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M e m o r a n d u m CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD • CENTRAL VALLEY REGION 3443 Routier Road Phone: (91 6) 361-5600 Sacramento, CA 95827-3098 ATSS 8-495-5600 TO: Antonia Vorster FROM: Gary A. Reents, P.E. Senior Engineer Project Engineer DATE: SIGNATURE: 25 May 1�EE -,—,T SUBJECT: SOUTHWEST HIDE GROUND WATER INVESTIGATION, SAN JOAQUIN COUNTY (CASE #2664) This memorandum is intended to document the numerous revisions to the Ground Water Monitoring Proposal submitted by Southwest Hide and observations of the field work which has taken place. The original Ground Water Monitoring Proposal (Proposal ) submitted by Southwest Hide was dated 1 December 1987. Comments were supplied by our office on 7 January 1988. A revised Proposal dated January 1938 was received and RWQCB verbal comments were supplied at an 8 March meeting and in writing in an 18 March letter. At the 8 March meeting, Dana Means of Southwest Hide committed to submitting a complete Proposal and time schedule by 8 April 1988. On 11 April , we received a revised Proposal from Moldenhauer Engineering (consul- tants to Southwest Hide) but no time schedule. Comments were discussed with Alex Blackburn of Moldenhauer by telephone on 26 April 1988. On 29 April , a letter from Southwest Hide was received which contained a time schedule, but which also contained a completely new monitoring well proposal . This letter and water level contour maps for the site were discussed at a meeting of the same date. Subse- quently, Moldenhauer submitted another proposal on 3 May, and vet another (consisting of a location map only) on 6 May. The final proposal essentially consisted of installing eight two-inch piezometer/monitoring wells on-site in addition to the three existing, and soil borings around and northwest of the ponds. On 10 May, I visited the site to observe the drilling and well installation activities. Drilling was performed by hollow stem auger with continuous coring. Wells/piezometers are PVC with 0.020" screen, #,3 lonestar (12x2.0) sand, bentonite pellet plug, and cement-bentonite grout. Drilling, logging and construction procedures observed at wells 4 and 5 were all acceptable. While on-site, I discussed the following issues with Moldenhauer, staff and Dana Means of Southwest Hide: 1. A background well is still needed immediately upyrad ent, but outside of any mounding influences , of the ponds . The existing background well is of limited use since it is almost 4000 feet away. All parties agreed; 2. Why the proposed soil boring work was not bei performed while the drilling rig was on-site. Mr. Means responded that Soijthwest wanted to assess the severity of thc, ground vrater oroblem, if any, before conducting add tionai