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97 FRI 0314 PM Tr <br /> 3164 Gold Camp DrIva <br /> ■� Suite 200 <br /> ■ >♦AtT' Rancho Cordova,CA 95670 <br /> AREnvironmental 916163&20&5 <br /> . Consultants,Inc. FAX'916163&6385 <br /> September 4, 1997 <br /> Ms.Mary Meat's <br /> San Joaquin County Deparanevt of Public Health Services <br /> Enva'01nmenal Health Division <br /> 304 East Weber Avenue <br /> Stockton, California 95201-388 <br /> Subject Addendum to Revised Work Plan for on-Site Assessment <br /> Holz Rubber Compal <br /> 1129 South Sacrmmeno Street <br /> Lodi,California <br /> Delta Project No.D096-090 <br /> Dear Ms.Meat's: <br /> This letter is in response to your telephone conversation this morning with Nft. Eric Hohn regarding the <br /> 1 In said conversation you requested additional information <br /> Proposed activities at the sobject site (Pigate )• <br /> regarding consavcbon details for the proposed ground water monitoring wells,backfill details on the proposed <br /> georobe baungs,and treatment of soil generated during drilling activities. <br /> The following <br /> band auger.and soil vapor p Consultants, Inc.'s Revised <br /> The follloio wing information is provided as an addendum to Delta Envuonmemal <br /> Work Plan for On-site Assessment,dated June 30, 1947. <br /> Ground Water Momtorine Well Construction Details <br /> The six proposed ground water monitorinS wells will be conLstraeted of 2 mch diameter,flush-threaded, <br /> inS een <br /> wells will be screened with 0.020 inch slotted scr <br /> Schedule 40 PVC casing. The movitor <br /> esters mg from approximately 45 to 70 feet below surface grade: (bsg) to allow for seasonal ground <br /> water table fluctuations. The annular space is each well will be filled with a filter pack consisz mg of <br /> No. 3 Lonestar sand from 2 feet above the well screen to the mWomam depth of each well. A 2 foot <br /> thick bentonite transition seal will be placed above the filter pack If ground water is present in the <br /> borehole at the depth of the bentonite seal,the beuomite (Wyo-Ben Fnvirplug nim)will be installed <br /> using a tremue pipe. The annular space above the bentonite seal will be filled with neat cement groat <br /> minced at a ratio of one 94 pound sack of PottLutd smart to between 5 and 10 g�depth of 3s Of 0 feet <br /> water. The neat le <br /> cement groat will be placed in the annulus Wring a Mme Me up <br /> bsg; from 30 feet bsg to the ground surface, the grout will be installed via gravity from the ground <br /> surface. A proposed construction detail for the manitonug wells is included in Enclosure A <br /> The <br /> location of the wells is illastrawd in Figure 2. <br /> Desn6on of Geo robe and Hand AvQer Soil$OrinEs and Soil Vauor Probe BorinEs <br /> Theg eoprobc and hand auger soil borings, and soil vapor probe borings will be backfilled with neat <br /> cement grout vuud at a rano of offi 94-pound sack of Portland cement to 5 to 10 gallons of potable <br /> water. Since the interval to be backfilled is anticipated W be dry and less than 30 feet in depth,the neat <br /> cement grout will be installed via gravity from the ground surface. If ground Water is encountered in a <br /> Providing a Competitne Edge <br />