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V_* <br />O <br />0 0 <br />9Betac,4ssociates <br />Consultants in Waste Management, Environmental Control and the Geotechnical Sciences <br />April 23, 1987 <br />Project 116-1.5 <br />Department of Health Services <br />Northern California Section <br />Toxic Substances Control Division <br />4250 Power Inn Road <br />Sacramento, CA 95826 <br />Attention: Ray Leclerc <br />Subject: Permanent Closure of Existing Wells <br />Forward, Inc. Landfill <br />San Joaquin County, California <br />Dear Mr. LeClerc: <br />All existing ground water monitoring wells at the Forward, Inc. Landfill <br />will be permanently closed with cement/bentonite grout. The San Joaquin <br />County Health District requires that the casing be removed, and that a <br />cement/bentonite grout be pumped into the borehole through a tremie pipe. <br />If the casing can not be removed, the entire casing length must be <br />perforated, and the well must be pressure grouted in-place. <br />The following table gives construction details for the existing monitoring <br />wells at the Forward, Inc. Landfill Site: <br />Monitoring Well Construction Details <br />2068 Lincoln Avenue • San Jose, California 95125 9 (408) 978-1514 <br />slotting <br />well <br />slot size <br />interval <br />filter pack <br />depths of clay zones <br /># <br />(inches) <br />(feet) <br />size <br />(feet) <br />----- <br />MW-1 <br />--------- <br />0.063 <br />-------- <br />20-80 <br />------------ <br />pea gravel <br />------------------------------ <br />0-34,45-80 <br />MW -2 <br />0.063 <br />20-95 <br />pea gravel <br />0-10,45-86 <br />MW -7 <br />0.063 <br />10-125 <br />pea gravel <br />0-5,15-30,44-92,97-107,121-125 <br />MW -9 <br />0.063 <br />77-117 <br />pea gravel <br />0-33,39-86,94-121 <br />MW -10 <br />0.020 <br />80-100 <br />#4 aqua sand <br />0-35,37-100 <br />MW -11 <br />0.020 <br />55-90 <br />#4 aqua sand <br />0-40,60-100 <br />MW -12 <br />0.020 <br />80-100 <br />#4 aqua sand <br />0-41,44-100 <br />MW -13 <br />0.020 <br />100-120 <br />#4 aqua sand <br />18-50,57-120 <br />MW -14 <br />0.020 <br />60-100 <br />#4 aqua sand <br />0-60,62-80,90-100 <br />MW -15 <br />0.020 <br />60-100 <br />#4 aqua sand <br />0-87,96-100 <br />MW -16 <br />0.020 <br />70-100 <br />#4 aqua sand <br />0-5,10-24,30-90,95-100 <br />2068 Lincoln Avenue • San Jose, California 95125 9 (408) 978-1514 <br />