WORK PLANS - Laserfiche WebLink

Home Browse Search

23 July 1999 AGE-NC Project No. 99-0628 Page 2 of 5 WSI,each dry well is approximately 42-inches in diameter and was excavated to a depth of 25 feet bsg.A 4-inch PVC casing is located near the center of each excavation and the remaining void space was backfilled with pea grave land river rock. The entire area around the dry well was then covered with approximately 5-inches of concrete. The dry wells were connected to the clarifier by 2-inch PVC piping. In early 1999,the clarifier system failed and was replaced with a sanitary sewer hook-up to the City of Stockton. All excess wastewater, not to exceed 400 gallons per day, is disposed under permit, into the City of Stockton sanitary sewer. 2.2. GROUND WATER DEPTH AND PLOW DIRECTION Based upon the San Joaquin County Flood Control Map Lines of Equal Deph in ff"afer IV ells- 1996. ground water depth in the area of the site is approximately 55 to 60 feet below surface grade. Regional ground water flow direction is east-northeast; however, flow direction and ground water depth can vary seasonally throughout San Joaquin County. 3.0. SCOPE OF WORK The scope of work will include the excavation of three dry wells and the collection and analysis of soil (or sludge) samples. Soil samples will be collected in accordance with the USEPA guidelines referenced in Section 1.0. Disposal well closure activities 'M11 include: • Permitting and pre-field work activities; • Excavation of three dry wells and former drain line; • Soil sample collection and analysis; and • Report preparation. 3.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site assessment permits will be obtained from the PHS-EHD. As required by PHS-EHD permitting, a site specific health and safety plan will be prepared in accordance with Occupational Safet}, and Health Guidance Alan ual for Hazardous fVasle Site .4ctivities (National Institute for Occupational Safety and Health Administration. U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to mobilization, each soil probe location will be clearly marked and AdvancedGeoEn ironmenlal,Inc.