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3140 Gold Camp Drive, Suite 160 <br /> . Rancho Cordova, CA 95670 <br /> (916) 853-9293 • FAX (916) 853-9297 _ <br /> ENVIRONMENTAL HEALTH DIVISION <br /> 304 E. Weber Ave.Third Floor <br /> September 30, 1999 R O. Box 388, Stockton CA 95201-0388 Project No. 07400178 <br /> Approved <br /> Denied ❑ <br /> Mr. Raymond Greer � go- <br /> Conditions (j�` �� OCT 2 51999 <br /> c/o Mr. Brian Greer Date / G by <br /> 1111 First Street <br /> Escalon CA 95320 MCDII Y?NE 6L E �- 'S! IJC-r&J . ' "w) SO Tido ,$ep}wre: wow <br /> ARS /NSfACCC-V IN 7rW0 Si�-PAP T- e 60MK065, <br /> Z, 6oOK SH6t)kD by NO v&MP9ie 20, A9 0t, 9A <br /> Subject: Addendum to Workplan- Soil Vapor Extraction Well Design -MAN O CTCr 6EP� <br /> 15634 Steinegul Road 311 1ggq aS rt�R <br /> Escalon, CA �KS��HD L6r762 VA7ED <br /> A�l6,lq 49, <br /> Dear Mr. Greer: <br /> This addendum to our Workplan dated August 28, 1999 has been prepared to modify the design <br /> of the Soil Vapor Extraction(SVE)well to be installed, and the subsequent SVE Pilot Test to be <br /> conducted, at 15634 Steinegul Road in Escalon, California. <br /> Boring VEW-1 will be drilled to a depth of approximately 72 feet below ground surface (bgs) at <br /> the location shown on Figure 2 of the Workplan. The boring will be converted to a dual- <br /> completion vapor extraction well with screened intervals from approximately 70-55 feet bgs and <br /> 45-30 feet bgs (See attached figure). A 2-inch-diameter, Schedule 40 PVC well will be <br /> constructed with 0.020-inch slot well screen from approximately 70-55 feet bgs, and blank <br /> casing from 55 feet bgs to the surface. A filter pack consisting of#3 sand will be placed in the <br /> borehole annulus from approximately 72 to 53 feet bgs. A bentonite seal approximately 2 feet <br /> thick will be placed from about 53 to 51 feet bgs and a neat-cement grout seal will be placed <br /> from 51 to 48 feet bgs. <br /> A 4-inch-diameter, Schedule 40 PVC well will be constructed approximately 10 feet above the <br /> top of the 2-inch diameter well screen and around the 2-inch diameter casing. The 4-inch <br /> diameter well will be constructed with 0.020-inch slot well screen from approximately 45-30 feet <br /> bgs, and blank casing from 30 feet bgs to the surface. A filter pack consisting of#3 sand will be <br /> placed in the borehole annulus from approximately 46 to 28 feet bgs. A bentonite seal <br /> approximately 3 feet thick will be placed from about 28 to 25 feet bgs and a neat-cement grout <br /> seal will be placed from 25 feet bgs to the surface. The well will be completed with a locking <br /> cap and flush-mounted, traffic-rated cover. <br /> Geotechnical Engineering - Engineering Geology - Environmental Services ^ Construction Inspection&Testing • Analytical Testing <br />