earlier proposed work plans for <br /> the subject site I understand that the earlier plans by Gallardo & Associates (Windsor, CA) and <br /> Klemfelder (Fairfield, CA)were submitted to you in December 1998 and July 2000 respectively <br /> A meeting between Western Oil & Spreading Inc's, representative, Jeff Hopkins, San Joaquin County <br /> Environmental Health Division (EHD) staff and me was held on September 19, 2000 The meeting's <br /> results were memonalized in your letter of September 22,2000, copy attached <br /> Modifications to the Kleinfeider proposal include, <br /> . A Monitonng Well, 2 IN x 60 FT +/- will be installed, developed, purged and sample, aver the <br /> next year on a quarterly basis The monitoring well casing will be 2 IN schedule 40 PVC pipe <br /> with screening similar to Kleinfelder's proposal, in a bored hole, 6 IN to 8 IN diameter <br /> A minimum of 3 additional bonngs utilizing direct push technology (DPT)will be used to define <br /> the lateral extent of soil contamination Additional bonngs may be employed while on site, if <br /> warranted <br /> A boring, anticipated to be down gradient,will extend approximately 50 FT below surface grade <br /> (bsg) to collect a groundwater sample In the event the "shallow aquifer" at 30 FT bgs is <br /> encountered an additional DPT boring may be optioned further down gradient to avoid potential <br /> cross-contamination <br /> D K Barber P E and Associates will forward drilling permit applications for submittal to your agency <br /> along with required fees and necessary signatures by the dulling contractor I understand that EHD may <br /> require several weeks to issue permits I have tentatively scheduled drilling, for the second week of <br /> November 2000 Site personnel will review the site's health and safety plan and USA underground will <br /> be contacted to screen the boring area 48 hours prior to work commencement <br /> Analysis of soil and water will be performed by Sequoia Analytical,a California DOHS certified laboratory <br /> This letter is an addendum to the mentioned Kleinfelder proposal, if additional clanfication is required <br /> please contact me at your earliest convenience at(209) 369-0482 <br /> aTan;210— <br /> Principal <br /> cc w/o attach J Hopkins, Western Oil&Spreading <br />