ࡱ> FHE'` bjbj 8<%DDDD8D0,hh"iii$h9 ei  DD ^DR "\ Z>r<h^0ihJ<Wiii^iii    $ DDDDDD  California Regional Water Quality Control Board North Coast Region Interoffice Memorandum TO: File (Gualala CSD, WWTF) FROM: Charles Reed DATE: 9/23/2009 SUBJECT: INSPECTION REPORT - GUALALA CSD WWTF [SEPTEMBER 16, 2009] On September 16, 2009, I conducted a routine inspection of the Gualala Community Services District, Wastewater Treatment Facility. In attendance was Jerry Orth, Chief Operator (Grade III) for the Gualala CSD. The inspection commenced at approximately 9:15 AM and concluded at 12:15 PM. The weather during the inspection was sunny and warm. Collection System I Inspected Lift Station #4. Spill to China Gulch occurred in July 2006 at this lift station. Maintenance, Process Control, Chemical Handling Mr. Orth reported that he will be working on preventive maintenance schedule. I had previously told him that this would be a good idea to track maintenance activities. GCSD has begun monitoring internal process performance through measurements of sludge depth, mixed liquor suspected solids (MLSS) and sludge volume index (SVI). I reviewed daily Operators Log. I noted work done within the collection system (private lateral?) on 2/17/09 in response to SSO at 38651 Pacific Drive. Chemical tracking has improved since last inspection. However, I recommended that GCSD could improve further by tracking chemical receipt date, open date, and expiration date. Unit Processes Aerated Pond Mr. Orth said that the operation of the aerated pond has been recently modified so that aerator nearest the influent line is no longer activated when influent pump is activated. This mode of operation creates an anoxic zone in the basin that provides conditions favorable for denitrification to occur within the pond. Mr. Orth reported that this operation has apparently resolved a problem with rising sludge in the clarifier. Effluent Clarifiers I noted pin floc in the overflow from the weirs and duckweed in center well. (PHOTO) Mr. Orth said that he believed that the duckweed was carried over from the CSA#6 storage ponds and became established in the clarifier. Operations staff installed new safety rails around the clarifier, resolving a serious safety hazard. Traveling Bridge Effluent Filter The traveling bridge for the filter is out of service and under repair. Filter still operating well, manually backwashing the filters. Filter media is periodically cleaned (once/year) with NaOH solution as backwash. Mr. Orth said that he was planning to replace filter media this year. Mr. Orth said that CSA#6 is providing poor quality effluent (TSS between 75-100 mg/L) as a result of algae and duckweed in storage ponds. As a result, GCSD is using more coagulant (injected in a pipe prior to pump at CSA#6) to help with solids removal at GCSD. Disinfection System and Effluent Monitoring GCSD has installed new chlorine residual meters. (PHOTO) At the time of the inspection, residual chlorine in the final effluent was being measured as 1.87 mg/L. Residual chlorine immediately after chlorine injection was being measured at 3.26 mg/L. Mr. Orth says operations staff notes that about 1 mg/L of residual is lost in serpentine contact pipe between the injection point and the point of discharge to the storage pond. I noted to Mr. Orth that the automatic effluent sampler (Sigma 900 Max) did not contain a thermometer to document proper sample preservation temperature. Also, without a thermometer, tracking of daily auto sampler temperature is not possible. Mr. Orth said that be believes that the equipments operation is verified during the auto samplers period maintenance. Maintenance was last done on 8/4/09. The next service is scheduled for 11/09. Mr. Orth explained to me how the turbidimeter (Rosemount Analytical Solu Comp II) works. There are three lamps, one (Clarity II) for measuring the turbidity of water delivered to the effluent filter, the second (Clarity II) to measure final effluent to the storage pond, and a third older model (Rosemount Model T-2120) for measuring the turbidity of the filtrate. The older model is obsolete and will be replaced when it fails. (PHOTO) Effluent Storage and Disposal Pond #1 (7 Mgal) was dry and had been recently scraped to remove vegetation. Pond #2 (6 Mgal) and Pond #3(7 Mgal) were dry. Solids Handling and Disposal Sludge Pump building is new. WAS pumping is on a manual timer. When pumping, rate set at 60 gpm for 4 minutes every 10 minutes. GCSD has PLC equipment for pumps installed by previous operator, but they are not made operational. Mr. Orth says he will get to it one of these days. Sludge drying beds are full. Mr. Orth plans to land apply dried biosolids on site prior to the onset of the rainy season. (PHOTO) Compliance Issues Discussed I spoke with Mr. Orth about violations for exceeding the maximum daily flow of 0.131 mgd that, according to SMRs, have been occurring for the past few years during the summer months. In 2008, high flows were reporting in September 2008 only. Mr. Orth says that use of a larger pump installed at CSA#6 a few years ago is the main cause. He explained that use of this pump is sometimes necessary to quickly drain the CSA#6 storage pond. Normal operation is to use two smaller pumps whose combined maximum flow rate is 45 gpm. The maximum flow rate using the single large pump is 58 gpm. Mr. Orth said that he would minimize the use of the single pump and would pay more attention to the flow limit in the future. After looking at flow records, Mr. Orth said that the high flows in September 2008 were a result of a ductile pipe bypass at CSA#6 used to lower pond levels in preparation for repairs to the pond underdrain. Compliance Concerns No significant compliance concerns. The WWTP appears to operating well.     PAGE  PAGE 3 1DFGKL]^_bcgkv}ylybXKhM hpOJQJ^JhdjOJQJ^Jh tOJQJ^JhM h{sOJQJ^JhM h[UOJQJ^JhM hBl 5OJQJ^JhM hUOJQJ^JhM hBl OJQJ^J#hM hU5CJOJQJ^JaJ#hM hBl 5CJOJQJ^JaJhUhBl 5CJaJ hUhBl hU5CJ hU5CJ hUh @05CJaJ1DEF]^_~A B T  `0x*$gde `0x*$gddj `0*$gdBl  $(a$gdU $ $a$gdU$a$gdBl  * M a   - @ A B T W o ٿ̨̿ٚynhZ25OJQJ^JhM heOJQJ^Jh#BOJQJ^JheOJQJ^Jhehe5OJQJ^JhdYOJQJ^JhM h?OJQJ^JhM hBl OJQJ^JhM hM OJQJ^JhM h[UOJQJ^JhM hpOJQJ^JhM h{sOJQJ^J%T - w x @AU23 `0*$gd2$ `0P*$gddj `0*$gdBl `0v*$gd2$ `0vP*$gdZ2 `0P*$gd, `0x*$gd2$ `0*$gde 1  ' * + - 0 ? 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