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Mr. Marty Hartzell Project 8MR6 July20, 2001 Page 2 Evaluation ofhydrauHc bead differences observed between the well pairs will be used to calculate vertical gunboats. As restuddol in the June 27, 2001 letter, an east-west cross-section June MW-7 to CPT-3 has hem constructed showing lithology, depth discrete groundwater concentrations and the proposed annealing well screm intervals. The location ofthe doss-section is shown an Figure 2. Cross-section A-A' is shown on Figure 3. Permitting Monitoring well pemdis will be obtained from the San Joaquin County Department of Health Services, Envlmnmmtal Health Division (SICEIID). be addition, an encroachmnd pound will be obtained been the City ofSlockton for the wells to be located in Shanahan; Street. Access fen wells located an private property will be negotiated with the property owner. Monitoring Well Installation Six groundwater monitoring wells (MW-9 through MW-13) will be installed at the general locations shown on Figure 1. The wells will be installed as well pairs each sousued at riQ t zones identified in the CPT invertigatim Three of the proposed wdls (MW-8, 10 and 12) will be drilled to 90 feet bgs and will he s aremel from 60 to 70 fee[ has. Three of the proposed wells (MW-9, 11 and 13) will be installed to 90f bits and will be screened Gom 80 to 90 fed has. The soil borings will be drilled using 8-inch hollow-stem auger drilling cluipmmt. ALL down- hole drilling and sampling equipment will be steam-cleaned following the completion of the withering. All wmkwill be done in accordance with stipulations of pmnits obtained Eon the SICEIID. Gronedwater mouitorng was will be completed by installing 2-inch diameter, Rush- threaded, Schedule 40 PVC casing with 0.020 inch factory-sloaed sender. AnRMCL12 sand pack, or equivalent, will be placed in the annular space across the entire screened interval, mdwillextmdapproxi ely2f abovethetopoftbesere theweE. A 2 to 3 foot bentonite transition seal will las placed atop the send pack, and a Portland cement seal will extend from the bemonAc transition seal to the ®owd surface. The Portland cement seal will be emplaced by Prude pipe or fl ou9b the tern¢ of the hollow-stem angers in one nrownmrv. =p�wel:i..wovonum.mxomi.m ++'coaPolNTlory ry�wmeo)